Temporal and Spatial Variation and Influencing Factors of Soil Moisture in

HAN Xinsheng; WANG Yanhui; YU Pengtao; XIONG Wei; LI Zhenhua; CAI Jinjun; XU Hao

doi:10.13870/j.cnki.stbcxb.2019.01.019

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Temporal and Spatial Variation and Influencing Factors of Soil Moisture in

更新时间：2025-03-12

- Temporal and Spatial Variation and Influencing Factors of Soil Moisture in
- Vol. 33, Issue 1, Pages: 111-117(2019)
- 作者机构：
  
  1. 宁夏农林科学院荒漠化治理研究所, 宁夏防沙治沙与水土保持重点实验室,银川,750002
  2. 中国林业科学研究院森林生态环境与保护研究所, 国家林业和草原局森林生态环境重点实验室,北京,100091
  3. 新乡学院生命科学技术学院,河南,新乡,453000
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2019.01.019
  CLC： S152.7
- Published：2019
- 稿件说明：
移动端阅览
HAN Xinsheng, WANG Yanhui, YU Pengtao, et al. Temporal and Spatial Variation and Influencing Factors of Soil Moisture in[J]. 2019, 33(1): 111-117.
DOI：

HAN Xinsheng, WANG Yanhui, YU Pengtao, et al. Temporal and Spatial Variation and Influencing Factors of Soil Moisture in[J]. 2019, 33(1): 111-117. DOI： 10.13870/j.cnki.stbcxb.2019.01.019.

摘要

分析森林土壤湿度时空变异规律，研究植被蒸腾、林地蒸散和气象因子对土壤湿度的影响，对干旱地区的植被恢复、林水协调管理和植被生态水文功能提升都有重要意义。在宁夏六盘山北侧半干旱的叠叠沟小流域，建立了华北落叶松人工林标准样地，利用气象站、热扩散探针、微型蒸渗仪、时域反射仪等设备，同步监测了2013年7-10月的气象条件、林木蒸腾、林地蒸散、土壤湿度的动态变化，并分层（0-20，20-40，40-60，60-80 cm）探讨了土壤湿度的主要影响因子。结果表明：（1）受随机降雨事件影响，土壤湿度呈现相应的脉冲性变化；整体而言，表层（0-20 cm）土壤湿度（32.69%）较低，以下各层较高（40.00%左右）；土壤湿度的变异程度随土层加深和降雨增大而逐渐减弱。（2）影响土壤湿度的主要气象因子为温度、饱和水汽压差和气压；林木蒸腾和林地蒸散与整个研究期间主根系层（0-60 cm）土壤湿度的相关性显著。（3）土壤湿度与各因子的相关系数随土层加深而变小，在主根系层明显，在以下土层（60-80 cm）不明显。综上可知，森林土壤湿度同时受降水输入和蒸散输出影响，各土层湿度的时间变化规律相似；但表层土壤的湿度低、变幅大，土壤湿度对影响因子的响应敏感性和变幅随土层加深而逐步缩小。

Abstract

Understanding the temporal and spatial variation of soil moisture of forest and studying the effects of vegetation transpiration

forest floor evapotranspiration and meteorological factors on soil moisture are important to vegetation restoration

integrated forest-water management and the improvement of the eco-hydrological functions of forest/vegetation in the arid regions. A stand plot of Larix principis-rupprechtii plantation was established in the semiarid Diediegou small watershed on the north side of Liupan Mountains

Ningxia. Meteorological conditions

forest transpiration

forest floor evapotranspiration and soil moisture during July to October in 2013 were simultaneously monitored by automatic meteorological station

thermal diffusion probes

micro-lysimeters and time domain reflectometry. The soil moisture was monitored in the layers of 0-20

20-40

40-60 and 60-80 cm

to explored the main factors affecting the soil moisture. The results showed that:(1) Affected by the random rainfall events

the soil moisture showed corresponding pulse variation. On the whole

the mean soil moisture (32.69%) of the surface layer (0-20 cm) was relatively lower than that of the layers followed (about 40.00%). The variation range of soil moisture decreased gradually with the increasing of soil depth and rainfall amount. (2) The main meteorological factors influencing soil moisture were temperature

saturation vapor pressure deficit and atmospheric pressure. The forest transpiration and forest floor evapotranspiration had a significant correlation with the soil moisture of the main root zone (0-60 cm) during the whole study period. (3) The correlation coefficients between soil moisture and all the influencing factors decreased with the increasing of soil depth

which were significant in the main root zone

but no longer significant in the soil layers below (60-80 cm). In summary

the forest soil moisture was affected by both the precipitation input and evapotranspiration output. The temporal variation of soil moisture in each soil layer was similar. However

the soil moisture of surface layer was low and with a larger variation range. The sensitivity and amplitude of soil moisture to the influencing factors decreased gradually with the increasing of soil depth.

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