黄土高原刺槐林对土壤养分时空分布的影响  

Time-space Distributive Feature of Soil Nutrient and Chemical Characteristics of Robinia Pseudoacia L.Plantation Forestland in Loess Plateau

作　　者：张社奇[1] 王国栋[1] 张蕾[2] 

机构地区：[1]西北农林科技大学理学院,陕西杨凌712100 [2]西北大学化学系,陕西西安710069

出　　处：《水土保持学报》2008年第5期91-95,共5页Journal of Soil and Water Conservation

基　　金：国家“十五”科技攻关计划重大专项(2001BA516A15-05);陕西省自然基金项目(20020201093)

摘　　要：以不同树龄刺槐纯林林地和撂荒地作对比,研究了黄土高原刺槐人工林对土壤养分时空分布特征的影响。结果表明,刺槐林地土壤有机质、pH值、全氮、有效氮、有效磷、速效钾、交换性钙和交换性盐基总量随刺槐树龄增加无明确变化规律,土壤全磷和交换性镁含量则呈现波动性变化;刺槐林地土壤有机质、全氮、有效氮含量随土壤深度增加按幂函数衰减,有效磷含量有递减趋势,土壤全磷、速效钾、交换性钙、交换性镁和交换性盐基总量随土壤深度增加无明显变化规律,而土壤pH随深度呈波动性变化;与撂荒地相比,刺槐林地土壤有机质、全氮、有效氮、有效磷、速效钾、交换性钙、交换性镁含量及交换性盐基总量分别增加21.6%-96.8%,34.3%-160.1%,191.5%-238.4%,2.1%-24.1%,19.82%-92.71%,64.2%-80.0%,25.0%-46.5%和67.2%-89.5%,表明刺槐林对改善土壤养分状况具有重要作用。Time-space effect of soil nutrient and chemical characteristics of Robinia pseudoacia L. plantation forestland in Loess Plateau has been studied. The results shows that. soil organic matter, pH,total N,available N, available P＇and available K, exchangeable Ca and exchangeable base capacity changes irregularly with tree age, total P and exchangeable Mg changes fluctuantly Soil organic matter, total N,available N decreases by power function with soil depth, available P tends to decreases, total P, available K, exchangeable Ca, exchangeable Mg and exchangeable base capacity varies irregularly with soil depth, but pH-value changes fluctuantly Compared with wasteland, soil organic matter, total N, available N, total P, available P, exchangeable Ca, exchangeable Mg and exchangeable base capacity raises respectively by 21.56% -96.8%, 34.3%-160. 1%, 191.5%-238.4%, 2. 1%-24.1%, 19.82%-92.71%, 64.21%-80. 02%, 25%- 46.5%, 67.2%-89.5%. These showed that Robinia pseudoacia L. plantation can improve the condition of soil nutrient effectively.

关 键 词：刺槐人工林 树龄 土壤深度 土壤养分状况 阳离子交换 

分 类 号：S151.9[农业科学—土壤学]