摘要
研究了川西亚高山人工云杉林不同间伐强度后土壤有机质、易氧化碳、微生物量碳、有机质氧化稳定系数及其碳库管理指数,结果表明:对照林(0%间伐强度)土壤有机碳、碳氮比、微生物量碳、有机质氧化稳定系数均为最高,不同间伐强度下均有不同程度的降低;30%间伐强度林地易氧化碳含量显著高于其他林地;与对照林相比,10%,20%,30%间伐强度林地0-10 cm和10-20 cm土层土壤碳库管理指数(CPMI)分别提高了58.22%和182.90%,108.16%和176.28%,128.44%和221.61%。林地间伐抚育措施具有加快土壤有机质的分解、CO2的释放以及增加有机碳库更新速度、促进土壤腐殖质形成,同时导致土壤有机质稳定性降低的双重性,因此可以以中度间伐强度30%作为川西人工云杉林的间伐强度参考指标。
Spruce is the key constructive species in western Sichuan and plays principle role in soil and water conservation and other ecological functions in the upper reaches of Minjiang river.We chose permanence sites and then designed thinning experiment in 2002,and investigated soil organic matter（SOC）,readily oxidizable carbon（ROC）,microbial biomass carbon（MBC）,oxidation stability index and carbon pool management index in spruce plantation with different thinning intensity in 2009.The results observed that,comparison forest（CK,0% thinning intensity） contained more SOC and microbial biomass carbon（MBC）,higher C/N and organic matter oxidation stabilty coefficient（Kos） and carbon pool management index（CPMI） than that in those spruce plantation with different thinning intensity.Compared to CK,the 30% intermediate cuttings intensity contained more readily oxidizable carbon（ROC） than other groups.CPMI in 0-10 cm and 10-20 cm layer of 10%,20%,30% intermediate cuttings intensity increased by 58.22% and 182.90%,108.16% and 176.28%,128.44% and 221.61% respectively.Therefore,the measure of nurturing intermediate cuttings might be accelerate the decomposition of soil organic and increase the update rate of organic carbon and promote the formation of soil humus.
出处
《水土保持学报》
CSCD
北大核心
2010年第6期127-131,共5页
Journal of Soil and Water Conservation
基金
国家"十一五"科技攻关支撑项目(2006BAC01A11)
四川农业大学"211"工程双支计划
关键词
易氧化碳
碳库管理指数
氧化稳定系数
抚育间伐
readily oxsidizable carbon
carbon pool management index
oxidation stability index
intermediate improvement cutting.
