S U DLJIVG CHi s d CHAT LUIJIMG D A T (SQI - SOIL QUALITY IIMDEX] DE DAIMH GIA HIEIXl TRAIMG CHAT
LUDIMG D A T RUIMG Q VUfJIM QUOC GIA P H U QUOC
Vo Dmh LongS Thai T h i n h Lugm^
TOMTAT
Dao Phu Qudc nlm a phia cue Tay nam cua Viet Nam, co tdng dien tich tu nhien la 58.936 ha, bao gdm 40 hon dao Ion nho, trong do dien tich VQG phu Quoc la 31.422 ha. Tat ca cac dao cua huyen dao Phu Qudc CO dang dia hinh chu yeu la doi mii. Rieng dao Phu Quoc, nhin tong quat co the chia dia hinh thanh 2 viing voi cac dac trung chinh nhu sau: Viing Bic Dao (tir tinh Ip 47 tro len) co quy mo dien tich khoang 40.000ha, tren 70% dien tich la nui (dp doc binh quan 25-30"), duoi 30% dien tich la ddi thIp va cac dai dat tuong ddi bing hoac lupn song. Nhin chung, cao dp thap din theo huong tir Bic xudng Nam va tir Dong sang Tay. Viing Nam Dao co dien tich khoang 16.700 ha, bao gom nhilu nui thap xen ke cac dai dat tuong doi bing va thap din theo huong tir Dong - Bic xuong Tay - Nam voi dp ddc duoi 15°. Nghien ciiu tap trung vao viec khao sat, thu miu, phan tich cac thong so ly hoa va dua vao chi sd chit lugng dat (SQI - Soil Quality Index) de danh gia hien trang chat lupng dat rimg tai Vuon Quoc gia (VQG) Phii Quoc.
Tir khoa: Chat lupng dat, Vuon Qudc gia Phu Qudc, phat trien bin vUng, tinh chat hoa, ly dat LDATVANDE
DIo Phu Qudc n l m trong vinh Thai Lan, phia cue Tay Nam cua Viet Nam trai dii tir 9°53' din 10°28' vi dp Bic vl 103°49' din 104°05' kinh dp Dong, ed tdng dien tich tir nhien II 58.936 ha, bao gdm 40 hdn dio ldn nhd, trong dd dien tich VQG Phu Qudc II 31.422 ha. Huyen Phii Qudc cd 10 dan vi h i n h chinh gdm: Thi trIn Duong D6ng, thi tran An Thdi v l d c xa: Cira Can, Cira Duong, Him Ninh, Duong Ta, Hdn Thom, Bai Thom, Thd Chau vl GInh Diu. Tat d d c dao cua huyen dio Phu Qudc cd dang dia hinh chu ylu II ddi niii. Dan sd nam 2008 ciia dao Phu Qudc II 89.410 ngudi, mat dd dan sd 152 ngudi/km^. Ty le tang dan sd ty nhien giam tir 1,40%/nam 2006 xudng cdn 1,32% nam 2008, ty le tang ea hoc khoang 3- 4%/nam. Nlm trong vimg nhiet ddi gid mua vl tilp gilp vdi hiln nen VQG Phu Qudc ed dilu kien khi hau rlt thuan lgi ddi vdi d c he sinh thai, chinh vi vay, tham thyc vat d day rat phong phu vl da dang.
Tuy nhien, ning vl dlt ning d VQG Phu Qudc bi tin phi nghiem trpng da gay Inh hudng xau d i n moi trudng dlt, d n h quan thien nhien, sy da dang cua dong, thyc vat tren dio. Sir dung b i n vung ning vl dat ning ddi hdi nhiing hieu bilt v l d c dieu kien dlt dai, dd II m6i trudng vl ddng thdi cung II dia b i n cho su tdn tai v l sinh trudng cua elc loli dong vat v l
' Trudng Dai hpc Cong nghiep TP. Hd Chi Minh ' Sd Tai nguyen va Moi tnrdng linh Kien Giang
thyc vat. Bii vilt neu k i t q u i danh gil tdng quan v l hien trang dlt rimg VQG Phu Qudc th6ng qua elc ehi sd chat lugng dlt n h l m gdp phln phat trien b i n viing rimg.
II. VAT UEU, PHUONG PHAP NGHIEN CUU
Kit hgp nhilu phuong phip khIc nhau de dieu tra, dinh gil vl phan tich hien trang chit lugng dat rimg tai VQG Phu Qudc.
1. Thu thap, tdng hgp tai Ueu nghien ciiu
Thu thap d c tii lieu cd lien quan nhlm tao co sd ly luan phuc vu cho viec so sinh vl dua ra cle nhan dinh lien quan d i n ddi tugng nghien ciru. Thu thap d c sd lieu v l dilu kien ty nhien, hoat dong kinh te - xa hoi, hien trang mdi trudng.
2. Khao sat thyc dia
Tiln h i n h khIo s i t thyc dia tai tat d d c xa vl thi tran cd rimg thugc VQG Phu Qudc; thu thap d c tii lieu vl chat lupng dat rimg, ddng thdi thu thap, ghi chip lai d c th6ng tin ca ban nhlm muc dich dinh gia d c dilu kien dat rimg tai d e vi tri nghien cuu. Thdi gian khao sit 5 ngly, bd tri phan diu d ea ba loai rimg (rimg chua phuc hdi, rimg dang phuc hdi vl rimg da phuc hdi) cua VQG Phu Qudc.
3. Lay m i u va phan tich m i u
Lay miu: long sd 240 mau dat rimg duge lay theo 2 tang: Tang ndng (tii 0 - 20 cm) va ting sau (20 - 40 cm) vIo 2 dgt theo d c nhdm dat phd bien tai VQG Phu Qudc ( b a n g l ) .
KHOA HOC CONG NGHE
Bang 1. Dia ban lay miu, sd miu va dieu kien dat rimg lay miu
STT 1 2 3 4 5 6 7
Dia ban X. Bai Thom X. Cira Can X. Cira Duong X. Duong To X. Ganh Diu X. Ham Ninh TT. Duong Dong
Sd mau/dpt T i n g
nong 8 8 12
6 10 12 4
r i n g sau 8 8 12
6 10 12 4
Dieu kien dat rim P Rimg chua
phuc hdi 6 6 8 4 6 8 2
Rimg dang phuc hoi
6 4 10
4 8 10
4
^img da phuc hoi
4 6 6 4 6 6 2
So lln lap 2 2 2 2 2 2 2
Tong sd miu
32 32 48 24 40 48 16
Phan tich miu: Cac chi tieu vat ly gdm: Ty trgng, dung trpng, dp xdp, dd am va d p hat (dt, thit, sit)..
duge tiln hinh tai Phdng Thi nghiem trudng Dai hgc C6ng nghiep TP. HCM.
Phan tich d c chi tieu hda hgc gdm: pH^a, nh6m trao ddi (Al^), mun (muutfing, humic, fulvie), da lugng (N„„„ P2O5, K2O), tinng lugng (Ca^^ Mg^^ SO/), vi lupng (Zn, Cu, Mo, B, Fe, Mn) vl kim loai nang: Cd, Hg, Pb, As; duge phan tich tai Trung tam sic ky TP. HCM.
Phuong phip dinh gii theo chi sd chat lugng dat (SQI- Soil Quality Index)
Chi sd SQI trong nghien ciru dugc tinh theo c6ng thire: ^SQI = X d c gil tri dan le.
Hmh 1. Dd thi chat lugng dat tang nong b. Thio luan: Kit qui dilu tra cho fhly, nhirng vi tri rimg chua phuc hdi cd ehi sd SQI rlt thap ddi vdi ea 2 ting dlt va theo kit qui dilu tra ghi nhan duge thi cay rimg d day phlt trien kim, do tai day phln ldn rimg d gin d c true giao thong hoac tilp gilp giua dat canh tic vl sinh sdng eua ngudi dan.
Ddi vdi nhimg vi tri rung dang phuc hdi hoac da phue hdi tai xa Bai Thom, chat lugng dlt diln biin theo chilu hudng tii khi din tdt, nhat II ddi vdi cle vi tri rimg da phuc hdi thi cay rimg phlt trien manh, cd nhilu vi tri cd rimg cay ldn thudng xanh II rong nhu:
Gil tri tdi da ciia XSQI la 26, day II tdng gia tri cua tat d 19 ehi tieu vat ly vl hda hgc dugc phan tich. Trong nghien cim nly, da su dung ehi sd SQI de dinh gil chit lugng dlt rimg nhlm phye vu cho viec bio tdn rung VQG cu the hon, nhlm dl phan loai dat, phan vung rimg, cho nen tat d cle th6ng so dugc xem xet diu cd tie dong rlt ldn din kit qua tinh toln, trong dd chi tieu vl do miin vl d p hat cua dat ddng vai trd chu dao.
III. KET QUA NGHIEN CUU VA T H A D LUAN
1. Chat lugng dat tai xa Bai Thom
a. Kdt qui phan tich chi sd SQI (hinh 1. 2)
Hinh 2. Dd thi chat lugng dat tang sau
Cay hg Diu (Dipteroearpaeeae), hg Sim (Myrtaceae), hp Hdng (Ebenaeeae)... Ngoli ra, hlu hit rimg dang phuc hdi vl da phye hdi tai xa Bai Thom it hoac khong chiu d c tic dong eua con ngudi.
Chat lugng dat b tang sau kem ban so vdi tang n6ng, him lugng mun va cle nguyen td d n thief cho sy phlt trien ciia cay trdng d ting sau cung kem hon so vdi ting n6ng xlt a ea 3 dieu kien dat ning.
2. Chat lugng dat tai xa Cua Can
a. Ket qui phan tich chi sd SQI (hinh 3. 4)
2 3 4 5 6 7 Vj Iri lay mau
Hinh 3. Dd thi chat lugng dat tang nong b. Thda luan: Xa Cira Can cd dac dilm dan cu sdng lau nam vl rimg hi anh hudng nhilu bdi d c boat dong dan sinh; chinh vi vay ml chat lugng dlt vl dat rimg d day tuong ddi kim; phln ldn dien tich rimg cua xa Ciia Can II rimg dang phuc hdi, chi cd mdt phln dien tich nhd II rimg da phuc hdi.
Kit qua phan tich dat rimg chua phye hdi eua cl 2 dgt diu cho chi sd SQI thap, chat lugng dlt kem, dlt khong duge che phu, do am thap, do ddc tuong ddi vl kha nang mat nude ldn. CIc loli thyc vat sdng d day chii ylu II Mua, Cd ke, Cd h6i, d c cay bui. So dua... Tai d c vi tri nly ed xay ra sy lan rimg de llm rIy, phln dien tich dlt rimg bi chat phi van cdn vl khi nang phue hdi rimg rat cham. Ngoli ra, do dlt chua cd cay che phii nen hi anh hudng manh bdi d c ylu td khi hau llm cho Idp mun vl chit dmh duong tren bl mat hi nia tr6i, kit cau dat kim, kh6...
Tai cle vi tri lay miu dlt rimg dang phuc hdi la
Hinh 4. Dd thi chat lugng dat tang sau
cle loai dat set dd vIng, dat sit, mot sd noi cd dat xam va bao phii bdi lop mim khi dly, nhung him lugng d c chat dinh duong khoing cho cay rimg chua cao, ddng thdi do trudc day hi tie dong manh bdi cle boat dong eua ngudi dan nen cay rimg d' day phuc hdi khi cham. Rieng d d c miu dat rimg da phuc hdi phan tich cho gil tri SQI khi, cle yeu td ve dd mun, cle thinh phln -vi lugng, da lugng dip iing dugc yeu cau phat trien ciia cay rimg. Chinh vi vay, cay rimg phat tiien kha manh, nhung hlu hit cay gd cdn nhd, chua cd nhilu cay ldn, thyc vat chii ylu la B6 b6. Kiln kiln, San den, San miu, Thi...
3. Chat lugng dat tai xa Ciia Duang
a. Ket qua phan tich chi sd SQI (hinh 5, 6).
Cira Duong la mot trong nhirng xa ed dien tich rimg khi ldn cua Phii Qudc, ddng thdi chat lugng dat rimg d day cung bien ddi ro ret.
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Hinh 5. Dd thi chit lugng dat ting nong b. Thao luan: Chi sd SQI cua nhOng miu dat rimg chua phue hdi b day thap ddi vdi d 2 tang dat, chat lupng dat kim, kh6ng dap iing yeu clu phat tiien cua eay rimg. Ben canh do, thyc vat d day ed dp che phu khi thap, mot sd noi khong cd cay hoac rat it cay bui nhd. Mac dii vay, khi so sinh vdi ciing dieu
Hinh 6. D6 thi chat lugng dat tang sau
kien sinh canh tai d e xa khIe tiii chit lugng dlt rimg chua phue hdi tai xa Cira Duong khi ban vl diln biin ly - hda dat cd chilu tdt.
Chi sd SQI eiia dat rimg d 2 dilu kien rimg dang phue hdi vl da phuc hdi tirong ddi tdt, ti-ong dat ed
KHOA HOC CONG NGHE
nhilu cac chit dinh duong vl h i m lugng mot sd nguyen td da lugng vl vi lugng thich hgp cho sy phat trien ciia cay rimg. Ngoli ra, rimg dang phuc hdi d xa Cira Duong phat triln khi, tao dilu kien thuan loi cho d c loli sinh vat trong dlt phan buy tdt d c chat
20 15 10 5 0
f u
14 12
1 2 3 4 _ 5 Vj tri lay mau
• D o t l S D o l 2 Hinh 7. Dd thi chit lugng dat tang nong c. Thio luan: Chi sd SQI eiia dlt rimg chua phuc hdi rlt thIp vl a ca hai ting dat cd sy thilu hut nguyen td d n thilt cho sy phat trien cua cay ning.
Chinh vi vay, rimg d day rlt thua, phlt triln kim, cd nhieu vi tri dlt trdng, thyc vat chii ylu II Mua, Sim, Song may... vl hi Inh hudng rlt nhilu bdi cac hoat dong san xult kinh doanh cua ngudi dan.
Tai d c vi tri rimg dang phuc hdi vl da phuc hdi, chi sd SQI dao dong tu' 12 den 18 cho fhly, dlt tai elc vi tri nly bien thien tu' trung binh din tdt. Ben canh
25 1 20
^ 1 5
B
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ON
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2 SToe-
ON 00 00
1 2 3 4 5 6 7 8 9 10 • Dot Vjtri lay mau Dot 2 Hinh 9. Dd thi chit lugng d l t ting n6ng b. Thao luan
Chat lupng dlt ning chua phuc hdi tai xa GInh Diu mac dii thap nhung k h i hon so vdi dat rung chira phuc hdi a d c xa Duong To, Cua Can vl Cira Duong. Mac du, kit d u dlt tai day bd rdi nhung dat cd ty le d t cao, dp Im thap, pH kha thap va thilu mot vii nguyen td can thilt cho cay ning phat trien nen dlt rimg chua phuc hdi d day it phu hpiD cho su phat trien cua thyc vat.
hiru CO tren b l mat va giiip dat giu' dugc do Im d n thilt cho cay ning.
4. Chat lugng dlt tai xa Duong T a
a. Ket qua phan tich chi sd SQI (hinh dd thi 7. 8)
20 15 B 10
, / 17 13 12 12_
2 3 4 5 Vj tri lay mau
DDpt 1 a Dot 2 Hmh 8. Dd thi chat lugng dat tang sau
dd, k i t q u i dilu tra cung the hien tham thuc vat tai 2 sinh d n h nly bien ddi tu' rung k h i thua, i-frng cd nhilu day leo (vdi cle loli thyc vat chii ylu II Cim, Lim xet, Thi, San den...) cho d i n rung ram. Tuy nhien, so vdi d c rimg da phuc hdi d Bai Thom hoac GInh Diu thi ning da phuc hdi d day vIn cdn thilu rlt nhilu d c loai cay gd ldn.
5. Chat lugng dat tai xa GInh Dau
a. Ket qui phan tich chi sd SQI (dd thi hinh 9, 10).
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0 D D g t l BDgt2 Hinh 10. Dd thi chat lugng d l t tang sau
Trong dilu kien rimg dang phuc hdi d xa GInh Diu chi sd SQI dao dong manh, chat lugng dat diln biin tu' xau den tdt. Kit qua dieu tra cho thay rimg dang phuc hdi d day dao dong tir thua d i n kha ram, cay ning phlt triln tdt vdi nhilu loai nhu: Tram ba vd, Kilng kilng. Bo b6... ca biet mpt sd vi tri rimg dang phuc hdi cd nhilu cay gd Ion. Kit qua phan tich cung cho thIy, lugng mun tren b l mat dat kha cao, d c nguyen td da lugng d n thilt cho sy phat trien
cua cay rung nhu: Mg, K, Ca, Fe diu cd trong dlt, dlt Im... day la dilu kien r l t thuan lgi cho sy phat triln ciia cae eay nhd, eay con.
Rieng cac m i u dlt lly tai d c vi tri rimg da phuc hdi cd chi sd SQI rlt cao, chat lugng dlt rung d day rat tdt vl hlu nhu cac ylu td da lugng, trung lugng va
g'lO
I 2 3 4 5 6 7 8 9 10 11 12 ° ^ 9 t 1
Vi tri lay miu HDpt2 Hinh 11. Dd thi chat lugng dat tang n6ng
b. Thio luan
Dlt rimg chua phuc hdi rlt nghIo cac chit dinh duong, thilu hut cac nguyen td da lugng vl vi lugng d n thilt cho sy phlt trien cua cay rimg. Nghiem trpng nhat II sy thieu nude trong dlt, dat b day cd ty le cit cao, it dugc che phu bdi cay rimg nen kha nang giii nude rat k i m vl thyc vat tai d e vi tri rimg chua phuc hdi d xa Him Ninh chii ylu II cay Mua, Trim, Diragai...
Chi sd SQI ciia dat rimg dang phue hdi trung binh, trong dlt xuat hien mot vii d c nguyen td cd lgi cho sy phat triln ciia cay rung, dac biet do duge che phu bdi thyc vat nen dat d day kha am vl h i m lugng miin tuong ddi cao. Tuy nhien, xlt chung thi dlt cd ty le sdi eao, thilu hut nhilu nguyen td vi lugng d n thilt nhu Cu, Mn, Zn... va thyc vat d day ehii yeu la cly Xuong cl, Dau, B6 bo, Bdi loi... vdi kich thudc nhd.
Chi sd SQI ddi vdi d c miu dat rimg da phuc hdi d xa Him Ninh d d hai dgt lay m i u diu eao. Dac biet, mpt sd noi cay rimg da phlt trien trd lai vdi sy dan xen giua nhilu cay nhd, cay ldn; mot sd loli cay tieu bieu II Thi, San trIng, Diu, Se... dang phlt triln kha tdt.
7. Chat lugng dat tai thi tran Duong Dong a. Ket qua phan tich chi sd SQI
Thi tran Duong D6ng vdi phln dien tich rimg thude VQG rlt it nen sd miu thyc hien it ban so vdi d c dia ban khac.
vi lugng d n thilt cho sy phlt trien cua cay rimg diu CO dly dii trong dlt, dat cd dp thoang khi cao, nhilu mun vl kha nang giu nude tdt.
6. Chat lugng dat tai xa Him Nmh
a. Ket qui phan tich chi sd SQI (hinh 11. 12)
20
15
^-10
— ^ —
r- r-
NO
2 3 4 5 6 7 8 9 101112 Vj tri lay miiu
DDpt 1
ODort2 Hmh 12. Dd thi chat lugng dat ting sau b. Thio luan
Dilu kien dlt rimg cho thay ehi sd SQI dao dong tir 6 din 16, chit lugng d l t rimg d day khong eao, cac ylu td ly - hda trong d l t khdng d i m bao d c dilu kien tdt cho sy phlt trien ciia ely rimg. Nguyen nhin chinh II do rimg d dly chju sy tie ddng manh bdi d e boat dong tryc tilp v l giln tilp tir con ngudi.
IV. KET LUAN
1. Phln ldn dlt rimg d VQG Phu Qudc phan bd tren dia hinh ddc (>15"), ting dlt mdng (<50 em) va ed thinh phln ca gidi th6, do phi ty nhien eua dlt thIp, dac biet ddi vdi elc vi tri rimg chua phue hdi thi d c dinh duong da lugng, trung lugng vl vi lugng hiln thien tir nghIo d i n rat ngheo.
2. Cac vi tri rimg chua phue hdi, dang phue hdi v l da phuc hdi cd chat lugng rat khIc nhau. Rimg da phuc hdi ed chat lugng d l t rat tdt, phii hgp vdi yeu clu phlt trien eiia cay rimg, dlt ed thinh phln ea gidi min, do xdp eao, d e nguyen td vi lugng va da lugng nam trong gidi ban cho phip. O vi tri rimg chua phuc hdi da sd dlt cd chat lugng thIp vl cay rimg thua thdt, dlt kh6 vl chu ylu II dat d t .
3. Mac du rimg Vudn qudc gia Phu Qudc vIn tdn tai mdt vii vi tri dat bi suy tholi, rimg thua, dat kh6...
nhung k i t qua dieu tra, khao sit, cho thay: Rimg d VQG Phii Qudc dang phlt trien theo ehilu hudng k h i tdt, e6ng tac bao ve v l phuc hdi rimg da vl dang dat duge k i t q u i kha quan.
KHOA HQC CONG NGHE
TAI UEU THAM KHAO
1. Bg N6ng nghiep vl Phlt trien nong thon, 2006. Cam nangnginh lam nghiep, 2006.
2. Bd Nong nghiep v l Phlt triln nong th6n, 2006. Saket cdng tic theo ddi diSn bien rung vi dat lam nghiep trong luc lugng kiem lam giai doan 2001- 2006. Cue Kilm lam, 2006.
3. Le Due - TrIn KhIc Hiep, 2005. Giio trinh dat vi bao ve dat NXB HI Noi, 2005.
4. HoIng Hoe, 1998. Bio ve va phit hien tai nguyen ning Viet Nam. NXB N6ng nghiep HI Noi, 1998.
5. Vien Thd nhuong Nong hda, 1998. Sd tay phan tich dit - nude, phan bdn. cay trdng. NXB Nong
nghiep HI Ngi, 1998.
6. Bharad, G. M, M. B, Nagdeve et all. Land use systems on contour for sustainable resource management in rainfed watershed. The International Symposium on Integrated Land use management for Tropical Agriculture. Queensland, Australia, 15 - 25 September 1992.
7. FAO. Land evaluation for development. Soil bulletin 64, FAO, Rome, 1990.
8. FAO. Land evaluation and farming system analysis for land use planning (FAO working document), FAO, Rome, 1992.
USING OF SOIL QUALTFY INDEX (SQI) TO ASSESS FOREST SOIL QUALTFY OF PHU QUOC NATIONAL PARK
Vo Dinh Long, Thai Thanh Luom Summary
This study concentrates on investigation, sampling, analyzing some physics-chemical parameters.
Moreover, present situation of foi'est soil quality of Phu Quoc National Park is assessed basing on SQI (Soil Quality Index). Results of this study sho'w the quality of soil in three condition of forest of Phu Quoc National Park and provide the decision makers of knowing relationship between soil and environment and how to control all of them for sustainable development.
Keywords.- Soil quality index, Phu Quoc national Park, sustainable development Ngudi phan bien: TS. Biii Huy Hien
THONG BAO
Ve viec chap nhan don dang ky bao hg gidng eay trdng mdi
Can cir Dilu 174, kholn 2,khoan 3 Dilu 176 v l Dilu 177 Luat Sd hiru tri tue;
Can cii don dang ky bao hp gidng cay trdng mdi eua td ehiic, c l nhan;
Can CU' k i t qui thIm dinh don dang ky bao hp gidng cay trdng;
Van phdng Bio hp gidng cay trdng mdi - Cue Trdng trgt th6ng b i o c h i p nhan don dang ky bao hd gidng eay trdng mdi sau:
So don
2010009
20100010
Ngay nop don 16/03/2010
23/03/2010
Nguoi nop don
Le Hiing Lan
Vien di tuyen nong nghiep
Ten gidng cay trong Nang hoa 9
DT 2008
Loai cay trdng
Liia
Dau tuong
Tac gia gidng cay trdng Le Hung Lan
Mai Quang Vinh va CTV:
Ngo Phuong Thinh, Pham
Thi Bao Chung
Chu so hiru giong cay trong/Bing
bao hp Le Hung Lan
Vien di truyen nong nghiep
Ngay chap nhan don 02/04/2010
02/04/2010