草业学报2016，Vol.25Issue(9)：1-9,9.DOI:10.11686/cyxb2015537
不同利用方式对小针茅荒漠草原土壤活性有机碳的影响
Effects of different land-use types on soil active organic carbon in the Stipa klemenaii desert steppe of Inner Mongolia
摘要
Abstract
In order to explore variation in the contents and components of soil active organic carbon under differ-ent land-use types in the Stipa klemenaii steppe of Inner Mongolia,five field treatments were studied.These treatments included three grazing intensities,0.50 sheep/hm2 (G0.50 ),0.94 sheep/hm2 (G0.94 )and 1.25 sheep/hm2 (G1 .25 ),as well as one fenced enclosure and one tract of reclamation land.Analysis was undertaken to de-termine the contents of soil organic carbon (SOC),soil dissolved organic carbon (DOC),soil readily oxidizable organic carbon (ROC),soil microbial carbon (MBC)and soil physical and chemical properties:total nitrogen (TN),total phosphorus (TP),and carbon nitrogen ratio (C/N).The results showed that the contents of SOC,TN,TP and C/N were in the following order:enclosure>G0.50 >G0.94 >reclamation>G1 .25 .The con-tents of soil organic carbon and TN of the fenced enclosure were significantly higher than that of G0.94 ,G1 .25 and the reclamation land (P <0.05).The contents of SOC,TN,TP and C/N showed a gradually decreasing trend with the increase of stocking rates.Grazing and reclamation significantly decreased the contents of DOC,ROC and MBC when compared to enclosure (P <0.05 ).The contents of SOC and soil active organic carbon de-creased gradually with the increase of stocking rates.In general,the allocation proportion of active organic car-bon increased in 0-20 cm soil layers after 4 years of fenced enclosure in the S .klemenaii steppe,whereas it decreased after grazing and reclamation.The MBC/SOC of the fenced enclosure was significantly higher than that of grazing and reclamation (P <0.05).The contents of SOC,DOC,ROC and MBC had a significant posi-tive relationship with each other (P <0.05).Soil active organic carbon and soil physical and chemical proper-ties had a close relationship.These results indicate that fenced enclosure enhances soil quality and improves the S .klemenaii steppe environment.关键词
活性有机碳/利用方式/小针茅荒漠草原Key words
soil active organic carbon/land use type/Stipa klemenaii desert steppe引用本文复制引用
邱璇,赵建宁,李文亚,张乃芹,杨殿林..不同利用方式对小针茅荒漠草原土壤活性有机碳的影响[J].草业学报,2016,25(9):1-9,9.基金项目
国家自然科学基金项目（31170435）和“十二五”国家科技计划项目（2012BAD13B07）资助。 （）
