干旱区生态环境知识资源中心(Arid): Variations in diurnal and seasonal net ecosystem carbon dioxide exchange in a semiarid sandy grassland ecosystem in China's Horqin Sandy Land

Arid

DOI	10.5194/bg-17-6309-2020
	Variations in diurnal and seasonal net ecosystem carbon dioxide exchange in a semiarid sandy grassland ecosystem in China's Horqin Sandy Land
	Niu, Yayi; Li, Yuqiang; Yun, Hanbo; Wang, Xuyang; Gong, Xiangwen; Duan, Yulong; Liu, Jing
通讯作者	Niu, YY ; Li, YQ (corresponding author), Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Lanzhou 730000, Peoples R China. ; Niu, YY ; Li, YQ (corresponding author), Univ Chinese Acad Sci, Beijing 100049, Peoples R China. ; Niu, YY ; Li, YQ (corresponding author), Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Naiman Desertificat Res Stn, Tongliao 028300, Peoples R China. ; Niu, YY (corresponding author), Univ Copenhagen, Ctr Permafrost CENPERM, Dept Geosci & Nat Resource Management, DK-1350 Copenhagen, Denmark.
来源期刊	BIOGEOSCIENCES
ISSN	1726-4170
EISSN	1726-4189
出版年	2020
卷号	17 期号:24 页码:6309-6326
英文摘要	Grasslands are major terrestrial ecosystems in arid and semiarid regions, and they play important roles in the regional carbon dioxide (CO2) balance and cycles. Sandy grasslands are sensitive to climate change, yet the magnitudes, patterns, and environmental controls of their CO2 flows are poorly understood for some regions (e.g., China's Horqin Sandy Land). Here, we report the results from continuous year-round CO2 flux measurements for 5 years from a sandy grassland in China's Horqin Sandy Land. The grassland was a net CO2 source at an annual scale with a mean annual net ecosystem CO2 exchange (NEE) of 49 +/- 8 gCm(-2) yr(-1) for the years for which a complete dataset was available (2015, 2016, and 2018). Annual precipitation had the strongest effect on annual NEE; grassland carbon sequestration increased with the increasing precipitation since NEE depended on annual precipitation. In the spring, NEE decreased (i.e., C sequestration increased) with increasing magnitude of effective precipitation pulses, total monthly precipitation, and soil temperature (T-soil). In the summer, NEE was dominated by the total seasonal precipitation and high precipitation pulses (> 20 mm). In the autumn, NEE increased (i.e., C sequestration decreased) with increasing effective precipitation pulses, T-soil, and near-surface soil water content (SWC) but decreased with increased SWC deeper in the soil. In the winter, NEE decreased with increasing T-soil and SWC. The sandy grassland was a net annual CO2 source because drought decreased carbon sequestration by the annual plants. Long-term observations will be necessary to reveal the true source or sink intensity and its response to environmental and biological factors.
类型	Article
语种	英语
开放获取类型	Green Submitted, gold
收录类别	SCI-E
WOS记录号	WOS:000600068700001
WOS关键词	CO2 EXCHANGE ; INTERANNUAL VARIABILITY ; PRECIPITATION PULSES ; GRAZING EXCLUSION ; WATER-USE ; PRIMARY PRODUCTIVITY ; NORTHEASTERN CHINA ; FLUX MEASUREMENTS ; SOIL RESPIRATION ; BAJA-CALIFORNIA
WOS类目	Ecology ; Geosciences, Multidisciplinary
WOS研究方向	Environmental Sciences & Ecology ; Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/369157
作者单位	[Niu, Yayi; Li, Yuqiang; Yun, Hanbo; Wang, Xuyang; Gong, Xiangwen; Duan, Yulong; Liu, Jing] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Lanzhou 730000, Peoples R China; [Niu, Yayi; Li, Yuqiang; Wang, Xuyang; Gong, Xiangwen; Duan, Yulong] Univ Chinese Acad Sci, Beijing 100049, Peoples R China; [Niu, Yayi; Li, Yuqiang; Wang, Xuyang; Duan, Yulong] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Naiman Desertificat Res Stn, Tongliao 028300, Peoples R China; [Yun, Hanbo] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Frozen Soil Engn, Lanzhou 730000, Gansu, Peoples R China; [Niu, Yayi; Yun, Hanbo] Univ Copenhagen, Ctr Permafrost CENPERM, Dept Geosci & Nat Resource Management, DK-1350 Copenhagen, Denmark
推荐引用方式 GB/T 7714	Niu, Yayi,Li, Yuqiang,Yun, Hanbo,et al. Variations in diurnal and seasonal net ecosystem carbon dioxide exchange in a semiarid sandy grassland ecosystem in China's Horqin Sandy Land[J],2020,17(24):6309-6326.
APA	Niu, Yayi.,Li, Yuqiang.,Yun, Hanbo.,Wang, Xuyang.,Gong, Xiangwen.,...&Liu, Jing.(2020).Variations in diurnal and seasonal net ecosystem carbon dioxide exchange in a semiarid sandy grassland ecosystem in China's Horqin Sandy Land.BIOGEOSCIENCES,17(24),6309-6326.
MLA	Niu, Yayi,et al."Variations in diurnal and seasonal net ecosystem carbon dioxide exchange in a semiarid sandy grassland ecosystem in China's Horqin Sandy Land".BIOGEOSCIENCES 17.24(2020):6309-6326.