草地学报 ›› 2021, Vol. 29 ›› Issue (S1): 80-92.DOI: 10.11733/j.issn.1007-0435.2021.Z1.010

• 研究论文 • 上一篇    下一篇

1995—2014年青藏高原水源涵养功能时空演变特征及其驱动力分析

兰翔宇1,4, 叶冲冲2,4, 王毅3,4, 曾涛1, 孙建4   

  1. 1. 成都理工大学地球科学学院, 四川 成都 610059;
    2. 北京师范大学地理科学学部, 北京 100875;
    3. 中山大学生命科学学院, 广东 广州 510275;
    4. 中国科学院青藏高原研究所青藏高原地球系统科学国家重点实验室, 北京 100101
  • 收稿日期:2021-05-19 修回日期:2021-06-30 出版日期:2021-10-30 发布日期:2021-11-17
  • 通讯作者: 曾涛,E-mail:zengtao@cdut.cn;孙建,E-mail:sunjian@itpcas.ac.cn
  • 作者简介:兰翔宇(1998-),男,汉族,四川乐山人,硕士研究生,主要从事高原植被地理遥感相关研究,E-mail:lanxiangyu1998@163.com
  • 基金资助:
    第二次青藏高原综合科学考察研究项目“生态安全屏障功能与优化体系”(No.2019QZKK0405)资助

Spatiotemporal Variation Characteristics and Its Driving Forces of Water Conservation Function on the Tibetan Plateau from 1995 to 2014

LAN Xiang-yu1,4, YE Chong-chong2,4, WANG Yi3,4, ZENG Tao1, SUN Jian4   

  1. 1. College of Earth Science, Chengdu University of Technology, Chengdu, Sichuan Province 610059, China;
    2. Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China;
    3. School of Life Sciences, Sun Yat-sen University, Guangzhou, Guangdong Province 510275, China;
    4. State Key Laboratory of Tibetan Plateau Earth System Science (LATPES), Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China
  • Received:2021-05-19 Revised:2021-06-30 Online:2021-10-30 Published:2021-11-17

摘要: 青藏高原作为世界第三级,其水源涵养功能面临全球变暖压力,但其时空演变特征及影响因素还需深入研究。本文基于InVEST模型并结合土地覆盖产品,借助相关性和趋势分析等方法,评估了青藏高原产水、径流和水源涵养量的时空演变特征,及其对环境因子的响应。结果表明:青藏高原水源涵养量空间异质性明显(范围为0~1 700 mm)。高寒草原(0.49 mm·a-1)和高寒草甸(1.92 mm·a-1)生态系统水源涵养量均表现为逐年增加,而森林则相反(-5.39 mm·a-1)。水源涵养量在空间上呈现出自雅鲁藏布江河谷向西北逐级递减。驱动力表明水源涵养对土壤湿度最为敏感(0~10 cm:slope=5 327.53,P<0.05;10~40 cm:slope=2 110.42,P<0.05),而地形对不同生态系统水源涵养量有不同影响,在一定坡度范围内(0~20°),水源涵养量随着坡度增大而增加。本文强调森林水源涵养呈现出退化趋势,今后需加强对该生态系统水资源的保护。

关键词: 青藏高原, 产水量, 水源涵养量, InVEST模型, 生态系统

Abstract: As the world's third pole, the water conservation function of the Tibetan Plateau is facing the pressure of global warming, but its spatiotemporal variation characteristics and influencing factors need to be further studied. In this article, based on the InVEST model and connecting with land cover products, using correlation analysis, trend analysis and other analysis methods, the characteristics of spatiotemporal variation of water yield, runoff, and water conservation function of the Tibetan Plateau were evaluated, and their responses to environmental factors were further analyzed. The results showed that the spatial heterogeneity of water conservation in the Tibetan Plateau is significant (range from 0 to 1 700 mm);The water conservation of alpine steppe (0.49 mm·a-1) and alpine meadow (1.92 mm·a-1) ecosystems increased year by year, while that of forest (-5.39 mm·a-1) was the opposite. The spatial pattern showed that the water conservation decreased from the Yarlung Zangbo River valley to the northwest gradually. Driving forces showed that water conservation was most sensitive to soil moisture (soil of 0~10 cm:slope=5 327.53, P < 0.05;soil of 10~40 cm:slope=2 110.42, P < 0.05), and topographic conditions had different influences on water conservation of different ecosystems. In a certain slope range (0~20°), water conservation increased with the increase of slope. This article emphasizes that forest water conservation has a tendency of degradation, and the protection of water resources in this ecosystem should be strengthened in the future.

Key words: Tibetan Plateau, Water yield, Water conservation, InVEST model, Ecosystem

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