摘要
为了评价黄土高原不同土地利用方式下不同层次土壤水分特征,本研究选择黄土丘陵沟壑区石家岔流域紫花苜蓿和耕地(马铃薯)土壤为研究对象,在2017年4月至10月对20cm,50cm,100cm,150cm,200cm土层土壤含水量进行监测,分析两种土地利用方式下土壤含水量在一个完整生长季的时间动态特征和垂直剖面分布特征。结果表明:(1)土壤含水量的最高值均出现在50cm深度处,除紫花苜蓿200cm处含水量高于150cm处,其他层次表现出随着深度的增加而降低的趋势。(2)两种土地利用方式下0~100cm的土壤含水量具有明显的季节变化特征,最高值出现在降雨量最大的8月份,下层土壤含水量稳定在一个相对较低的水平,耕地的土壤贮水量要大于紫花苜蓿地。研究认为,紫花苜蓿消耗更多的土壤水分,更容易引起土壤干燥化。
In order to evaluate soil moisture characteristics at different soil depths on the loess plateau under different land use types, we selected alfalfa and arable land (potato) soil in Shijiacha watershed of the loess hilly-gully region as the research object.This research monitored soil moisture at the depth of 20cm, 50cm, 100cm, 150cm, 200cm from April to October 2017 to analyze temporal dynamic characteristics and vertical profile distribution characteristics of soil moisture content under two land use types in a complete growing season.The results showed that:(1) the highest values of soil moisture content were found at the depth of 50cm.Except that the water content of alfalfa at 200cm was higher than 150cm, other layers showed a tendency of decreasing with the increase of depth.(2) Under the two land use types, the soil moisture of 0-100cm had obvious seasonal change characteristics, the highest value occurred in August when the rainfall was the largest, the moisture of the lower soil was stable at a relatively low level, and the soil water storage of cultivated land was larger than that of alfalfa field.According to the research, alfalfa consumed more soil moisture and was more likely to cause soil desiccation.
作者
冯金超
党宏忠
丛日春
姚源
吴丽丽
FENG Jin-chao;DANG Hong-zhong;CONG Ri-chun;YAO Yuan;WU Li-li(Institute of Desertification Studies/Chinese Academy of Forestry, Beijing 100091, China;Ningxia Wolfberry Industry Development Center, Yinchuan 750001, China)
出处
《山东农业大学学报（自然科学版）》
北大核心
2019年第4期729-734,共6页
Journal of Shandong Agricultural University：Natural Science Edition
基金
中央级公益性科研院所基本科研业务费专项资金:半干旱区退耕林地降水入渗过程研究(CAFYBB2016QA021)
关键词
黄土区
土壤含水量
变异系数
土地利用方式
Loess region
soil moisture
coefficient of variation
land use type
