Nguyen Vdn Tudng vd Dtg Tap chi KHOA HOC & CONG NGHE 85(09)/2:47-52
DAC DIEM CAU TRUC VA TAI SINH TlT NHIEN TRONG MOT SO QUAN XA THl/C
V A T T A IXA KY PHU,
H U Y E NDAI TlT, TINH THAI NGUYEN
Nguyen Van Tu'O'ng', Le Ngoc Cong^ Biii Thj Dau", Nguyen Thj Thu Ha 'Sa Gldo due vd Ddo tgo tmh Tuyen Quang,
'Tnr&ng DH Sir phgm - DH Thdi Nguyen
TOM T A T
Ky Phil la xa mien nui nam d phia nam huyen Dai Tir, each trung tam huyen khoang 15 km, cd dien tich tu nhien la 16.021 ha. Trong cac trang thai tham thuc vat nghien ciru da thdng ke dugc 216 loai, 170 chi thugc 75 hg cua 4 nganh thuc vat bac cao cd mach, thanh phan dang sdng trong cac trang thai cd 5 dang (Ph, He, Cr, Th, Ch). Cac dac diem td thanh loai, mat do, phan bd va chat lugng cay tai sinh cho thay nang lire tai sinh tir nhien tai khu virc nghien ciru cd chieu hudng tang, can thiic day qua trinh dien the dd bang cac bien phap ky thuat lam sinh cu the cho timg trang thai tham thuc vat de dat hieu qua cao ban.
Til' khoa: Xd Ky Phu, thdm thuc vgt, rirng thie sinh, trdng cd, trdng cdy bid.
MQDAU
Ky Phii la xa mien mii nam d phia nam huyen Dai Tir, each trung tam huyen khoang 15 km, cd dien tich tu nhien la 16.021 ha; phia bac giap xa Luc Ba, phia nam giap xa Cat Ne, phia ddng giap xa Van Thg, phia tay giap xa Van Yen. Xa Ky Phii mang dac diem chung ciia khi hau nhiet ddi gid miia. Hang nam chia lam 2 miia rd ret la miia khd va miia mua, nhiet do trung binh mua khd la 18,5° C vdi sd gid nang trung binh 4 gid/ngay va nhiet do trung binh miia mua la 27,5°C, sd gid nang trung binh 7,5 gid/ ngay. Lugng mua binh quan mdi thang miia mua la 205,25mm, trong viing cd hd Gd Mieu vdi dien tich 320ha va nhieu khe, sudi la ngudn du trQ- nude quan trgng cho san xuat ndng, lam nghiep.
Xa Ky Phil cd dan sd 7.161 ngudi vdi 2.063 hd, chii yeu la dan tdc Kinh, cdn lai la cac dan tdc thieu sd nhu Tay, Niing. Mirc sdng hien nay ciia cac hd gia dinh trong xa d mirc trung binh so vdi binh quan chung ciia huyen, thu nhap chu yeu van la san xuat ndng, lam nghiep. Viec giao dat giao riing da dugc trien khai va cd nhirng hieu qua tich cue. Vdi dieu kien tu nhien va xa hdi ciia xa Ky Phu nhu vay la dieu kien thuan Igi cho qua trinh tai sinh, khoanh nudi phuc hdi rirng.
* Tel: 0915.462404
DOI TUONG NGHIEN CUU
VA PHUONG PHAP Doi tuo'ng
La he thuc vat cac trang thai tham thuc vat thir sinh chu yeu tai xa Ky Phu, huyen Dai Til', tinh Thai Nguyen gdm: Tham cd (thdi gian phijc bdi 2 nam); Tham cay bui (thdi gian phuc bdi 7 - 9 nam) va Riing thir sinh (thai gian phuc hdi 1 7 - 1 9 nam)
Phircrng phap nghien cuu
Phucmg phdp tuyen dieu tra (TDT) vd d tieu chudn (OTC)
- Tuyen dieu tra: trudc bet la xac djnh dja diem nghien cdu, can cu' vao ban dd ciia khu vuc lap cac TDT. TDT dau tien cd hudng vudng gdc vdi dudng ddng mirc, cac tuyen sau song song vdi tuyen dau. Chieu rdng quan sat cua TDT la 4m. Khoang each giua cac tuyen la 50 - 100m tiiy vao dja hinh cu thi cua tirng quan xa. Dgc theo tuyen dieu tra bd tri 4- 6 OTC , moi d cd dien tich 400m^ (20x 20 m) ddi vdi riing thiir sinh, 16m^ doi vdi tham cay bui va 4m^ (2x2m) doi vdi tham cd.
- O tieu chuan: de thu thap sd lieu tham thuc vat, chiing tdi ap dung OTC vdi cac kich thudc neu tren. O dang ban (ODB) dugc bo tri tren cac dudng cheo, dudng vudng gdc va cac canh ciia OTC 400m'. Tdng dien tich cac ODB phai dat it nhat la 1/3 dien tich OTC. Tren TDT va OTC xac djnh thanh phan, dang song, do chilu
Nguyen Vdn Tudng vd Dig Tap chi KHOA HOC & CONG NGHE 85(09)/2: 47 - 52
chdi Cay chdi
nua an chdi an 1 nam cao, mat do cac loai cay gd tai sinh. Ngoai ra dgc hai ben tuyen dieu tra cQng dat them cac ODB phu de thu thap sd lieu bd sung.
Phuang phdp phdn tich mdu thuc vgt
Xac djnh ten loai cay: Theo Cdy cd Viet Nam ciia Pham Hoang Hd (1991-1993) [2]; Ten cdy rimg Viet Nam ciia Bd ndng nghiep va PTNT(2000)[3]...
Xac djnh dang sdng theo thang 5 bac cua Raunkiaer (1934) va Hoang Chung (2008) [1]; Cay cd chdi tren mat dat (PhanerophytesJ-Ph; Cay chdi sat dat (Chamerophytes)-Ch; Cay
(Hemicryptophytes) - H e ; (CryptophytesJ-Cx; Cay (TheophytesJ- Th.
Phuong phdp xir ly sd lieu
Cac so lieu thu thap dugc xir ly tren phan mem Excel.
Thdi gian tien hdnh
Chiing tdi thuc hien nghien ciiu trong hai nam 2010 -2011 va tiln hanh 4 dgt di thuc dja thu mau. Dgt I: ngay 21/08/2010; Dgt 2; ngay 05/12/2010; Dgt 3: ngay 12/03/2011; Dgt 4;
ngay 15/05/2011.
KET QUA VA TEL\0 L U A N
Dac diem cau true cua cac trang thai tham thirc vat
Cdc trgng thdi dgc tnmg cua thdm thuc vdt
Qua nghien ciiu ngoai thuc dja chung tdi da xac djnh tai xa Ky Phii cd cac trang thai tham thuc vat la: tham cd, tham cay bui, tham cay trdng ndng nghiep, rirng trdng, riing tai sinh tu nhien. Chung tdi da lira chgn 3 trang thai:
Tham cd, tham cay bui va riing thu- sinh lam doi tugng nghien cii'u.
Dgc diem cau true to thdnh cua cdc trgng thdi thdm thirc vdt
Trong cac trang thai nghien ciru da thu dugc 216 loai , 170 chi thugc 75 hg cua 4 nganh thuc vat bac cao cd mach la: nganh Mgc tac {Equisetophyta), nganh Thdng dat {Licopodlophyta), nganh D u a n g xi {Polypodiophyta) va nganh Mdc Lan {Magnoliophyta). Ket qua dugc trinh bay d bang 1.
So lieu d bang I cho thay, nganh Mgc t$e (Ecjuisetophyta) cd sd hg, chi va loai thap nhat (1 hg, chiem 1,33%; 1 chi chilm 0,59%;
1 loai chilm 0,46%)). Tiep sau dd la nganh Thdng dat (Licopodiophyta) cd 2 hg (chiem 2,66%), 2 chi (chilm 1,18%) va 2 loai (chilm 0,92%). Nganh Duong xi (Polypodiophyta) cd 4 hg (5,33%), 5 chi (2,94%), 6 loai (2,77%). Nganh Mdc lan (Magnoliophyta) cd sd hg, chi va loai chiem uu the vdi 68 hg (chilm 90,68%), 162 chi (95,29%) va 207 loai (95,85%). Mat khac, tai mdi trang thai tham thuc vat nghien ciru chung tdi da thdng ke dugc sd hg, sd chi, sd loai. Ket qua dugc trinh bay g bang 2.
Bang 1. Sd lugng va su phan bd cac taxon thuc vat d KVNC TT Ten nganh
. Mgc tac (Equisetophyta)
^ Thdng dat (L Icupodlophyta) Duong xi (Polypodiophyta) Mdc lan
4 {Magnoliophyta) 4.1. Ldp Mdc lan (Magnoliopsida) 4.2. Ldp Hdnh (Liliopsida) Tong
So lugng
1 2 4 68 59 9 75
Ho Tyle
(%) 1,33 2,66 5,33 90,68 86,76 13,24 100
Chi So luong
1 2 5 162 148 14 170
Tyle (%) 0,59 1,18 2,94 95,29 91,35 8,65
100
Loai So lugng
1 2 6 207 192 15 216
i Tylf
(%) 0,46 0,92 2,77 95,85 88,89 11,11 100
Nguyen Van Tudng vd Dtg Tap chi KHOA HOC & CONG NGHE Bang 2. Sd lugng va ty le (%) cac hg, chi.
_ „ Cac trang thai TTV 1 Rimg thir sinh 2 Tham cay bui 3 Tham cd
Cgng:
Ho
So luo'ng Ty le (%) 74 98,66 49 65,33 25 33,33 75 100
85(09)/2: 47 - 52 , loai trong cac trang thai tham thuc vat
Chi
So lugng Ty le (%) 150 88,23
99 58,23 41 24,11 170 100
Loai Sd lug'ng
183 120 45 216
Ty le (%) 84,72 55,55 20,83 100 Qua nghien ciiu thanh phan loai d 3 trang thai
ciia tham thuc vat thu- sinh, chiing tdi cd mdt sd nhan xet nhu sau:
Ca 3 trang thai deu cd ciing dieu kien lap dja, ngudn gdc trudc kia la rirng tu nhien. Sau khi bj khai thac nhting cay gd Idn va chat trang lam nuong ray rdi dat bj bd hoang. Sd loai thuc vat tang theo thai gian: O trang thai tham cd cd 45 loai, trang thai tham cay bui la 120 loai va den trang thai rirng thiir sinh la 183 loai. Sd loai cay gd tang dan theo tudi phuc hdi va dac biet nhu'ng cay gd cd gia trj kinh te cao thay the dan nhu'ng loai cay ua sang, thdi gian sinh trudng ngan.
Nhu vay, trong ciing dieu kien lap dja, 3 trang thai thuc vat rat dien hinh ma chiing tdi nghien ciru da phan anb su khac nhau ve thanh phan loai, sir phat trien ciia cac loai uu the va su thay the dao thai ciia cac loai kem thich nghi. Su khac nhau dd cdn phan anh quy luat cua qua trinh dien the phuc hdi tham thuc vat rirng.
Bang 3. Thanh phan dang song
Ve thanh phan dang sdng. chirng tdi ap dung each phan loai dang sdng cho khu vuc nghien cuu theo Raunkiaer (1934) va sau nay Nguyen NghTa Thin (2008)[4], Hoang Chung (2008)[1]. Ket qua nghien cii'u dugc trinh bay d bang 3.
De danh gia thanh phan dang sdng trong tiing trang thai tham thuc vat d KVNC, chiing tdi da thdng ke va tdng hgp trong bang 4.
Nhu vay, dang sdng thuc vat d day da the hien dugc tinh chat nhiet ddi dien hinh, trong dd nhdm cay chdi tren mat dat (nhdm cay dai dien cho cac viing nhiet ddi- Ph) chiem uu the hoan toan so vdi cac nhdm dang sdng cdn lai (la nhirng nhdm oai dien cho cac he thuc vat vimg dn ddi, dn ddi ban hoang mac- Ch, He, Cr, Th). Tir ket qua bang 4 ta cd cdng thu'c phd dang sdng trong cac kieu tham thuc vat tai xa Ky Phu, huyen Dai Tii' theo Raunkiaer (1934) nhu sau:
SB = 69,92 Ph + 5.55 Ch + 14,35 He + 3,24 Cr + 6,94 Th
trong cac trang thai tham thuc vat r r r ^ r ^ ^ a i ^ g ^ Ph Ch He C r Chi tieu NC —•—___^
Sd lu-gng 151 12 31 7 Tyli(%) 69,92% 5,55% 14,35% 3,24%
Th 15 6,94%
Bang 4. Thanh phan dang sdng trong cac trang thai tham thuc vat _ i Cdc trang thdi thdm thirc vat nehien ciiru Udngsong . . . .
Rung thu-Sinn Tham cay bin
Sdloai 129 70 T y l e ( % ) 70,49 58,33
Thdm CO 7 15,9 Ch
He Cr Th
Sd loai Ty le (%) Sd loai Ty le (%) Sd loai Ty le (%) Sd loai Ty le (%)
4,37 31
J6^3_
~5~
2,73 10 5,48
11 9,16
20 16,66
6 5,0 10,85
3 6.81
17 38,83
1 2,27
16 36,19
Tdng 183 120 45
Nguyen Vdn Tudng vd Dtg
Dac diem tai sinh tir nhien trong cac trang thai tham thirc vat
Dgc diem cdu true td thdnh, nwt do cdy tdi sinh
Ket qua nghien ciiu ve cau triic td thanh, mat do cay tai sinh tai khu vijc xa Ky Phii, chiing tdi chi nghien ciru d hai trang thai Tham cay bui va Rirng thu sinh, do tham cd mat do cay tai sinh cdn qua thap nen chiing tdi chua de cap den d bai bao nay. Sd lieu dugc thdng ke dbang 5.
Til- kit qua bang 5 cho thay: O trang thai tham cay bui phuc hdi sau nuong ray cd tdng sd 20 loai cay tai sinh xuat hien, mat do 3256 cay/ha va cd 9 loai cay tai sinh tham gia vao cdng thuc td thanh. O trang thai rimg thii- sinh phuc hdi sau nuong ray cd 25 loai cay tai sinh xuat hien vdi mat do 3959 cay/ha, trong dd cd
10 loai tham gia vao cdng thirc td thanh.
Chdt lugng vd ngudn gdc cdy tdi sinh
Chat lugng va ngudn gdc cay tai sinh trong cac trang thai tham thuc vat nghien cuu dugc tdng hgp d bang 6.
Til- ket qua tren cd the thay la
- Cay tai sinh chu yeu cd ngudn gdc tir hat bien ddng tii- 75,80% (Rii-ng thii- sinh) den
Tap chi KHOA HOC & CONG NGHE 85(09)/2: 47 - 52 80.03%o(Tham cay bui). Dieu do chung td cac loai cay gd chii ylu la tai sinh tii' hat, chi mdt phan nhd cd ngudn goc tir choi. Dac diem nay thuan lgi cho viec hinh thanh tang riing chinh trong tuong lai. Vi trong ciing mgt loai cay thi cay mgc tir hat cd ddi sdng dai hon cay chdi, kha nang chdng chju vdi dieu kien bat Igi cua ngoai canh tdt hon cay tai sinh chdi.
- Phim chit cay tai sinh: Ty le cay tdt bien dgng tir 59,33% din 62,26%, cay trung binh tir 23,92% din 24,93% va cay xiu tir 12,81%
din 16,75%. Nhu vay, ta thay rang phan Idn cay tai sinh cd chat lugng tdt va trung binh, dd la dilu kien thuan Igi cho qua trinh tai sinh tu nhien de phuc hdi rii'ng. Bien phap ky thuat ap dung d day la xiic tien tai sinh tu' nhien, hoac cd the ket hgp trdng bd sung cac loai cd gia tri kinh te (vi mat do cay tai sinh cdn thap), nudi dudng cay tai sinh muc dich (Vang anh. Tram trIng, De gai, ...) nham nang cao chat lugng rimg, phii hgp muc tieu kinh doanh, dap ung yeu cau phdng hd ket hgp kinh te.
Dac diem phan bo cay tai sinh
Phdn bd cdy tdi sinh theo cdp chieu cao Ket qua dugc tdng hgp d bang 7
;iit Bang 5. Cau triic td thanh, mat do cay tai sinh d hai trang thdi TTV
TT Ten loai
Tham cay bui Mat do (cay/ha)
RO To thanh
(%) Ten loai
ng thu'sinh Mat do (cay/ha)
Td thanh (%) 1
2 4 5 6 7 8 9 10
Sau sau Xoan Ba soi Mang tang Vang trimg Dom ddm Lau Thau tau Thimg muc mo /1 lodi khac
520 473 350 253 217 212 207 177 164 675
15,97 14,52 10,74 1,11 6,66 6,51 6,35 5,43 5,03 21,03
Cheo An do Vang anh Tram trang Vang trimg Xoan nhir
Xoan Ba soi Mang tang De gai An do
Lim vang IS lodi khac
560 420 383 361 321 301 247 223 203 197 743
14,14 10,60 9,67 9,11 8,10 7,60 6,23 5,63 5,12 4,97 18,83
Tdng 20 3256 100 25 3959 100
Bang 6. Chat lugng va ngudn gdc cay tai sinh Trang thai TTV N/ha Ty le chat lugng (%)
Tit TB Xlu Hat
Nguon goc
% Choi %
Tham cay bui Rimg thir sinh
3256 3959
59,33 62,26
23,92 24,93
16,75 12,81
2606 3001
80,03 75,80
650 958
19,97 24,20
Nguyen Vdn Tuang vd Dig Bang 7.
Cap chieu cao (cm) 1 (<50)
11(51-100) I1I( 101-150) IV ( 151-200) V ( >200) Tong
Tap chi KHOA HOC & CONG NGHE Phan bd cay tai sinh theo cap chieu
Tha N (c/ha)
775 1011
668 405 397 3256
m cay bui Ty le ( %)
23,80 31,05 20,51 12,43 12,21 100
cao d hai trang thai Rill N (c/ha)
705 1110
990 716 438 3959
TTV ng thii
85(09)/2: 47 - 52
sinh Ty le (%)
17,80 28,03 25,00 18,08 11,09 100 Qua ket qua bang 7 cho thay mat do cay tai
sinh d tham cay bui la 3256 cay/ha, rimg thii sinh la 3959 cay/ha. Tuy nhien sir bien ddng nay la khdng rd rang, mat do cay tai sinh d trang thai tham cay bui va rirng thii sinh tap trung nhieu d cap chieu cao II (51-100cm), mat do bien ddng tir 1011 cay/ha den 1110 cay/ha (chilm ty le tir 28,03% - 31,05 %); Ci cap chieu cao I (<50cm), bien ddng tir 705- 775 cay/ha, (chilm 17,80%- 23,80%); 0 d p chieu cao 111 (101-150cm), bien ddng tir 668- 990 cay/ba, (chilm 20,51% - 25,00%); Q d p chieu cao IV (151-200cm), bien ddng tir 405- 716 eay/ha, (chilm 12,34%-18,08%). Mat do cay tai sinh thap nhat d cap chieu cao V (>
200cm) bien ddng tii' 397 cay/ha-438cay/ha, (11,09%-12,21%).
Phdn bo cdy theo mat phdng ndm ngang Ket qua nghien cuu dugc thdng ke d bang 8 Ket qua tren cho thay phan bd cay tai sinh tren mat phang nam ngang d trang thai tham cay bui cd dang phan bd cum, cdn d riing thii- sinh cd dang phan bd ngau nhien.
De xuat mot so bien phap lam sinh phuc hoi tham thuc vat
Tir ket qua nghien cuu ndi tren, de day nhanh qua trinh dien the phuc hdi rirng can phai tac ddng cac bien phap ky thuat lam sinh phii hgp tuy theo tiing ddi tugng cu the.
- Trang thai tham cay bui: Do thdi gian phuc hdi til- 7 - 9 nam tudi, do che phu 60-70%, mat do cay tai sinh 3256 cay/ha vdi 59,33% cay tai sinh cd chat lugng tdt thi can cii vao chirc
nang cua riing neu la rirng phdng hd thi ap dung ky thuat khoanh nudi bao ve, ket hgp ludng phat day leo, giam bdt cay bui canh tranh va chen ep cay gd de xiic tien nhanh qua trinh phuc hdi rirng.
Neu la riing san xuat thi cd the ap dung cac giai phap sau: Trdng bd sung cac loai cay gd cd gia trj kinh te cao (lim, de, tram...), trong qua trinh cai tao rirng can giu lai cac loai cay gd tang cao ciing nhu cac loai cay tai sinh.
Ngoai ra can ngan can su pha hoai ciia con ngudi, gia siic va phdng ngii-a chay rirng nham bao ve tham thuc vat tai sinh tu nhien.
- Ddi vdi riing thu sinh thdi gian phuc hdi 17 - 19 nam: Dieu tiet td thanh tang cay cao theo hudng tang san lugng gd cd gia trj kinh te, tia thua va khai thac trung gian nhung loai cay khdng dap irng nhu cau kinh te, phdng hd, tan dung san pham gd xay dung, nguyen lieu giay sgi, gd van dam (Bd de, Cheo tia, Thdi ba, Ba soi, ...) va chat ddt phuc vu cho sinh boat ddi sdng cua ngudi dan. Song qua trinh khai thac phai bao dam dimg quy trinh, khai thac bao dam tai sinh rirng va ve sinh rirng.
Dieu chinh do tan che tao dieu kien cho cay tai sinh sinh trudng phat trien tdt, dilu tilt td thanh cay tai sinh thdng qua viec xuc tien tai sinh, nudi dudng nhirng loai cay muc dich, loai bd nhung loai cay it gia trj, pham chat kem. Ddng thdi ludng phat day leo, cay bui, tham tuai tao dieu kien cho cay tai sinh cd khdng gian dinh dudng de sinh trudng.
Song viec dieu tiet phai bao dam yeu d u mat do cay tai sinh cd trien vgng, cd gia trj dat tren 1000 cay/ha.
Nguyin Vdn Tudng vd Dtg Tap chi KHOA HOC & CONG NGHE 85(09)/2: 47 - 52 Bang 8. Phan bd cay theo mat phang nam ngang d hai trang thai TTV
Cac trang thai TTV N/ha So k/c do A, r U Tham cay bui 3256 36 0,3256 0,556 -4,19 Rii-ng thir sinh 3959 36 0,3959 0,850 0,83
Kieu phan bo Cum Ngau nhien KET LUAN
1. Dac diem ve thanh phdn loai, dang sdng thuc vat trong cac trang thai nghien ciiu la kha phong phii va da dang. Da thdng ke dugc 216 loai thudc 170 chi, 75 hg ciia 4 nganh thuc vat bac cao cd macl. (Mdc tac, Thdng dat, Duong xi, Mdc lan). Trong cac trang thai tham thuc vat nghien ciiu cd 5 nhdm dang sdng (Ph, Ch, Cr, He, Th).
2. Dac diem tai sinh tu nhien trong cac trang thai TTV: Sd loai cay tai sinh bien ddng tii' 12-19 loai (rirng thir sinh), trong do sd loai tham gia vao cdng thirc td thanh cd tir 9-10 loai (tham cay bui). Mat do cay tai sinh dao ddng tir 3256 - 3959 cay/ha. Phan bd cay tai sinh theo cap chieu cao tap trung chii yeu d cap chieu cao II (51-100cm), bien ddng tir 1011-1110 cay/ha. Mat do cay tai sinh giam dan khi cap chieu cao tang len. Phan bd cay tai sinh theo mat phang nam ngang d riing thu- sinh cd kieu phan bd ngau nhien, a tham cay bui la phan bd cum. Ngudn gdc cay tai sinh til- hat dao ddng tii- 75,80% (tham riing thu-
sinh) den 80,03% (tham cay bui), tii- chdi lan luot la 24,20% va 19,97%. Cay tai sinh cd chat lugng tdt dat 59,33%o, trung binh 23,92%, xau 16,75%o (d rii'ng thir sinh), d tham cay bui tuong tu la 62,26%, 24,93% va 12,81%.
3. Budc dau de xuat mgt sd bien phap lam sinh nham day nhanh qua trinh dien the phuc hdi tham thuc vat rirng, dap irng nhu cau kinh te cai thien ddi sdng va mdi trudng trong khu vuc.
T A I LIEU THAM K H A O
[1]. Bd Ndng nghiep va Phat trien ndng thdn (2000), Ten cdy rimg Viet Nam. Nxb Ndng nghiep, Ha Ndi.
[2]. Hoang Chung (2008), Cdc phuang phdp nghien ciru qudn xd thirc vgt, Nxb Giao due.
[3]. Pham Hoang Hd (1993), Cdy cd Viet Nam, Montreal.
[4]. Nguyin NghTa Thin (2008), Cdc phuang phdp nghiin ciru thuc vdt. Nxb DH Qudc gia Ha Ndi.
SUMMARY
CHARACTERISTICS OF STRUCTURE AND NATURAL REGENERATION OF SOME FLORAL SOCIETIES IN KY PHU COMMUNE, DAI TU DISTRICT, THAI NGUYEN PROVINCE
Nguyen Van Tuong', Le Ngoc Cong^*
Tuyen Quang Department of Education and Training College of Education - TNU Ky Phu Commune quite diverse in the types of vegetation. There are four types of existing carpet and development here is: Ferest on soily mountain, secondary forest, savana, secondary surb.
The flora of the Ky Phu Commune (Dai Tu district , Thai Nguyen province) is quite rich in species composition. Have listed 216 species, 170 genera, 75 families of 4 vascula plant phyla;
Equisetophyta, Lycopodiophyta, Polypodiophyta, Magnoliophyta.
The characteristics of the species, density, distribution and quality of regenerated plants showed that the natural regeneration capacity in the study area tends to increase, should facilitate the process so that by means of technical specific silvicultural vegetation status to achieve higher efficiency.
Key words: Ky Phu Commune, vegetational cover, secondary forest, savana, secondary surb.
Tel: 0915.462404
