Tgp chi Khoa hgc TruangDgi bgc Cdn Tho Phdn A Kboa hoc Tu nhien Cong nghf vd Moi tnr&ng 31 (2014) 125 135 Tap chf Khoa hpc Tri/dng Oai hpc Can Thtf website sj ctu edu vn DANH GIA LlTgiNG CACBON TICH L[.]
Tgp chi Khoa hgc TruangDgi bgc Cdn Tho Phdn A: Kboa hoc Tu nhien Cong nghf vd Moi tnr&ng: 31 (201 Tap chf Khoa hpc Tri/dng Oai hpc Can Thtf website: sj.ctu.edu.vn DANH GIA LlTgiNG CACBON TICH LUY CUA SINH K H I R I T N G TRAM TREN NEN DAT SET T ^ VU'CJN QUOC GIA U MINH THlTONG Truong Hoang Dan', Le Hoang Tdt' va Biii Truong Thg^ ' Khoa Mdi trudng & Tdi nguyen Thiin nhien Tnrdng Dgi hgc Cdn Tho ^ Vudn Qudc gia U Minh Thugng ^ Khoa Khoa hgc vd Ky thugt Dgi hgc Aarhus Dan Mgch Thdng tin chung: Ngdy nlian: 26/11/2013 Ngdy chdp nlign: 28/04/2014 Title: The assessment of carbon accumulation ofMalaleuca forest on clay soil at U Minh Thuong National Park Tir khda: Tich lOy cdc bon, rimg trdm dot set, vuan qudc gia U Minh Thugng Keyworils: carbon accumulation Malaleuca forest, clcty soil, U Minh Thuong National Park ABSTRACT The main objective of this research was to estimate carbon storage in Melaleuca forests in two distinct ages (under 10-year-old and over 10year-old) on clay soil in the U Minh Thuong National Park We measured diameter of breast height (DBH1.3m) total height, density, biomass, shrubs and lilterfall of Melaleuca in 40 standard quadrats (10 m X 10m) The density of under 10-year-old Melaleuca forest (7.315 individuals per ha) was greater than that of over 10-year-old Melaleuca forest (4.140 individuals per ha) However, the forest with age under 10 years showed significantly lower DBHI.Sm and lower total height than those in forest with age over 10 years There was no significant difference in lilterfall between the two-age levels afforests Six species in under 10-year-old forest and five species in 10-year-old forest were observed, wiih tn'o dominated plant species ofPhragmites vallatoria (L.) Veldk and Stenochlaena palustris (Burm) Bedd Carbon accumulation oj two ages (under 10-year-old and over 10-year-old) of Melaleuca forests had signijicanlly different values with 15.18 (ton C per ha) and 31.76 (ton Cper ha), respectively Muc liiu cita nghien citu Id uoc tinh khd nang luu trir cacbon cua hai cdp dg tudi rimg trdm (nhd han 10 vd ldn han 10) tren nin ddt set tgi Vudn qudc gia UMinh Thugng Dudng kinh d cao 1.3 m, chiiu cao mat dd sinh khdi, tdng cdy bui dudi tdn rimg vd thdnh phdn vdt rirng ciia trdm dugc thu thgp a 40 d tieu chudn (10 m x 10 m) Mat dd cua rimg trdm nhd han 10 tudi (7315 cdy /ha) cao hon mat dg cua rimg trdm ldn han 10 tudi (4140 cay/ha) Tuy nhien rimg trdm d cdp ludi nhd han 10 cd gid tri dudng kinh ngang nguc vd chiiu cao nhd han rimg trdm a cap ludi ldn hon 10 Klidng cd su khdc biit vi thdnh phdn vdt rung giira hai cdp tudi rimg tram Sdu lodi thuc vgt dugc ghi nhdn tgi rimg trdm nhd han 10 tudi vd ndm lodi thuc vdt a rimg trdm ldn han 10 tudi, sdv (Phragmites vallatoria (L.) Veldk.) vd chogi (Stenochlaena palustris (Burm) Bedd.) Id nhimg lodi chii yiu Hdm lugng cacbon udc linh cua rimg trdm theo hai dg ludi nhd han 10 vd lan han 10 tht ed su khdc biit vdi gid tri ldn lugt dgt 15,18 tdn C/liavd 31.763 tdn C/ha Tgp chi Khoa hgc Tnt&ng Dgi hgc Cdn Tho Phdn A: Khoa hgc Tv nbien Cong nghf vd Mai iru&ng 31 (201 G i d l THIEU Viec nghien ciiu vi hdm lugng cacbon ticfa liiy frong cdc he sinh thai riing dugc tiin hanfa vdi myc tiiu qudn \,, u c ? T mau chin thang the hien qua Hmh 5, 6, C i n h (g/m') ! ''iTi 10 11 o^l 12 ^7p, ab • Rimg < 10 tuoi Tlinnn G Rung > 10 tu6i Hinh 5: Sinfa kfaoi khd cua cdnh iing vdi hai cdp tufii Lugng sinh kfadi khfi cCia cinh frong riing trim Cling dp tudi nhd hon 10 tfaeo timg thdng dao dgng tir (13,75±0,54) g/ra^ din (I5,64±0,63) g/m^ giiia thing vdi cdc tfaang I, tfaing vd tfadng 11 (ndm trudc) cd sy khac biet (p0,05) Trong do, sinh khii ciitii khfl cua rimg fram frong dp tudi Idn hon 10 theo timg thing dao ddng tir (7,0±0,60) g/m- din (19.25±0,59) g/m^ vdi kit qud thdng kl cfao tfady sinfa khdi cdnh khd giiia cdc tfaang frong cung tuoi niy khic biet khdng cd y nghia thdng ke (p>0,05) Nguyen nhdn ciia sy khdc bill vl lugng sinh khdi kfad cua canh d rimg tram nhd hon 10 tudi Id ldm pfain cd dp tufli nhd thi mat dp cdy cao, frong dilu ki|n cgnh franh vi dnh sing vi dinh dudng, nhilu cinfa nharUi dl bj ddo thdi han so voi Iim phdn cd dO tuoi ldn (Ddng Quic Cuong, 2009) Tgp chi Khoa hgc Tnr&ng Dgi hgc Cdn Tho Pbdn A: Khoa hgc Tu nhien, Cong nghf vd Mdi Iruang: 31 (2014): 125-135 LACOATf) 2* OS as ns Thdng IB Rung 10 tudi Hinh 6: Sinh khdi kfad ciia Id ting vdi hai cap tudi Trpng lugng sinh khfii khfi cua li frong cimg tudi nhfi hon 10 theo tirag thdng dao ddng tir (109,83±3,81) g/ra^ din (125,56±5,45) g/m\ Trong sinh khdi khfi cua la dfii vdi rimg cd dd tudi Idn hon 10 dao dfing tii (125,25±4,69) g/m^ din (I35,I5±4,28) g/m^ Nhin chung, dfii vdi sinfa kfafii BoiiK (g/ni-) m Ririig •£ 10 tuoi khfi cua Id giiia cic thing khic bilt khdng cd y nghia thfing ke(p>0,05) ngoai trir thdng Nguyen nhan la thdng la giao miia giu'a miia mua va raiia khfi nen lugng sinfa khfii ciia li roi rung phdi cd su kfaic bilt n Ririifi -1 O tuoi Hinfa 7: Sinfa khoi kfad ciia bfing ijnigvdi hai cip tuoi Lugng sinh khdi kho ciia bfing frong cung tufii nhd hon 10tiieotimg thdng bien ddng tii 12,46 ±0,51 din 14,48±0,60 (g/m^), frong dd tiiang khac bill rd r?t so vdi cic thdng 6, vd 12 (p