生物覆盖对山地杨树人工林根际土壤钾动态的影响  

Effects of Biological Mulching on Dynamics of Potassium Content in Rhizospheric Soil of Poplar Plantation in Southern Upland Area

作　　者：刘久俊[1] 方升佐[2] 

机构地区：[1]国家林业局昆明勘察设计院,云南昆明650216 [2]南京林业大学森林资源与环境学院,江苏南京210037

出　　处：《贵州林业科技》2015年第4期1-5,共5页Guizhou Forestry Science and Technology

基　　金：退耕还林地杨树人工林的生物覆盖效应及其机理研究(项目编号:30671671)

摘　　要：以山地杨树人工林为对象,研究了不同覆盖量和不同覆盖材料对根际土壤钾动态的影响,旨在为确定最佳的生物覆盖方案提供科学依据。研究表明:不同生物覆盖量对根际土壤全钾含量的影响不显著,2.5kg.m-2、5.0kg.m-2和7.5kg.m-2处理的全钾含量分别比对照提高6.94%、3.34%和10.90%;四种生物材料处理间的差异不大,但均大于对照,白栎、白茅、蕨、马桑和对照处理的土壤全钾含量分别为12.28g.kg-1、12.45g.kg-1、13.35g.kg-1、12.97 g.kg-1和10.84g.kg-1。覆盖能有效提高根际土壤速效钾含量,覆盖量越大,效果越明显;不同覆盖材料对根际土壤速效钾的影响有较明显差异,蕨类和白茅要优于白栎和马桑。不同覆盖材料对根际土壤钾的动态变化的影响与不同覆盖量相似,覆盖以后全钾含量及速效钾含量有先下降后上升的趋势。In order to achieve a suitable and scientific scheme of biological mulching in southern upland area, effects of mulching weights and materials on dynamics of potassium contents in rhizospheric soil of poplar pl.antation were investigated. The results were as follows： there were some differences among mulching weights, and the con- tents of total potassium in the treatment with 2. 5, 5.0, 7.5kg. m^-2 were 6.94%, 3, 34% and 10. 90% higher than that of the control, respectively ; there were little differences among different mulching materials, and the contents of total potassium mulching with Quercus fabri, Imperata cylindrical vat. major, Pteridium aquilinum vat. latiuscukum, Coriaria nepalensis were 12.28g. kg^-1 , 12. 45g. kg^-1 , 13.35g. kg^-1, and 12.97g. kg^-1 , respectively, all higher than that of the control （ 10.84g, kg^-1 ） ; the effects of mulching materials on dynamic of potassium contents in rhi- zospheric soil were similar to that of mulching weights, and the contents of total potassium and available potassium decreased from April to July, then increased from July to December after biological mulching.

关 键 词：生物覆盖 杨树 根际土壤 全钾 速效钾 

分 类 号：S714.6[农业科学—林学]