不同种植密度下三倍体毛白杨林地土壤的养分消耗  

Annual Change of Soil Nutrients in Triploid Populus tomentosa Plantations under Different Planting Densities

作　　者：赵雪梅[1] 孙向阳[1] 王海燕[1] 康向阳[2] 王玉红[2] 

机构地区：[1]水土保持与荒漠化防治教育部重点实验室(北京林业大学),北京100083 [2]北京林业大学

出　　处：《东北林业大学学报》2009年第1期42-44,共3页Journal of Northeast Forestry University

基　　金：国家"十一五"科技支撑项目(2006BAD32B01);国家林业局专项课题(2002-66);北京林业大学研究生基金资助

摘　　要：以2年生三倍体毛白杨品种S8和二倍体毛白杨品种S10为试验材料,采用裂区设计进行田间试验,探讨3种种植密度A1(3 m×4 m)、A2(2 m×4 m)、A3(2 m×5 m)条件下林地土壤养分的年变化及不同土壤层次养分的消长变化情况。对2005—2006年不同种植密度下毛白杨林地土壤的pH值、有机质、全N、碱解N、全P、速效P、全K、速效K的变化进行了分析。结果表明:1 a后土壤pH值略有增加;A1种植密度下土壤全N、碱解N、速效P降低最多,A2密度下全K和速效K消耗最多,A3密度下土壤有机质及全P下降最多。在0<土壤深度(h)≤20cm土层中,土壤有机质、全N、全P消耗量最大;在40 cm<h≤60 cm土层中,土壤碱解N、全K、速效K消耗较多;土壤中速效P在20 cm<h≤40 cm土层消耗量最多。The split-split plot design was used to study the annual change of soil nutrients in different soil layers in 2-year-old triploid Populus tomentosa （S8） and duple P. tomentosa （S10） plantations grown under three different planting densities of A1 （3m×4m） , A2（2m×4m）, A3（2m ×5m）in Wei County, Hebei Province. The content changes of soil nutrients （organic matter, total N, available N, total P, available P, total K, and available K） and soil pH value in P. tomentosa plantations under different planting densities were analysed between 2005 and 2006. Result showed that the contents of soil nutrients decreased while soil pH value increased in 2006. Total N, available N and available P largely decreased under the planting density of A1, total K and available K obviously declined under A2 and total P under A3. Organic matter, to- tal N and total P remarkably decreased in 0-20cm soil layer, available P in 20-40 cm soil layer, available N, total K and available K in 40-60cm soil layer.

关 键 词：三倍体毛白杨 土壤养分 种植密度 

分 类 号：S792.117[农业科学—林木遗传育种] S714.8[农业科学—林学]