| 祁连山不同海拔梯度和放牧强度土壤呼吸变化特征 |
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| 引用本文： | 刘贤德,车宗玺,金铭,敬文茂,罗龙发,马钰.祁连山不同海拔梯度和放牧强度土壤呼吸变化特征[J].干旱区研究,2009,26(1). |
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| 作者姓名： | 刘贤德 车宗玺 金铭 敬文茂 罗龙发 马钰 |
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| 作者单位： | 甘肃省祁连山水源涵养林研究院,甘肃,张掖,734000 |
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| 基金项目： | 国家林业局科技支撑项目 |
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| 摘 要： | 分析青海云杉林、灌丛林、放牧草地三者的呼吸速率差异性以及放牧强度对土壤呼吸速率的影响,结果表明:①云杉林、灌丛林和放牧草地在16:00之前的呼吸速率大小顺序为:灌从林>云杉林>草地;16:00之后顺序为:云杉林>灌丛林>草地.②土壤呼吸速率和日均温有Y=10.342e-0.0002x,R2=0.0002的线性关系.这一线性关系可以解释很多土壤呼吸的变化情况.③放牧直接影响土壤含水量,放牧强度与土壤含水量呈负相关,土壤含水量与土壤呼吸速率呈正相关.土壤含水量为:重度放牧区>过度放牧区>极度放牧区;土壤呼吸速率为:重度放牧区>过度放牧区>极度放牧区.④温度是影响土壤呼吸的主要因子,与土壤呼吸速率呈正相关,呼吸速率日均最大值出现在6～7月,为8.66umoL/(m2·s);最小值出现在5月,为0.37umol/(m2·s).
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| 关 键 词： | 祁连山 草原 土壤呼吸 放牧强度 海拔梯度 土壤含水量 |
Respiration in Soil Response to Elevations and Grazing Intensities in the Qilian Mountains |
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| LIU Xian-de,CHE Zong-xi,JIN Ming,JING Wen-mao,LUO Long-fa,MA Yu.Respiration in Soil Response to Elevations and Grazing Intensities in the Qilian Mountains[J].Arid Zone Research,2009,26(1). |
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| Authors: | LIU Xian-de CHE Zong-xi JIN Ming JING Wen-mao LUO Long-fa MA Yu |
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| Institution: | Qilian Mountain Institute of Water-conservation Forest Research;Zhangye 734000;Gansu Province;China |
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| Abstract: | In this study,the difference in the respiration rate of soils(soil CO2 release rate) in the Picea crassifolia forest,a scrub forest and grazing steppes with different elevations(2 500 m,2 700 m,2 850 m and 3 000 m a.s.l.),as well as the effects of grazing intensity on soil respiration rate in the Qilian Mountains was evaluated.The analysis was based on the soil respiration rate,surface temperature,ground temperature at depths of 5,10,15 and 20 cm,air temperature,and soil moisture content at depths of 0~5 cm... |
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| Keywords: | Qilian Mountain steppe soil respiration soil moisture content |
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