| 不同利用方式对小针茅荒漠草原土壤活性有机碳的影响 |
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| 引用本文： | 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. |
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| 作者姓名： | 邱璇 赵建宁 李文亚 张乃芹 杨殿林 |
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| 作者单位： | 1.沈阳农业大学园艺学院,辽宁 沈阳 110866; 2.农业部环境保护科研监测所,天津 300191; 3.德州学院生态与园林建筑学院,山东 德州 253023 |
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| 基金项目： | 国家自然科学基金项目(31170435)，“十二五”国家科技计划项目(2012BAD13B07)资助。 |
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| 摘 要： | 通过围封、3个放牧梯度0.50羊单位/hm2(G0.50)、0.94羊单位/hm2(G0.94)、1.25羊单位/hm2(G1.25)]和开垦5种不同的处理条件下,对内蒙古小针茅荒漠草原土壤总有机碳、水溶性有机碳、易氧化有机碳、微生物量碳含量和土壤基本理化的影响开展野外监测试验。结果表明,1)不同利用方式下,小针茅荒漠草原土壤总有机碳、全氮、全磷、碳氮比均表现为围封>G0.50>G0.94>开垦>G1.25。其中围封区的土壤有机碳含量、全氮含量显著高于G0.94、G1.25和开垦区(P<0.05),随着放牧强度的增加,土壤有机碳、全氮、全磷、碳氮比均呈现逐渐降低的趋势。2)开垦区和放牧区土壤表层(0~20 cm)水溶性有机碳、易氧化有机碳、微生物量碳含量,均显著低于围封区(P<0.05);在放牧区,随着放牧强度的增加土壤活性有机碳含量均逐渐降低。3)围封4年后小针茅荒漠草原土壤活性有机碳占总有机碳的比例提高,放牧和开垦使活性有机碳的比例下降。其中,围封区的土壤微生物量碳比例显著高于G0.94、G1.25和开垦区(P<0.05),较G0.50、G0.94、G1.25和开垦区分别增加了0.26,0.53,0.66和0.43个百分点。4)土壤总有机碳、水溶性有机碳、易氧化有机碳、微生物量碳含量均具有显著(P<0.05)或极显著(P<0.01)的正相关关系,土壤活性有机碳组分与土壤理化性质具有密切的关系。
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| 关 键 词： | 活性有机碳 利用方式 小针茅荒漠草原 |
| 收稿时间： | 2015-11-27 |
Effects of different land-use types on soil active organic carbon in the Stipa klemenaii desert steppe of Inner Mongolia |
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| QIU Xuan,ZHAO Jian-Ning,LI Wen-Ya,ZHANG Nai-Qin,YANG Dian-Lin.Effects of different land-use types on soil active organic carbon in the Stipa klemenaii desert steppe of Inner Mongolia[J].Acta Prataculturae Sinica,2016,25(9):1-9. |
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| Authors: | QIU Xuan ZHAO Jian-Ning LI Wen-Ya ZHANG Nai-Qin YANG Dian-Lin |
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| Institution: | 1.College of Horticulture, Shenyang Agriculture University, Shenyang 110866, China; 2.Agro-environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China; 3.College of Ecology and Garden Architecture, Dezhou University, Dezhou 253023, China |
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| 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. |
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| Keywords: | soil active organic carbon land use type Stipa klemenaii desert steppe |
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