陕北榆林地区沙漠化土壤理化性质、土壤酶活性及其与植物C,N的关系  

Relations of Soil Physicochemical Properties and Soil Enzyme Activities with Plant C and N in Yulin Area of North Shaanxi Province

作　　者：王春杰[1] 朱志梅[1] 张仁慧[1] 杨梅焕[1] 

机构地区：[1]西北大学环境科学系,陕西西安710127

出　　处：《水土保持通报》2010年第5期57-62,共6页Bulletin of Soil and Water Conservation

基　　金：国家自然科学基金"陕北沙漠化土壤驱动机制与植物的耐胁迫性研究"(30700648);陕西省自然科学基金"陕北能化基地生态建设基础研究-沙漠化演变机制分析"(2006Z05);陕西教育厅专项科研计划项目"陕北风沙草原区沙漠化土壤与植物耐胁迫驱动机制"(08JK442);西北大学研究生创新项目"陕北毛乌素沙漠生态修复机理研究"(08YZZ27)

摘　　要：用空间代替时间的方法采样,对陕北榆林地区不同程度沙漠化土壤理化性质、土壤酶活性及其和植物体有机C、全N的关系进行了研究。结果表明,(1)土壤理化性质随沙漠化过程变化呈现规律性的变化。随沙漠化加剧,同一沙漠化梯度不同剖面的pH值随深度增加基本呈增加趋势。随沙漠化程度加剧,土壤脲酶活性急剧降低,随土壤剖面加深,酶活性也呈现明显下降的趋势;土壤过氧化氢酶活性在整个剖面较高,并随剖面深入先降低后升高。(2)相关性分析表明,研究区土壤pH值与其它因子的相关性均不大,除pH值外的其它各因子间存在着密切的相关性;除植物和土壤C/N、土壤容重与其它各指标存在负相关关系外,其它指标间均存在正相关关系。Using the methodology of ＂the temporal for the spatial＂,this paper studies the relation of soil physicochemical properties and soil enzymatic activities with plant organic C and total N in different desert lands in Yulin Prefecture,North Shaanxi Province.Results showed that with the process of increasing desertification,soil physicochemical properties changed regularly.At the same time,soil pH value in different profiles at the same desertification degree increased with soil depth increasing and soil urease activity was reduced sharply although the variation of soil pH value was not so obvious.Soil catalase activity in the whole profile was relatively higher and it first decreased and then increased with profile depth increasing.Correlation analysis showed that in the study area,there was little relevance between soil pH value and other factors and a close correlation among all factors except soil pH value.Except plants and the soil C/N value,the correlation between soil bulk density and other indexes was negative and the correlation among other indicators was positive.

关 键 词：沙漠化 土壤理化性质 土壤酶活性 陕北榆林地区 

分 类 号：S153.6[农业科学—土壤学] Q948.11[农业科学—农业基础科学]