刺槐,人工林,土壤水分,水文物理性质,坡位,动态变化,甘肃 ," /> 刺槐,人工林,土壤水分,水文物理性质,坡位,动态变化,甘肃 ,"/> <p class="MsoNormal" align="center" style="text-align:left;"> <b>Soil Moisture Content under Artificial <i>Robinnia pseudoacacia </i>Forest at Different Slope Positions in the Zhonggou Minor Basin, Jingchuan County, Gansu Province</b><i></i>

Arid Zone Research ›› 2019, Vol. 36 ›› Issue (5): 1300-1308.doi: 10.13866/j.azr.2019.05.28

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Soil Moisture Content under Artificial Robinnia pseudoacacia Forest at Different Slope Positions in the Zhonggou Minor Basin, Jingchuan County, Gansu Province

ZHANG Xiao-mei1, DI Li1, SHI Zai-jun2, FEI Jun-e1, WANG Zheng-an3   

  1. 1.College of Resources and Environmental Sciences, Gansu Agricultural University, Lanzhou 730070,Gansu,China;

    2. Guanshan Forest Farm in Jingchuan County, Pingliang 744306,Gansu,China;

    3.Guyuan Branch of Ningxia Academy of Agriculture and Forestry, Guyuan 756000, Ningxia,China

  • Received:2019-12-20 Revised:2019-03-04 Online:2019-09-15 Published:2019-09-11

Abstract:

The soil hydrophysical properties under the artificial Robinia pseudoacacia forests in different landforms in a minor drainage basin in Jingchuan County, Gansu Province were measured using the “ring knife” method, and the soil moisture content was also measured using the oven drying method. The soil bulk density in 0-100 cm soil layer under the R. pseudoacacia plantations at different slope positions was in an order of the R. pseudoacacia forest on the hill top (1.24 g·cm3) > R. pseudoacacia forest at the gully bottom (1.20 g·cm3) > R. pseudoacacia forest (1.18 g·cm3) > R. pseudoacacia forest on the hill slope (1.16 g·cm3). The total soil porosity was in an order of the R. pseudoacacia forest on the hill slope (51.99%) > R. pseudoacacia forest in the gully (51.31%) > R. pseudoacacia forest at the tableland bottom (50.52%) > R. pseudoacacia forest at the tableland top (49.33%). The saturation moisture capacity and non-capillary moisture capacity of soil under the R. pseudoacacia forest on the hill slope were both the highest, then those under the R. pseudoacacia forests in gully and at the tableland bottom, and they were the lowest under the R. pseudoacacia forest on the hill top. The seasonal variation of soil moisture content under the forest was obvious, which could be divided into the soil moisture consumption period (from May to June), soil moisture supply period (July) and soil moisture reduction period (from August to September). The variable coefficient of soil moisture content under the forests in different landforms was increased at first and then decreased with the increase of soil depth, and it reached the highest value (Cv>0.3) in 40-80 cm soil layer. The results revealed that the soil moisture content was the highest under the R. pseudoacacia forest on the hill top, and then under the forests at the gully bottom and the on the gully tableland, and it was the lowest on the hill slope.

Key words: Robinia pseudoacacia, plantation, soil moisture content, hydrophysical property, slope; dynamic change, Gansu Province