森林生态系统土壤保持价值的年内动态  

Intra-annual dynamics of soil conservation value in forest ecosystem

作　　者：李士美[1,2] 谢高地[1] 张彩霞[1,2] 祁悦[1,2] 

机构地区：[1]中国科学院地理科学与资源研究所,北京100101 [2]中国科学院研究生院,北京100049

出　　处：《生态学报》2010年第13期3482-3490,共9页Acta Ecologica Sinica

基　　金：国家重点基础研究发展计划资助项目(2009CB421106);国家自然科学基金资助项目(30770410)

摘　　要：以定位观测数据位基础,选用日雨量模型和通用土壤流失方程,研究了5种森林生态系统土壤保持价值的年内动态。研究表明,季节雨林、次生林、人工橡胶林、阔叶红松林和次生白桦林的土壤保持价值分别为570.29、347.87、174.65、14.31元.hm-.2a-1和8.76元.hm-.2a-1。土壤保持价值各月分配不均,5-10月的土壤保持价值占全年土壤保持价值的80%以上。西双版纳3种森林生态系统土壤保持价值构成中,保持土壤养分的价值高达60%以上。长白山2种森林生态系统的土壤保持价值构成有所不同,阔叶红松林以减少泥沙淤积价值为主,而次生白桦林以保持土壤养分价值为主。土壤保持价值构成中,减少废弃地价值的不足总价值的10%。Based on observational data,the intra-annual dynamics of soil conservation values in five forest ecosystems were studied by means of daily rainfall erosive agent model and the Universal Soil Loss Equation.The results show that the soil conservation values of seasonal rainforest,secondary forest,rubber plantation,broad-leaved korean pine forest and secondary birch forest are 570.29,347.87,174.65,14.31 and 8.76 yuan·hm-2·a-1,respectively.The soil conservation values are characterized with an uneven distribution in a year and the soil conservation value produced from May to October takes up 80% of the annual total value.In the composition of soil conservation value in three forest ecosystems in Xishuangbanna,the value of soil nutrition conservation accounts for more than 60%.In two forest ecosystems in Changbaishan,the composition of soil conservation value is different and the value of decreasing soil deposit is predominated in broad-leaved korean pine forest,while the value of soil nutrition conservation is predominated in secondary birch forest.The value of reducing land disuse accounts for less than 10% of the total soil conservation value.

关 键 词：土壤保持价值 土壤侵蚀 通用土壤流失方程 季节雨林 阔叶红松林 

分 类 号：S714[农业科学—林学]