中国农业科技导报 ›› 2022, Vol. 24 ›› Issue (10): 169-178.DOI: 10.13304/j.nykjdb.2022.0103

• 生物制造 资源生态 • 上一篇    

毛乌素沙地蒸散发时空分布及影响因素分析

杨亮彦1,2(), 黎雅楠1,2(), 范鸿建1,2, 王雅婷3   

  1. 1.陕西省土地工程建设集团有限责任公司,西安 710075
    2.陕西地建土地工程技术研究院有限责任公司,西安 710021
    3.山东省城乡规划设计研究院有限公司,济南 250013
  • 收稿日期:2022-02-15 接受日期:2022-05-19 出版日期:2022-10-15 发布日期:2022-10-25
  • 通讯作者: 黎雅楠
  • 作者简介:杨亮彦E-mail: 2016127008@chd.edu.cn
  • 基金资助:
    国家自然科学基金项目(42167039);陕西省自然科学基础研究计划项目(2021JM-447);陕西省土地工程建设集团内部项目(DJNY2021-33)

Temporal and Spatial Distribution and Influencing Factors of Evapotranspiration in Mu Us Sandy Land

Liangyan YANG1,2(), Yanan LI1,2(), Hongjian FAN1,2, Yating WANG3   

  1. 1.Shaanxi Provincial Land Engineering Construction Group Co. ,Ltd. ,Xi’an 710075,China
    2.Institute of Land Engineering and Technology,Shaanxi Provincial Land Engineering Construction Group Co. ,Ltd. ,Xi’an 710021,China
    3.Shandong Urban and Rural Planning Design Institute Co. ,Ltd. ,Jinan 250013,China
  • Received:2022-02-15 Accepted:2022-05-19 Online:2022-10-15 Published:2022-10-25
  • Contact: Yanan LI

摘要:

毛乌素沙地存在水资源短缺和生态环境脆弱的问题,探究其蒸散发时空格局可为区域水资源开发利用和生态环境保护提供依据。基于2000—2019年MOD16数据分析毛乌素沙地蒸散发(evapotranspiration,ET)年际变化及其空间分布特征,选取气象数据、植被指数和土地利用/土地覆盖数据,通过趋势和相关系数分析其对ET的影响。结果表明:毛乌素沙地ET在空间上表现出显著的区域差异性,整体呈西北低、东南高的分布规律,2000—2019年的均值为258.8 mm;2000—2019年毛乌素沙地ET呈快速上升趋势,平均变化速率为6.87 mm·a-1; ET与降水量相关系数为0.74,与气温无明显相关性,不同土地利用/覆被的ET存在明显差异性;ET与归一化植被指数(normalized difference vegetation index,NDVI)空间分布和年际变化曲线一致,二者全区域决定系数为0.628 8。在降水量、土地利用/覆被、NDVI等因素共同影响下,2000—2019年毛乌素沙地ET明显增加,其中降水量是毛乌素沙地气候条件的主要因素,NDVI是影响同一时期ET的重要因素。该研究为毛乌素沙地生态水源涵养与保护提供理论基础和科学依据,对研究区落实水资源管理制度和生态环境保护政策具有重要的指导意义。

关键词: 毛乌素沙地, 蒸散发, 时空分布, 影响因素, 气候条件

Abstract:

Mu Us Sandy Land has the problems of water shortage and fragile ecological environment, and exploring its spatial and temporal patterns of evapotranspiration (ET) can provide a basis for regional water resources development and utilization and ecological environmental protection. In this study, the MOD16 data from 2000 to 2019 were used to analyze the interannual variability of ET and its spatial distribution characteristics in Mu Us Sandy Land, China, and then the meteorological data, vegetation index and land use/land cover (LULC) data were used to analyze the factors affecting the change of ET with trend analysis and correlation coefficient. The results showed as follows: the ET of Mu Us Sandy Land showed significant regional variability in space, with an overall distribution pattern of low in the northwest and high in the southeast, and the average value of 258.8 mm from 2000 to 2019; the ET of Mu Us Sandy Land showed a rapid increasing trend from 2000 to 2019, with an average change rate of 6.87 mm·a-1; the correlation coefficient between ET and rainfall was 0.74, with no significant correlation with temperature, and there was significant variability in ET for different LULC, and the spatial distribution and interannual variation curves of ET and normalized difference vegetation index (NDVI) were consistent, with a region-wide determination coefficient of 0.628 8 for both. Under the combined influence of rainfall, LULC and NDVI, ET increased significantly in the Mu Us Sandy Land, where rainfall was the main factor of climatic conditions in the Mu Us Sandy Land, NDVI was an important factor affecting ET in the same period. The study provided theoretical basis and scientific basis for ecological water conservation and protection in the Mu Us Sandy Land, and was an important guide to the implementation of water resources management system and ecological environmental protection policies in the study area.

Key words: Mu Us Sandy Land, evapotranspiration, spatial and temporal distribution, influencing factors, climatic conditions

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