KHOA HOC CONG NGHE S U D A DAIMG LOAI V A TO THAIMH THUC V A T CUA CAC TRAIMG T H A I RUIMG T A I D A O COIM CO, T I I M H Q U A I M G TRI Dang Thai Duong'''' TOMTAT He thuc vat dao Con Co bao gom he thu[.]
KHOA HOC CONG NGHE S U D A DAIMG L O A I V A T O THAIMH T H U C V A T C U A CAC TRAIMG T H A I RUIMG T A I D A O COIM CO, T I I M H Q U A I M G T R I Dang Thai Duong' TOMTAT He thuc vat dao Con Co bao gom he thuc vat tu nhien va he thuc vat dugc gay rat da dang; da dieu tra va thong ke dugc 239 loai thuc vat thupc 185 chi, 84 hp, chiem uu the la nganh Ngpc lan voi 227 loai thupc 175 chi, 77 hp Ty trpng giua hai lop cua nganh Ngpc lan la Magnoliopsida/Liliopsida = 6,09/1 Co nhPm dang than, bao gom dang cay" phu sinh, cay go Ion, cay gp trung binh, cay go nho, cay bui, cay day leo than go, cay day leo than co, cay co dung; do, so loai dang cay c6 dimg chiim ty le cao nhat (29,29%), dang cay bui chiim 15,9%, va dang day leo than co chiim 15,06%, it nhat la dang song phu sinh (1,26%) va dang leo than g6 (3,77%) Td cac loai thuc vat c6 su khac biet giua cac trang thai rimg cr cac vi tri khac nhau, mang tinh dac trung rieng cua nh6m, bao gdm: Trang thai rimg ngheo kiet phia Tay, trang thai rimg lib va llla a phia Tay Nam, trang thai rimg kin thuong xanh phuc hdi lib va Ilia b phia Bic, va trang thai rimg tren nen dia hinh doi thap phia Dong va Dong Nam Tir khoa: Da dang loai, td thuc vat, trang thai rimg, dao Con Co LDATVANDE DIo Cdn Cd thupc tinh Quang Tri ed dien tich khoing 2,2 km^, cd tga dd dia ly II 17"08'15"17°10'05" vi Ble, 107''19'50"-107''20'40" kinh D6ng, d c h dlt liln tii 13 - 19 hIi ly Tuy cd dien tich kh6ng ldn, nhung dio lai cd tinh da dang sinh hgc eao, dac biet II da dang vl he thyc vat sy giao luu eiia elc ludng thyc vat dlt liln vl hiln dao Nam 2001, Bg Khoa hpc, C6ng nghe & Moi trudng vl Td chirc Bao ve Thien nhien Qudc t l da eong nhan dao II mot 197 khu hlo tdn thien nhien Viet Nam Nam 2005, dao Cdn Cd dugc dua vIo danh sleh mot 15 khu hlo tdn bien se dugc xay dyng dpc ba bien eua 11 tinh, thinh tren d nude Tuy nhien, cho din nay, van chua cd mot nghien ciin cu thi nIo dugc cong bd vl he thyc vat dio Cdn Cd, tham thyc vat d day tilp tuc chiu nhirng tac dong manh me cua ty nhien vl ngudi Dien tich phan bd ty nhien eua d c loli thyc vat ngly d n g thu hep anh hudng ciia biin ddi hau, kit hgp vdi boat dong phlt trien kinh t l vl ddi sdng cua ngudi dan noi day Chinh vi vay, viec bd sung vl holn chinh d e sd lieu dieu tra ea bin vl d c dang tham thyc vat, dac dilm sinh thii viing II mpt viec llm d p thilt nhlm bao tdn vl phlt triln sy da dang cua he thyc vat bien dao Cdn Cd II PHUONG PHAP NGHIEN CUU Phuong phip thu thap sd lieu tren hien trudng dupe td chirc theo tuyln dilu tra Tuyln dilu tra ~ ~ ~ ^ ^ ^, ~ ~ ^ , TS Truong Dai hpc Nong Lam, Dai hpc Hue 120 dugc thief k l theo dudng trdn ddng tam dya tren dudng ddng mirc vdi tuyln chinh: Tuyen 1: Vdng quanh dao theo dudng rli nhua vdi chilu dii tuyen II km, xem xlt tdng quan he thyc vat dio, xlc dinh nhiing diem mdc, sy khIc biet vl chuyin tilp he thyc vat dio Tuyen 2: Tu" tuyln 1, elt tuyln dilu tra di vIo rimg theo hudng xuyen tam (hudng den dinh 63) Tuyln se bao gdm nhieu tuyln nhd, cae tuyln nho se di theo he thdng dudng giao thdng hlo tren dao Tuyen 3: Tir tuyen 2, xlc dinh d c hudng cd sir khac biet vl chuyen tilp thyc vat tren dio, md tuyen mdi vl tii lap tieu chuln tai vi tri cd sy khIe biet nly miu dieu tra Dilu tra miu dac trung, dien tich tieu chuln II 400 m^ Chi tieu dieu tra: Thinh phln loai (bao gdm ca cay gd ldn, cay tai sinh, eay day leo, eay bui, tham tuoi), sinh d n h , mat do, hien trang tai sinh Chi tieu dinh gii Dinh gil da dang d e Taxon vl sinh d n h III KET QUA NGHIEN CUU VA THAO LUAN Sy da dang cae loai thyc vat tai dao Cdn Cd Sdloii thuc vat tai dio Cdn Cd Kit qui dilu tra ban diu da thdng ke duge 239 loli thyc vat thudc 185 chi, 84 hg, co phan bd tir nhien hoac duge gay trdng tai dao Cdn Cd Mae dii dien tich dilu tra khong ldn (khoang 2,2 km^), nhung sd loli thyc vat d day da dang vl phan bd kh6ng deu NONG NGHIEP VA PHAT TRIEN NONG THON - SO - THANG 4/2010 KHOA HOC CONG NGHE giua cac hg Trong tdng sd 84 hg dilu tra dugc 1,19%) CIc hg cdn lai cd sd loai biin dong tu 3-9 loai, thi da CO din 24 hp (28,57%%) chi cd mot loli, 21 hg chiim 45,24% Day II mot diem dac tnmg ciia da dang (25%) chi cd loli vl hg ed sd loli ldn nhlt II hg Cue sinh hgc nhiet ddi Kit qua bilu thi sy chenh lech vl (Asteraceae) cung kh6ng qua 12 loai (ehilm ty le sd loai giua d c hg dugc thi hien qua hinh sau: D Ho chi CO loai 28,57% a Ho chi CO loai 45,24% D Ho CO 12 loai n Cac ho lai 25% 1,19% Hmh Bieu dd bieu thi su chenh lech ve sd loli giiia d c hg thyc vat tai dao Suphan bdcic taxon thuc vat cic nginh Kit qua thu duge vl sy phan bd d c bac taxon thyc vat cle nglnh duge thi hien qua bang Bang Sy phan bd cle taxon d e nganh thue vat STT Nganh Lycopodiophyta - Thong dlt Polypodiophyta - Duong xi Pinophyta - Thong Magnoliophyta - Ngpc lan Sdho 77 Sd chi Sd loai 175 227 Ty 16 % sd loai 0,84 3,35 0,84 94,97 62 15 84 146 29 185 195 32 239 85,9 14,1 100 Magnoliopsida - Lop Ngpc lan Liliopsida - Lop Loa ken Tong cong Kit qui phan tich 239 loai cay d dia bin nghien ciiu theo dang sdng duge the hien d bing Cd thi nhan thay ngoli da dang vl d c bac taxon, he thyc vat tai dao Cdn Cd cdn rat da dang vl dang sdng Kit qui phan tich cho fhly ed dang sdng dac tnmg eua d e loai thyc vat noi day, dd dang cay ed dung ed nhilu loli nhlt (70 loli, chiim Trong nglnh Nggc lan, d e taxon chu ylu thugc 29,29% tdng sd loai dilu tra dugc) Tilp theo dd II Idp Ngpc lan (Magnoliopsida): 62 hg, 146 chi, vl 195 dang cay bui (38 loai, ehilm 15,90%) vl cay dly leo loli, vdi ty le % sd loli so vdi toan nglnh Nggc lan la thin ed (36 loai, ehilm 15,06%) Ca ba dang sdng nly 85,9% Ty trgng vl sd loli giua Idp Nggc lan va Idp la yeu td the hien dac tinh thich nghi vdi dilu kiln Loa kin la 6,09:1 So vdi cle he thyc vat nhiet ddi sdng kha khac nghiet eua dao Chinh vi sy ban ehl khIc thi ti le d bac loli tuong iing II 3:1 Nhu vay, vl d c loli eay than gd (trong dd hon mdt nira II he thyc vat d day mang tinh dac trung rlt eao cua he nhirng loli cay duge trdng) nen d c dang cay phu thyc vat nhiet ddi sinh vl cay day leo than g6 ehilm mpt ty le rlt nhd Da dang thuc vat theo dang sdng he thyc vat noi nly Kit qua d bang cho thay sy phan bd d c taxon d c nganh thyc vat tai day kh6ng diu Phln ldn cle hp, chi vl loli thyc vat deu tap trung d nganh Ngpc lan, vdi ty le % sd loli len din 94,97% Nglnh Th6ng dlt ehi bao gdm hg, ehi vl loli QuyIn bl (Selaginella spp) NONG NGHIEP VA PHAT TRIEN NONG THON - SO - THANG 4/2010 121 KHOA HOC CONG NGHE 5ang Phan loai thyc vat tai dao Cdn Cd theo dang sdng % tong so So loai Dang song 1,26 Cay phu sinh 9,21 22 Cay g6 Ion 12,13 29 Cay gd trung binh 13,39 32 Cay go nho 15,90 38 Cay bui 3,77 Cay day leo than go 15,06 36 Cay day leo than c6 29,29 70 Cay CO dung 100 239 Tdng sd Td thyc vat cua cae trang thai rimg tai dao Cdn Cd Trang thii rimg ngheo kiet Ila phia Tay Trang thii rung nghIo kiet Ila thudng fhly d mii ddi phia Tay dio vdi dia hinh bing phang, ddc trung binh tir - 8°, trii dii tren dien tich khoing vdi cao tdi da khoing 10 din 15 m so vdi myc nude biin Toln bg hudng phoi eua mii ddi nghieng vl hudng luc dia phia Tay nen tham thyc vat mang nit dac trung eiia vung ehuyin tilp tham thyc vat dat lien dd, Ggi tia dugc phlt hien nhieu nhat, sau dd II Trudng mat vl cac loai cay khIe Nhdm cay than thao co chilu eao din 1,5 m dupe phat hien voi mat cao, che phu ban 90% be mat dlt thugc cac loli Son ciic (Wedelia montana) Gang gai (Randia spinosi), Cd llo (Eupatorium odoratum) Bach bg (Stemona tuberosi) va Sam bdng bdng (Dracaena angustifolii) Nhdm thyc vat day leo (thyc vat ngoai ting) phat triln phong phu vl chung loai vl sd lugng cl the Lgi dung tin rimg thua, che phu ldn nhung ehl dp sing dudi tan ning cao, nhdm thyc vat ngoai ting bao gdm d e loli nhu May (Calamus viminali^, Ray (Alocasia macrorrhiza), Ma (Paederia foetidi) Vac (Cayratia trifolia), Kim cang kh6ng gai (Smilaxglabri), Lau (Psychotria condorensis) phlt triln manh Ben canh dd, d c cl thi tai sinh thugc loli cay uu thi (Diing dinh) cung dugc phlt hien vdi mat eao LI trang thii rimg ngheo kiet phuc hdi cham, d c bien phap tac dong ky thuat lam sinh dugc de nghi cho trang thii rimg nly bao gdm he thdng cai Kit qui dilu tra tren tilu chuan dinh vi cho thien ning kit hgp llm gilu ning vdi elc loli cay ban fhly, td thinh elc loli cay rimg thugc trang thii rimg dia nhu Gu lau, Trudng mat, Ggi tia; ddng thdi bd ngheo kiet Ila phia Tay ngheo nIn Khoang 12 sung them mot sd loli cay nhu Lim xanh loli eay gd nhd vl trung binh Trong sd dd, loli Man (Erythrophoeum fordii), Huynh (Tarrietia javanici), Trim trIng (Canarium albuni) hoac Nang (Alangium chd II to (Knema poilanei) ehilm ti le cao (30% tdng rid ley) sd cl thi dilu tra duge) CIc loli Trudng mat Trang thii rimg lib vi Ilia aphia Tay Nam (Amesiodendron chinense), Ggi tia (Amoora gigantea) Tram (Syzygium spp.) mgc rai rac deu Trang thii rimg lib vl Ilia phia Tay Nam thupc tren toln bd dien tich Dac biet, loli Gy lau (Sindora sudn nui phia Tay Nam dao ehilm dien tich khoang tonkinensis) dugc phlt hien tai khu vyc nly vdi mat 10% tdng dien tich dio thIp nhung phan bd kha diu tren toln bg dien Tham thyc vat b khu vyc nly thugc loai kieu rimg tich Td thinh thyc vat eay than gd nghIo nIn nhung kin thudng xanh Tren d dilu tra djnh vi, tan che lai mang vlt tich eiia ddng thyc vat dat lien ven bien trung binh 85% Loai thuc vat uu the tai dly vIn la thugc d c huyen ven bien tinh Quang Tri nhu HIi Diing dinh, chiem khoang 35% tdng el the tren Lang, Trieu Phong vl Vinh Linh Trang thii rimg kin dang ed khuynh hudng phuc hdi Nhdm eay byi ehilm ti le cao, mgc hdn loli vdi tdt Nhdm d e loli thyc vat ngoai ting giam nhieu d nhdm cay gd nhd; dd ding ke II loli Dung tieu khu nly, thay vao dd, mat eay than gd kich thudc ldn xult hien nhilu Dgc theo d e tuyln am dinh Dimg dinh chiim ti le ldn va phan bd diu dugc tao vlt nirt bazan vl nuf trim tich Neogen, tren toln bg dien tich eua cle tieu chuan Kit qua chudi rimg va d c loli eay ua am khac nhu elc loai thdng ke theo don vi el thi cho thay Dung dinh m6n, rIy che phu toln bp mat dlt voi mat dp cao ehilm ti le 35% td thinh d e loli eay tham gia Nhdm cay gd nhd vl cay go vira ehilm uu the tai d u tnic rimg trang thii rimg nly la Tr6m (25%) hdn giao vdi cac Nhdm d y tai sinh duge phat hiln bao gdm d e loli Chay trung bg (Palaquium annamense), Tnrdng, loli Gpi tia, Trim, Trudng vdi mat thap, tir - Ggi tia, Khao (Machilus thunbergi var condorensii), ely tai sinh trIn mdt dilu tra tai sinh m^; Quao (Stereospermum spp.) vl Mau chd la to 122 NONG NGHIEP VA PHAT TRIEN NONG THON - SO - THANG 4/2010 KHOA HOC CONG NGHE (Knema poilanei) voi ti le thIp, k i t dai tin lien tuc thinh ting uu t h i sinh thai che phu khoang 85% tdng dien tich b l mat Cl biet, quin t h i Mil u (Calophyllum inophy lluni) tap trung timg dam rieng biet, tao timg 16 rimg don uu Mu u Xen lln vdi Mil u, thIm thyc vat dudi tan gdm d c loli ed Cdi xay (Abutilon indicum), va mpt sd loli RIy trIng phlt triln kha manh, che phu ting dlt mat Tuy nhien, cac dam Mu u xult hien kh6ng nhilu vl kh6ng theo quy luat phan bd nhlt dinh nhu Bing biin (Terminalia cata ppa) va Dira dai (Pandanus tectorriu^ Dim thyc vat don tm tap trung nly ed the fhly lap lai vdi quin thi cay Lien diep ding (Hemandia nympheaefolia) va cay Bing vu6ng (Barringtonia asiatica) b trang thai ning chuyen tilp dlt bazan nau tim vl d l san h6 vl vd dc tai m l D6ng vl D6ng Nam eiia dio Ting eay bui vdi chieu eao d i n khoang m bao gdm td thinh chinh vIn la Dung dinh vdi mat cao vl phan bd diu theo cym - e l the Cle trdng dgc khe can, Chudi rimg (Musa acuminata) vl RIy (Alocasia macrorrhiza) che phu kin b l mat dlt Chinh quan hgp nly ban e h l tich eye sy phlt triln ciia thyc vat ngoai ting, day leo vl cd dai nhu thudng thay d trang thii rimg nghIo kiet Ila da m6 t a d tren Ting tham tuoi dudi tin bao gdm eay tii sinh eiia d c loli eay me tang tren nhu: Trudng mat, Ggi tia vl Diing dinh tii sinh vdi mat kha eao, che phii gan kin be mat dat Nhdm thyc vat ngoai tang nhu Kim cang kh6ng gai, day Ma ehi phlt trien vdi mat thap d d c trdng kh6ng dugc che phu Td thinh cay tii sinh dudi tan kh6ng da dang, nhdm loli cay tii sinh dudi tin dugc thdng ke II nhdm cay gd vira, ua bdng giai doan dau vl ira sing giai doan sau nhir Gpi tia, Trudng mat vdi mat eao Cay tii sinh phan bd diu tren toln bg dien tich vdi mat tir 20 - 30 cl the tren dilu tra tai sinh m^ Bien phap lam sinh tac dong thdi gian tdi ddi vdi elc trang thii II tilp tuc khoanh nu6i bao vl, chat nu6i duang md rong tan rimg cho eay tai sinh phlt trien, kit hgp trdng dam cay tai sinh dudi tan d l dilu chinh mang hinh phan bd Do tang dlt k h i dly vl kh6, nhdm eay chiu ban ua sang nen dugc trdng bd sung d d e trdng dudi tin, d c loli eay bui chiu bdng nen duge trdng bd sung nhlm tang kha nang giu nude cho dlt vl d i thien dilu kien dlt dai Trang thii rung kin thudng xanh phuc hdi lib va Ilia a phia Bic Trang thai rimg kin thudng xanh phuc hdi phia Ble phlt triln tren nIn d l me phun trio bazan d sau tir 40 - 140 cm, tren nIn dia hinh k h i bing phIng vdi ddc dudi 8** CIc dai tham thyc vat da dang va phirc tap bit diu the hien dan xen theo chilu eao va khoing each tir dinh ddi din ba biin phia Bic Do dilu kien lap dia cd khuynh hudng chuyen tilp tir dlt bazan vIng dd nang sang dlt bazan vIng dd pha d t thit nhe nen td thinh thyc vat cd t h i duge mo ta thinh nhom nhu sau: Nhdm 1: Td thinh thuc vat trang thii chuyen tiep a sudn ddi phia Nam rimg Td thinh thyc vat d day vIn cdn chiu Inh hudng cua d e trang thii rimg mang tinh luc dia phia Tay CIc loli eay gd nhd va vira dien hinh eua dao nhu, elc loli Miu chd (Knema spp.), Ldng mang (Pterospermum diversifolium), Tr6m, Gpi tia, Quao, penangiani) Trudng, Huynh nuong (Temstroemia xen lln vdi cay byi Dung dinh tao thinh kilu rimg phuc hdi sau tie dong Dac biet, d trang thii rimg nly xuat hien mot sd lugng nhd elc loli cay khIe vdi cle trang thii rimg khIc b dao, nhu Ldng mang xult hien vdi mat vl tan suit trung binh, Qui rimg duge phlt hien rai rac tren toln bg dien tich cua trang thii rung chuyen tiep Nhdm d c loai thude ehi Ficus dugc phlt hien nhieu ban lam cho td thyc vat a day da dang ban Tham thyc vlt dugc chia thinh tang ro ret, tang gd nhd vl vira ehilm tang cao thinh dii lien tuc d cao - m so vdi mat nude bien, dang tinh trang phuc hdi kh6ng ed sy tie dong Cay tii sinh dudi tin kit thinh ting thyc vat thir hai Nhdm c l the eay vl cay non thugc d e loai Trudng mat, Tr6m, Miu chd, Ldng mang tai sinh vdi mat cao (50 - 80 e l the/ dilu tra tai sinh m^) Cay bui chii ylu phd hiln d dao Cdn Cd II Dung dinh dugc phlt hien vdi ting suit thap hon, ehilm ti le td thinh dudi 15% va mat tai sinh tiiap Bin canh eay eon va ely non eua nhdm thyc vat tang tren, Idp thyc vat tham tuoi cdn cd mat cle loai eay than thio xuat hien vdi tin suit ldn nhu Sam bdng bdng (Dracaena angustifohi) Thyc vat ngoai tang it phlt trien vl sd lupng loli nhung tin suit bit gap cao hon bao gdm cle loli May (Calamus viminahs), Ray bd (Pothos repens) NONG NGHIEP VA PHAT TRIEN NONG THON - SO - THANG 4/2010 123 KHOA HOC CONG NGHE Nhdm 2: Td thuc vat ven bien CIc dai thuc vat sinh trudng dac thu cua vung hai dio din dugc thay thi bdi cle dai rimg don uu Bing hiln Bing bien sinh trudng thinh d c dii rung dan un mdt ting vdi ehilu rpng tu' 15 - 50 m phia chan ddi, tren nIn dlt cat pha bing phlng Bing biin dan uu cd chilu cao trung binh tu' - 15 m, dudng kinh than tir 20 - 25 cm tao thinh dai tin lien tyc co che phii tren 90% Dpc theo bd biin, tham Bing biin gilm mat dp dupe thay thi bing dai Dua dai co chilu rdng din 10 m trii dii din m l p nude bien phia Bac Cung nhu Bing bien, dat dai II nhan td chu ylu gay tac dong din hien tugng phan bd cue bg dai thyc vat don uu ciia loli Du'a dai Quin the Dira dai ehilm toln bd dien tich dlt tao thinh dai don uu kh6ng ed loli cay xen ke Dpc theo bd nude, d c loli Tra hiln, Phong ba, Bing nude vl Hep thay t h i din tao thinh dai hep khoing m sit mlp nude Bien phip tie dong ky thuat lam sinh d l xult II tang cudng tia thua vl nuoi duong d c khoanh rimg chuyen tilp nhlm nang eao sd lugng loli cay, tang tinh da dang vung chuyin tilp, ddng thdi d i thien dilu kien nude nglm nhlm hd trg viec phlt trien dien tich dlt canh tic n6ng nghiep Mot sd kholnh dat trdng Idiai thIc thdi gian trudc day cd thi d i tao thinh dlt vudn hoac dlt n6ng nghiep cho cu dan dio Trang thii rimg trdng tren nen dia hinh ddi thap a phia Ddng vi Ddng Nam Dang dia hinh ddi thIp vl ddc hudng D6ng vl Dong Nam tap tmng din d khu vyc ddi 63 gin trung tam dio Day II khu vyc dlt Idil ddc nhung lai tao d c dai bdi tu cat san h6 doe bd bien Inh hudng eiia gid biin tir hudng D6ng Dai thIm ven hiln cd b l mat k h i bing phlng tao d c bai d t san h6 ldn Nin dlt chinh II da san h6 Xen lln vd dc klo thinh dai dii khoing 2,5 km dgc bd bien tir mep bd Ble cua dio (Bai Huong Giang) den h i t Bin Nghi Tham thyc vat ty nhien a day cd thi dugc chia thinh nhdm chinh: Nhdm 1: Thirc vat trang thii rimg nghIo lib phat triln tren dat bazan nau tim II trang thii rimg hai ting vdi tang cao dugc kit d u dai tan liln tuc d cao 10 m bdi td thinh d c loli cay Ggi, Quao, Slu, Miu chd, Tru'dng mat, Huynh nuong, Cui bien 124 Nhom 2: Trang thai tham thyc vat Ilia phlt triln tren dlt chuyin tilp bazan nau tim, da san h6 vl vd dc tao sy phan bd eua nhdm thyc vat dac biet tai me dio phia Dong vl D6ng Nam Nhdm cay dac thii vung hIi dio nhu Bang vu6ng Lien diep ding sinh trudng thinh dam voi mat dp kha eao vl tap trung tao thinh cac dim rimg don uu timg loai cay Nhdm 3: Trang thai tham thyc vat lib phlt trien tren dl san h6 va vd dc ven hiln tao dac thii rieng cho nhdm cay vung biin nhilu gid v l man Tra biin, Bing nude Hip, vl Phong ba mpc hdn loai tao thinh thIm cay bui cd ehilu cao duoi m Ngoli d c loli tren, Tu' bi bien (Vitex rotundifoha) dugc phlt hien thinh dim mgc rieng 11 tren d e vung kh6 ban hon Trang thii ning trdng Keo II trim chiim dien tich khoing trdng nam 1995 vl Mudng den (Cassia sianiei) Sau 10 nam, chat lugng rung trdng cho kit qua phii xanh k h i tdt, tilu hau vl tilu sinh thai rimg dugc kiln tao vdi tham thyc vat dudi tin gdm d c loli day leo, Ngu sic, Bg chd, Bg may vl mon rIy Dac biet, Ray trang phlt trien rlt manh, dly dac vl eay eao to, ed cay cao m Tdm lai, tham thyc vat phia D6ng va D6ng Nam dao diln hiln phirc tap vl t h i hien tinh tuong thich vdi dilu kien lap dia dac biet ciia dao Ba tham thuc vat cd d u tnic td thinh holn toln khIc phat triln tren dang dat khIe t h i hien tinh dac thii nly M l phia D6ng va D6ng Nam dao cd kit clu dia hinh ddc tren 20°, sau dd thoai din theo d c bai cit san h6 gay hien tugng xdi mdn manh Viec tii Ididi phuc vl md rpng elc quin the dac biet cua hIi dao la d n thilt Khoanh nu6i ed tie dong II bien phip lam sinh dugc de nghi thyc hien CIc loli cly Lien diep ding, Bing vu6ng Hip, Phong ba vl Tra bien da duge thir nghiem gieo tao cay eon va uom hom thinh e6ng d dat liln Viec phat trien khoi phuc cle nhdm thyc vat II kha thi Bin canh dd, kh6i phuc canh quan rung dudi tin Keo la trim II c6ng viec cin thilt Nhdm d e loli eay ban dia nen dugc trdng thir nghiem d l lam gilu rung vl kli6i phuc d n h quan IV KET LUAN VA KIEN NGH| Kit luan Kit qui dilu tra da thdng ke dugc 239 loai thyc vat thugc 185 chi, 84 ho, co phan bd tir nhiln hoac dugc gay trdng tai dao Cdn Cd Phln ldn d c hp, chi v^ ) d i thyc vat diu tap trung a nganh Nggc lan, vdi ty le % sd loli len din 94,97% Ty trgng ve sd NONG NGHIEP VA PHAT TRIEN NONG THON - SO - THANG / KHOA HOC CONG NGHE loli giua lop Ngpc lan vl lop Loa kin nglnh Ngpc lan la 6,09:1 Trong sd dang sdng dac trung eiia cac loai thyc vat noi day, dang cay cd dung co sd loai ehilm 29,29% tdng sd loai dilu tra, tilp sau la dang cay bui (15,90%) va dang eay day leo than ed (15,06%) Dang cay phu sinh ehilm ty le thIp nhat (1,26%) Td thinh d c loli thyc vat cd sy khIe biet giua d c trang thii rung d d c vi tri khac Trang thii rimg nghIo kiet Ila phia Tay mang dac trung cua vung chuyin tiep thIm thyc vat dlt liln Trang thii rimg lib vl Ilia d phia Tay Nam thugc loai kieu rimg kin thudng xanh vdi mat eay than gd kich thuac ldn xult hien k h i nhilu Trang thai rimg kin thudng xanh phye hdi lib vl Ilia d phia Bac thupc loai kilu rimg kin thudng xanh voi hai nhdm td thyc vat bao gdm: Nhdm td thinh thyc vat trang thii rimg chuyin tilp d sudn ddi phia Nam chiu Inh hudng eua d c trang thai rimg mang tinh luc dia phia Tay; nhdm td thinh thyc vat ven hiln vdi d c dai ning don uu Bing biin vl Du'a dai Trang thii rung trdng tren nIn dia hinh ddi thap d phia Dong vl D6ng Nam vdi ba nhdm tham thyc vat ty nhien ed d u tnic td thinh holn toln khIc phlt triln tren dang dlt khIc thi hien tinh tuong thich vdi dilu kien lap dia dac biet cua dao Trang thii ning trdng Keo la trim vl Mudng den cho kit qua phu xanh k h i tdt, tieu hau vl tieu sinh thii rimg dugc d i thien ro ret Pham HoIng Hg (2000) Caycd Viet Nam tap NXB tre, HI Ngi Kiln nghi Cin tilp tuc dilu tra nhlm bd sung them danh luc cle loli thyc vat ed phan bd ty nhien vl dupe gay Trung tam Tii nguyen va M6i trudng, Dai hgc Qudc gia Ha Ngi (2001) Danh luc cic loii thuc vit Viet Nam tap NXB N6ng nghiep, HI Ngi trdng tren dio Thir nghiem d c giii phip ky thuat lam sinh da dugc kiln nghi sir dyng phu hgp voi timg trang thii rimg ^ TAI UEU THAM KHAO Nguyin Tiln Ban- Chu bien (2003) Danh luc cic loii thuc vat Viet Nam tap NXB N6ng nghiep, HI Ngi Nguyin Tiln Ban - Chii bien (2005) Danh luc cic loii thuc vat Viet Nam tap NXB Nong nghiep, HI Ngi Vo Van Chi, TrIn Hgp (2002) Cayed cd ich a Viet Nam NXB Gilo dye, HI Ngi Cue thdng ke QuIng Tri (2007) Nien giim thdng ke tinh Quing Tri 2006 NXB thdng ke HI Ngi, 7/2007.100 tr Nguyin Huy Dung (2005) Tii nguyen rimg d-en nui di vdi vi van de quin ly Trich xult tii: Khoa hgc e6ng nghe N6ng nghiep vl phlt hiln n6ng thon 20 nam ddi mdi NXB Chinh Tri Qudc Gia Tr: 106-107 Pham HoIng Hg (2000) Caycd Viet Nam tap NXB tre, HI Ngi Pham HoIng Hd (2000) Caycd Viet Nam tap L NXB tre, HI Ngi THE DIVERSITY OF PLANTS AND THE PLANT SPECIES COMPOSITION OF F O R E ^ T Y P E S IN CON CO ISLAND, QUANG TRI PROVINCE Dang Thai Duong Summary The Con Co island flora, including wild flora and cultivated flora, has been very diverse According to preliminary surveys, 239 plant species belonging to 84 families and 185 genera have been already identified, of which the Magnoliophyta predominates with 227 species belonging to 77 faminies and 175 genera The species ratio between Magnoliopsida and Liliopsida is 6.09/1 There are stem forms including epiphytic plant, big tree, average tree, small tree, bush tree, woody climber, climbing herbaceous, and standing herbaceous groups, of which the standing herbaceous groups occupy the highest number of species (29.29%), the bush tree groups occupy 15.29%, and the climbing herbaceous groups occupy 15.06%; the epiphytic plant woody climber groups occupy the lowest ratio, corresponding with 1.26% and 3.77% The plant species composition is different between the forest types in different locations and has the own characteristics, including: the poor forest on the west of island; the forest type lib and Ilia on the southwest of island; the forest type lib and Ilia on the north of island; and the cultivated forest on the lower terrain in the east and southeast Keywords: Diversity of species, forest composition Con Co island Ngudi tham dinh: PGS.TS Tran Minh Hgi NONG NGHIEP VA PHAT TRIEN NONG THON - 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