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作 者:黄强[1] 郭雯雯 黄生志[1] 李沛[1] 冷昱霖 HUANG Qiang;GUO Wenwen;HUANG Shengzhi;LI Pei;LENG Yulin(State Key Laboratory of Eco-Hydraulics in Northwest Arid Region of China,Xi’an University of Technology,Xi’an 710048,China)
机构地区:[1]西安理工大学西北旱区生态水利国家重点实验室,陕西西安710048
出 处:《人民黄河》2023年第9期31-37,共7页Yellow River
基 金:国家自然科学基金资助项目(5227090529);陕西省自然科学基础研究计划项目(2023JC-XJ-19)。
摘 要:研究叶面积指数(LAI)对土壤水分亏缺的敏感性及其影响因素,对黄河流域生态保护与生态恢复具有重要意义。以黄河流域为研究对象,基于1982—2018年月尺度土壤湿度数据,计算了标准化土壤湿度指数(SSI),阐明了黄河流域植被变化特征及对不同程度土壤水分亏缺的敏感性,并探究了影响敏感性的主导因素。结果表明:在植被生长季(4—10月),各月LAI整体呈显著增大趋势,其中植树造林重点区LAI的增大趋势最为显著;6—10月植被对土壤水分的敏感性高,1—3月、12月植被受土壤水分胁迫的敏感性高值区位于黄河上游,4—11月植被易受损失区域位于内蒙古东北部、宁夏和陕西北部;气温、潜在蒸散发和植被光合有效辐射吸收系数是影响植被对土壤水分响应的主要驱动因素。Studying the sensitivity of leaf area index(LAI)to the soil moisture deficit and its influencing factors is of great significance for the ecological conservation and restoration in the Yellow River Basin.In this study,taking the Yellow River Basin as the research area,the standardized soil moisture index(SSI)was calculated based on the monthly soil moisture data from 1982 to 2018 and then the characteristics of vegetation changes and the sensitivity of the vegetation to the different degrees of soil moisture deficit in the Yellow River Basin were analyzed.On this basis,we investigated the dominant factors affecting the sensitivity.The results show that the monthly LAI shows a significant increasing trend in the vegetation growing season(April to October),with the most significant increase in the key areas of afforestation.The sensitivity of vegetation to soil moisture deficit is high from June to October,spatially,the areas with high sensitivity of vegetation to soil moisture deficit in the period from January to March as well as in December are located in the upper reaches of the Yellow River,and the areas susceptible to vegetation loss are located in the northeastern Inner Mongolia,Ningxia region and the northern Shaanxi from April to November.Temperature,potential evapotranspiration and fraction of photosynthetically active radiation of vegetation are the main drivers affecting vegetation response to soil moisture.
分 类 号:Q948[生物学—植物学] TV882.1[水利工程—水利水电工程]
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