近天然落叶松云冷杉林土壤养分特征  

Soil Nutrient Characteristics of Semi-natural Mixed Larch-spruce-fir Stands in Northeast China

作　　者：王海燕[1] 雷相东[2] 张会儒[2] 赵雪梅[3] 杨平[3] 

机构地区：[1]教育部水土保持与荒漠化防治重点实验室(北京林业大学),北京100083 [2]中国林业科学研究院资源信息研究所 [3]北京林业大学

出　　处：《东北林业大学学报》2009年第11期68-70,73,共4页Journal of Northeast Forestry University

基　　金：国家“十一五”科技支撑计划项目(2006BAD03A0802)资助

摘　　要：研究了吉林省汪清林业局近天然落叶松云冷杉林不同土层(0<土壤深度h≤20 cm、20 cm<h≤40cm和40 cm<h≤60 cm)的土壤养分状况及间伐强度对其的影响。结果表明:研究区0<h≤20 cm土层的土壤养分含量丰富。随着土壤深度的增加,土壤养分质量分数降低,在不同土层间差异均达极显著水平(P<0.01);在垂直剖面上,土壤养分变异系数均有不同程度的差异,其中0<h≤20 cm土层土壤有效P质量分数的变异系数最大,达到79.0%;土壤有机质、全N、碱解N的表聚系数较大,而全P、全K和速效K的表聚系数较小;不同间伐强度下,土壤养分的表聚系数也存在差异,且以中度间伐的表聚系数最大,说明40%以下的间伐强度,20 a后没有引起土壤养分质量分数的显著变化,可见,间伐对土壤养分的长期效应不显著。Semi-natural mixed larch-spruce-fir stands in Northeast China were selected for field experiment to study soil nutrients in the layers of 0 - 20, 20 - 40 and 40 - 60 cm and thinning effects. Results showed that soil nutrients were rich in the layer of 0 -20 cm. Soil nutrient concentrations decreased with increasing soil depth, and very significant differences （p 〈 0.01 ） were found between different soil layers. Coefficients of variation （CV） of soil nutrients varied in the soil profile, with the highest CV for soil available P in the layer of 0 ~ 20 era, which reached 79.0%. The ratios of soil nutrient concentration in topsoil to that in subsoil enhancement （RTE） were different. The higher RTE values were found for soil organic matter, total and available N, whereas lower RTE values for total P, total and readily available K. The RTE values varied with thinning intensities, with the highest RTE value for medium thinning. Thinning intensity had no significant effects on soil nutrient concentration （p 〉 0.05 ） , indicating a virtuous circle of soil nutrients in the close-to-nature forest stands at an interval of 20 years after thinning below an intensity of 40%.

关 键 词：落叶松云冷杉混交林 土壤养分 异质性 表聚系数 间伐 

分 类 号：S714.5[农业科学—林学]