不同植被对红壤养分含量及吸附-解吸性能的影响  

Effects of vegetation types on soil nutrient contents and adsorb-desorption of red soil

作　　者：曾希柏[1] 刘更另[1] 

机构地区：[1]中国农业科学院农业自然资源和农业区划研究所,北京100081

出　　处：《植物营养与肥料学报》2002年第1期35-39,共5页Journal of Plant Nutrition and Fertilizers

基　　金：国家自然科学基金 ( 4 96 310 10 );"九五"科技攻关项目 ( 96 0 0 4 0 3 12 )

摘　　要：植被类型和生长状况 ,对土壤养分和土壤对H2 PO-4 的吸附 解吸及对K+ 的缓冲特性均具有较大影响。草灌乔植被下土壤中氮磷钾等养分的含量均较高 ,白茅植被下土壤有机质含量较高 (2 1.16 g/kg) ,无植被处理下土壤有机质和养分含量均较低。 3种类型植被下 ,土壤对H2 PO-4 吸附的b值以无植被 >白茅 >草灌乔 ,不同H2 PO-4 吸附范围内的解吸率以草灌乔相对较高 ,而无植被处理下则相对较低 ;对K+ 缓冲的Q/I曲线参数比较 ,Δk0 值以草灌乔 >白茅 >无植被 ,AR0 值为白茅 >无植被 >草灌乔 ,PBCk 值为无植被 >白茅 >草灌乔。The vegetation types affected the nutrient contents of red soil firstly and then the adsorb desorption of H 2PO - 4 and the buffering capacity of K + by the red soil. There were higher nutrient contents of NPK etc. in herb shrub trees vegetation, and the higher content of OM in vegetation of cogongrass (Imperata cylindrical var. major), and the lowest contents of NPK and OM in no vegetation. Compared the three treatments, there was decreased from treatments of no vegetation, vegetation of cogongrass to herb shrub trees vegetation by the b value of H 2PO - 4 adsorption by soil, and there was opposite tendency by desorption of H 2PO - 4 in same desorption scope. Compared the parameters of K + buffering Q/I curve the ΔK 0 value decreased from herb shrub trees vegetation, vegetation of cogongrass to no vegetation, and the AR 0 value was from the vegetation of cogongrass, no vegetation to herb shrub trees vegetation, and the PBC k value was no vegetation, vegetation of cogongrass to herb shrub trees vegetation in three treatments.

关 键 词：植被 土壤养分 红壤 吸附-解吸 养分含量 钾素 缓冲能力 

分 类 号：S158[农业科学—土壤学]