地球科学进展 ›› 2008, Vol. 23 ›› Issue (7): 707 -712. doi: 10.11867/j.issn.1001-8166.2008.07.0707

流域水循环的生物学研究 上一篇    下一篇

流域绿水研究的关键科学问题
李小雁 1,2   
  1. 1.地表过程与资源生态国家重点实验室,北京师范大学,北京 100875;2. 北京师范大学资源学院土地资源研究所,北京 100875
  • 收稿日期:2008-05-05 修回日期:2008-05-22 出版日期:2008-07-10
  • 通讯作者: 李小雁 E-mail:xyli@ires.cn
  • 基金资助:

    全国优秀博士学位论文作者专项资金资助项目“半干旱区雨水集流系统主要水文过程与水循环调节机理”(编号:200426);国家自然科学基金项目“荒漠灌木树干茎流的集水机理与生态水文效应”(编号:40571023)资助.

Key Scientific Issues for Green Water Research in the Watershed

Li Xiaoyan 1,2   

  1. 1.State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, China; 2.Institute of Land Resources, College of Resources Sciences and Technology, Beijing Normal University, Beijing 100875, China
  • Received:2008-05-05 Revised:2008-05-22 Online:2008-07-10 Published:2008-07-10
阐述了开展流域绿水研究的重要意义,分析了流域绿水研究的关键科学问题:①绿水量的测算方法与尺度转换;②流域绿水流的形成、转化及其生态水文响应机理;③流域绿水资源评价与管理。指出流域水资源评价与管理要以降水为基本水资源,综合考虑蓝水和绿水两部分,协调流域上、中、下游生态、生产和生活用水,充分开发利用非生产性绿水资源,平衡自然生态和人类用水。

This paper highlighted the importance of research on green water in watershed and proposed key scientific issues for future studies: (1) Estimation or measurement of green water flow and scaling: Green water are considered to comprise both evaporation and transpiration components. The evaporation component is made up of evaporation of intercepted water evaporation from plant surfaces as well as free water surfaces and evaporation from the soil. There are challenges associated with estimating green water flow. First, difficulties exist in determining the spatial and temporal variation of evaporation over large areas. Secondly there are very few methods which allow for estimates of transpiration and evaporation separately. The promising methods for estimates of green water flow may be the application of the scintillation method and remote sensing combination. (2) Formation, transformation and ecohydrological impacts of green water flow in the watershed: Formation of green water is very complicated the in the upper, middle and lower reaches of the watershed due to human activities (land use/cover changes) and climate impacts; in the upper reach of the inland basin of China, green water is mainly transformed into blue water, but in the middle and lower reaches, blue water is mainly transformed into green water, both of them are interlinked in the hydrological cycle on the watershed scale. Researches should also pay attention to unsaturated zone and soil structure quantification for dynamic green water flow in the soil profile, and the spatial scale should include microscopic (e.g., pores aggregates), mesoscopic (e.g., pedons and catenas), and macroscopic (e.g., watersheds, regional, and global) scales. (3) Assessment and management of green water flow: Assessment of green water includes total amount of green water and available green water, which still needs further study. In a word, we need to consider rainfall as the basic water resources and to incorporate green water and blue into integrity to harmonize water consumption for ecological, domestic and productive uses in the upper, middle and lower reaches of the watershed, thus fully exploiting nonproductive green water and balance water between nature and human.

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