Universität zu Köln

Wang, Lei, Liu, Huizhi ORCID: 0000-0003-2875-419X, Shao, Yaping ORCID: 0000-0002-2041-5479, Liu, Yang and Sun, Jihua (2018). Water and CO2 fluxes over semiarid alpine steppe and humid alpine meadow ecosystems on the Tibetan Plateau. Theor. Appl. Climatol., 131 (1-2). S. 547 - 557. WIEN: SPRINGER WIEN. ISSN 1434-4483

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Abstract

Based on eddy covariance flux data from July 15, 2014, to December 31, 2015, the water and CO2 fluxes were compared over a semiarid alpine steppe (Bange, Tibetan Plateau) and a humid alpine meadow (Lijiang, Yunnan) on the Tibetan Plateau and its surrounding region. During the wet season, the evaporative fraction (EF) was strongly and linearly correlated with the soil water content (SWC) at Bange because of its sparse green grass cover. In contrast, the correlation between the EF at Lijiang and the SWC and the normalized difference vegetation index (NDVI) was very low because the atmosphere was close to saturation and the EF was relatively constant. In the dry season, the EF at both sites decreased with the SWC. The net ecosystem exchange (NEE) at Bange was largely depressed at noon, while this phenomenon did not occur at Lijiang. The saturated NEE at Bange was 24% of that at Lijiang. The temperature sensitivity coefficient of ecosystem respiration at Bange (1.7) was also much lower than that at Lijiang (3.4). The annual total NEE in 2015 was 21.8 and -230.0 g C m(-2) yr(-1) at Bange and Lijiang, respectively, and the NEE was tightly controlled by the NDVI at the two sites. The distinct differences in the water and CO2 fluxes at Bange and Lijiang are attributed to the large SWC difference and its effect on vegetation growth.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Wang, Lei UNSPECIFIED UNSPECIFIED UNSPECIFIED Liu, Huizhi UNSPECIFIED orcid.org/0000-0003-2875-419X UNSPECIFIED Shao, Yaping UNSPECIFIED orcid.org/0000-0002-2041-5479 UNSPECIFIED Liu, Yang UNSPECIFIED UNSPECIFIED UNSPECIFIED Sun, Jihua UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-201071
DOI:	10.1007/s00704-016-1997-1
Journal or Publication Title:	Theor. Appl. Climatol.
Volume:	131
Number:	1-2
Page Range:	S. 547 - 557
Date:	2018
Publisher:	SPRINGER WIEN
Place of Publication:	WIEN
ISSN:	1434-4483
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Geosciences > Institute for Geophysics and Meteorology
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language CARBON-DIOXIDE EXCHANGE; ATMOSPHERIC CONTROLS; SONIC ANEMOMETER; SOUTHWEST CHINA; SURFACE; GRASSLAND; HEAT; EVAPOTRANSPIRATION Multiple languages Meteorology & Atmospheric Sciences Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/20107