期刊
AGRICULTURAL AND FOREST METEOROLOGY
卷 249, 期 -, 页码 11-21出版社
ELSEVIER
DOI: 10.1016/j.agrformet.2017.11.017
关键词
Normalized difference vegetation index; Soil-adjusted vegetation index; Gross primary production; Aboveground biomass; Climatic change; Alpine grassland
资金
- National Natural Science Foundation of China [31600432, 41571042]
- National Key Research Projects of China [2016YFC0502005]
- Youth Innovation Research Team Project of Key Laboratory of Ecosystem Network Observation and Modeling [LENOM2016Q0002]
The Tibetan Plateau is overall getting warmer and wetter, whereas the relative responses of plant growth to warming and increased precipitation are not fully understood. Therefore, a field warming (control, low- and high-level) and increased precipitation (control, low- and high-level) experiment was conducted to compare the relative effects of warming and increased precipitation on the normalized difference vegetation index (NDVI), soil-adjusted vegetation index (SAVI), aboveground biomass (AGB) and gross primary production (GPP) in an alpine meadow in the Northern Tibetan Plateau since June 2014. The low- and high-level experimental warming significantly decreased soil moisture (SM) by 0.02 m(3) m(-3) and 0.04 m(3) m(-3), but significantly increased air temperature (T-alpha) by 1.91 degrees C and 3.51 degrees C, respectively, across the three growing seasons in 2014-2016. The low- and high-level warming did not significantly affect NDVI, SAVI, AGB and GPP across the three growing seasons in 2014-2016. The low- and high-level increased precipitation did not significantly affect To, but significantly increased SM by 0.02 m(3) M-3 and 0.03 m(3) m(-3), respectively, across the three growing seasons in 2014-2016. The high-level increased precipitation significantly increased NDVI by 18.7%, SAVI by 18.4%, AGB by 11.4% and GPP by 25.0%, whereas the low-level increased precipitation only tended to increase NDVI by 9.8%, SAW by 8.2%, AGB by 6.2% and GPP by 12.9%. Therefore, increased precipitation had stronger effects on NDVI, SAVI, AGB and GPP than did experimental warming in this alpine meadow site of the Northern Tibetan Plateau.
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