间伐对侧柏人工林碳储量以及细根生物量和形态的影响  

Response of Carbon Storage,Fine Root Biomass and Morphology to Thinning in Platycladus orientalis Plantation

作　　者：李瑞霞[1] 彭婷婷[1] 刘娜[1] 王东[1] 闵建刚[1] 关庆伟[1] 

机构地区：[1]南京林业大学,南京210037

出　　处：《东北林业大学学报》2013年第5期34-38,共5页Journal of Northeast Forestry University

基　　金：国家林业公益性行业科研专项(201104075);国家重点基础研究发展计划(973计划;2012CB416904)

摘　　要：以徐州侧柏人工林为研究对象,分析了未间伐(55年生)、1次间伐(1998年,强度11%)和2次间伐(2005年,强度43%)对其碳储量、细根生物量和形态的影响。结果表明:①侧柏人工林碳储量的变化规律为,2次间伐(76.36 t.hm-2)>1次间伐(73.30 t.hm-2)>未间伐(68.54 t.hm-2),其中乔木层碳储量1次间伐>2次间伐>未间伐,土壤层碳储量和枯落物层碳储量2次间伐>未间伐>1次间伐,灌木层和草本层碳储量与系统碳储量的变化一致。②与未间伐相比,1次间伐显著增加表层土壤中2级根的根长、显著减小亚表层1级根的根长、显著增加表层和亚表层土壤中2级根的比根长;2次间伐后表层和亚表层土壤中4、5级根的直径变粗、根长变长,表层土壤中2级根的比根长变短,亚表层土壤中2级根的比根长显著变长。③与未间伐相比,2次间伐显著增加了1级根和亚表层5级根生物量,而两种间伐显著减少了表层细根生物量,亚表层4级根生物量和细根总生物量。④生态系统各层次碳储量与1级根的直径、根长和生物量显著相关,土壤层碳储量与4级根的比根长显著正相关,而草本层碳储量与5级根的比根长显著负相关。An experiment was conducted to investigate the effects of thinning on ecosystem carbon storage, fine root biomass and morphological traits in three different treatments, control, first thinned and second thinned Platycladus orientalis plantation in Xuzhou. The order of carbon storage for P. orientalis plantation in the whole ecosystem is second thinned plantation （76.36 t·hm^-2 ） 〉first thinned （73.30 t·hm^-2 ） 〉control （68.54 t·hm^-2 ）. The order in shrub and herb layer is similar with the whole ecosystem. While the carbon storage order in tree layer is first thinned plantation〉second thinned〉control, and the order in litter floor and soil layer is second thinned plantation〉first thinned〉control. Compared with the control plantation, in the first thinned plantation the root length of order 2 becomes longer in upper soil layer and order 1 becomes shorter in the sub-top soil layer, while the specific root length of order 2 becomes longer in two soil layer~ In the second thinned plantation, orders 4 and 5 become longer in root length. In upper soil layer, order 2 becomes shorter in specific root length, in contrast, becomes longer in sub-top soil layer. In the second thinned plantation, the biomass of order 1 and order 5 increases significantly in sub-top soil layer. While, in two thinned plantations the fine root biomass reduces signifi- cantly in the upper layer, and order 4 biomass and total fine root biomass reduce in the lower soil layer. Root diameter, length and biomass of order 1 have significant corrections with different ecosystem carbon storage. Soil carbon storage is positively and significantly correlated with specific root length of order 4, while the carbon storage in herb layer is negative- ly and significantly correlated with that in order 5.

关 键 词：侧柏人工林 碳储量 间伐 细根 生物量 

分 类 号：S718[农业科学—林学]