水资源与水工程学报

孙智妍，周秋文，罗雅雪，韦小茶，余军林.黄壤径流小区植被覆盖度对土壤湿度的影响水资源与水工程学报[J].,2019,30(4):39-46

黄壤径流小区植被覆盖度对土壤湿度的影响

Effect of vegetation coverage on soil moisture in runoff plots filling with Yellow Soil

DOI：10.11705/j.issn.1672-643X.2019.04.07

英文关键词:soil humidity vegetation coverage yellow soil runoff plot

基金项目:国家自然科学基金项目（41761003）；贵州省本科教学工程建设项目：地理与环境生态大学生创新训练中心（2016DC3）；贵州省科技支撑计划项目（黔科合支撑［2017］2855）；贵州省基础研究计划项目（黔科合基础［2017］1131）

作者	单位
孙智妍，周秋文，罗雅雪，韦小茶，余军林	（贵州师范大学地理与环境科学学院，贵州贵阳 550025）

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中文摘要:

土壤水是生态环境的重要因素，黄壤是亚热带湿润条件下的一种地带性土壤，研究植被覆盖度对土壤湿度的影响对该地区水文过程研究、水土保持、水资源利用都具有重要意义。设置植被覆盖度不同的黄壤径流小区，对其土壤湿度进行长期监测，分析不同植被覆盖度条件下土壤湿度的平均水平和变化特征，结果表明：植被覆盖度分别为75%、70%、50%、10%的条件下，土壤湿度平均值分别为43.04%、44.34%、43.33%、46.59%，土壤湿度的最大值、平均值以及变化范围、降雨时变化速度均与植被覆盖度呈负相关关系；植被覆盖度分别为75%、70%、50%、10%的条件下，各场降雨土壤湿度峰值开始时间总和分别为157、155、154、150 h，植被覆盖度较高条件下土壤湿度对降雨响应的滞后现象较为明显；9-12月，各植被覆盖度下土壤湿度均与气温呈显著正相关（P=0.05），显示出无降雨影响时段的土壤湿度呈现随季节变化降低的趋势。综上所述，在研究期内，黄壤径流小区土壤湿度的动态特征主要受降雨影响，不同植被覆盖度条件下植被对降雨的截留作用不同，是导致土壤湿度差异的主要原因。

英文摘要:

Soil water is an important element in water circulation system. Yellow soil is a kind of zonal soils forming in subtropical zone humid climate. Investigating the effect of vegetation coverage on soil water in yellow soil region is of great significance to hydrological processes research, soil and water conservation, water resources utilization. By setting runoff plots filling with yellow soil with different vegetation coverage and analyzing average value and change factor of soil moisture in these runoff plots, the results indicated that: with vegetation coverages of 75%, 70%, 50% and 10%, the average soil moisture was 43.04%, 44.34%, 43.33% and 46.59%, respectively. The maximum and average value of soil moisture, range and speed of soil moisture changes had negative relationships with vegetation coverage. With the vegetation coverage of 75%, 70%, 50% and 10%, accumulated value of time of peak soil moisture was 157 h, 155 h, 154 h and 150 h, respectively. Therefore, there was a obvious hysteretic effect of response of soil water to precipitation when vegetation coverage was large. At each vegetation coverage, soil moisture was positively correlated with temperature significantly (P=0.05), indicating that soil moisture showed downtrend from September to December. In conclusion, in the study period, dynamic characteristic of soil moisture in runoff plots filling with yellow soil was mainly effected by precipitation. The main reason of the difference of soil moisture in the condition of various vegetation coverage was the difference of precipitation interception.

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