森林与环境学报2024，Vol.44Issue(4)：357-366,10.DOI:10.13324/j.cnki.jfcf.2024.04.003
华北落叶松林不同坡位土壤含水量对降雨的响应
Response of soil moisture content to rainfall at different slope positions in Larix gmelinii var. principis-rupprechtii plantation
摘要
Abstract
To clarify the differences soil moisture content in response to rainfall at diverse slopes of forested hillslope,a typical hillslope covered by Larix gmelinii var. principis-rupprechtii plantation in the semi-humid zone of Liupan Mountain was selected for this study. Meteorological factors such as rainfall and variations in soil moisture content in the rhizosphere at 0-60 cm and different slope positions(upper,middle,and lower slopes) were observed continuously from May to October of 2022,and the response of soil moisture content to varied rainfall events and their slope position differences within the growing season were analyzed. Our results showed differences in soil moisture content among slope positions,with the mean values showing a upper>middle>lower slope pattern,with the fluctuations in soil moisture content being the greatest in the middle slope. Moreover,rainfall recharge of soil moisture content varied by slope,with the recharge thresholds being lowest(1.9 mm) in the middle slope and highest(2.3 mm) in the lower slope. Slope differences were also observed in the response of soil moisture content to rainfall at various rhizosphere levels. The response duration of soil moisture content in the 0-20 cm soil layer was the shortest for all slopes under light rainfall conditions. However,the duration of soil moisture content response was shorter in the 40-60 cm soil layer than in the 20-40 cm soil layer at the top and middle of the slope under moderate and heavy rainfall events. These observations indicated that there might be a preferential flow of water in the soil at the middle and upper slopes. The results of this study are important for understanding soil moisture movement and its redistribution on slopes.关键词
华北落叶松林/土壤含水量/坡位差异/降雨响应Key words
Larix gmelinii var. principis-rupprechtii plantation/soil moisture content/slope difference/response to rainfall分类
农业科技引用本文复制引用
王梦飞,刘泽彬,于松平,徐丽宏,郭建斌..华北落叶松林不同坡位土壤含水量对降雨的响应[J].森林与环境学报,2024,44(4):357-366,10.基金项目
"十四五"国家重点研发计划课题"土石山区华北落叶松林水源涵养及固碳功能提升技术"(2022YFF1300404) （2022YFF1300404）
中央级公益性科研院所基本科研业务费专项资金项目"森林坡面产流的时空变化及影响机制"(CAFYBB2020QB004) （CAFYBB2020QB004）
国家自然科学基金项目"黄土高原地区生物物理因素驱动下树干储水的抗旱机制及模拟"(32271959). （32271959）
