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| Study on Annual Variation of Soil Moisture in Different Positions of Topography |
| Zhu Delan,Wu Faqi |
| College of Resources and Environment, Northwest Sci-tech University of Agriculture and Forestry, 712100, Yangling, Shaanxi, China |
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Abstract By measuring soil moisture in depth 0 - 180 cm on shaded hillside, sunny hillside, semi - shaded hillside and plain land in Feimahe valley, the about time, space of soil moisture and shortage degrees of various site was analyzed . The result indicated that the distribution of soil moisture varied from terrace widthes. The soil moisture of narrow terrace was well distributed in depth 0 - 180 cm, but that of the wide terrace was decreased from inside to outside. It was different from aspect of slope and seat of slop. The soil moisture of shaded hillside was 111.9 mm more than that on sunny hillside in the annual average value. The soil moisture along slope was well distributed after constructing horizontal stage. The variation of soil moisture in a year could be divided into three stages, namely very slow variation stage from the beginning of December to the end of June of next year, very fast variation stage from the beginning of July to the end of August and slow variation stage from September to the end of October. The variation of shaded hillside was slower than sunny hillside. On the other hand, difference of satisfied degrees of soil moisture on plant was very large in various standing conditions. Secondary forestry on middle and lower part of shaded hillside was not lack of water basically but upper part was lack of water. The corn and fruit tree were deficient in water since the May and the satisfied degrees were 74.4% and 83% respectively from April to October.
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Received: 08 September 2003
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