干旱区生态环境知识资源中心(Arid): 不同放牧制度下短花针茅荒漠草原土壤呼吸动态研究

Arid

	不同放牧制度下短花针茅荒漠草原土壤呼吸动态研究
其他题名	Dynamics of soil respiration under different grazing systems in a Stipa breviflora desert steppe
	徐海红 1; 侯向阳 2; 那日苏 2
来源期刊	草业学报
ISSN	1004-5759
出版年	2011
卷号	20 期号:2 页码:219-226
中文摘要	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 mumol CO_2/m~2·s)相比, 划区轮牧(0.1504 7mumol CO_2/m~2·s)在干旱月份较大, 围栏禁牧(0.529 5 mumol CO_2/m~2·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
英文摘要	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. 449 7 mumol CO_2/m~2 · s) than that in rotationally grazed (0. 504 7 mumol CO_2/m~2 · s, in dry months), or in non-grazed plots (0. 529 5 mumol CO_2/m~2 · s, throughout the growing season, except the first month), but there was no significant difference among different grazing systems in seasonal mean soil respiration rate. 3) Correlation of soil respiration diurnal variation with air temperature was greater than that with soil temperature, and a water-temperature composite model was better than a single-factor model to explain the changes in soil respiration rate. 4) Compared with non-grazing, rotational grazing and continuous grazing elevated the temperature sensitivity of soil respiration (adequate moisture), while reducing the impact of soil moisture on soil respiration. It was concluded that the soil respiration rate and effect of environmental factors were similar between rotational grazing and continuous grazing, and there were differences between continuous grazing and non-grazing in daily mean soil respiration rate and effect of environmental factors in S. breviflora desert steppe
中文关键词	荒漠草原 ; 放牧制度 ; 土壤呼吸 ; 土壤水分 ; 温度敏感系数Q_(10)
英文关键词	desert steppe grazing systems soil respiration soil moisture temperature sensitivity coefficient
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:4188110
来源机构	中国农业科学院草原研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/226214
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, 中国; 2.中国农业科学院草原研究所, 呼和浩特, 内蒙古 010010, 中国
推荐引用方式 GB/T 7714	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]. 中国农业科学院草原研究所,2011,20(2):219-226.
APA	徐海红,侯向阳,&那日苏.(2011).不同放牧制度下短花针茅荒漠草原土壤呼吸动态研究.草业学报,20(2),219-226.
MLA	徐海红,et al."不同放牧制度下短花针茅荒漠草原土壤呼吸动态研究".草业学报 20.2(2011):219-226.