Streamflow response to future climate and land use changes in Xinjiang basin, China

Streamflow response to future climate and land use changes in Xinjiang basin, China
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中国新疆盆地径流对未来气候和土地利用变化的响应

DOI:
10.1007/s12665-016-5805-0
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发表时间:
2016-07
影响因子:
2.8
通讯作者:
Li Lingling
Li Lingling
中科院分区:
环境科学与生态学4区
文献类型:
--
作者:
Yan Renhua;Gao Junfeng;Li Lingling

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气候和土地利用变化对水文循环的影响是影响水生生态系统演变的重要因素。本文利用耦合模式比对项目第五期多模式集成,结合栅格化新安江模式,研究了未来径流对未来气候变化和土地利用变化的响应及其相对效应,模拟了三种气候变化情景下的未来径流(RCP 2.6、RCP 4.5和RCP 8.5)和三种土地利用变化情景(“不变”、“当前速率”和“双倍速率”)。结果表明,2020-2055年期间,秋季和初冬月份的月径流量以5.9%至35.5%的速率大幅增加,但其他月份的月径流量以-5.5%至48.1%的速率减少。在不同的气候和土地利用变化情景下,年径流量也显著减少148-279 mm。气候变化对年径流量和大多数月径流量的相对影响明显高于土地利用变化的影响。然而,随着时间的推移,土地利用变化的影响变得越来越明显,可以减轻1月至8月的气候变化影响,并在其他月份加强这种影响。土地利用变化对径流的相对影响在枯水期大于丰水期。
The effects of climate and land use changes on the hydrological cycle are important factors affecting the evolution of aquatic ecosystems. In this study, the streamflow response to future climate change and land use change and their relative effect is investigated using a Coupled Model Intercomparison Project Phase 5 multi-model ensemble, in conjunction with a raster-based Xin’anjiang model to simulate future streamflows under three climate change scenarios (RCP 2.6, RCP 4.5, and RCP 8.5) and three land use change scenarios (“constant,” “current rate,” and “double rate”) in the Xinjiang basin, China. The results show that the monthly streamflows in the period of 2020–2055 increase substantially at rates ranging from 5.9 to 35.5 % in the autumn and early winter months, but those decrease at rates ranging from −5.5 to −48.1 % in the other months. Annual streamflow also significantly decreases by 148–279 mm under different climate and land use change scenarios. The relative effect of climate change on annual and most monthly streamflows is significantly higher than that of land use change. However, the land use change effect becomes increasingly evident over time and can mitigate the climate change effect from January to August and enhance it in the other months. Moreover, the relative effect of land use change on streamflow is relatively greater in the dry period than that in wet period.
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