title: Varying responses of vegetation activity to climate changes on the Tibetan Plateau grassland.
abstract: Vegetation activity on the Tibetan Plateau grassland has been substantially enhanced as a result of climate change, as revealed by satellite observations of vegetation greenness (i.e., the normalized difference vegetation index, NDVI). However, little is known about the temporal variations in the relationships between NDVI and temperature and precipitation, and understanding this is essential for predicting how future climate change would affect vegetation activity. Using NDVI data and meteorological records from 1982 to 2011, we found that the inter-annual partial correlation coefficient between growing season (May-September) NDVI and temperature (RNDVI-T) in a 15-year moving window for alpine meadow showed little change, likely caused by the increasing RNDVI-Tin spring (May-June) and autumn (September) and decreasing RNDVI-Tin summer (July-August). Growing season RNDVI-Tfor alpine steppe increased slightly, mainly due to increasing RNDVI-Tin spring and autumn. The partial correlation coefficient between growing season NDVI and precipitation (RNDVI-P) for alpine meadow increased slightly, mainly in spring and summer, and RNDVI-Pfor alpine steppe increased, mainly in spring. Moreover, RNDVI-Tfor the growing season was significantly higher in those 15-year windows with more precipitation for alpine steppe. RNDVI-Pfor the growing season was significantly higher in those 15-year windows with higher temperature, and this tendency was stronger for alpine meadow than for alpine steppe. These results indicate that the impact of warming on vegetation activity of Tibetan Plateau grassland is more positive (or less negative) during periods with more precipitation and that the impact of increasing precipitation is more positive (or less negative) during periods with higher temperature. Such positive effects of the interactions between temperature and precipitation indicate that the projected warmer and wetter future climate will enhance vegetation activity of Tibetan Plateau grassland.
authors.affiliation: Key Laboratory of Alpine Ecology and Biodiversity, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, 16 Lincui Road, Beijing, 100101, China.
authors.forename: Nan
authors.initials: N
authors.lastname: Cong
authors.affiliation: Key Laboratory of Alpine Ecology and Biodiversity, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, 16 Lincui Road, Beijing, 100101, China. shen.miaogen@gmail.com.|CAS Center for Excellence in Tibetan Plateau Earth Sciences, 16 Lincui Road, Beijing, 100101, China. shen.miaogen@gmail.com.
authors.forename: Miaogen
authors.identifier: http://orcid.org/0000-0001-5742-8807
authors.initials: M
authors.lastname: Shen
authors.affiliation: Center for Environmental Remote Sensing, Chiba University, Chiba, 263-8522, Japan.
authors.forename: Wei
authors.initials: W
authors.lastname: Yang
authors.affiliation: Key Laboratory of Alpine Ecology and Biodiversity, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, 16 Lincui Road, Beijing, 100101, China.
authors.forename: Zhiyong
authors.initials: Z
authors.lastname: Yang
authors.affiliation: Key Laboratory of Alpine Ecology and Biodiversity, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, 16 Lincui Road, Beijing, 100101, China.
authors.forename: Gengxin
authors.initials: G
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Alpine Ecology and Biodiversity, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, 16 Lincui Road, Beijing, 100101, China.|CAS Center for Excellence in Tibetan Plateau Earth Sciences, 16 Lincui Road, Beijing, 100101, China.
authors.forename: Shilong
authors.initials: S
authors.lastname: Piao
mesh_terms: D057231:Climate Change; D065948:Grassland; D063245:Plant Development; D013696:Temperature; D018609:Tibet
keywords: Alpine grassland; Climate change; Interaction; Precipitation; Temperature; Tibetan Plateau; Vegetation activity