文章摘要
耿林昇, 李红丽, 董智, 郭建英, 陈新闯.放牧对希拉穆仁草原土壤入渗过程影响的定量评估[J].水土保持学报,2022,36(2):70~77
放牧对希拉穆仁草原土壤入渗过程影响的定量评估
Quantitative Evaluation of the Effects of Grazing on Soil Infiltration Process in Xilamuren Grassland
投稿时间:2021-09-28  
DOI:10.13870/j.cnki.stbcxb.2022.02.009
中文关键词: 放牧强度  土壤入渗  入渗速率  土壤累积入渗  希拉穆仁草原
英文关键词: grazing intensity  soil infiltration  infiltration rate  soil cumulative infiltration  Xilamuren grassland
基金项目:国家自然科学基金项目(51879155,31870708)
作者单位E-mail
耿林昇1, 李红丽1, 董智1, 郭建英2, 陈新闯1 1. 山东农业大学林学院, 泰山森林生态系统定位研究站, 山东 泰安 271018

2. 水利部牧区水利科学研究所
, 呼和浩特 010020 
nmgdz@163.com 
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中文摘要:
      为定量评估放牧对草原土壤入渗的影响,了解和防治放牧造成的水土流失,科学评估草原水文调节功能,采用双环入渗法研究了放牧对典型草原土壤入渗性能的影响,并收集影响土壤入渗的环境特征变量。结果表明:(1)土壤入渗能力均受到放牧活动的干扰,随着放牧强度的增加,土壤初渗速率、稳渗速率减小, 达到稳渗时的历时缩短,而轻度放牧对土壤入渗性能却具有增强作用,LG的初渗速率(5.12 mm/min)、稳渗速率(1.93 mm/min)、2 h累积入渗量(213.42 mm)均较好, 快速入渗至稳渗阶段历时延长。(2)不同放牧强度下,放牧强度与土壤初渗速率、稳渗速率、累积入渗量呈显著负相关关系,相关系数分别为-0.646,-0.770,-0.531。植被盖度、砂粒体积百分数、孔隙度均与土壤入渗速率呈正相关关系,而土壤容重则相反。土壤容重、总孔隙度、毛管孔隙度对土壤入渗速率的影响最为显著。适度放牧(LG,1.5羊/(hm2·月))会改善土壤特征参数及植被生长情况,提高土壤的入渗性能。(3)通过土壤入渗模型分析,Horton模型对土壤入渗速率及土壤累积入渗的拟合效果均表现为最好。研究结果可为放牧条件下典型草原的土壤入渗及水文调节功能的定量评估提供参考。
英文摘要:
      In order to quantitatively evaluate the impact of grazing on the process of grassland soil infiltration, understand and prevent soil erosion by grazing and scientifically evaluate the hydrological regulation function of grassland, this study took Xilamuren grassland as the main research object and used the double-loop infiltration method to study the effects of grazing on soil infiltration performance of typical grassland and collected the environmental characteristic variables affecting soil infiltration. The results showed that:(1) The soil infiltration capacity was disturbed by grazing activities. With the increasing of grazing intensity, the initial soil infiltration rate and steady infiltration rate decreased, and the time to reach steady infiltration shortened. However, light grazing (LG) enhanced the infiltration performance of the soil. The initial infiltration rate (5.12 mm/min), steady infiltration rate (1.93 mm/min) and cumulative infiltration capacity (213.42 mm) for 2 hours were all good under the LG condition. The duration from the rapid infiltration stage to the stable infiltration stage of LG was prolonged. (2) Under different grazing intensities, there was a significant negative correlation between grazing intensity and soil initial infiltration rate, steady infiltration rate and cumulative infiltration amount, and the correlation coefficients were -0.646, -0.770 and -0.531, respectively. Vegetation coverage, sand volume percentage and porosity were all positively related to soil infiltration rate, while soil bulk density was the opposite. Soil bulk density, total porosity and capillary porosity had the most significant effect on soil infiltration rate. Appropriate grazing (LG, 1.5 sheep/(hm2·month)) improved soil characteristic parameters and vegetation growth, and increased soil infiltration performance. (3) Through the analysis of soil infiltration model, the Horton model had the best fitting effect on soil infiltration rate and soil cumulative infiltration. This study could provide a reference for the quantitative evaluation of soil infiltration and hydrological regulation function of typical grassland under grazing conditions.
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