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Luận án phó tiến sỹ Một số đặc điểm sinh thái học rừng tre lồ ô Tài liệu tham khảo tóm tắt Luận án phó tiến sỹ khoa học " Một số đặc điểm sinh thái học rừng tre...
a6 f)~1 HOC vA TRUNCHOC CHUVtN NGHltp TRt1'iJ'NG B~I HQC TONC RQ'P TP. Db CHI MINH ~ c Au QUANGHI~N MOT' SO DAC . ~ DIEM I . SINHTHAI HOC RUNGTRE LO6 (Bambusa procera A. Chev. et A. Cam.) '-A "'- A MIIN DONG NAN I'Q Chovan ngonh: SINH THAI - Me IE;t 01 . 05 -10 TOM TAT LU!N AN PHQ utN 51 KHOA HQC -" '-' ' ._\ r~\~\i\-\/,:.J('.' ; ~\!~ \~ ! , . . ~ " I \ l- I THUii':"j",C ~II.~L,r \ . - . ~".j ! > " \ \~,~ tH.i.NH PH6 HO CHr MINH 1987 luOn an dirge holm thanh IQi B9 men Sinh moi, Khoa Sinh h9C Tnrbng 9Qi hQcTOngHgp Thanh ph6 Hd Chf Minh. NgU'c7ihU'ang do, khoa hQe; G 5 T5 PnUNG TRUNG NGAN NgU'bi nh9n xet I: Ngll'ai nh9n xet 2: Ca quan nh9n xet: luQn an s~ dU'gcb60 v, tQihQidong ch6m luQn." Nha nU'6'e hQp tQi Twang 9Qi hQc TOng Hgp Thanh ph6 He ChI Minh vao Iuc: ngay thong nam Co th~ Jim hiAulu9n an IQiTnU'vi'n. l2i¥i " ,. ntJt ldu C'-hiemd'~n ti.h haft 150. 000 ha tQi mi~" Dong N"m b~ rung Tre ll) 0 hay r&"g Ll) 0 vva la ngubn nguye" li~u quaM Ir9ng cho (6ng nghi~p gilSy va li~u th~ cong m9 ngh, xu6! khltu vuo la d6i t"Clng nghi@n c60 khaa hQc 19 thu v~ cae qui luSIf linh thai hQCc~a rung nhi~t d61. Hi;n toi, ,ung Lb 0 da va dong bi khoi thae m9t e6ch tvy I.," (khoi Ihac Irllng;"cf61 'ling lam r6)', 16y mOng bira bai , pen di;n '!ch, eh6t I"Clng va khc!JpOng tung c6p li&n tye cl1a ,irog bi gic!JmtU~ m9t each nghiem I'Qng. &~ phye h6i v'n 'ling, pong coo pOng ~y61, eh6t luClng ,irng, vi,c lien hanh "hOng nghien ccrucac d{Jcdi~m sinh :hai hQc lam ca .6 khoa hQc cho vi,c knoi Ihac va .{, dyng hap Iy lai "guyen 'ling ll) 0 la van dli "hel SUCc6p thith. , . ~, ~h~n mqt: TONG QUAN VA PH(ftrNG PHAP NGHIEN LUU ChU'ang I i llCH Slr NGHIEN c(ru RUNG TItE lO 0 MQe du 10 loai T,. qUO" IrQng nhlll Nom bQ, nhU'ng tho den nay, cae c6ng I,inh khc!Josat rung lo 0 con quo tt va chi mai t9P trung vaG cae khia cQr,h: Phon 10QIIhY'cv9t (lecomt. M. H, 1912: PhQrn Hoang HQ, 19721, dleu Ira hi,n trQng loi nguyen rung (Vi,n dreu Ira qni hO9Ch rung, 1983), chIt bien b~f gi6y fir lo 0 (Chou CY'Xu, 1964; Nguy~n YOn Hlen, 1973) k9 thu(ltlam sinh (ly ThQ, 1979; lam Xuan Sanh va Chou Quang Hi~n; 19d4) . . va ch"a co tong lrinh nao khoo lal khfo cQnh .inhlh6i h9C cuo rCr"g. . NnJn chllng, cae k~t qua hi.n co con fU'ang d6i sa 1U'(jJcVO to nhi~u di~m chU'a th6n9 nh~t nhou nhU' xac dinh ten khoa t;9c, ki~u sinh "U'CIn9cua lo 0, cae (hi tieu k9 Ihu{ll cuo phU'ang thCrech{Jt cl,Qn '" dOng thoi con nhieu vaQ d~ co bon co y -2- nghta quon frQng ct6i vai vi~c sUodvng hgp Iy lai nguyen rllng lO 0 nhu d{1c di ~m hinh Ihanh, dien fhe, sinh kh6i, nOng suet rllng chua dugc khoo, s6t. Ke thlro cac ket quo da dQf dugc trong c6c nghien CIlU truae day, mi,leHell cua lu?m qn, nay la du-(j'igoe dQ sinh thai hQC,ti~p tve di§u ha thY'C Ie g6p phan khao sat mQtso d{1c dit\m sinh thai hQe cua fling ,Lo 0 mien' Gong Nom BQ la~ co sa khaQ hQCtho v!~c de xual phlfo;lghuang,khoi th6c va nljOj ClU'angrl/ng mC}teach hgp Iy hon. '. ,.~ ~ " Chuang 2: NQI DUNG VA PHUONG PHAp NGHIEN CI1U I'~' NQ1' DUNG' N,GHIEN CI1U: ' Can ell vaa myc tieu eua lu{m 6n va cae chi dan cuo UNESCO, UNDP, FAO, 1978 ve nghien CIlUh~ sinh thai rllng nhi~t d6i vaa dieu ki~n cv th~ (UOflIng Lo 0, cac n{li dung chinh duge l{tp trung. khco sol Irong ju{tn an nay la cae c{1c diim hin'h th'anh, dieMIl1e, sinh Iruang tau Irue quar1 thi, uac tfnh sinh kh6i va nOMa suat cuo qUaM thi to 0 trang dieu kitn phat tri~nbinh Ihuang hoy du6i lac dQng cuo con nguai. Trim co So' do de xuat mQt y kiin ve bi~n phap k9 thU91 khoi thac va nuoi duO'nghgp Iy lai nguyen rll~g Lb 0 de Ihiet th"c phvc V;Jsan XUaf. ' I I. PHUONGPHAp NGHIEN ClrU : I) Phuong phap luQn: 9§ gici quyet mvc tieu va nQi dung nghien ciru neu Iren, phuong phap luQn ng"ien CIlUd{11'co sa fren, lu{m diEim 4:sinh thai ph6! sinh quan the ~ \Thai vOn Trlrng 1970) vQn dvng vaa dieu ki~n cv Ih~ cuo flIng La 0 la mc?t quan th~ thll sinh, co eeJutruc (dc}ng:. va hang nOm rlrng tei sinh vo tinh bang' each sinh mOngoXual ph61 tll cac d{1etrung nay: - Vi~c khoo sol d{lc du!m sinh mOng da dugc chQn nhll 1a di6m, ehu y~u xuyen qua toon be?luQn an d~ khoo sat "dc}ng thai" rlrng Lo 0 vi d{1c diem sinh mOng dong voi Iro quan tr9ng trong qua tdnh hlnh thanh, xu hl/ong dlEtntho, kilo nelng ,-,3'~ ,p.hyc hc!,)i,,s,!b4en d9ng vl! sinh kh6i, C(]U'ru~/nOn; sueSt ,.Q)'a Clu~n 1,116,1.:0O. . .:' ~'e~ .ih~ h'i~n voi fro cua con ngU'oi trong qua trinh diAD Ihe Ill'" sinh, tong lac Ihu nh9p so li~u Ihl{e te da dllge b6 tr; "h~o. phuong Ih,(reva m(rc d9'aC d9ng cua c.on ngU'oi, ap dvng phllOl:19 pnap sinh. thai hQCso $anh, phuong phap. suy dieD . Clements, FiE, 1916) d6 nhQn dinh va phan tich kat qua. ( 2) Phuong phap thu th9P va xli Iy s6 h9U: . 'Con9 tac'tnu IhQp sO li~u IhY'c Ie da dllqe lien hanh ireU caekhu Vl/Cphon b6 chinh cuo Lo 0' mien &ong Nom 89; Phu6c Long (560g Be), Vlnh An (&on9 Nol) IU- 1980- 198:>va eJieu tra bO sung tQI Nom Cal Tien (&ong Noi) tu- 1980 - 1987. &6i tl/gog va phQm vi, khao sat 16 cae qUaD Ih6 Lo 0 a cae trQng thai rung ma Lo 0 chiem I/Uthe (0 r~t 1rong to thanh rtlng -10 cae khu Vl/Cdang kinh doanh J<Jnphbm chinh 10 Lo 0- boo 90m IrQng Iha. ru-ng Lo 0 10 gia " (nhll cac trQng Ihal r!)ong La 0 xeD go, Lo 0 thuon 10QI, hinh thanh Itl lau dong phat tri6n dn dinh, chuo bj con ngllai liep lye tat d9ng) ,va cae tr~mg thai rllng Lo 0 "phvc h6i '0 sou khi bj khoi thoe trtmo hoQe lam ray dang a cae giai do,:," phye hoi khae nhou IIi I den I nOm. Tuy nh!en, d6 11mhieu ve nguon g6e phat sinh rOn;, , dQc dl6m taU Irue va tai sinh cuo cae Ir Cong Ihai ru-ng go nguyen sinh (dl~m Lo0), ru-ng go xen Lo 0 eOng da dll9c khao sat. . . V6i Illng n9i dung, da ap dvng cae:phuong phop thu IhOp i6 li,u Ihkh hqp; - - Qo.o tdnh dieD the d<;tcdl6m eau Iruc q\J~n xa rung, ea",tru, quan th~ Lo 0 da dugc dieu tro Iren 54 0 lieu 'chu{1O (O,lho) theo phuong phap 0 lieu chubn (XUCOSOVIv. N, 1957; Thai Van Trung, 1970) ket hgp v6i phuong ph6p ve bi~u do phau di~n (DavIs, T. A. W va Richards, P. W, 1933 - 1934). - Hinh Ihoi vo .sinh Irvo-ng cua Ihan ngam, mOog, thon : 4- khi sinh, hOd U> 0 dU',?,ekhao sat va me ta (theo Ueda,-K, 1960; Le Nguy&n, 1971; Tran a(re HQu, 1985) bang each :d'c2o goe than ngam, rhea dCii $1/ sinh mOng trong suot mu~ mU'o nam 1982. . - Sinh khoi va nOng suet fling dU'gc thu th{lp theo phU'ang phap ffcay tieu chubn blnh quon If vQndvng cv th~ vao dieu ki~n rli'1g ld 0 tren 16 e 'tieu chubn 0,1 ho (Kiro, T. va CI", 1967; Crow, T. R. 1971). - Tinh chat hoo hQccuo dat, than khi sinh, la, vQt rvng ite 0 dU'ClClay mcwva phon tich tQiVi~nKyThu(1tNong Ng~i~p mien 90ng Nom Bova TrU'cm99Qi HQcNOng lam thanh phiS -He Chi Minh. . . . &~ dam b~o mllc d9 tincQY can thief tho cae nhQn xel, ket luc}n, phU'Q'ngphap thong .ke sinh hQc da dU'Clesli d¥ng ,!rpng vi~c xay dvng cae phU'O'ngtrinh hei qui giO'o kich thU'C7c :c:,o<:t:l9 phon, 'Ii\}9 kkh thuoc va trQng 1U',?,ngtheo cae chi don :S:U.oOgowa, H va elv, 1»61, Sobhosri, S. va ctv, 1968. Tuy nhien ~9C phU'O'ngphap quon sat, mota van dU'Cle IIi dyne khi can t:,j~t, . . Phttn hai: KtT QUA vA 'IRAO LU~l"J ~I :' . " '" , " , . - " . .t ChU'ang 3: e~c alEM HINH THANH VA XU HlJ'ONG DIEN THE I. Hocn tanh sinh thai khu vve phtln be cuo Ld 0: (; mien &ong Nom B91fling Lo 0 phon b6 tren m9' khu Vile r9ng Ion, d{1c bi~I tQP trung thanh /I bi~n Tre II a huy+n PhU'acLong(S'ong Be), VTnh An (&6ngNai) va rei roc han a Nom Cat Tien lBong Noi), Khu vl/c phon bo cuo Lo 0 a coo d9 100 - 450m. dio hin'" d9ng doi thap den doi coo, khl h9U nhi~t dai gio muo -5~ ; , ' "v6i "T~ 25,2°C, h)'<}n9 mlla coo P = 2059 mm,v6i90% tOp frung vea muc: mllO (thong 4 - II), muo kho ng60 haD (chi '"i6 ThQi Van Trling X = 4.2. I), Iren nen d6t ,feralit n6u do no,u ,vang fren do bazan, feralit xam Yang, vang do tren phien thQch.la cae 10Qidat co fang d61 sau (> 60 em),' Ih06tthuy ; ~6t, khong ng9P veo mua mlla. Cae quan sat thl[C Ie eho thay va phon be, co 51[ phon hoa ro r~t glO'a La 0 va Tre Gai (Bambusa orundinaeea willd) cOng la m9' loai Tre quan IrQng a mien &5ng Nom' 69: ,Tre Gainlhuang Xval lii~n a nai thap, dOl b&ngven song su6i, d6t .xom trim granit thllong bj ng9P lap xap vao mug mllO. SI! khat bi~, ve yeu cau sinh thai nay can dU'<}cehll y Irong qui hoQeh vung ehuyen eanh cho m6i loai. ' Cae dieu ki~r1 sinh thai nau fren chi mal eho Ihoy 'dQe di~m cOG khu vl{c mo Lo 6 co kho nang xam chie" va !no rc}ng di,n tich/la tien de can ,hie! -IlhU'ng thtra du gioi thie, 51{plio!" 5i'nh ,mc}t di~n tieh rCrng Lo 0 bQt ngan n;,ll hi~nIQi. Hori 'nO'a' th'r,~h 'ling vOi dieu kl~n$inh thai -nau Iren, thom Ihl/'- Y91r~rig nguyen sinh a day' 'do /0 rlrng dm thvong 'xa'nh mva mu~ nhi~t"dal .v6'i SVI1Uthe'cua looi cay go hQDau (Dipteroearpac'eae",rihU' DCiu ,.J6 bong (Dipterecorpus t,vrbinotus Gaertri.l, Saoden (Hopeo :'Qdorato Roxb.) a fang vuql ,einh~n gluo v6i cae loai-khai;;~hU' ,H'uynh ITarrietia ;aYOniCa 81.) Cay Jrvingia maJoycino Oliv~), Lirn50ng (P ltophoru:n da5yrachis KUiZ), xen Ian m9t It 1001 'Jyng fa mua kh9 nhU' 6ang Lang (Lagersfroemia' sp.) '. 'trongdo,o 51{hi~n d'4n ,uo to 6 du6i Ian rCrng nhU'ng ,phon b6 roi la"'56ng "khiem 16n"ya voi tro hau nhv kh6ng ; d6ngke. KIC~urllog nguyeri sinh noy hi~n fQi con hi~n di;.n filng mong di~n lich nhe a Bu Gia M9P (Song Be), Nom cat ,'TIEm~\aoog Noi). Nhll the, co th~ nEw gio thuyet r&ng d~n tich bQt ngon cuo Lo 0 hl~n IQi co nguon g6c tCr Lo 0 Irong .rllng gO,nguyen siph va qua tlinh hinh thanh, dien the CUD chung lah9"' quatac d9ng cuo c)n ngv6i den thorn rCrng [19~yelJ.s:nh :~ khl.!vI/' nay. -"!'"6.!!!!. , " II VAITRO CON NGU'al TRONG SI! HiNH TH~H VAl ,: OIEN 'THERUNG: nRClng Lo Ohinh thanh U, rClnggo nguyensinh J Tac d9ng d(ju ti.en va tren qui mo Ian tu- XQxU'a den ruftg nguyen sInh hi ,nc;m-ph6 rlinglcim ray cua dong boo dan toe Stieng :va- s(jn day (hI 1960 den nay) la anh hU'ung n{lng na, cOo chat d9c hoa hQc cua de quae M9 va vi~e khai thac ru-ng bU-Qbai theo .hU'ang lay di cae cay go qui cao to va chlio IQi CCf:,cay kern gia: tddU'a den hQu qua 10 r~n9go bi va. .tan va ngheoki9t d(jn cae loai go quI. Trong hoan canh sin!' thai mainay. ,10 ; 6 vbi nhilng d{lc di~m cua m9t loai ti€m ,phone, U'a sang, cco diau kitn xam chiem khoang Ir6n9 b&ng co 2 con dU'ang vo vo tinh Idn,hilu tinh: HQtLa 6 (n&m sOn trong dot hoCjc dU'qe phat tan tu- noi khac den) 9CjP dieu kit". thu~1nIgi sanc!ty mom de dang bien thanh cay con, Tu-cay con nay hang nam mane dU'gcsinh ra hinh thanh cae the h~ ke Hap d~ saucvng thanh byi Tre La Q. 1uy theo mCrcd9 lam ray. khai quong, khaithac va va tan cua ,(rng go ma freonthve te, co th~ 99P ~hi~u trc;angthai trung gian v6'i cae mCrcd9 U'uthe khac nhau cua cay go va ~a 0 thee hU'6'ngLa 0 hoa rung g6: rClng g6 )Cen ~a 0, ,Clng La 0 xen go, ru-ng La 0 thu(jn loc;ai. '. Khao sat lap cay tai sinh a cae: trc;angthai rClng nay cho th6y khi cay go con U'u the- so vai Lo - 0 (rung g& xen Lo~O) ,thl lap cay go tai sinhphong phu (2800cay (> Im)I he) thu9c cae loai :Dau la bong, Go mQt, Binh linh; B~ng lang, Cay, Tram, TrU'ang,Long moog, BCra.Co k6 ' co kha n6ng chan) IQi fifth trQng va tan va tiep fve giO'vai fro U'u the d6i vaiLo-o NhU'ng khi Lo- 0 da giD' vai Iro U'u the (rling L~- 0 xen g6' . , fling La. 0 thubn 109i) lap cay gO tei sinh it hoi)etrung binh 'tit 00 - 1600 cay> Im/haJ phbn Ian IhU9C c6c loQi g6 nhe I long mang, Co ke, Thanh ngQnh, Long ,mCre,56 ". nen tri." v9ng phyc hai loi 51f U'Uthe cua cay go ta di~u kho co th~ xay ra. Qua tdnh hinh thanh rling La. 0 Iii g6 thee hU'l1ng Lb. & hoa flIng g6 nay ch6c ch6n to qua trinh tau dai, c6 5V cQnh tronh d~ gianh U'uthe tling IUt,t,,"S ngi tUOcay g6 hQ9C La .'Q. "'~~-'7- 2) R\rhglb. 0 hinh thanhtren dat visn 10 euar&ng lb;, 0& Sou khi hin; thanh tll fling go. cae trQ'Igthai rl1ngLo-0 (Lo-o .en go~ L) -6 tnuchl 10Qi ) IQi tiep t c bi toe dgng bol eon! ngU'ai: pbarl1J1g Lcho lam ray, khai t~hQc,rang,L9~ 0 $au khi; bi tac d9ri9, do khlJ "nang lai sinh vB tj~h monh mi§,than ngam' Lo- 0 van liep t c dam choi sinh mans hinh thanh . cae trQng thai r\rng Lo- 0 "ph e hoi" sou ray, sou khoi thae trang. " \ r\rngphve hoi, vai!ro U'u thecu-a Lo';"0 doi .vai cay go tang 'r~r,t vi lap cay 96 lai sinh 0 day kern phong' ph" va eh'- y6u van Ii] cae cay go nho (long mllc, Co ke, Thanh ngonh) thCrsinh mQcx.n vai Lo. 0, . So v&i qua trinh hinta thanh r\rng Lo. 0 l\r rl1ng g6 nguyen linn ,thia 'noj,vanda dat f\rng Lo-6 slf, hinh thanh (phvc ~Oi) n;n9 Lo . 0 diinra de dang va nhanh . chong han do da c6 16n h, thong Ihon ngam va kha nang tai sinh vo tinh niQnh mi cuala 0.' . " m9t GOnoi bi lam ray lien Ive, dat bi thoaihda. mQnh .ml th80 hU'anggiam'd9 ph'" chua va Latedt hoo tQo dl~u kiin tho'cae quan th6 Co IranI'! (Imperalo cylindrica (Lj P.'Beouv) Co my (Penniselum polys'achyon (L)Schul1.1xam chiem va thay ,he Lo-O. , , . Nh9n dinh chung ve d9C df~m hinn ,r,'anh va diin Ihe 0 ",n9 La- 6 cho Ih6y: '. - Rling Lo .0 dU'qc tac d9ng .16ng hgp cua cae nnan t6 tin~ thai: cac nhan '0 'V nhi~m (dia hinh, khi h9U, dot, h, thvc 'vqL ) 10 tien de can thief, con ngl1Olla nhan to t90 ,hoen eanh va kha nang tai sinh (hi:rutinh va 'vo tinh) cua to. 0 10d9ng Il{ccua qud trinh nay. - Bay Ie qua ,dnh diln the ch+ch hU'ang.do riguyen' nhan inh v9': Khi La- 0 eta xam nh9p va chiem U'uthe 'rong t. thenh fling thi cay go kho co kh6 nOng phve hOi IQi vi Iti U'u Ihe cuo no do kha nang tei sinh vo tinn mQllhme cOO lo. 0 da 16nat. ",'Mqc du 10I ling thli ~mh, tinh 6n djnh LUOf"ng/a 0 rat eGO trongd.eu k"n bj Ci'.9t'rang, lam I at, chung van c6 kho hOng phvc-hoil9i nhahh chong bang con dU'ong~o tinh, &iy Ie d{tt: -':~- : d6im 46ng ,qui" n~u b16t (;)I't kinh doanh hgp Iy th1 s! duy tr1 , kha n6ng nay giup rO'ngdQt n6ng lu6t ca~,. h9n ,ehe qucltrinh "trang co hoa r&ng I~ o. ' , " _.' ~;: , CBU'O'NG 4' r BIND THAI 'VA SINH TRU6'NG I liJNH THAI I . , , , ' Ket quo ph8n tich cae mau than ngbm, than khi $:in~,16, hoa~ LO0, thu th9P a PhU'acBinh, Dakta, Bu ,Gla M9P~ Vtnh .','An,' Nom C~t Tiencho th6y lb 0 d6i tU'gngkhbo sat eua lu9n , an nay c6 cae dQc di~m sou day: , ' , Than ngem mQc eym, krch thU'aG coo 13- 15m, dU'ang kinh 7 - IOem, khong gai, 16ng bQng, vach moog, tQi b, la C«Silong :~ trllng dai, mo Dang co toi khans phat tri~n,gie boa hinh'ov~1 , I)hQn d~p mang 5 - 7 hoa tfmtrong do co3 4hoa thy', e6 lei nhO'ngdQc trU'ngcua loai BambuM procera A. (her ,et A. Cdin, da dU'gcLecomte H 1913 vaPhQm hoang H9, 1972 mo la, Cac d{lc tning nay khac ro r~t (n"61 la hoo) vat loci Schizosta6h- . gum idllingeri Steud cung c6 ten dia phU'ang 10 Lb0 Igi~ho,a hinh try, manh, I hoc Thy), ' . II SINHTRUONG: I) &Qc'diim sinh mang: " .",. Si:nhfru'c,Ilg.cliathanngtlm: Than ngum lb &sinh trU'ang ,thee ki~u;hqp' trye va than ngam mai dU'ge sinh to chu yeu tl>' "Jhan ngem cay'm~ I n6m tubi. Net d91 s6c eua than ngamLo a '1'0co' kIth thirae kha dai (50.80em), dam hoi nghitng xuong d6t trU'flakhi cong liD ra khoi d6t Ihanh mOng(gan gi6ng nh" loCal ,Melocanllab(!-lnbusoidesTrin, a An d9, do d6 Cae than khl sinh trong bVLLIS,0 khong mQcsat vao nhau nin chU'a thay xoy ra :-hi,n tU'gf1g<nang bVi), eay la Iqi d,~m coo,L6,0 v~ mQtkinh, doanh r~ng, - ani'ng Lo6 «ria) : Than ngem co sinh trU'ang- 60 djith, -m~i Ihonngem m~ ,inh ra 4 - 5 than nge,m mai trong dti c6 I ,than ngem mai e6 kith fh.,,6'c w'ong dU'ang than ngem m~ " 'd c::::4.5. em) ph~t trieDthanhthan, khilinh '&oikhLc6 hi;n [...]... che s6 11I9ngmonS mal sinh hcmg nOm - RQ-ngLb-6 phvc hoi sau r6y ho(lc khai thee ,,6ng c6 "'9'"9 mOng sinh coo, kith thU'oc nhi>va co xu hU'ang phyc hbi IQi trQng thai rling La-0 gia sou 7 10 nOm Co 2 trQng Ihai deu khang phai 10 c6u true hqp Iy S) Tubi thanh thyc tai sinh cua lo-a: tudi I, 'ubi thanh thyc cong "gh, : tUdi3, ludi fh9 : S 6 ~226} M9C'du 10 tu-ng thl! sinh co sinh kh6f thap (BO-a51Ian/ha)... J~ IlnhtrQFI~r6'1)9 t ~1:7 -sinh' khcSi they dOi theo nOm phyc hoi fir 46,8% I nOm:t11(,nhat d6n63%1 nOm thCrboy treng do tir nOmther IV ha di m&, b6t dCiuco cay du tleu chuan khoi thac Sinh kh6i kho thac tOng d.ltn.vao cae nOm sou: 15,79 tan / ho I nOm thIS nOm; 21,45 ton1 he nOm Ihli boy ohU'ng van con, thap hc," nhiEh;lo\lai rirng L~ 0 cgill) 0 - Qua Idnh phvc hoi t6n9 sinh kh6i quCin the La 0 phyc... 7.01000(11 phvc hbi 11 I~ sinh kh6i kho thae trim 'Jnh kh6i than khi sinh kem 0 vo chI sou 6 nOm (32,7%) mal co th6 dU'o r!)ng Ira IQi khoi thac dU'gc ' Nh{ln dint, chung ve d{Jc diem linh kh6i quan th6 La 0 tho thay : So vai h~ linh thai rlrng mU'o nhi,t dai co t~nglinh kh6i {phon'lren dot} 290 tan / ha, sinh kh6i quan the La 0 kern - han ro r,t the hl~n qua trinh diAn the thli sinh thoai hoa fIr rirng... ph",!;: hbj' , , K,et qua tren"cho th6y, m{lc dusinh kh6i cling Lb a,thO'p nhU'ng nong suat kha cooichi kern fling muo xich d6i (29::',3.2, t6n I tla lnom), honbOn rung lim ban thay la( 1316n/ ~a I nOm), rCrn9 f199P m~m (9 ton / tlo / nOm) va, tU'ong dU'ong voi cacki,~ 'ling tre true nhi~t doi khae (16.20 tan I ho I nOm, Rozanov, BoG va LM Rozanovo, 1964) 2) Suo tIch IOy va tieu giam sinh kh6i: Hang nOm,... nguyen Iy sinh thai cuo ph"ong therc ky thuQtI Can cli vao cac dQc di~m sinh thai hQceua rllng Lo 6 nhu- da phon tlc~, m9t ph"ong thlle khai that va ""oi duCtng hqp Iy flrng Lo 0 phai" baa dom : - Duy tri d"9c kha nOng sinh mOng voi chat I"qng 16t CUG byi '- Bae v~ cf"qe mOng «ong) cue 'IV chinh dA dam bilo loj Ian XUaftoi nguyen flIng - Giai quyel mau thuan g;O'a so lU'qng '10 kkh Ih"oc Ihan khi sinh, ... Rling La 6 la rling thCrsinh hinh thanh Iran khu v'lc vung dbi, dot sau, thoat thuy, khi h9U bm, ph an mUG trong di~u ki~n con ngU'ai lam vo Ian rling nguyen sinh (rling lim "'"0 mua hQ Soo, Dau) theo qua trinh diln the ch,ch hU'ang J Lb 6 haa r\)ng go va khi da hinh thanh thi linh On dinh cua qu~n th~ La 6 rat coo do kha nOng tai sinh vo tinb mQnh m! lua loai nay.: 2) La 6 sinh trU'ang theo kiau hflJp... (ct{lcbitt ca cuan; than ngam dai) MOng Lo-osinh vao mua mila (thong 6 9), co tha phan bi~t 3 de;,", mOng (6ng, cu, nanh) va 3 vy mOng (lam, chinh, muQn) trong da mOng 6ng tua vy chinh 10 II/c IIIq"g chu yiSu bao dam tac sinh ,ling Thai gian d~ mang sinh trllang d'" hoan bjkich fhU'ac 10 80- IDa ngay S6 IU'tI'ng va kith fhU'ac mtlng co quan h~ ch{lt the vai cay tudi I trong sinhmOng va cay tubi 2 trong cung... phat ti-i6n- thanh th6nkhi sinh ft (900-1 QOO mang! ha) nl-,"-19 mane c6 (,6p' kfnh 'U'anl duang nhll cay m, (7 8cm) Trai IQi , a rOonG phvch~1 l\lqng' mong sinh ra kha coo vao nam th(r nh6t 15000,~ d()'\O, manS 'he) va t6t (lJ,-d~u phat tr;~n thanhthan khi sinh nhung taCmangnay c6 kich thU'ac kern (I 3cm) Vao cae nam'scui - ,6 1U'9"9 mane mane phat tri~n Ihanh than khf sinh Siam d~n (ung "tri s'l... thuyltn t" sv U'uthe cua cay fobi non sang coy thanh thyc, nghTa Ia tien don den trCjlng thai 6n d;nh nhll r\TngLo 0 cgia) Chtrang 61 SINH KH61 vA NANG SUAT , I SINH KHOla I ) Tr9ng 11I9ngkho c6 th~ L~ 0: T'909 1119"0'e6 th~ to 0 bien ,hlen theo tubi Ian dU'ang kin" than khi sinh tl) I,2kg Ilubi I / cap kinh I den 22,5kg I tuoi 3 / cop kinh IX Theo lu6i, is c.ung m9t cop kinh, trqng 11I9n9thop nh6t a tu~i... v6icanh.,14.~%#lo9,4!()/Jbqn ngem 11,2% trong do 'sinn kh6i khalhoc 10 30,21' 'fari/flo chiem tl I~ dang k~ (55,8%) 50 Val sinh khoi than ~h(,~inh , , "'" ' " ,' ~"i; ;.~ S.,Q~~~i bikhoi, Iho~trcmg, qua ' lrinh.phvchQikic;h;lhU'oc '~dn9 10Ru'o'JrjT\O'phVC hoj sinhkhoi c~o qu~nlh~ too :',IQng 'sinh kh6i.q~an Ihe Lo 0 long IIhqnh Ih8,O cae 110mphvc.:hoi tv :n'Om.IhU"nh6tl,O,59 tpn/hQ'den n.am IhU't\J 62,83tori/ho . SO DAC . ~ DIEM I . SINHTHAI HOC RUNGTRE LO6 (Bambusa procera A. Chev. et A. Cam.) '-A "'- A MIIN DONG NAN I'Q Chovan ngonh: SINH THAI - Me. sa fren, lu{m diEim 4 :sinh thai ph6! sinh quan the ~ Thai vOn Trlrng 1970) vQn dvng vaa dieu ki~n cv Ih~ cuo flIng La 0 la mc?t quan th~ thll sinh, co eeJutruc