太行山低山区枯落物分解及主要营养元素变化  

Decomposition of Litter and Its Nutrient Dynamics in Taihang Mountains

作　　者：璩芳[1,2] 张万军[1] 刘秀萍[1] 

机构地区：[1]中国科学院遗传与发育生物学研究所农业资源研究中心,河北石家庄050021 [2]中国科学院研究生院,北京100039

出　　处：《水土保持通报》2010年第6期41-45,共5页Bulletin of Soil and Water Conservation

基　　金：河北省科技攻关计划"太行山生态稳定机制与生态服务功能研究"(07237106D)

摘　　要：应用分解袋法研究了太行山低山区枯落物的分解及主要营养元素的动态变化。结果表明,不同植被类型的枯落物分解损失率差异明显,表现为:刺槐林>薄皮木灌草>荆条灌草>草丛;损失率变化趋势与温度和降雨量变化一致。分解过程中,K,Mn,N元素发生净释放;Na元素有净积累;Ca元素先释放后积累;Zn,P与Ca恰好相反,元素先积累后释放。分解1a后,枯落物各元素总体释放率的大小顺序为:K>N>Mg>P>Mn>Zn>Na>Ca。太行山各种植被枯落物分解1a来元素归还量都以K量最高,Ca量为负值,各元素总归还量大小依次为:K>P>Mg>Mn>N>Zn>Na>Ca。太行山22a土壤养分变化,与枯落物归还量大体吻合。Decomposition of litter and the dynamics of the major elements in litter in Taihang Mountainous area were studied by using litterbag method.Results showed that mass losses of different vegetation types were different,which was in the order of Robinia pseudoacacia〉Punica granatum L〉Leptodermis oblonga shrub bushes〉Vitex negundo shrub bushes〉grass.The changes of mass losses during decomposition were consistent with temperature and rainfall.During decomposition,there were significant net releases of K,Mn,and N,while a significant net accumulation of Na.Ca was firstly accumulated and then released,while Zn and P were firstly released and then accumulated.By the release rate of the elements from litter after 12 months of decomposition,the elements were in the order of K〉N〉Mg〉P〉Mn〉Zn〉Na〉Ca.K had the maximum amount of nutrient returned in the process of litter decomposition,while the amount of Ca was negative.By the amount of nutrient returned,the elements were in the order of KPMgMnNZnNaCa.According to soil nutrient analysis,the change of each element content in soil accorded with the nutrient returned of litter.

关 键 词：枯落物分解 失重 元素含量 太行山低山区 

分 类 号：S718.554[农业科学—林学] X171[环境科学与工程—环境科学]