資源描述:
《長(zhǎng)白落葉松人工林細(xì)根生物量及其動(dòng)態(tài)研究-論文.pdf》由會(huì)員上傳分享,免費(fèi)在線閱讀,更多相關(guān)內(nèi)容在行業(yè)資料-天天文庫(kù)。
1、第38卷第2期南京林業(yè)大學(xué)學(xué)報(bào)(自然科學(xué)版)Vo1.38.No.22014年3月JournalofNanjingForestryUniversity(NaturalSciencesEdition)Mar.,2014doi:10.3969/j.issn.1000—2006.2014.02.034長(zhǎng)白落葉松人工林細(xì)根生物量及其動(dòng)態(tài)研究鄭金萍,范春楠,郭忠玲,楊保國(guó),岳龍,劉士玲(北華大學(xué)林學(xué)院,吉林吉林132013)摘要:以長(zhǎng)白山區(qū)30年生長(zhǎng)白落葉松(Larixolgensis)人工林為研究對(duì)象,通過(guò)根鉆連續(xù)取樣及分解袋埋藏法,對(duì)細(xì)根(≤2mm)生物量
2、及季節(jié)動(dòng)態(tài)、細(xì)根分解、細(xì)根周轉(zhuǎn)進(jìn)行了研究。結(jié)果表明:在長(zhǎng)白落葉松人工林生長(zhǎng)季,細(xì)根平均生物量為3.8257t/hm,其中活細(xì)根和死細(xì)根分別占84.51%和15.49%;0~10am土層活、死細(xì)根生物量分別占林地活、死細(xì)根總量的72.09%和50.46%;細(xì)根生物量隨土層深度的增加而減少。長(zhǎng)白落葉松人工林細(xì)根生物量在1年中有明顯的季節(jié)變化規(guī)律,活細(xì)根的呈雙峰型,死細(xì)根的呈多峰型。經(jīng)細(xì)根分解實(shí)驗(yàn)計(jì)算,長(zhǎng)白落葉松人工林細(xì)根分解系數(shù)k平均為0.0015,細(xì)根年生長(zhǎng)量、年分解量和年周轉(zhuǎn)率分別為1.5348t/hm、0.1450t/hm和0.47次/a。關(guān)鍵詞
3、:長(zhǎng)白落葉松人工林;細(xì)根生物量;細(xì)根分解;細(xì)根周轉(zhuǎn)中圖分類(lèi)號(hào):$718文獻(xiàn)標(biāo)志碼:A文章編號(hào):1000—2006(2014)02—0175—05FinerootsbiomassanditsdynamicsofLar/xolgensisplantationZHENGJinping,F(xiàn)ANChunnan,GUOZhongling,YANGBaoguo,YUELong,LIUShiling(CollegeofForestry,BeihuaUniversity,Jilin132013,China)Abstract:Thisarticlehadstudied
4、thebiomass,seasonaldynamics,theverticaldistribution,decompositionandturnoverofthefinerootsin。plantationofChangbaimountainfromMay2006to2007byusingthesequen—tialsoilcoringmethodandlitterbagtechnique.Theresultsshowedthattheaveragebiomassoffinerootswas3.8257t/hmwith84.51%livingfin
5、erootsand15.49%deadfineroots.Thefinerootsmainlydistributedinthe0-10cmofsoillayerwith72.09%livingfinerootsand50.46%deadfineroots.Andwithsoillayerdeepen,thefinerootsbiomassde—creased.TheannualchangeoflivinganddeadfinerootsbiomassinLarixolgensisplantationhadobviouslyseasonalvail—
6、ation.Thelivingfinerootsbiomassindifferentseasonvariedwithadoublepeakcurve,andthepeaksofthecui'veap—pearinMayandAugust.Theseasonalchangeofthedeadfinerootsbiomassshowedamuhiplepeakcurve.Theaveragedecompositioneficiency(k)was0.0015forrolgensisplantation.Netpfima~productivity,dec
7、ompositionandan—nualturnoveroffinerootsinolgensisplantationwere1.5348t/hm,0.1450t/hmand0.47timesperyear,re—spectively.Keywords:olgens~splantation;finerootsbiomass;finerootsdecomposition;finerootsturnover細(xì)根(fineroots,直徑≤2mm)利用其吸收表研究工作J,但限于研究方法的難度和研究對(duì)象面積,為林木生長(zhǎng)提供充足的水分和養(yǎng)分J,是的復(fù)雜性,致
8、使對(duì)細(xì)根生物量估計(jì)結(jié)果仍存在偏植被生物量中最為活躍的部分。以往研究顯示,細(xì)差,尤其是不清楚細(xì)根周轉(zhuǎn)量能否解釋陸地生根生長(zhǎng)量