KHOA HOC CdNG NGHE VPHAIV LOAI TIEM IVAIVG PHUC HQI RUIVG TREIXI DAT SAU CAIVH TAC IVUOIVG R A Y TAI LUU VUC SOIVG CAU, TilVH B A C KAIV Phgm van DilnS Nguyin Thi Thu Holn^ T6MTAT Nghien ciiu da danh gia va phan loai tilm n3ng phuc hdi rung tren dat sau canh tac nuong riy tgi luu vuc song Cau, tinh Bic Kan Tilm nang phuc hdi rimg dupc de cap gom: (i) tilm nang ve da dang loai cay tai sinh, (ii) tilm nang v^ sd lupng va kich thudc cay tai sinh, Oii) thdi gian phuc hli rimg can thilt bing dudng tu nhien de dap iingti6uchi dupc cong nhan rung Kit qua nghien cuu cho thay,tinhda dang loai cay gO tai sinh chua cao, c6 su khac bi&t ve nhom o tieu chuan giua hai thoi diem dieu tra (nam 2011 va 2013), cac loai cay tai sinh dupc chia nhom, m5i nhom cd tii 18 den 28 loai Mat dp va chieu cao binb quan ciia cay tai sinh co triln vong c6 lien he chat vdi td hop cdc nhan td cua di^u kien thd nhuong, thdi gian canh tac nuong riy va fhdi gian phuc hdirimg.Chi sl "fhdi gian phuc hoirimgcan thiet dl dap lingtieuchi cong nhan rimg - n^ji" da duoc sii dung de phan loai tilm nang phuc hdi ning vi no la chi sd c6 tinh tdng hop cao nhit Tiem nang phuc bdi ning tren dit sau canh tac nuong riy da duoc phan loai nhom, tuong ting voi giai phap ky thuat phuc hoi rimg khac (kiioanh nudi bao ve, khoanh nudi xiic tiln tai sinh tii nbi6n,frdngning mdi) Vifec phan loai khong chi diim bao co sd khoa hgc, ma c6n co trien vpng ap dung vao thuc tiln san xuat nhd cac bang tra co tinh dinh lugng cao Tiikhda: Dit sau canh tac nuang riy, luu vucsQngCau,tidmnSng phuc hSi rdng, tinh Bac Kan I.DillTVAUD^ Phan Ioai tilm nang phuc hdi ning frIn dat sau canh tac nuong ray (CTNR) la mot hogt ddng quan frpng va c6 i nghia Ion ddi vdi san xult lam nghiep Vi6c phan logi nly khdng chi giiip Iam rd tilm nang vl da dang loli cay gd hay mdt dac tnmg nao dd vl clu tnie hoac sinh tnrdng (nhu mat dp va chilu cao cua cay phuc hdi), m l cdn giiip cho vide xic dinh thdi gian can thilt de phuc hdi rung cho tiing ddi tupng cu fhi Kit qui phan Ioai la co sd cho vi6c xic dinh gili phap ky thuat tac ddng phii hpp, nhlm nit ngan thdi gian thinh rung vl tiet Idem chi phi thdng qua vi^c lpi dung tdi da tilm nang tli smh tu nhidn ciia Idp phii thuc vat ning frdn tung khu dat nhit dinh (Vu Tiln Hmh vl Pham Van Dien, 2006) Ddi vdi Itm vuc sdng Clu, tinh Bac Kan, nhu clu phuc hdi rfeig 11 rat d p bach, vi noi day cd nhieu diln tich dit khdng cd ning vl fhudc vimg phdng hd diu ngudn Chl tinh riing d ba xa Cao Ky, Ndng Ha huydn Chp Mdi) vl Ra Bin - huyen Chp Ddn, diln tich dit khdng cd rimg nam 2011 da ldn den 2471,3 ha, dd frdn 85% diln tich nly 11 dit sau canh tac nuong riy (Sd Ndng nghidp va Phat hien ndng thdn tmh Bic Kan, 2011) Tuy nhiln, nhOng nghien ciiu vl ddi tupng cdn rlt hgn che, chtra lam rd Tmdng Diii hgc Lim nghiep ^ Tnrdng Dai hgc Ndng lam Thdi NguySn tilm nang phuc hdi rimg, nhu tilm nang ve da dang loai cay gd tai smh, tilm nang vl sd lupng ca thi cay gd, tiem nang ve kich thudc cay xet tii ti6u chuan cdng nhan rimg ciia Nha nudc (Quylt dinh sd 46/2007/QD-BNN) Dac biet chua xic dinh vl phan loai dupc thdi gian phuc hdi rimg cln thilt dl dip ling tieu chi rimg cho timg Id dat bat ky sau CTNR Bdii TuqniG, nidi DUMG VA PHume PHAP lUGHfiu cDu 2.1 Ddi hrpng Ddi tuang nghidn ciiu la tilm nang phuc hoi rimg fr6n dat sau CTNR tgi huy6n Chp Mdi vl huyen Chp Ddn thudc luu vuc sdng Clu, tinh Bic Kan Dat sau CTNR vdi thdi gian canh tie tii din nam vl thdi gian phuc hdi rimg (tinh tii kit fhiic CTNR din tiidi diem dieu fra Ian vio nam 2013 bien ddng -11 nam) 2.2 N$i dung - Dinh gil va phan loai tiem nang phuc hdi vl tinh da dgng loai cay gd; - Dinh gia va phan Ioai tilm nang phuc hdi vl s6 Iuang va kich thudc cay gd; - Phan Ioai tilm nang phuc hdi ning fren dif sau CTNR 2.3 Phuong phip nghiin ciiu Tiem nang phuc hdi rimg frIn dit sau canh tie ntrong riy dupc phan Inh thdng qua cic chi sd: tinh NONG NGHlfP VA PHAT TRIEN NONG THON - KY - THANG 1/2015 123 KHOA HOC C O N G N G H £ da dang loli cay gd, sd lupng va kich thudc cay tli sinh cd trien vpng, thod gian phuc hdi can thilt de dip ling tieu chi dupc cong nhan rimg (Quyet dinh sd 46/2007/QD-BNN) De danh gia vl phan logi nhiing tilm nang nly, cdng tiinh da bd tiri 36 d tilu chuln (OTC) bin dinh vi dai diln cho frang thai tham fhuc vat phuc hdi frIn dat sau CTNR (3 trang thli: dit frang cd, dit cay bui, dif cd cay gd tli smh - theo Thdng tu vl tieu chi xic dmh va phan Iogi rimg sd 34/2009/TT-BNNPTNT), theo cap dp ddc (15-25 dp, 2&-35 dp, > 35 do) vdi 12 OTC/clp dp ddc va theo vi tri fren strdn ddc (sudn chan, strdn giiia, sudn dmh) Ridng frang thai daf cd cay gd tli smh da chii y them tdi ngudn gdc ciia nuong riy (tii ning gd va tii rimg gd mia) Phan bd OTC fheo cac xa nhu sau: xa Ndng Hg (15 d), xa Cao Ky (12 d), xa Ra Ban (9 d) Diln tich mdi OTC la 400 m^ (20 m X 20 m) CIc OTC dupc dinh dau ngoai hi6n trudng Ihdng qua he thdng cot mdc gdm cdt dat gdc cua d Phan cdt frdn mat dat cao 0,5 m dupc ghi rd sd hi6u OTC vl hudng xic dinh cic gdc cdn Iai Tr6n mdi d tidu chuan da thief lap d fhii cap, d d gdc va d d giua Mdi d thii cap cd dien tich 25 m^ Tdng sd cd 180 d thii cap da dupc thilt lap Tai mdi d thli cap da xic dinh d dang ban dl phuc vu cho viec dieu fra thd nhudng Trin mli d tini d p da dieu fra cic chi tieu d n thief cua cay fli sinh (t6n loai, ngudn gdc, phim chit, chilu cao) Cay tai smh dupc dieu fra tiianh Ian, Ian vio diu nam 2011 va lln vao cudi nam 2013, nen k^ gian cich giiia hai lln dupc xic dinh 113 nam Cac chl tieu ve dia hmh (dp doc, hudng phai), thd nhudng (dd day ting dit, ty frpng, dung frpng dat) dupfC dilu fra theo phuong phip thdng dung frong dilu fra Iam hpc Lay mlu dat theo ting: - 20 cm, 20 - 40 cm cho din hit dp sau fang dat Cle chi tidu: ngudn gdc nuong riy, sd nam canh tac nuong riy (A_CTNI9, sd nam phuc hdi rimg (A_PHR_13) dupc xac dinh bang phupng phip phdng vln chu nuong riy (chu ning) Tilm nang da dang Ioai d y gd tli sinh dupc bieu tili thdng qua chi sd, gdm: sd Ioai (S), sd cay tai smh fren d tieu chuln (N), chi sd da dgng Margalef (d), chi sd ddng diu Pielou QO, chi sd Shannon (HO v l chi sd Shimpson (l-Lambda") Vile xic dinh nhiing chi sd da dang loai ciing nhu vile phan loai chiing, phan logi OTC theo tiem nSng da dang loli vl phan nhdm loli cay gd tai sinh dupc thuc hien nhd phln mim R vi Primer Sd Iupng v l kich thudc cSy gd dupc xac djnh gdm: mat dd cay tai sinh cd triln vpng frong d c nSm 2011 (NTS_2_11, cay/ha), nSm 2013 (NTS_2_13, cay/ha), mat dd cay fli sinh cd chilu cao tii m frd Idn nam 2011 (NTS_3_11, dy/ha) vl nam 2013 (NTS_3_13, cay/ha), chieu cao bmh quan cua cay tai smh cd trien vpng frong nam 2011 va 2013 (HTS_2_11 vl HST_2_13, m), chieu cao bmh quan cua nhiing cay tai sinh tir m frd Ien frong nam 2011 vl 2013 (HTS_3_11, vl HST_3_13, m), cac fri sd fang tnrdng binh quan chung ve mat dd v l chilu cao, dtrpc xac dinh bing phan mim Excel Cac ham tuong quan vl nhiing chi sd thdng kl danh gia phuang trinh tuang quan giiia mat dp vl chilu cao binh quan cua cay tai sinh vdi nhiing nhin td cd anh huong quan frpng duoc xic dmh bang phln mim R Thdng qua fhu nghi6m nhilu dang ham tuong quan, da lua chpn dang him: NTS_2_13 = al + bl.Z (1) HTS_2_13 = a2 + b2.Z (2) Trong dd, Z la chi tilu tdng hpp, Z= (SD.P).A_PHR_13/A_CTNR (3) al, bl, a2, b2 Iln Iuat la cic tham sd cua phuong tirinh tuong quan (1) va (2) Tilm nang phuc hdi riing dupc phan Iogi dya frIn chi sd "Sd nam phuc hdi ning can thilt de dip ling ti6u chi dupc cdng nhgn thinh rimg" Theo ti6u chi nly, rimg phdng ho diu ngudn dupc cdng n h ^ fhlnh rimg tiida man ddng thdi hai dilu kien: (0 sd cay tli smh cd tiiln vpng dat tii 400 cay/ha frd l6n va (ii) chilu cao bmh quan cua cay fai smh cd tiiln vpng dat m frd len Can cii vio dgng phuang hinh (1) vl (2), da xac dinh dupc: - Sd nam phuc hdi rirng can tiiilt tinh fheo mat dp cay tli smh (na_u, nam): 400-al n^> W A_CTNR ' SD.P (4j - Sd nam phuc hdi rimg d n tiiiet tinh tiieo chilu cao binh quan cay tai smh {n^ji, nam): - a A_CTNR bl SD.P (5) N N G NGHIEP VA PHAT TRiEN NONG THON - KV - THANC i /2015 KHOA HOC CONG NGHE Dilu kiln: A_CTNR > 0, tiic II chi ap dung cho ddi tupng dit sau canh tic nuong riy Can Cli vao sd nam phuc hdi rimg cln thilt tien h^mh phan logi tiem nang phuc hdi ning thinh d c nhdm va xay dung cac bang fra KFT QUA NGHBV Clhl 3.1 Tilm nSng da dang loli d y gd phuc hoi h^n dit sau canh tic nuong ray Tilm nang da dgng loai cay gd tli smh dupc bieu fhi qua chi sd d bang Can cii vio tri sd bmh quan dia nhung chl sd nly cd tiie nhgn xet rang, tinh da dang loii ciy gd tai sinh akhu vuc ehua cao bang vl sd Iupng ca the gifta d c loli khic - Iai giara Dieu ciing cho thay, thdi gian phuc hdi rimg da Iam tang sd Iuang loli cay gd tli sinh va su gia tang ciia H' chgm ban so vdi su gia tang cua Log(S) Dilu dac bilt la, he sd bien ddng cua cac chl sd da dang Ioai hiln ddi ngupc chieu vdi su bien ddi ciia cac tii sd binh quan cua chiing Neu fri sd buih quan tang theo fhdi gian, h6 sd biln ddng se giam va nguoc lai Tn sd cue tilu va cue dai ciia chi sd (S, N, H', l-Lambda") deu tang hogc dn dinh theo sd nam phuc hdi Ri6ng fri sd cue tieu ciia J' giam theo nam, cdn Co chi sd ddu tang fir nam 2011 den nam 2013 tri sd cue dgi cua nd Iai dn dinh Dilu thdng nhif Sir gia fang cua nhimg chi sd nly phan anh tinh da vdi su bien ddng chung ciia cac fri sd binh quan, dang ve loli ciia cay gd tli sinh dupc fang lln theo phan anh J' giam mdt chiit tir nam 2011 din nam fhdi gian phuc hdi rimg, Rieng chi sd J' - phln anh su 2013 Bing CIc chl sd da dang loai d y gd tli sinh l-Lambda' N d H' S CIc chi sd Nam J' 0,82 7,58 0,94 1,56 19,64 2,35 2011 Tri sd binh quan 1,90 0,89 9,47 0,93 2013 24,47 2,80 CTB) + + + + + Tang/Giam 0,87 0,27 5,40 16,41 1,19 0,04 2011 Sai tilu chuan 5,02 0,99 0,04 0,66 0,07 2013 17,70 (S) + Tang/Giam 71,14 83,56 50,54 4,44 55,78 32,62 2011 Hd sd biln dpng 53,03 35,28 4,61 72,34 34,61 7,80 2013 (S96) + Tang/Giam 0,82 0 0 2011 0,67 0,72 0,00 0,81 Tri s6 2013 + + + + Tang/Giam 4,62 1,00 2,68 1,00 46 17 2011 4,30 1,00 2,69 1,00 52 Tri so max 18 2013 + + 0 + Tang/Giam Van dl dat la sau thdi gian phuc hdi khic dilm khac (nam 2011 vl 2013) Dilu diing (chinh lenh nam), d c chi sd da dang Ioai cd bien d moi miic dp tirang ddng (20, 60,80 va 100%) Tuy nhi6n, neu can cii ddng thdi vio chi sd da ddng rd rlt khdng vl su phan nhdm d c Id rimg theo tilm nang da dang loli cd su thay ddi khdng? De giai dang Ioai dl phan Ioai d tilu chuan thi cd su khic quylt vln dl nay, nghien ciiu nly da danh gia thdng biet ve phan nhom d giua hai thdi dilm dilu fra (nam qua "miic dp tuong ddng" ciia d c chi sd da dang loli, 2011 va 2013) Ching han, OTC sd va sd holn tiln hanh phln loai chi sd da dgng Ioai (hinh la) vl toln khac bilt vao nam 2011 (vdi miic dp tuong phln logi OTC theo tiem nang da dang loai (hinh lb) dong la 0%), din nam 2013, miic dp tuong ddng giua Can Cli hmh la cd the dua hai nhgn xet Mdt OTC da dat 15%, tiic II ngly cang it khac biet II, vdi mirc tuong ddng Ian lupt la 20, 60, 80 va xap xi Nam 2011, vdi miic tiiong ddng khoang 85%, chi cd 100%, se cd sd nhdm I I (6 chi sd), (6 chi sd), (2 nhdm vdi tdng sd 29 OTC Den nam 2013, cung vdi chi sd) vl (2 chi sd) Hai II, khdng cd su khac bief miic hrong ddng nay, da cd tdi nhdm vdi 33 OTC, vl su phln nhdm d c chi sd da dang loli d hai thdi hic la ngly cang khic bilt - NONG NGHIEP VA PHAT TRIEN NONG THON - KY - THANG /2015 125 KHOA HOC C O N G ^ Qnuftmp HKI Sir&BlMlsI a NGHi Gnvmage M 111 j" EO SO ! SiQte '_l 2013 2011 Hinh la Phan log! chi sd da dang loli Graupawige lOUfattage RonNniSIIEniOitiiigiMI 20 1*1 1 E m HI ID 60M ™1 n r l rVi r h - , r ^ n ^ n i S>|la al^= 60- -rp,rSrrPi rfrTPi r'Pi-i I-TYI r V i r-V^ fl 100 2011 sne 2013 Hinh lb Phto lo9i OTC theo tilm ntog da dang loM M6t v ^ de nOa 1^, cay tai sinh xuat hi^n khac - Nh6m 2: PCI > v4 PC2 < ca v^ phan loai va s6 luang ca the tren - Nhom 3: PCI < va PC2 >0 cac OTC, n^n co thi phan loai chung t h ^ h nhting - Nhom 4: PCI < va PC2 < nh6m nao? Dl giai quylt van dl nay, can cii vjio tri Vi6c phan chia loM diia trin ky thuSt phta tich so PCI v^ PC2, nghien ciiu da phan chia cac loai PCA (b^g 2) la mlt nhiing ca sa khoa hoc cho nh6m, do: viec lira chon loai cay phoi hop xiic tien tai sinh - Nhom 1: PCI > va PC2 > noi chung va phiic hoi riing noi chung a khu vtrc Bang Phto nh6m loM cfly K& tAi sinh PC2 PCI Nhom SlloSi Tin loai 0-0,041 126 0,003-0,473 (-0,284) - (-0,003) (-0,026-(0,001) 0,001-0,073 Chl cing, De do, Dung la nho, Duong, Gie gai, Mau cho, Me co ke, Mo la tron, Nhgc, Niic nac, Phan ma, Soi phang Son ta, Thimg muc trau, Thimg muc ma, Tong du, Xoan ta, Xuong ca Ba bit tring Bo dl, Buoi bung, Dpc, Dom, Hu day, Ke duoi dong, Lim xet Long Btog, Long mang, mtog tang, Muong trang, Ngit, Nhto rimg, tit rimg, Sau sau, Soi tia May than giang, Thanh nganh, Thau tau, ThM ba, Trau, Vtog anh Vli thulc Ba soi Chin, Com la kim, Cim tdng, Gli trang, Hooc quang, Khao nhit La nln, mto dia, Me ••img Mo ling Mo roi Quit line Stop, gA, NONG NSHliP VA PHAT TRIEN N N G THON - Kt - THANG 1/2015 KHOA HOC CONG NGHE 28 (-0,168) - (-0,644) - (-0,004) 3.2 Tilm nang phuc hdi vl sd luong vl kich thudc d y go tli sinh trin dit sau canh tic nuong riy huong, Sdi xanh, rd, Nanh chudt, Chan chim, Vang tam, Vang tning Ba bet, Bdi ldi, Biia, Chan, Cheo tia, Dim bdp, Dang, Dang 8II, De gai, De Xanh, Dd ngpn Dung giay, Khao la dai, Khao vang, Mai tap, Mgy mi May tau May thin Md, Mudng, Phay simg, Phdi bd Re, Sdi gai, Sui, Tram frang, Vang, Xoan nhii ring, sd nam canh tac nuong riy bmh quan II 7,5 nam, dao ddng tii den nam Sd nam phuc hdi ning sau kit thiic canh tie nuong riy dao ddng hi den 12 nam, binh quan la 8,4 nam Can cii vao bang cung nhan thay cd su dao ddng Idn vl mat dd va chieu cao ciia cay gd fai shih co friln vpng, lan lupt la - 880 cay/ha va - 4,5 m Tri sd trung bmh vl mat dp va chilu cao ciia cay tli sinh cd triln vong cung nhu sai tilu chuan (STC), he so biln ddng (S, %), fri sd cue tieu (min) va cue dai (max) cho thay, mdt sd Id rimg da cd thi dat tieu chuan hoan giai doan phuc hdi rung Tuy nhi6n, vln dl nly se dupc lam rd hon d d c kit qua tilp theo Sd Iupng va kich fhudc cay gd tai sinh fren daf sau canh tac nuong riy la nhirng chi tieu quan frpng phan Inh tiem nang phuc hdi rung Trong dl tai nly da thdng ke chi sd phan Inh sd Iupng c&y tli sinh d thdi dilm nam 2011 va 2013, dd 11 mat dp cay fai smh cd trien vpng (chieu cao tii m frd I6n - NTS_2_11 va NTS-2_13), mat dp cay tli sinh cd chieu cao fir m frd Iln (NTS_3_11 va NTS_3_13) Kich thudc cay tli sinh duac phan anh thdng qua chieu cao binh quan cua nhung cay tai sinh co friln vong (HTS_2_11 va HTS_2_13) vl chilu cao binh quan ciia nhiing cay tai Luong fang frudng binh quan chung vl mat dp sinh cd chilu cao tir m frd Ien (HTS_3_11 va (ANTS_2/nam) va chieu cao cua cay fli sinh cd triln HTS_3_13) vpng (AHTS_2/nam) frong ca qui trinh phuc hdi Sd Iupng va kich thudc cay gd tli smh cdn dupc ning Ian lupt la 49,5 cay/ha/nam va 0,3 m/nSm, la phln anh frong mdi hen he vdi sd nam canh tac tuong ddi nhanh Tuy nhidn, fren tiing Id ning tdc dp nuong riy (A_CTNR) va sd nam phuc hdi ning phuc hdi rung la khic nhau, the hien rd qua d c dai (A_PHR_13) Theo sd hlu a bang cd till nhan xet Iuong STC, S (%), Mm va Max smh frIn dif sau canh tic nuong riy Bing Sd Iupng vl ldch thudc d y tli Cac chi so TB STC S(%) Min A_CTNR (nam) 7,5 1,0 12,9 6,0 9,0 A.PHR 13 (nam) 8,4 2,5 29,8 4,0 12,0 NTS 11 (cay/ha) 220,0 232,9 105,9 0,0 560,0 NTS_2 13 (cay/ha) 328,9 255,7 77,7 0,0 880,0 HTS 11 (m) 1,6 1,7 103,0 0,0 3,9 HTS_2J (m) 2,6 1,6 62,2 0,0 4,5 NTS_3_11 (cay/ha) 95,6 123,7 129,4 0,0 400,0 NTS_3_13 (cay/ha) 213,3 190,3 89,2 0,0 560,0 HTSJ 11 (m) 1,9 2,1 110,2 0,0 5,9 HTS_3_13 (m) 2,8 1,9 68,8 0,0 5,3 4NTS_2/nam (c/ha/ntoi) 49,5 34,4 69,5 0,0 106,7 ANTS_3/ntoi (c/ha/ntoi) 31,0 25,4 81,8 0,0 70,0 AHTS_2/nam (m) 0,3 0,2 62,5 0,0 AHTSJ/ntoi (m) 0,3 Dl phan anh rd ban su khic biet vl sd Iupng va kich thudc cay tli sinh giiia cac OTC, cln thief phan Max 0,6 0,2 72,0 0,0 0,7 Ioai chiing cic nhdm Kit qua phan Ioai dupc the hien d hmh 2a va 2b NONG NGHIEP VA PHAT TRIEN NONG THON - KY - THANG 1/2015 127 KHOA HOC CdNG N G H E Hinh 2b Phto loeii cic I tilu chuin theo s l luong v i kich thulc cay g l tii sinh Tnrlng hop CO bao gim cic ylu t l dia hinh, thi nhuong Vdi miic dd tuang ddng 40 - 45%, d c d cd thi hai cap bien sd; dau (*) phan anh he so tmmg quan co y nghra thdng ke, cang nhiiu sao, y nghra dupc xep vao mdt nhdm Vdi miic tuong ddngtii80% frd Iln, frong cl hai frudng hpp la bao gdm va khdng thong ke cang ldn; he sd tuong quan cang cao, cd bao gdm d c ylu td dia hinh, thd nhudng, cic OTC chir cang Idn) diu dupc chia nhdm Tuy nhien, phln Cto Cli vao bieu tin xa, da thilt lap duoc OTC d mdi nhom khdng gidng Dilu cho phuang trinh lien he giua mat d l cay tai sinh co thiy ring, vile lap d tieu chuan da bao quit kha tdt trien vpng (NTS_2_13) va chieu cao binh quSn cua su dao ddng ciia cac nhan td phan anh tiem nang cay til sinh co triln vpng (HTS_2_13) voi chi tilu phuc hdi rung frIn dit sau canh tic nuong riy tong hpp (Z) Hinh 2a Phan Ioai cic d tilu chuln theo sd luping v l kich thudc d y gd tli smh Tnidng hpp khdng bao gdm d c ylu td dia hinh, fhd nhuong De thiet lap mdi h6n he giua NTS_2_13 va HTS_2_13 vdi nhirng nhan td cd anh hudng chii ylu, da xay dung bilu dd tan xa d hinh HElBSHE^SmH^: :Eg]gE^@g@@Qgg B]0g@0@@Q@S: imaaesmsass KHHHHSSDBS! :SiaammBSE]s\^ HHHaHHBDBEgf fSJHSHiaHamnn fflHHHHHHaHS: mmmamBm^ma Hinh Bilu dl tto x» phto inh moi liln h | giiia sl lu^Dg v i kich thulc cay g l tii sinh vli nhiing nhto t l cl inh huong quan trpng (Tra theo hang ngang va cot doc se xac dinb dupc miic lien he giBa hai cap bien sd bat ky Dau cham cham ( ) phan anh khong co moi hdn he giira 128 NTS_2_13 - -87,077 + 0,9926.Z, r - 0,872, F-108,63 (6) HTS_2_13 -1,759 * O,003323.Z, r - 0,851 F-89,31 (7) Nhu vay, mat dp va chilu cao binh quto cua cay tai sinh co trien vong co liln h i rit chat voi d l day ting dat, xIp tang dit, so ntoi canh tac nuang ray va s l ntoi phuc hoi rimg Day la co sa cho vi|c xac dinh so ntoi phuc hoi rimg cin thilt, lim ca sa cho vile phtoloaitiem ntog phijchoi rimg a khu vuc 3.3 Phin loai Ulm ntog phuc h l i riing trtn di(t sau canh tic nuong ray Theo cong thiic (4) va (5), dong thoi cto cii vao phuimg trinh (6) va (7) da xac dinh dupc so nam phuc hli rimg can thiet tinh theo mat dl cay tai sinh CO triln vong (uaj,), theo chilu cao binh quto cua cay tai smh co triln vpng (n,, „), chenh lech ve so nam tinh theo mat dp va chieu cao cay tai sinh (AnJ Nhimg tri so dupc xac dinh theo t l hpp cua day tang dat (SD, cm), dp xIp ting dat (P, %) va so ntai canh tic nuong riy (A_CTNR, ntoi), (btog 4) NONG NGHIEP VA PHAT TRIEN NONG THON - KY - THANG 1/2015 KHOA HOC CONG N G H i SD.P Btog Bang tra sl nim phuctili rimg cin thilt dl dip ling tilu chl thtoh rimg An„ SD.F A_CTNR UcCH na_H UctN Uct_N (nam) (ntoi) (ntoi) (ntoi) (ntoi) (ntoi) (ntoi) A_CTNR AUct (ntoi) 2,7 19,3 13,6 5,6 3800 9,1 6,5 23,1 3,2 16,4 6,8 3800 11,0 7,7 27,0 19,1 7,9 1800 12,8 3800 9,0 3,7 1800 21,8 30,8 9,0 3800 10,3 14,6 4,3 34,7 10,2 1800 16,4 24,5 3800 4,8 11,6 38,5 11,3 27,3 3800 1800 10 10 12,9 18,3 5,3 2000 17,3 5,1 12,3 4000 8,7 2,5 6,1 20,8 6,1 10,4 2000 14,7 4000 3,0 7,4 17,2 24,3 8,6 2000 4000 3,6 12,1 7,1 27,8 8,1 2000 19,6 4000 9,8 13,9 4,1 2000 31,2 22,1 4000 15,6 11,0 4,6 9,1 10,2 2000 34,7 10 17,3 10 24,5 4000 12,3 5,1 4,6 8,3 2200 15,8 4200 11,2 5,8 2,4 5,5 9,9 2200 18,9 2,9 13,4 4200 7,0 6,5 22,1 11,6 2200 15,6 4200 8,2 3,4 25,2 2200 7,4 8 13,2 3,9 17,8 4200 9,3 28,4 2200 20,1 4200 8,3 4,4 10,5 14,9 9,2 10 10 31,5 16,5 2200 22,3 4200 4,8 11,7 2400 10,2 4,2 5 5,6 7,9 14,5 4400 2,3 17,3 2400 12,3 6 6,7 9,5 2,8 4400 5,1 20,2 3,2 2400 14,3 5,9 7,8 11,0 4400 23,1 12,6 3,7 2400 4400 16,4 6,8 8,9 7,6 9 4,2 26,0 10,0 14,2 2400 4400 18,4 2400 10 10 28,9 8,5 4,6 15,8 4400 20,4 11,2 2600 7,5 5 9,4 13,3 3,9 5,3 2,2 4600 4,7 16,0 6,4 2600 4600 9,0 11,3 2,6 7 5,5 2600 13,2 18,7 4600 7,5 10,6 3,1 6,2 2600 15,1 21,3 4600 8,5 3,5 12,1 4600 9 7,0 24,0 9,6 4,0 2600 13,6 17,0 10 4600 15,1 10 26,7 7,8 4,4 2600 10,7 18,9 5200 6,7 3,0 2,0 3400 10,2 7,2 4,7 5200 8,0 3,6 12,2 2,3 3400 8,7 L 5,7 5200 6,6 9,3 4,2 2,7 3400 10,1 14,3 5200 7,5 10,7 4,8 16,3 3400 11,5 3,1 5,4 18,4 3400 5200 8,5 12,0 3,5 13,0 10 9,4 5200 13,3 10 6,0 3,9 3400 20,4 14,4 Nhu vay, sd nam phuc hdi ning cln thilt tinh cm), dp xdp tang dat (P, %) va sd nam canh tac theo chilu cao bmh quan cua cay tli smh co triln nuong riy (A_CTNR, nam) Vi vay, dl dap ung dupc vpng (n^tn) luon cao hon so vdi sd nam phuc hdi tilu chi ning, can xac dinh sd nam phuc hdi ning can thilt tinh theo mat dp cay tli shih (n^^), rimg can thief tiieo nct_Hvdi sd nam chenh Idch (An^^ dao ddng fir din 11,3 Theo tieu chuan ky tiiuat Iam smh (2001), thdi nam, tiiy thudc vao td hpp cua dp day ting daf (SD, gian khoanh nudi phuc hoi ning ddi vdi rimg phong 1800 1800 NONG NGHIEP VA PHAT TRIEN NONG THON - KY - THANG 1/2015 129 KHOA HOC CdNG N G H £ hd diu ngudn la - nam Neu thdi gian khoanh nudi phuc hdi cho mdt ddi tupng nao can dai hon dl rung, thi se ap dung giai phap khic (Vu Tiln Hinh, Pham Van Dien, 2006) Vi vay, viec phan loai tilm nang phuc hdi ning duoc the hiln dbang Bing Phln logi tilm nang phuc hdi rimg tr6n dit sau canh tic nuong riy Thdi gian phuc hoi Nhdm Giai phap fac ddng rimg can thiet (nam) Khoanh nuoi bao ve 0, tiic II chi ap dung cho ddi tupng dit sau canh tic nuong riy Can Cli vao sd nam phuc hdi rimg cln thilt tien h^mh phan logi tiem nang phuc... va xay dung cac bang fra KFT QUA NGHBV Clhl 3.1 Tilm nSng da dang loli d y gd phuc hoi h^n dit sau canh tic nuong ray Tilm nang da dgng loai cay gd tli smh dupc bieu fhi qua chi sd d bang Can cii