Productivity depends more on the rate than the frequency of N addition in a temperate grassland

作者: Yunhai Zhang , Jinchao Feng , Forest Isbell , Xiaotao Lü , Xingguo Han

DOI: 10.1038/SREP12558

关键词: PrecipitationAnimal scienceProductivity (ecology)BiologyDeposition (chemistry)Terrestrial ecosystemPrimary productionEcologySteppeTemperate climateAmmonium

摘要: Nitrogen (N) is a key limiting resource for aboveground net primary productivity (ANPP) in diverse terrestrial ecosystems. The relative roles of the rate and frequency (additions yr(-1)) N application stimulating ANPP at both community- species-levels are largely unknown. By independently manipulating input, with nine rates (from 0 to 50 g m(-2) year(-1)) crossed two frequencies (twice year(-1) or monthly) temperate steppe northern China across 2008-2013, we found that addition increased community ANPP, had positive, negative, neutral effects individual species. There were similar responses species-level when particular annual amount was added either twice monthly. less sensitive soil ammonium lower addition. positively correlated precipitation. Our results suggest that, over five-year period, there will be given input occurs frequently small amounts, as from deposition, occur infrequently larger fertilizers.

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