黄土高原半干旱地区土地利用变化对土壤养分、酶活性的影响研究  

Effects of Landuse Change on Soil Nutrients and Enzyme Activities and Their Correlations in Semiarid Area of the Loess Plateau

作　　者：王鑫[1] 刘建新[1] 张希彪[1] 雷蕊霞[1] 来永福[1] 

机构地区：[1]陇东学院 生命科学系,甘肃庆阳745000

出　　处：《水土保持通报》2007年第6期50-55,共6页Bulletin of Soil and Water Conservation

基　　金：陇东学院自然科学研究项目(XYZK0508)资助

摘　　要：对黄土高原半干旱地区土地利用变化进行了土壤养分、酶活性及相关性研究。结果表明,过氧化氢酶活性可表征人工草地苜蓿地的速效磷、速效钾,撂荒地的有机质、全氮和碱解氮的正向转化状况,及沙棘林土壤速效磷负向转化进程,但不能用过氧化氢酶活性表征精细耕作的土壤肥力状况。多酚氧化酶活性可表征农田土壤有机质、全氮正向转化进程及菜园土和果园土有机质、全氮负向转化进程,不能表征自然土壤腐殖质转化状况。转化酶活性可表征农田、菜园土、果园、苜蓿地和撂荒地的碱解氮正向转化进程以及沙棘林碱解氮的负向转化进程,可全面表征撂荒地的速效磷负向转化进程及其它养分的正向转化进程。脲酶活性可表征果园地、菜园土的全氮、碱解氮和有机质的肥力水平。磷酸酶活性可表征果园土、农田和撂荒地的速效磷正向转化状况,不能表征其它土地利用类型的磷素转化状况。Soil nutrients, enzyme activities, and their correlations during landuse change in the semiarid area of the Loess Plateau are studied. Results show that catalase activity may indicate the right transformation condition of available P and available K in alfalfa land and organic matter, total N, and alkaline N in wasteland, as well as the negative transformation condition of available P in Sea-buckthorn land, but it may not indicate the fertilizer condition in field soil. Polyphenol oxidase activity may indicate the right transformation degree of organic matter and total N in field soil and the negative transformation degree of organic matter and total N in vegetable garden and orchard, but it may not indicate the humus transformation degree in soil. Invertase activity may indicate the right transformation degree of alkaline N in field soil, vegetable garden and orchard, alfalfa land, and wasteland and the negative transformation degree of alkaline N in sea-buckthorn land. At the same time, it may fully indicate the negative transformation degree of available P in wasteland and the right transformation degree of other nutrients. Urease activity may indicate the fertilizer level of total N, alkaline N, and organic matter in vegetable garden and orchard. Phosphatase activity may indicate the right transformation condition of available P in vegetable garden and orchard, field soil, and wasteland, but it may not indicate the phosphorus transformation condition of other landuses.

关 键 词：土地利用变化 土壤酶 酶活性 

分 类 号：S158[农业科学—土壤学] S154.2[农业科学—农业基础科学]