气候变化领域集成服务门户(CCPortal): Spatiotemporal Variability of Soil Temperature and Moisture across two Contrasting Timberline Ecotones in the Sergyemla Mountains, Southeast Tibet

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DOI	10.1657/1938-4246-43.2.229
	Spatiotemporal Variability of Soil Temperature and Moisture across two Contrasting Timberline Ecotones in the Sergyemla Mountains, Southeast Tibet
	Liu, Xinsheng; Luo, Tianxiang
通讯作者	Luo, TX (通讯作者)
发表日期	2011
ISSN	1523-0430
EISSN	1938-4246
起始页码	229
结束页码	238
卷号	43 期号:2
英文摘要	Simultaneous measurements of soil temperature and moisture and related climate and vegetation variables at high altitudes are rare. Such knowledge is important to predict soil temperature and moisture across heterogeneous alpine landscapes and the impact of climate warming on alpine ecosystems. Based on the four-year observations in 12 plots across two contrasting timberline ecotones (north-facing Abies georgei var. smithii and south-facing Juniperus saltuaria timberlines of a valley) in the Sergyemla Mountains, we aimed to determine the role of altitude, aspect, climate, soil, and vegetation variables affecting the variability of soil temperature and moisture. The two timberlines had similar annual precipitation and seasonal mean air temperature, but the growing-season mean soil temperature differed by 0.8-1.0 K. The spring soil warming date was 20-30 days later on the north-facing slope than on the south-facing slope, which was associated with increased snow and vegetation covers on the north-facing slope. Slope aspect, canopy height, and leaf area index (LAI) rather than altitude were the major determining factors for spatial variability of seasonal mean soil temperatures across plots. A combination of aspect southness and canopy height/LAI explained 56-77% of the variations in the -20 cm mean soil temperatures for the year, growing season, and July across the 12 plots. In contrast, seasonal mean soil moistures did not correlate with altitude, aspect, and stand and soil variables. Furthermore, the -5 cm soil temperature amplitude in the growing season was much lower in the north-facing fir forest than in the south-facing juniper forest, suggesting an explanation for the distribution pattern of both species timberlines on opposite slopes of a valley in the Sergyemla Mountains.
关键词	PRIMARY PRODUCTIVITY TREELINE VEGETATION GROWTH ELEVATION INTERIOR CLIMATE AIR SEEDLINGS CAPACITY
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Physical Geography
WOS类目	Environmental Sciences ; Geography, Physical
WOS记录号	WOS:000291118700008
来源期刊	ARCTIC ANTARCTIC AND ALPINE RESEARCH
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/257846
推荐引用方式 GB/T 7714	Liu, Xinsheng,Luo, Tianxiang. Spatiotemporal Variability of Soil Temperature and Moisture across two Contrasting Timberline Ecotones in the Sergyemla Mountains, Southeast Tibet[J]. 中国科学院青藏高原研究所,2011,43(2).
APA	Liu, Xinsheng,&Luo, Tianxiang.(2011).Spatiotemporal Variability of Soil Temperature and Moisture across two Contrasting Timberline Ecotones in the Sergyemla Mountains, Southeast Tibet.ARCTIC ANTARCTIC AND ALPINE RESEARCH,43(2).
MLA	Liu, Xinsheng,et al."Spatiotemporal Variability of Soil Temperature and Moisture across two Contrasting Timberline Ecotones in the Sergyemla Mountains, Southeast Tibet".ARCTIC ANTARCTIC AND ALPINE RESEARCH 43.2(2011).