摘要
以西藏色季拉山急尖长苞冷杉林Abies georgei var.smithii为研究对象,运用典型样地调查法对林下粗木质残体进行调查,采用5级腐烂系统对粗木质残体进行分等定级,测定有机C、全N、全K、全P、Ca和Mg 6种养分元素含量,分析C/N、C/P及N/P比值。结果表明:各腐烂等级养分元素含量及养分储量均表现为有机C>Ca>全N>全K>Mg>全P;C/N、C/P随粗木质残体腐烂程度的加深逐渐减小,N/P则是从Ⅰ至Ⅲ级逐渐增大,Ⅲ到Ⅳ级突然减小,之后又开始增大;在不同类型粗木质残体上,南坡养分总储量为49 164.8kg·hm^(-2),高于北坡的34 846.19 kg·hm^(-2),且二者均表现为倒木>枯立木>树桩>大枯枝。
Typical sample plot method was usedto investigate the coarse woody debris in Abies georgei var.smithii forest in Sejilamountains,Tibet.With five decay classification systems to classify and grade coarse woody debris.Nutrient elements concentrations of organic C,total N,total K,total P,Ca,Mg were assayed.The ratios of C/N,C/P and N/P were analyzed.The results showed that Each decay class nutrient element content and nutrient reserves are as follows：the organic C Ca N K Mg P;C/P and C/N are gradually decreased with the deepening of the degree of decomposition of coarse woody debris,N/P is gradually increased from Ⅰ to Ⅲ,Ⅲ to Ⅳ suddenly decreasing and then increasing;on different types of CWD,the southern slope of nutrient total reserves of 49 164.80 kg·hm^-2 higher than 34 846.19 kg·hm^-2 that of the north,and the two are all shown as：logs snags stumps large branch.
作者
马豪霞
任毅华
郑维列
MA Haoxia;REN Yihua;ZHENG Weilie(Research Institute of Tibet Plateau Ecology, Tibet Agricultural and Animal Husbandry University, Nyingchi 860000, Tibet, China;Tibet Key Laboratory of Forest Ecology in Plateau Area, Ministry of Education, Nyingchi 86000, Tibet, China;National Key Station of Field Scientific Observation ＆ Experiment, Nyingchi 860000, Tibet, China)
出处
《中南林业科技大学学报》
CAS
CSCD
北大核心
2018年第1期106-110,共5页
Journal of Central South University of Forestry & Technology
基金
西藏自治区自然科学基金项目(2015ZR-14-24)
西藏大学农牧学院2014年提升综合实力建设项目(生态学科)
关键词
粗木质残体
养分元素储量
急尖长苞冷杉
色季拉山
coarse woody debris
nutrient element reserves
Abies georgei var. smithii
Sejila mountains
