开垦对内蒙古温带草地土壤不同有机碳组分的影响(英文)

编号 zgly0001585704

文献类型 期刊论文

文献题名 开垦对内蒙古温带草地土壤不同有机碳组分的影响(英文)

作者 齐玉春  董云社  彭琴  肖胜生  何亚婷  刘欣超  孙良杰  贾军强  杨智杰 

作者单位 InstituteofGeographicSciencesandNaturalResourcesResearch  CAS  JiangxiProvincialResearchInstituteforSoilandWaterConservation  GraduateUniversityofChineseAcademyofSciences  KeyLaboratoryofHumidSubtropicalEco-geographicalProcess 

母体文献 Journal of Geographical Sciences 

年卷期 2012年02期

年份 2012 

分类号 S812.2 

关键词 temperategrassland  cultivation  soil  totalorganiccarbon  dissolvedorganiccarbon  microbialbiomasscarbon 

文摘内容 Cultivation is one of the most important human activities affecting the grassland ecosystem besides grazing, but its impacts on soil total organic carbon (C), especially on the liable organic C fractions have not been fully understood yet. In this paper, the role of cropping in soil organic C pool of different fractions was investigated in a meadow steppe region in Inner Mongolia of China, and the relationships between different C fractions were also discussed. The results indicated that the concentrations of different C fractions at steppe and cultivated land all decreased progressively with soil depth. After the conversion from steppe to spring wheat field for 36 years, total organic carbon (TOC) concentration at the 0 to 100 cm soil depth has decreased by 12.3% to 28.2%, and TOC of the surface soil horizon, especially those of 0-30 cm decreased more significantly (p<0.01). The dissolved organic carbon (DOC) and microbial biomass carbon (MBC) at the depth of 0-40 cm were found to have decreased by 66.7% to 77.1% and 36.5% to 42.4%, respectively. In the S.baicalensis steppe, the ratios of soil DOC to TOC varied between 0.52% and 0.60%, and those in the spring wheat field were only in the range of 0.18%-0.20%. The microbial quotients (qMBs) in the spring wheat field, varying from 1.11% to 1.40%, were also lower than those in the S. baicalensis steppe, which were in the range of 1.50%-1.63%. The change of DOC was much more sensitive to cultivation disturbance. Soil TOC, DOC, and MBC were significantly positive correlated with each other in the S. baicalensis steppe, but in the spring wheat field, the correlativity between DOC and TOC and that between DOC and MBC did not reach the significance level of 0.05.