Climate change may accelerate the decline of desert riparian forest in the lower Tarim River, Northwestern China: Evidence from tree-rings of Populus euphratica
Climate change may accelerate the decline of desert riparian forest in the lower Tarim River, Northwestern China: Evidence from tree-rings of Populus euphratica
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DOI：
10.1016/j.ecolind.2019.105997
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发表时间：
2020-04
影响因子：
6.9
通讯作者：
Honghua Zhou;Yaning Chen;Cheng-gang Zhu;Zhi Li;G. Fang;Yupeng Li;A. Fu
中科院分区：
文献类型：
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作者：
Honghua Zhou;Yaning Chen;Cheng-gang Zhu;Zhi Li;G. Fang;Yupeng Li;A. Fu
尽管气候变化已成为生物多样性的主要威胁，但对极端干旱平原地区沙漠河岸森林对气候的敏感性的评估却很少。我们绘制了树木生长与气候的相关性（时间段：1957-2015），以确定胡杨（P. euphratica）对气候变化的敏感性，胡杨是中国极端干旱地区塔里木河下游荒漠河岸森林的优势和重要树种。结果表明，地下水埋深是控制研究区树木生长的关键因素。为了准确评估荒漠河岸森林对气候变化的敏感性，需要考虑水文波动对P的影响。因为树木生长对降水和温度的敏感性取决于地下水环境的变化。区分气候变化对P敏感性的地下水深度阈值。胡发生长为 6-7 m。此外，当地下水埋深超过6 m时，变暖会加速荒漠河岸森林的衰退，因为异常高温会加剧蒸散量和生长季土壤水分的短缺，抵消降水带来的好处，如果地下水没有得到足够的径流补偿，就会导致更严重的干旱。因此，如果塔里木河下游没有固定时间和水量的生态输水工程（EWCP）目前的模式继续实施，全球变暖将对荒漠河岸森林带来极大的不利，不能稳定减少并积极维持浅层地下水埋深。
Although climate change has emerged as a major threat to biodiversity, few assessments exist of the sensitivity of desert riparian forests to climate in extremely arid plain areas. We mapped tree growth-climate correlations (time period: 1957–2015) to identify the sensitivities ofPopulus euphratica(P. euphratica), a dominant and important tree species in the desert riparian forest in the lower Tarim River, an extremely arid area in China, to climate change. The results indicated that groundwater depth was the key factor for controlling tree growth in the study area. In order to accurately assess sensitivity to climate change of the desert riparian forest, it was necessary to consider the effects of hydrological fluctuations onP. euphraticabecause the sensitivities of tree growth to precipitation and temperature depended on changes in the groundwater environment. The groundwater depth threshold to distinguish the sensitivity of climate change toP. euphraticagrowth was 6–7 m. Moreover, warming would accelerate desert riparian forest decline when the groundwater depth was more than 6 m because an anomalously high temperature would intensify evapotranspiration and the shortage of soil moisture during the growing season, and offset the benefits from precipitation, which would cause more drought if groundwater was not compensated by sufficient runoff. Therefore, global warming would bring great disadvantages to desert riparian forests if the current mode of the ecological water conveyance project (EWCP) continues to be implemented without a fixed time and water amount in the lower Tarim River, which could not steadily decrease and actively maintain shallow groundwater depth.