首页|Drought decreases the positive impact of warming on an alpine grassland community
Drought decreases the positive impact of warming on an alpine grassland community
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Temperature and precipitation are the main factors determining plant community succession and aboveground net primary productivity(ANPP)in natural grasslands.However,most climate manipulative experiments have mainly focused on their impacts in isolation,especially in alpine regions.Here we explored the relative effects and interaction of warming and precipitation alteration on succession and ANPP using a 7-year experiment involving warming with precipitation alteration(increase(IP)or decrease(DP)in precipitation relative to ambient precipitation(AP))on the Tibetan Plateau.Our results showed that warming and warm-wet conditions increased species richness,diversity index,height and cover of overall species.Conversely,decreasing precipitation reduced them,but increased S.purpurea and the rate of change in community compo-sition.Importantly,warming mitigated the impacts of decreased precipitation on plant community composition,and the interactive effects of warming and altered precipitation on cover,height and plant ANPP varied with year and plant species.Generally,warming increased community ANPP through increases in forb ANPP or non-dominant species ANPP and bio-diversity regardless of change in precipitation.However,decreased precipitation reduced community ANPP via decreases in the ANPP of sedges and forbs and biodiversity.Precipitation alteration affected the relationship between biodiversity and community ANPP regardless of warming(IP＜AP＜DP).Therefore,generally warming and decreased precipitation have op-posite effects on ANPP in the alpine grassland,suggesting that warming mitigated the negative impacts of drought on the ANPP of the alpine grassland.
Alpine grasslandClimate warmingPrecipitation alterationCommunity compositionBiodiversityAbove-ground net primary productivity
Wang A、Wangwang LV、Yang ZHOU、Bowen LI、Jianping SUN、Jingya LV、Lanying CHEN、Dorji TSECHEO、Shiping WANG
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Key Laboratory of Tibetan Plateau Earth,Resources and Environment,Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing 100101,China
University of the Chinese Academy of Sciences,Beijing 100049,China
School of Ecology and Environment,Tibet University,Lhasa 850000,China
School of Ecology and Environment,Tibet University Lhasa 850000,China
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