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首页> 外文期刊>Agricultural and Forest Meteorology >The impact of climate change and anthropogenic activities on alpine grassland over the Qinghai-Tibet Plateau.
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The impact of climate change and anthropogenic activities on alpine grassland over the Qinghai-Tibet Plateau.

机译：气候变化和人类活动对青藏高原高寒草地的影响。

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Climate change and anthropogenic activities are two factors that have important effects on the carbon cycle of terrestrial ecosystems, but it is almost impossible to fully separate them at present. This study used process-based terrestrial ecosystem model to stimulate the potential climate-driven alpine grassland net primary production (NPP), and Carnegie-Ames-Stanford Approach based on remote sensing to stimulate actual alpine grassland NPP influenced by both of climate change and anthropogenic activities over the Qinghai-Tibet plateau (QTP) from 1982 to 2011. After the models were systematically calibrated, the simulations were validated with continuous 3-year paired field sample data, which were separately collected in fenced and open grasslands. We then simulated the human-induced NPP, calculated as the difference between potential and actual NPP, to determine the effect of anthropogenic activities on the alpine grassland ecosystem. The simulation results showed that the climate change and anthropogenic activities mainly drove the actual grassland NPP increasing in the first 20-year and the last 10-year respectively, the area percentage of actual grassland NPP change caused by climate change declined from 79.62% in the period of 1982-2001 to 56.59% over the last 10 years; but the percentage change resulting from human activities doubled from 20.16% to 42.98% in the same periods over the QTP. The effect of human activities on the alpine grassland ecosystem obviously intensified in the latter period compared with the former 20 years, so the negative effect caused by climate change to ecosystem could have been relatively mitigated or offset over the QTP in the last ten years.
机译：气候变化和人为活动是对陆地生态系统碳循环产生重要影响的两个因素，但目前几乎不可能将它们完全分开。这项研究使用基于过程的陆地生态系统模型来刺激潜在的气候驱动的高山草原净初级生产（NPP），并使用基于遥感的卡内基-艾姆斯-斯坦福方法来刺激受气候变化和人为因素影响的实际高山草原NPP在1982年至2011年期间，青藏高原地区（QTP）开展了一系列活动。对模型进行了系统校准后，使用连续3年的成对野外采样数据对模拟进行了验证，该数据分别在围栏和开阔的草地上收集。然后，我们模拟了人为产生的NPP，将其计算为潜在NPP与实际NPP之差，以确定人为活动对高寒草原生态系统的影响。模拟结果表明，气候变化和人为活动分别导致实际草地净初级生产力的增长分别在前20年和最后10年内，由气候变化引起的实际草地NPP的改变的面积百分比从2000年的79.62％下降。从1982年到2001年的10年间达到56.59％;但同期，由于人类活动导致的百分比变化从20.16％翻了一番，达到42.98％。与前20年相比，人类活动对高寒草原生态系统的影响在后期显着增强，因此在过去的10年中，气候变化对生态系统的负面影响本来可以得到缓解或抵消。

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