气候变化领域集成服务门户(CCPortal): Climate Change and Water Use Partitioning by Different Plant Functional Groups in a Grassland on the Tibetan Plateau

CCPortal

DOI	10.1371/journal.pone.0075503
	Climate Change and Water Use Partitioning by Different Plant Functional Groups in a Grassland on the Tibetan Plateau
	Hu, Jia; Hopping, Kelly A.; Bump, Joseph K.; Kang, Sichang; Klein, Julia A.
通讯作者	Hu, J (通讯作者)
发表日期	2013
ISSN	1932-6203
卷号	8 期号:9
英文摘要	Tibetan Plateau (TP) is predicted to experience increases in air temperature, increases in snowfall, and decreases in monsoon rains; however, there is currently a paucity of data that examine the ecological responses to such climate changes. In this study, we examined the effects of increased air temperature and snowfall on: 1) water use partitioning by different plant functional groups, and 2) ecosystem CO2 fluxes throughout the growing season. At the individual plant scale, we used stable hydrogen isotopes (delta D) to partition water use between shallow-and deep-rooted species. Prior to the arrival of summer precipitation (typically mid-July), snowmelt was the main water source in the soils. During this time, shallow and deep-rooted species partitioned water use by accessing water from shallow and deep soils, respectively. However, once the monsoon rains arrived, all plants used rainwater from the upper soils as the main water source. Snow addition did not result in increased snowmelt use throughout the growing season; instead, snowmelt water was pushed down into deeper soils when the rains arrived. At the larger plot scale, CO2 flux measurements demonstrated that rain was the main driver for net ecosystem productivity (NEP). NEP rates were low during June and July and reached a maximum during the monsoon season in August. Warming decreased NEP through a reduction in gross primary productivity (GPP), and snow additions did not mitigate the negative effects of warming by increasing NEP or GPP. Both the isotope and CO2 flux results suggest that rain drives productivity in the Nam Tso region on the TP. This also suggests that the effects of warming-induced drought on the TP may not be mitigated by increased snowfall. Further decreases in summer monsoon rains may affect ecosystem productivity, with large implications for livestock-based livelihoods.
关键词	ARCTIC TUNDRA SOIL-MOISTURE CO2 FLUX HIGH-ELEVATION LONG-TERM KOBRESIA-PYGMAEA STABLE-ISOTOPES FIELD RESPONSES CARBON STORAGE WINTER SNOW
语种	英语
WOS研究方向	Science & Technology - Other Topics
WOS类目	Multidisciplinary Sciences
WOS记录号	WOS:000324547300086
来源期刊	PLOS ONE
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258211
推荐引用方式 GB/T 7714	Hu, Jia,Hopping, Kelly A.,Bump, Joseph K.,et al. Climate Change and Water Use Partitioning by Different Plant Functional Groups in a Grassland on the Tibetan Plateau[J]. 中国科学院青藏高原研究所,2013,8(9).
APA	Hu, Jia,Hopping, Kelly A.,Bump, Joseph K.,Kang, Sichang,&Klein, Julia A..(2013).Climate Change and Water Use Partitioning by Different Plant Functional Groups in a Grassland on the Tibetan Plateau.PLOS ONE,8(9).
MLA	Hu, Jia,et al."Climate Change and Water Use Partitioning by Different Plant Functional Groups in a Grassland on the Tibetan Plateau".PLOS ONE 8.9(2013).