陕北黄土区微地形土壤质量指标变异性及敏感性  

Variability and Sensitivities of Soil Quality Indicators of Microtopographies in Loess Regions of Northern Shaanxi

作　　者：卜耀军[1,2] 朱清科[1] 包耀贤 赵维军[1] 赵彦敏[1] 张宏芝 

机构地区：[1]北京林业大学水土保持学院,北京100083 [2]榆林学院生命科学学院,陕西榆林719000 [3]北京国电清新环保技术股份有限公司,北京100142 [4]杨家庄乡政府,河北定州073000

出　　处：《水土保持学报》2014年第3期153-157,共5页Journal of Soil and Water Conservation

基　　金：林业公益性行业科研专项(201104002-2);榆林市科技计划项目(2011SKJ10)

摘　　要：利用统计学方法分析陕北黄土区微地形土壤质量指标的变异性及敏感性。结果表明:不同微地形土壤质量指标变异性及敏感性适中,无强变异性和高度敏感指标。最小持水量、最大持水量、毛管持水量、容重、总孔隙度、毛管孔隙度及pH为弱变异性指标或不敏感指标;非毛管孔隙度、碱性磷酸酶、速效氮、速效钾、含水量、过氧化氢酶、全磷、全钾、CaCO3和CEC为中等变异性指标或低度敏感指标;蔗糖酶、速效磷、全氮、有机质和脲酶为中等变异性指标或中度敏感指标,是土壤质量恢复与调控的主要目标。不同微地形对有机质、全氮、土壤含水量、非毛管孔隙度、蔗糖酶、脲酶、碱性磷酸酶、速效磷和速效氮等土壤动态质量指标的变异性起主导作用。在陕北黄土区土壤质量评价中,应充分考虑微地形类型,可选择中度敏感指标。Classical statistics methods were adopted to analyze variability and sensitivities of soil quality indicators of microtopographies in loess regions of northern Shaanxi province. The results showed that the different soil quality indicators of microtopographies were found to present moderate variability and sensitivities, neither being highly variable indicators nor being highly sensitive ones. Minimum water-holding capacity, maximum water-holding capacity, capillary water-holding capacity, bulk density, total porosity, capillary porosity and pH were soil quality indicators of weak variability or insensitivity; non-capillary porosity, alkaline phosphatase, available nitrogen and potassium, soil moisture, catalase, total potassium and phosphorous, CaCO3, and CEC were indicators of moderate variability or low sensitivity, and sucrase, available phosphorous, total nitrogen, organic matter and urease were soil quality indicators of moderate variability or moderate sensitivity which taken as main targets in restoring and improving soil quality. Different microtopographies played a dominant role in the variability of the dynamic soil quality indicators such as organic matter, total nitrogen, soil moisture, non-capillary porosity, sucrase, urease, alkaline phosphatase and available phosphorus and nitrogen. It should take into full account different microtopographies and had better adopting soil quality indicators of moderate sensitivity to assess soil quality in loess regions of northern Shaanxi province.

关 键 词：微地形 土壤质量变异性 土壤质量敏感性 陕北黄土区 

分 类 号：S158[农业科学—土壤学]