生态学杂志2013，Vol.32Issue(7)：1710-1716,7.
不同植被被覆下温性草原土壤养分分异特征
Differentiation characteristics of soil nutrients in temperate steppe under different vegetation types
摘要
Abstract
Taking the temperate steppe under four vegetation types around the Qinghai Lake of Northwest China as test objects,this paper studied the distribution patterns of soil nutrient heterogeneity under natural condition and grazing disturbance.There existed obvious layering characteristics in the soil available N,P,and K,being the highest in surface layer (0-10 cm) and decreased with soil depth.In degraded Stipa purpurea steppe,the available nutrient contents in different soil layers were lower than those in Poe steppe,Elymus nutans steppe,and Leymus secalinus steppe.The Poe steppe which was restored for a longer time and experienced exotic substance input had higher contents of soil available nutrients.The soil total N content in degraded S.purpurea steppe and E.nutans steppe was higher in 0-20 cm layer,but decreased sharply below 20 cm depth.In contrast,both Poe steppe and L.secalinus steppe showed a higher soil total N content at each depth.The soil total P content had no significant correlation with soil depth (P＞0.05),but was significantly lower at the depths 0-10 cm,10-20 cm,20-30 cm,and 30 -40 cm in degraded S.purpurea steppe than in other three steppes (P＜0.05).The soil total K and organic matter contents in degraded S.purpurea steppe were also lower than those in other three steppes.Soil organic matter content had significant correlations with soil total and available N,P,and K (P＜0.01).Soil bulk density increased with soil depth.Degradation resulted in the increase of soil pH value.After 6 years recovery of degraded temperate steppes,the soil could be basically recovered.It was suggested that both grazing disturbance and natural factors could affect the soil nutrient status in temperate steppe.关键词
青海湖/温性草原/土壤养分/植被类型/封育Key words
Qinghai Lake/temperate steppe/soil nutrient/vegetation type/fencing分类
生物科学引用本文复制引用
李以康,张法伟,林丽,杜岩功,曹广民,郭小伟,周国英,韩发..不同植被被覆下温性草原土壤养分分异特征[J].生态学杂志,2013,32(7):1710-1716,7.基金项目
国家自然科学基金面上项目(31270576)、国家"十一五"科技支撑计划项目(2007BAC30B40)和国家自然科学基金重点项目(41030105)资助. （31270576）
