| 不同放牧制度下短花针茅荒漠草原土壤呼吸动态研究 |
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| 引用本文： | 徐海红,侯向阳,那日苏.不同放牧制度下短花针茅荒漠草原土壤呼吸动态研究[J].草业学报,2011,20(2):219-226. |
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| 作者姓名： | 徐海红 侯向阳 那日苏 |
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| 作者单位： | 1.中国农业科学院农业资源与农业区划研究所,北京 100081;2.中国农业科学院草原研究所,内蒙古 呼和浩特 010010;3.中国农业科学院研究生院,北京 100081 |
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| 基金项目： | 国家自然科学基金重点项目(70933004); 中央级公益性科研院所基本科研业务费专项资金(中国农业科学院草原研究所:2008-J-1)资助 |
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| 摘 要： | 采用动态密闭气室法(IRGA),对短花针茅荒漠草原土壤呼吸进行野外定位观测,分析了生长季不同放牧制度土壤呼吸速率的日变化、季节变化及其与环境因子的关系。结果表明,1)不同放牧制度下短花针茅荒漠草原土壤呼吸日、季节动态差异不大,日动态受温度影响呈单峰曲线,季节变化主要受到水分因子的影响;2)与自由放牧土壤呼吸日均速率(0.449 7 μmol CO2/m2·s)相比,划区轮牧(0.504 7 μmol CO2/m2·s)在干旱月份较大,围栏禁牧(0.529 5 μmol CO2/m2·s)除生长季初都显著增大,但纵观整个生长季,不同放牧制度下土壤呼吸均值差异不显著;3)土壤呼吸日均速率与气温的相关性大于与土壤温度的相关性,水温复合模型较单因子模型更好地解释土壤呼吸速率的变化;4)划区轮牧和自由放牧较围栏禁牧增大了土壤呼吸的温度敏感性(水分充足时),降低了土壤水分对土壤呼吸的影响。研究表明,不同的放牧方式对土壤呼吸速率及其环境因子效应影响较小,围栏禁牧较自由放牧改变了土壤呼吸日均速率及水热因子效应。
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| 关 键 词： | 荒漠草原 放牧制度 土壤呼吸 土壤水分 温度敏感系数Q10 |
| 收稿时间： | 1900-01-01; |
Dynamics of soil respiration under different grazing systems in a Stipa breviflora desert steppe |
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| XU Hai-hong,HOU Xiang-yang,NA Ri-su.Dynamics of soil respiration under different grazing systems in a Stipa breviflora desert steppe[J].Acta Prataculturae Sinica,2011,20(2):219-226. |
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| Authors: | XU Hai-hong HOU Xiang-yang NA Ri-su |
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| Institution: | 1.Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China;2.Grassland Research Institute, Chinese Academy of Agriculture Sciences, Hohhot 010010, China;3.Graduate School of Chinese Academy of Agricultural Sciences, Beijing 100081, China |
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| Abstract: | Using a dynamic enclosed chamber(IRGA),the effects of grazing systems on diurnal and seasonal variation of soil respiration in Stipa breviflora desert steppe were studied.1) There was no significant difference between grazing systems in diurnal or in seasonal variation.The diurnal variation of soil respiration could be expressed as a single peak curve,and the seasonal variation was mainly affected by soil moisture.2) The daily mean soil respiration rate was significant lower in continuously grazed plots(0.4... |
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| Keywords: | desert steppe grazing systems soil respiration soil moisture temperature sensitivity coefficient |
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