采样尺度对北京山区典型流域森林土壤养分空间变异的影响——以密云潮关西沟流域为例  

Effect of Sampling Scale on Spatial Variability of Forest Soil Nutrient in Typical Watershed with Miyun Chaoguan West Watershed for example

作　　者：余新晓[1] 耿玉清[1] 牛丽丽[2] 岳永杰[3] 

机构地区：[1]北京林业大学水土保持学院水土保持与荒漠化防治教育部重点实验室,北京100083 [2]辽宁省人民政府发展研究中心,沈阳110032 [3]内蒙古农业大学林学院,呼和浩特010019

出　　处：《林业科学》2010年第10期162-166,共5页Scientia Silvae Sinicae

基　　金：北京市教委项目"基于首都圈森林生态系统定位站平台的林木耗水研究";林业公益性行业科技专项经费项目"典型区域森林生态系统健康维护与经营技术研究"(200804022)

摘　　要：不同覆被条件下土壤质量演变规律的研究是持续利用森林土壤资源的基础（Naeletal.,2004）。由于山地地表起伏不定且植被在空间分布上表现出不同的格局,导致了森林土壤巨大的空间变异性,并给森林土壤研究造成了巨大的障碍。国外不少学者利用经典统计学和地统计学手段，研究了不同林木种类、树冠空间位置、植被镶嵌斑块以及不同土壤类型等对土壤有机碳和土壤养分因子变异的影响，Three 50 m × 50 m plots were set respectively in a pure Pinus tabulaeformis forest, a conifer-broad mixed forest dominated by Quercus liaotungensis and a broad mixed forest dominated by Quercus mongolicus in Miyun Chaoguan watershed. Soil samples were collected in three different sampling scales of 5 m ×5 m, 10 m × 10 m and 25 m ×25 m by using the mechanical grid-sampling method under the different vegetation types. The soil pH value and concentrations of organic matter, nitrogen, phosphorus and potassium in the soil were investigated. The results showed that the soil pH value, concentrations of soil organic matter, total nitrogen, available nitrogen and phospho/us, under the pure pine forest were significantly lower than both of the conifer-broad mixed forest and the broad mixed forest at 5 m × 5 m sampling scale. At 10 m × 10 m sampling scale, the difference of soil nutrient indicators except soil organic matter between the pine forest and the two mixed forests were as same as they were at 5 m ×5 m sampling scale. However, only available nitrogen and phosphorus under the pure pine forest were significantly lower than the two mixed forests at 25 m × 25 m sampling scale. The coefficient of variation of each soil nutrient concentrations was not correlated to different soil sampling scale. The average coefficient of variation of the soil nutrient indicators under the three vegetation types at three sampling scales followed the order： soil available phosphorus 〉 soil organic matter 〉 soil total nitrogen 〉 soil available potassium 〉 soil available nitrogen 〉 soil total phosphorus 〉 soil total potassium 〉 soil pH value. In order to analyze soil nutrients with a confidence level of 95% and an estimated accuracy of 80% , the soil sampling number of soil pH, soil organic matter, soil total nitrogen, soil available nitrogen, soll total phosphorus, soil available phosphorus, soil total potassium and soil available potassium under the three vegetation types at 25 m × 25 m sampling scale were 3,13,15

关 键 词：植被类型 森林土壤养分 采样尺度 空间变异 采样数 

分 类 号：S714.3[农业科学—林学]