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| DOI：10.13522/j.cnki.ggps.2019332 |
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| Estimation of Ecological Water Requirement for the Natural Vegetation in the Kongque River Basin based on Vegetation Evapotranspiration |
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YANG Yuanyuan1, 2, XU Changchun1, 2*, LUO Yingxue1, 2, YANG Qiuping1, 2, CHEN Li1, 2
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1. College of Resources and Environmental Sciences, Xinjiang University, Urumqi 830046, China; 2.Key Laboratory of Oasis Ecology under Ministry of Education, College of Resources and Environmental Sciences, Urumqi 830046, China
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| Abstract: |
| 【Objective】 Quantitative ecological water requirement of natural vegetation provides scientific basis and reference for rational allocation and use of limited water resources in basin.【Method】Using FAO56 Penman-Monteith formula and the drought intensity index (DSI), the spatio-temporal variation characteristics of ecological water requirement of natural vegetation in Kongque River basin, Xinjiang from 2000 to 2016 were analyzed and the ecological water requirement of natural vegetation under different dry and wet conditions was calculated.【Result】①The average annual ecological water requirement of the natural vegetation growing season in the study area is 7.575 7×108 m3, and the water demand of natural grassland exceeds that of natural forest land.②From the perspective of time, the total ecological water requirement in the natural vegetation growing season in the last 17 years shows a rising-falling trend as a whole and the demarcation point occurs in 2006. As for the variation characteristics of the growing season, the ecological water requirement of the natural vegetation in the study area is mainly concentrated in June-August, accounting for 69.64% of the total water requirement in the main growing season of the vegetation. From the From the perspective of space, the ecological water requirement of the natural vegetation in the Kongque River Basin is mainly concentrated in the periphery of the agricultural area in the oasis and on both sides of the middle and upper reaches of the river. ③Under different dry and wet conditions, the average ecological water requirement per unit area of natural forest land and grassland shows the following rules: normal year > wet year > mild dry drought year > extreme drought year. The total amount of natural vegetation ecological water requirement shows: extreme drought years>normal years> mild drought years> wet years.【Conclusion】There are differences in the ecological water requirement of natural vegetation under different dry and wet conditions, and the change of climate factors and natural vegetation area is the main factor leading to the difference of ecological water requirement. |
| Key words: Penman-Monteith; ecological water requirement; natural vegetation; Kongque river |
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