Global warming and land-use change have profound impacts on soil respiration (R_s), with consequent changes in carbon exchange between terrestrial ecosystem and atmosphere and its feedback to climate change. However, it is not clear how soil respiration and its components (heterotrophic respiration, R_h; and autotrophic respiration, R_a) respond to long-term warming and clipping in alpine meadow, and what are the controlling factors for the responses of soil respiration. To answer these questions, we conducted a field experiment of warming and clipping in an alpine meadow on the Qinghai-Tibet Plateau from 2014 to 2019. Infrared heaters were used to simulate climate warming and plots were clipped once a year to mimic hay or biofuel harvest. The results showed that warming decreased R_h by 5.06% but stimulated R_a by 10.08% across years, while clipping enhanced R_s, R_h and R_a by 12.31%, 18.65% and 1.29%, respectively, and marginally interacted with warming in impacting R_a across the years. Furthermore, the warming effect on soil respiration and its components varied largely over years, which was mostly attributable to the changes in the ratio of above-ground to below-ground net primary productivity (ANPP/BNPP, A/B) and soil temperature. Increased allocation of photosynthate toward below-ground caused the gradual increase in R_a and R_s under long-term warming. While soil temperature changes explained the variation of warming effects on R_h across years. The results demonstrated that soil respiration and its components in the alpine meadow are highly sensitive to climate warming and hay harvest but with large interannual variations in their responses. We highlight that plant carbon allocation is an emerging property in determining soil respiration under climate warming.

全球变暖和土地利用的变化对土壤呼吸（R _s）产生了深远的影响，随之而来的是陆地生态系统与大气之间的碳交换及其对气候变化的反馈的变化。但是，目前尚不清楚土壤呼吸及其组成部分（异养呼吸R _h和自养呼吸R _a）对高寒草甸的长期变暖和剪枝有反应，而土壤呼吸响应的控制因素是什么。为了回答这些问题，我们于2014年至2019年在青藏高原的高山草甸上进行了变暖和修剪的野外实验。红外加热器用于模拟气候变暖，并且每年修剪一次地块以模仿干草或生物燃料的收获。结果表明，随着_时间的推移，变暖使R _h下降了5.06％，但随着_时间的推移刺激了R _a上升了10.08％，而削波使R _s，R _h和R _a分别增加了12.31％，18.65％和1.29％，并且与变暖在边际上有轻微的相互作用。影响R _a这些年来。此外，变暖对土壤呼吸及其成分的影响在过去几年中变化很大，这主要归因于地上净地下初级生产力（ANPP / BNPP，A / B）之比和土壤温度的变化。在长期变暖下，光合产物向地下的分配增加导致R _a和R _s逐渐增加。土壤温度的变化解释了变暖效应对R _h的影响跨年。结果表明，高寒草甸的土壤呼吸及其组成对气候变暖和干草收获高度敏感，但其响应之间存在较大的年际变化。我们着重指出，植物碳分配是确定气候变暖下土壤呼吸作用的新兴属性。