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| Characteristics of Soil Moisture in the Area Growing Haloxylon ammodendron in the Minqin Desert-Oasis Ectone |
| Zhang Xiaoyan1, Chu Jianmin1, Meng Ping1, Zhang Tianyi2, Gao Mingyuan1, Li Delu3 |
1. Key Laboratory of Tree Breeding and Cultivation of State Forestry Administration, Research Institute of Forestry, Chinese Academy of Forestry, Beijing 100091, China;
2. LAPC, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100049, China;
3. MinQin National Studies Station for Desert Steppe Ecosystem, Gansu Desert Control Research Institute, Wuwei 733000, Gansu, China |
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Abstract The temporal and spatial variation of soil moisture (VSM)was analyzed with the method of the time domain reflectometer (TDR) in an area dominated by Haloxylon ammodendron in the Minqin Desert-Oasis Ectone. The results showed that: From August to October, the range of soil volumetric moisture around roots in sunny days were larger than that in cloudy days. The higher soil water change areas were in the 20-cm or 150-cm level points in August and October. In vertical level, the areas of higher soil water change mainly distributed in shallow soil layer in August, while in deep soil layer in October. The month of VSW higher changes was October only in the area without roots. The soil moisture in different points existed a vital difference in the three months. There were differences in the time points of soil moisture change. When snowing, the rich water phenomenon was showed in the 20-cm level point, but the VSW of the 150-cm and 250-cm level points were the lowest because of the canopy interception and evaporation. The trends of VSW showed vitally difference in level and vertical gradient aspects respectively. For instance, the site of the lowest VSW was 20 cm in August, while the VSW gradually increased with a shorter distance to the stems in September and October. Totally, the VSW in root area was lower than area without root. In the root zone, average daily VSW was affected by environment factors in an order: air temperature>humidity of the air>rainfall>net radiation>photosynthetic radiation.
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Received: 29 December 2014
Published: 20 September 2015
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2015, Vol. 35 
