草业学报2011，Vol.20Issue(2)：76-84,9.
黄土丘陵区撂荒群落土壤速效养分空间变异性研究
Spatial heterogeneity of available soil nutrients in abandoned ole-field communities in the Loess Hilly Region
摘要
Abstract
Using classical statistics and geo-statistics, the spatial heterogeneity of soil available nutrients in five typical old-field communities with different abandonment ages in Loess Hilly Region were demonstrated at community scale. The results indicated that: 1) In the case of nutrient levels, old-fields in the study area are attributed by relative poor soils, 0-20 and 20-40 cm available nutrients increased in middle abandonment stage of succession, nutrient content in surface soil was higher than that in sub-layer. 2) The variability of available nutrients was mainly composed of structural variation. Soil available potassium and nitrate nitrogen in 0-20 cm of the 6-7 years old-field, and subsurface soil nitrate nitrogen in 20-40 cm of the 25-years old-field had intermediate spatial correlation. In other old-fields, available nutrients in surface and subsurface soil had strong spatial correlation. 3) 0-20 cm available potassium and nitrate nitrogen showed the strongest spatial variability in earlier abandonment stage of succession; 20-40 cm available potassium and nitrate nitrogen showed the strongest spatial variability in middle and early-middle stage of succession respectively; Spatial variability of available phosphorus and ammonium nitrogen in surface layer was strongest in middle abandonment stage of succession; Spatial variability of available phosphorus and ammonium nitrogen in subsurface layer was strongest in earlymiddle and middle abandonment stage of succession respectively. Regarding about the index of spatial heterogeneity, significant differences were found among the 5 old-field communities, which implies that the principal ecological processes of the four available soil nutrients are assorted.关键词
黄土丘陵区/撂荒群落/速效养分/空间变异性Key words
Loess Hilly Region/ abandoned ole-field communities/ available soil nutrients/ spatial heterogeneity分类
农业科技引用本文复制引用
隋媛媛,杜峰,张兴昌..黄土丘陵区撂荒群落土壤速效养分空间变异性研究[J].草业学报,2011,20(2):76-84,9.基金项目
中国科学院"西部之光"资助项目(2007ZD02)和中国博士后基金资助项目(20070411146)资助. （2007ZD02）
