STUDY ON SOIL WATER RESOURCES IN RAIN-FED AGRICULTURAL REGION OF GANSU PROVINCE

Yang Xingguo; Ke Xiaoxin; Zhang Xudong; Wan Xin

Vol.11, NO.2, 2000

Article Contents

Article Navigation > Journal of Applied Meteorological Science > 2000 > 11(2): 205-212

Yang Xingguo, Ke Xiaoxin, Zhang Xudong, et al. Study on soil water resources in rain-fed agricultural region of Gansu Province. J Appl Meteor Sci, 2000, 11(2): 205-212.

Citation:

Yang Xingguo, Ke Xiaoxin, Zhang Xudong, et al. Study on soil water resources in rain-fed agricultural region of Gansu Province. J Appl Meteor Sci, 2000, 11(2): 205-212.

Yang Xingguo, Ke Xiaoxin, Zhang Xudong, et al. Study on soil water resources in rain-fed agricultural region of Gansu Province. J Appl Meteor Sci, 2000, 11(2): 205-212.

Citation:

Yang Xingguo, Ke Xiaoxin, Zhang Xudong, et al. Study on soil water resources in rain-fed agricultural region of Gansu Province. J Appl Meteor Sci, 2000, 11(2): 205-212.

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STUDY ON SOIL WATER RESOURCES IN RAIN-FED AGRICULTURAL REGION OF GANSU PROVINCE

Lanzhou Arid Meteorological Institute, Lanzhou 730021

Received Date: 1998-11-26
Rev Recd Date: 1999-07-13
Publish Date: 2000-05-31

Abstract

Abstract

Based on the soil moisture data of eleven stations and related meteorological data in rain-fed agricultural region of Gansu province, the spatial-temporal law of soil moisture variation and the replenishment of precipitation and the conditions of soil water are analyzed. The soil moisture decreases from southeast to northwest whereas the variation coefficient increases in the region. The variation of soil moisture mainly occurs above 90 cm depth in the region where soil moisture is insufficient and 180 cm depth or so in other three regions. The regional variation of the replenishment ratio of precipitation is about 15.3%~41.7%. In addition to the impact of precipitation on replenishment ratio, the soil type is also an important restrictive factor to replenishment. The water deficit exceeds 100 mm during wheat growing season in all stations except Chengxian, Lingxia and Xifeng, and the ratio of water deficit to wheat water requirement is about 30%~50%.
- Rain-fed agriculture;
- Soil water;
- Variation coefficient;
- Replenishment ratio;
- Water deficit

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References(10)

Figures and Tables

图 1 甘肃雨养农业区土壤水分时空分布 (a) 定西 (b) 靖远 (c) 西峰 (d) 成县

(图中等值线为土壤含水量, 单位: mm)

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表 1 各站土壤类型及多年平均土壤水分状况

表 2 各站土壤水分的季节变化状况

表 3 各站3～11月降雨量以及雨季对土壤水分的补给率

表 4 小麦生育期土壤水分 (mm) 的供需状况

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