| 秸秆还田对宁南旱区土壤有机碳含量及土壤碳矿化的影响 |
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| 引用本文： | 张鹏,李涵,贾志宽,王维,路文涛,张惠,杨宝平.秸秆还田对宁南旱区土壤有机碳含量及土壤碳矿化的影响[J].农业环境保护,2011(12):2518-2525. |
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| 作者姓名： | 张鹏 李涵 贾志宽 王维 路文涛 张惠 杨宝平 |
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| 作者单位： | [1]西北农林科技大学中国旱区节水农业研究院,陕西杨凌712100 [2]农业部旱地作物生产与生态重点开放实验室,陕西杨凌712100 |
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| 基金项目： | “十一五”国家科技支撑课题“农田集雨保水关键技术研究”（2006BAD29B03）;“节水共性技术研究”（2007BAD88B10） |
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| 摘 要： | 为了探明秸秆还田对宁南旱区土壤有机碳及土壤碳矿化的影响,为该区作物生产及土壤培肥制度的建立提供参考,通过4a（2007—2010年）秸秆还田定位试验,设置不同秸秆还田量处理,谷子秸秆按3000kg·hm-（2低L）、6000kg·hm-（2中M）、9000kg·hm-（2高H）粉碎还田,玉米秸秆按4500kg·hm-（2低L）、9000kg·hm-（2中M）、13500kg·hm-（2高H）粉碎还田,对照为秸秆不还田,对不同处理条件下土壤有机碳、土壤碳矿化速率、累积矿化量及其与不同形态碳素之间的相关性进行了分析。结果表明,土壤总有机碳、活性有机碳含量均随土层的加深而减少;各处理0～60cm土层土壤有机碳和活性有机碳含量分别比CK显著提高了24.2%、20.8%、9.5%和50.3%、46.6%、34.8%（P〈0.05）;秸秆还田不仅增加了土壤活性有机碳含量,同时也显著提高了0～20cm土层活性有机碳占总有机碳含量的比重,提高幅度达21.1%～23.1%（P〈0.05）;土壤碳矿化速率和累积矿化量在0～60cm各土层内随着秸秆还田量的增加大小顺序均为高量秸秆还田〉中量秸秆还田〉低量秸秆还田〉秸秆不还田,各秸秆还田处理较CK差异显著（P〈0.05）。相关性分析表明,土壤碳累积矿化量与不同形态碳素之间均存在极显著相关性。因此,在宁南半干旱区采用秸秆还田对提高土壤有机碳含量和碳矿化具有明显作用。
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| 关 键 词： | 秸秆还田 宁南旱区 土壤有机碳 土壤碳矿化 |
Effects of Straw Returning on Soil Organic Carbon and Carbon Mineralization in Semi-arid Areas of Southern Ningxia,China |
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| ZHANG Peng,LI Han,JIA Zhi-kuan,WANG Wei,LU Wen-tao,ZHANG Hui,YANG Bao-ping.Effects of Straw Returning on Soil Organic Carbon and Carbon Mineralization in Semi-arid Areas of Southern Ningxia,China[J].Agro-Environmental Protection,2011(12):2518-2525. |
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| Authors: | ZHANG Peng LI Han JIA Zhi-kuan WANG Wei LU Wen-tao ZHANG Hui YANG Bao-ping |
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| Institution: | 1.The Chinese Institute of Water-saving Agriculture,Northwest A＆F University,Yangling 712100,China;2.Key Laboratory of Crop Production and Ecology,Minister of Agriculture,Northwest A＆F University,Yangling 712100,China) |
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| Abstract: | A field experiment was conducted to determine the effects of straw returning systems on soil organic carbon and carbon mineralization of millet or corn under different straw returning supplies.In order to provide a basic theoretical to establish the fertilization system and crop management for semi-arid areas of southern Ningxia,we studied the effects of straw returning,taking no straw returning as the control,on soil organic carbon,mineralization rate,mineralization amount and the correlation with different kinds of soil carbon under different straw returning treatments 3 000 kg·hm-2（L）,6 000 kg·hm-2（M） and 9 000 kg·hm-2（H） of millet straw and 4 500 kg·hm-2（L）,9 000 kg·hm-2（M） and 13 500 kg·hm-2（H） of corn straw] for four years（2007—2010）.After the millet harvest（2010）,the results of four years field experiment showed that soil total organic carbon and labile organic carbon decreased with deeper layer;compared with CK,with the reduction of straw returning in 0~60 cm soil layer,the soil organic carbon increased 24.2%,20.8%,9.5%（P0.05）,and soil labile organic carbon increased 50.3%,46.6%,34.8%（P0.05）;straw returning treatment improved the proportion of the labile organic carbon,which accounts for 21.1%～23.1%（P0.05） of the total organic carbon content in 0~20 cm soil layer.Different straw returning treatments had different effects on the contents of soil carbon mineralization rate and mineralization amount of 0~60 cm soil layer,follow the order from high to low HMLCK;the straw returning had significant difference with CK.The soil carbon mineralization amount had extremely significant correlation with other kinds of soil carbon.The content of soil organic carbon and carbon mineralization could be improved efficiently by using of straw returning technology in semi-arid areas of Southern Ningxia. |
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| Keywords: | straw returning semi-arid areas of southern Ningxia soil organic carbon carbon mineralization |
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