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Ying Yong Sheng Tai Xue Bao. 2018 Jun;29(6):1822-1828. doi: 10.13287/j.1001-9332.201806.009.

[Effects of precipitation changes on the precipitation use efficiency and aboveground productivity of alpine steppe-meadow on northern Tibetan Plateau, China.]

[Article in Chinese; Abstract available in Chinese from the publisher]
Wang ZP1,2, Zhang XZ1,3, He YT1,3, Shi PL1,3, Zu JX1,2, Niu B1,2, Li M1,2.

Author information

1
Lhasa Plateau Ecological Research Station, Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China.
2
University of Chinese Academy of Sciences, Beijing 100049, China.
3
Colllege of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100190, China.

Abstract

in English, Chinese

Total amount, distribution pattern and occurrence time of precipitation determine the water condition of alpine vegetation growth on the Tibetan Plateau, China. Precipitation use efficiency (the ratio of aboveground productivity to precipitation, PUE) is an effective indicator for the relationship between precipitation and vegetation productivity. In this study, we calculated aboveground net primary productivity (ANPP) of an alpine steppe-meadow in northern Tibetan Plateau from 2000 to 2016 based on the correlation model between long-term monitoring biomass data and enhanced vegetation index (EVI) in Damxung. Meteorological data during the same period was also analyzed. Growing season precipitation (GSP) represented the amount of precipitation, improved precipitation concentrated index (PCI) indicated their distribution pattern in the growing season, and precipitation centroid (PC) represented the time of precipitation occurrence. Structural equation model was used to explore the effects of climatic factors on PUE and ANPP, with the consideration of growing season temperature (GST). Results showed that ANPP of this alpine steppe-meadow was mainly controlled by precipitation during the growing season. GSP and ANPP showed significantly positive correlation, whereas the correlation of GST with PUE and ANPP was not significant. PCI and PUE showed significantly positive correlation, which indicated that concentrated distribution of precipitation was beneficial to the increase of PUE. Indirect coefficient between PCI and ANPP was greater than direct coefficient, indicating that PCI influenced ANPP through PUE. Changes of precipitation concentrated time did not show significant effect on PUE and ANPP. Our results suggested that under the rapid climate warming on the Tibetan Plateau, future changes of precipitation and their concentration would have important impacts on aboveground productivity of the alpine grassland.

KEYWORDS:

aboveground productivity; alpine steppe-meadow; precipitation centroid; precipitation concentrated index; precipitation use efficiency

PMID:
29974690
DOI:
10.13287/j.1001-9332.201806.009
[Indexed for MEDLINE]

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