气候变化领域集成服务门户(CCPortal): Non-growing season soil CO2 efflux and its changes in an alpine meadow ecosystem of the Qilian Mountains, Northwest China

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DOI	10.1007/s40333-013-0179-6
	Non-growing season soil CO2 efflux and its changes in an alpine meadow ecosystem of the Qilian Mountains, Northwest China
	Chang, ZongQiang; Liu, XiaoQing; Feng, Qi; Che, ZongXi; Xi, HaiYang; Su, YongHong; Si, JianHua
发表日期	2013
ISSN	1674-6767
EISSN	2194-7783
卷号	5 期号:4
英文摘要	Most soil respiration measurements are conducted during the growing season. In tundra and boreal forest ecosystems, cumulative, non-growing season soil CO2 fluxes are reported to be a significant component of these systems' annual carbon budgets. However, little information exists on soil CO2 efflux during the non-growing season from alpine ecosystems. Therefore, comparing measurements of soil respiration taken annually versus during the growing season will improve the accuracy of estimating ecosystem carbon budgets, as well as predicting the response of soil CO2 efflux to climate changes. In this study, we measured soil CO2 efflux and its spatial and temporal changes for different altitudes during the non-growing season in an alpine meadow located in the Qilian Mountains, Northwest China. Field experiments on the soil CO2 efflux of alpine meadow from the Qilian Mountains were conducted along an elevation gradient from October 2010 to April 2011. We measured the soil CO2 efflux, and analyzed the effects of soil water content and soil temperature on this measure. The results show that soil CO2 efflux gradually decreased along the elevation gradient during the non-growing season. The daily variation of soil CO2 efflux appeared as a single-peak curve. The soil CO2 efflux was low at night, with the lowest value occurring between 02:00-06:00. Then, values started to rise rapidly between 07:00-08:30, and then descend again between 16:00-18:30. The peak soil CO2 efflux appeared from 11:00 to 16:00. The soil CO2 efflux values gradually decreased from October to February of the next year and started to increase in March. Non-growing season Q(10) (the multiplier to the respiration rate for a 10A degrees C increase in temperature) was increased with raising altitude and average Q(10) of the Qilian Mountains was generally higher than the average growing season Q(10) of the Heihe River Basin. Seasonally, non-growing season soil CO2 efflux was relatively high in October and early spring and low in the winter. The soil CO2 efflux was positively correlated with soil temperature and soil water content. Our results indicate that in alpine ecosystems, soil CO2 efflux continues throughout the non-growing season, and soil respiration is an important component of annual soil CO2 efflux.
关键词	non-growing season soil CO2 efflux spatial and temporal variation alpine meadow Q(10) values Qilian Mountains
学科领域	Environmental Sciences & Ecology
语种	英语
WOS研究方向	Environmental Sciences
来源期刊	JOURNAL OF ARID LAND
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/111696
作者单位	Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, Alashan Desert Ecohydrol Expt Res Stn, Lanzhou 730000, Peoples R China
推荐引用方式 GB/T 7714	Chang, ZongQiang,Liu, XiaoQing,Feng, Qi,et al. Non-growing season soil CO2 efflux and its changes in an alpine meadow ecosystem of the Qilian Mountains, Northwest China[J]. 中国科学院西北生态环境资源研究院,2013,5(4).
APA	Chang, ZongQiang.,Liu, XiaoQing.,Feng, Qi.,Che, ZongXi.,Xi, HaiYang.,...&Si, JianHua.(2013).Non-growing season soil CO2 efflux and its changes in an alpine meadow ecosystem of the Qilian Mountains, Northwest China.JOURNAL OF ARID LAND,5(4).
MLA	Chang, ZongQiang,et al."Non-growing season soil CO2 efflux and its changes in an alpine meadow ecosystem of the Qilian Mountains, Northwest China".JOURNAL OF ARID LAND 5.4(2013).