干旱区生态环境知识资源中心(Arid): 土壤水热条件对祁连山荒漠草原土壤CO

Arid

	土壤水热条件对祁连山荒漠草原土壤CO_2通量的影响
其他题名	Influence of soil moisture-temperature conditions on surface CO_2 efflux in desert steppe of the Qilian Mountains, the Northwest of China
	常宗强; 冯起; 司建华; 苏永红; 席海洋
ISSN	1000-6060
出版年	2007
卷号	30 期号:6 页码:812-819
中文摘要	采用美国Li-COR公司生产的LI-400-09土壤呼吸室和LI-6400便携式光合作用测量系统，在2004年生长季节对祁连山荒漠草原土壤CO_2通量与温度和土壤水分的关系进行了连续观测研究。结果显示，基于室内试验数据，土壤CO_2通量与土壤温度及土壤含水量的关系都可以用曲线方程很好地模拟。通过野外对祁连山荒漠草原土壤CO_2通量、土壤温度、土壤含水量和降水等因子的观测发现，生长季节土壤CO_2通量的日平均值介于1．94～9．32mumol·m~(-2)·s~(-1)。土壤CO_2通量7～8月份达到最大值，5月与9月份次之，整个生长过程总的变化趋势呈单峰曲线形式。在5～11月份7个月的时间里，祁连山荒漠草原CO_2释放量大约为1．01*10~8mumol·m~(-2)。此外，加水试验也表明在干旱季节土壤水分对土壤CO_2通量整体变化的重要性。
英文摘要	Desert steppe is the main vegetation type in the Qilian Mountains, and it covers about 28.3% of the total land area. The CO_2 efflux from the soil surface of desert steppe is a key component to the carbon balance of the ecosystem. Quantifying this flux and the factors that underlie the soil temperature and moisture variation in magni-tude are fundamental to the understanding of the fuction of the ecosystem as a whole and to the prediction of the likely consequences of climate change. Soil surface CO_2 effluxes were measured during the period from early May to late November 2004 with a LiCor 6400 gas exchange analyzer with soil respiration chamber attachment （LiCor Inc. , Lincoln, NE, USA）. The LiCor 6 400 is a closed system infrared gas analyzer that measures soil respiration. This paper focuses on factors influencing temporal trends in soil respiration with measuring CO_2 effluxes in desert steppe of Qilian Mountains, Northwest of China. Based on laboratory experiments, soil CO_2 production has been expressed as a function of soil temperature and moisture by fit equations. Field measurements included soil CO_2 effluxes, soil temperatures and moistures. Effluxes in desert steppe during the dry season were negligible, while effluxes during the rainy season were about 1.94 -9.32 mumol · m~(-2) ·s~(-1) , the maximum of average soil CO_2 efflux occurred in July and August, and the second was in May and Se tion was simulated to be 1.01 * 10~8 mumol · m~(-2) Furthermore, the importance of rain is revealed for the overall turnover of soil ptember. From May to November soil CO_2 produc-by virtue of a water controlled adding experiment respiration during the dry season.
中文关键词	土壤CO_2通量 ; 土壤水分 ; 荒漠草原 ; 祁连山
英文关键词	soil CO_2 efflux soil moisture desert steppe the Qilian Mountains
语种	中文
国家	中国
收录类别	CSCD
WOS类目	AGRICULTURE MULTIDISCIPLINARY
WOS研究方向	Agriculture
CSCD记录号	CSCD:3039258
来源机构	中国科学院西北生态环境资源研究院
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/220949
作者单位	中国科学院寒区旱区环境与工程研究所寒旱区流域水文及应用生态实验室, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	常宗强,冯起,司建华,等. 土壤水热条件对祁连山荒漠草原土壤CO_2通量的影响[J]. 中国科学院西北生态环境资源研究院,2007,30(6):812-819.
APA	常宗强,冯起,司建华,苏永红,&席海洋.(2007).土壤水热条件对祁连山荒漠草原土壤CO_2通量的影响.,30(6),812-819.
MLA	常宗强,et al."土壤水热条件对祁连山荒漠草原土壤CO_2通量的影响".30.6(2007):812-819.