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1. chinaXiv:202006.00208 [pdf]

水资源约束下的渭干河流域耕地适宜规模

柯映明; 沈占锋; 白洁; 李均力; 常存; 许泽宇
Subjects: Environmental Sciences, Resource Sciences >> Basic Disciplines of Environmental Science and Technology

利用遥感、水文、气象、统计年鉴等数据,基于水量平衡原理建立以生态耗水为主要水资源约束条件的耕地适宜规模模型,以渭干河流域为研究对象,估算1990—2017年4期耕地适宜面积并评价其开发潜力。结果表明:① 1990—2017年渭干河流域耕地面积持续增加,其转化来源以灌木林、草地为主。② 流域水源主要来自地表径流与可利用降水,流域耗水以生态耗水为主。③ 来水量、作物种植结构与节水灌溉是影响适宜耕地面积估算的主要因素。④ 1990年耕地达到相对饱和状态;2000年耕地水平不稳定,其扩张影响生态环境的平衡;随着作物种植结构调整与节水灌溉普及,2010、2017年实际耕地面积远小于其当年来水量下适宜耕地面积,未来耕地具有较大开发潜力。

submitted time 2020-06-19 From cooperative journals:《干旱区研究》 Hits646Downloads389 Comment 0

2. chinaXiv:201906.00048 [pdf]

Effects of land use and cover change on surface wind speed in China

LI Yupeng
Subjects: Geosciences >> Geography

The surface wind speed (SWS) is affected by both large-scale circulation and land use and cover change (LUCC). In China, most studies have considered the effect of large-scale circulation rather than LUCC on SWS. In this study, we evaluated the effects of LUCC on the SWS decrease during 1979–2015 over China using the observation minus reanalysis (OMR) method. There were two key findings: (1) Observed wind speed declined significantly at a rate of 0.0112 m/(s?a), whereas ERA-Interim, which can only capture the inter-annual variation of observed data, indicated a gentle downward trend. The effects of LUCC on SWS were distinct and caused a decrease of 0.0124 m/(s?a) in SWS; (2) Due to variations in the characteristics of land use types across different regions, the influence of LUCC on SWS also varied. The observed wind speed showed a rapid decline over cultivated land in Northwest China, as well as a decrease in China's northeastern and eastern plain regions due to the urbanization. However, in the Tibetan Plateau, the impact of LUCC on wind speed was only slight and can thus be ignored.

submitted time 2019-06-20 From cooperative journals:《Journal of Arid Land》 Hits7777Downloads996 Comment 0

3. chinaXiv:201806.00042 [pdf]

黑河径流对LUCC和气候变化的敏感性分析

罗开盛; 陶福禄
Subjects: Environmental Sciences, Resource Sciences >> Basic Disciplines of Environmental Science and Technology

为了定量评估径流对土地利用变化(LUCC)和气候变化的敏感性及其时空变异,基于土地利用、土壤、数字高程(DEM)、气象和实测径流数据,借助SWAT模型并结合统计方法定量评估了黑河径流对LUCC和气候变化的敏感性。结果表明:1980—2009年流域径流对LUCC的敏感性值为0.020 mm·km-2。径流对LUCC的敏感性从大到小分别是上游(0.108 mm·km-2)、中游(0.004 mm·km-2)和下游(0.001 mm·km-2)。1 mm降雨变化在上游、中游和下游引起的产水量变化分别是0.49~0.288 mm、0.006~0.038 mm和0~0.002 mm。1℃气温变化在上游、中游和下游引起的产水量变化分别是13.413~78.902mm、1.105~6.500 mm和0.461~2.710 mm。径流对气温的敏感程度要远远高于对降水的敏感度。在时间趋势上,径流对LUCC的敏感性表现出下降趋势;上游表现出减少趋势,而下游表现出增加趋势。流域径流对气温的敏感性表现为上升趋势。

submitted time 2018-06-10 From cooperative journals:《干旱区研究》 Hits721Downloads377 Comment 0

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