The aboveground biomass (AGB) production of grazed grasslands is mediated by climate, soil nutrients, livestock and other factors. How the biotic and abiotic factors directly or indirectly regulate AGB remains unclear. To fill this gap, from 2014 to 2017, we conducted a rotational grazing experiment to examine the response of AGB to biotic and abiotic factors in Nagqu, a typical alpine meadow community on the Qinghai‐Tibetan Plateau. Six yaks were rotationally grazed among three plots from July to September, meanwhile, three plots were set up to exclude from livestock as control; climate, plant biomass, and soil nutrients were investigated during grazing experiment, and then structural equation modeling was used to analyze the regulation of environmental factors on AGB. The results showed that precipitation affected AGB via affecting soil nitrate nitrogen (NO₃‐N), compensatory growth rate, and belowground biomass indirectly; temperature can directly and negatively affected AGB. In contrast grazing exclosure, rotational grazing increased both AGB and its temporal stability in alpine meadow community significantly (p < .05). The temporal stability of the AGB was positively related to the asynchrony between high‐ and low‐palatability herbages (p < .05). In conclusion, rotational grazing should be recommendable for alpine meadow management due to its benefits for community productivity and stability while current stocking rate should be reduced to a reasonable level, especially in a warm and drought year, to sustain plant compensatory growth under grazing.

中文翻译：

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在气候变化的条件下，轮牧放牧促进了草原地上植物的生物量及其时间稳定性

放牧草地的地上生物量（AGB）生产是由气候，土壤养分，牲畜和其他因素介导的。目前尚不清楚生物和非生物因素如何直接或间接调节AGB。为了填补这一空白，从2014年至2017年，我们进行了轮流放牧实验，以检验AGB对那曲（青藏高原典型的高山草甸群落）中生物和非生物因子的响应。从7月至9月，在三个样地中轮流放牧了6头牛，同时，建立了三个样地以将牲畜排除在牲畜之外。在放牧实验中调查了气候，植物生物量和土壤养分，然后使用结构方程模型分析了环境因素对AGB的调节。_3- N），补偿性增长率和间接地下生物量；温度会直接和负面影响AGB。与之相反，在高寒草甸群落中，旋转放牧显着增加了AGB及其时间稳定性（p  <.05）。AGB的时间稳定性与高可食性草和低可食性草之间的异步性呈正相关（p  <.05）。总之，由于高寒草甸有利于社区生产力和稳定，因此应建议对高寒草甸进行轮牧，同时应将目前的放养率降低至合理水平，尤其是在温暖和干旱的年份，以维持放牧下的植物补偿性生长。