草业学报2019，Vol.28Issue(2)：190-196,7.DOI:10.11686/cyxb2018164
封育对荒漠草原土壤有机碳及其活性组分的影响
Effects of enclosure on the soil organic carbon and its active components in desert steppe grassland
摘要
Abstract
This experiment used spatially distributed sites which had been fenced for 0, 3, 5, 7and 10 years in desert steppe grassland in Yanchi County of Ningxia, to form a time series, for field and laboratory study of soil C dynamics.Variables measured included:total soil organic carbon (SOC), soil particulate organic carbon, soil dissolved organic carbon and soil readily oxidizable organic carbon for 10 cm increments of soil depth to 40 cm at each site.The results revealed significant differences (P＜0.05) in total organic carbon at 5-10 cm, 10-20 cm and 20-40 cm soil depth, linked to the number of years of grazing exclusion.The SOC content ranged from 2.24g·kg-1 to 4.52g·kg-1, and in general increased with increased enclosure time.Thus, values were higher in desert steppe grasslands of 7and 10 years grazing exclusion.There were no significant effects of grazing exclusion on soil particulate organic carbon (P＞0.05).The contents of soil dissolved organic carbon were highest in grazed grassland (0.59, 0.49 and 0.56g·kg-1, respectively, for 0-5cm, 5-10 cm and 20-40 cm soil depths).Values decreased initially after grazing exclusion, (with lowest values recorded after 5-7years), and then increased with longer duration of exclusion.The soil readily oxidizable organic carbon content was highest (2.48g·kg-1) in desert steppe grassland subject to 7years grazing exclusion.In summary, 7years is a recovery point in the process of natural restoration and succession of degraded desert steppe by grazing exclusion.关键词
荒漠草原/封育/土壤有机碳/土壤活性有机碳Key words
desert steppe/enclosure/soil organic carbon/soil active organic carbon引用本文复制引用
于双,陶利波,许冬梅,许爱云,刘金龙..封育对荒漠草原土壤有机碳及其活性组分的影响[J].草业学报,2019,28(2):190-196,7.基金项目
国家自然科学基金(31460624) （31460624）
宁夏高等学校一流学科建设(草学学科)项目(NXYLXK2017A01)资助 （草学学科）
