宁南山区不同坡位土壤微生物生物量和酶活性的分布特征  

Soil Microbial Biomass and Enzymatic Activities in the Loess Hilly Area of Ningxia under Different Slope Positions

作　　者：成毅[1] 安韶山[1,2,3] 马云飞[1] 

机构地区：[1]西北农林科技大学资源环境学院,陕西杨陵712100 [2]西北农林科技大学黄土高原土壤侵蚀与旱地农业国家重点实验室陕西杨陵712100 [3]中国科学院水利部水土保持研究所,陕西杨陵712100

出　　处：《水土保持研究》2010年第5期148-153,共6页Research of Soil and Water Conservation

基　　金：国家自然科学基金项目(40971171,40701095);“十一五”国家科技支撑计划重大项目(2006BCA01A07);西北农林科技大学“青年学术骨干支持计划”

摘　　要：对宁夏固原黄土丘陵区天然草地不同坡位上土壤微生物量和酶活性进行研究,旨在了解坡位对土壤微生物量及酶活的影响,通过分析土壤微生物量及酶活性间的相关关系,进一步了解其内在联系。结果表明,在3个坡面地形部位(上坡位,中坡位和下坡位)上,土壤微生物量碳随着坡位的降低而减小;土壤微生物量氮在坡顶和坡底较高,坡中较低;微生物量磷在坡中部和坡底较高,坡顶较低。土壤酶活性基本不随坡位的变化而变化。显著性分析发现,微生物量碳和酶活性没有差异显著性,微生物量氮坡顶和坡底差异显著(P<0.05,n=3),微生物量磷坡顶较坡底和坡中差异显著(P<0.05,n=3)。Soil microbial biomass and enzymatic activities were studied in soils of Guyuan Loess hills of Ningxia Province under natural grassland to understand the slope position by analyzing the soil microbial biomass and enzymatic activities between relationship,further understands its inner link.The results indicated that in the three positions of the topography（up slope position,the middle slope position and down slope position）,soil microbial biomass carbon（Cmic） reduced with the slope position down;soil microbial nitrogen（Nmic） were higher in the up slope position and down slope position and lower in the middle slope position;soil microbial phosphorus（Pmic） were higher in the middle slope position and down slope position and lower in the up slope position.Soil enzymatic activities do not change with the position.Significant analysis shows that Cmic and enzymatic activities was not significantly different,Nmic is significantly different under the up slope position and down slope position（P0.05,n=3）,and Pmic is significantly different under the middle slope position and down slope position（P0.05,n=3）.

关 键 词：坡位 土壤养分 土壤微生物量 土壤酶活性 

分 类 号：S151.9[农业科学—土壤学]