Ecological Water Demand of Vegetation Based on Eco-hydrological Processes in the Lower Reaches of Tarim River
Received date: 2006-12-23
Revised date: 2007-03-20
Online published: 2007-05-25
Supported by
Knowledge Innovation Program of CAS, No.KZCX2-YW-127; National Natural Science Foundation of China, No.90502004; No.40671014; National Science and Technology Support Plan, No.2006BAC01A03; National Basic Research Program of China, No.2004CB720200
This paper appraised the relationships between soil moisture, groundwater depth and plant species diversity in the lower reaches of the Tarim River, western China, by analyzing the field data from 25 monitoring wells across eight study sites and 25 vegetation survey plots in 2005. The results showed that groundwater depth, soil moisture and plant species diversity had close relativity. It was proved that the critical phreatic water depth was 5 m in the lower reaches of the Tarim River. Averaging the two results of the phreatic evaporations calculated by Аверъянов formula and Qunke formula, the mean phreatic evaporations of different groundwater levels in each month were acquired. Based on the calculation of two methods of vegetation acreage classification, the total ecological water demand (EWD) of natural vegetation was 3.2×108 m3 in the lower reaches of the Tarim River. Analyzing the monthly EWD, it was found that the EWD in the growth season (from April to September) was 81% of the year's total, with May, June and July accounting for 47% of the year's total, which would supply a gist for choosing the best time to deliver water. This research aimed to realize water resources sustainable development and provide scientific basis for water resource management and sound collocation of the Tarim River Basin.
YE Zhaoxia, CHEN Yaning, LI Weihong . Ecological Water Demand of Vegetation Based on Eco-hydrological Processes in the Lower Reaches of Tarim River[J]. Acta Geographica Sinica, 2007 , 62(5) : 451 -461 . DOI: 10.11821/xb200705001
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