Effects of Different Slope Conditions on Soil Moisture of Amygdalus Pedunculate Woodland in Mu Us Sandy Land

Zhao Xin; Zhai Sheng; Li Jianbao; Sun Shuchen

doi:10.13961/j.cnki.stbctb.2020.04.007

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Effects of Different Slope Conditions on Soil Moisture of Amygdalus Pedunculate Woodland in Mu Us Sandy Land

- Effects of Different Slope Conditions on Soil Moisture of Amygdalus Pedunculate Woodland in Mu Us Sandy Land
- Bulletin of Soiland Water Conservation Vol. 40, Issue 4, Pages: 45-52(2020)
- 作者机构：
  
  1. 聊城大学环境与规划学院,山东,聊城,252059
  2. 南京财经大学公共管理学院,江苏,南京,210023
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2020.04.007
  CLC： S152.7;S157.2
- Published：2020
- 稿件说明：
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Zhao Xin, Zhai Sheng, Li Jianbao, et al. Effects of Different Slope Conditions on Soil Moisture of Amygdalus Pedunculate Woodland in Mu Us Sandy Land[J]. Bulletin of Soiland Water Conservation, 2020, 40(4): 45-52.
DOI：

Zhao Xin, Zhai Sheng, Li Jianbao, et al. Effects of Different Slope Conditions on Soil Moisture of Amygdalus Pedunculate Woodland in Mu Us Sandy Land[J]. Bulletin of Soiland Water Conservation, 2020, 40(4): 45-52. DOI： 10.13961/j.cnki.stbctb.2020.04.007.

摘要

[目的] 揭示半干旱区固定沙丘不同坡位条件下土壤水分空间变化规律，为固定沙丘土壤水分合理利用提供决策依据。[方法] 在毛乌素沙漠东南缘陕西省神木市生态协会毛乌素治沙造林基地，以固定沙丘12 a龄人工长柄扁桃林地为研究对象，建立土壤水分定位观测小区，使用CNC503DR型中子仪对2018年7—10月0—300 cm土层土壤水分进行测定，并分析不同坡位条件下长柄扁桃林地生长季土壤水分时空变化特征。[结果] ①坡顶与坡上0—300 cm土壤剖面含水量随土层深度的增加呈先增加后减小，之后趋于稳定的变化趋势，而坡中（上、下）与坡底表现为类似S形的变化规律，土壤含水量表现为：坡底 > 坡中（上） > 坡上≥坡顶 > 坡中（下）；②坡底土壤含水量表现出强变异性，其他4种坡位条件下为中等变异；③不同坡位条件下蒸散发表现为：坡底 > 坡顶 > 坡中（下） > 坡上 > 坡中（上），坡上属强变异，而坡底则表现出中等变异且变异系数最小。[结论] 不同坡位条件对固定沙丘土壤水分及蒸散耗水具有重要影响，坡底土壤含水量及蒸散发量均最大，且具有较强的不稳定性。

Abstract

[Objective] The spatial variation of soil moisture under different slope conditions in fixed sand dunes in semi-arid area was studied in order to provide decision-making basis for the optimal management of soil moisture in fixed sand dunes. [Methods] In the Mu Us sand land controlled and afforestation base of Shenmu ecological association of Shanxi Province in the southeastern edge of Mu Us sand land

the 12-year-old artificial Amygdalus pedunculate woodland in fixed dunes was taken as the research object. Soil moisture observation plots were established and CNC503DR neutron meter was used to measure soil moisture in 0—300 cm soil layer from July to October in 2018. The spatial and temporal variation characteristics of soil moisture during the growing season of Amygdalus pedunculate were analyzed under different slope conditions. [Results] ① Soil moisture content of the 0—300 cm soil profile at the top and upper slope increased firstly and then decreased with the increase of soil depths

and then tended to be stable. However

the soil moisture variation of the middle (upper and lower) of the slope and the bottom of the slope showed a S-shape pattern. Soil water content and storage showed as:slope bottom > middle slope (upper) > the upper slope ≥ slope top > middle slope (lower). ② The soil moisture content at the lower slope showed strong variability

while the other four slope conditions showed moderate variation. ③ Thevariation of evapotranspiration (ET) was as follows: bottom of slope > top of slope > middle of slope (lower) > upper of slope > middle of slope (upper). The variation of ET on slope bottom was medium and the coefficient of variation was the smallest. [Conclusion] Different slope conditions had important effects on fixed dune soil moisture and ET. Soil moisture content and ET at the bottom of slope was the highest and showed a strong instability.

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