不同降水状态下土壤水分的变化特征分析  

Analysis of Variation Characteristics of Soil Moisture under Different Rainfall Conditions

作　　者：杨军 薄万福 邓元博 YANG Jun(Changbai Mountain chibei District Meteorological Bureau,Antu,Jilin 133613)

机构地区：[1]长白山池北区气象局,吉林安图133613 [2]长白山气象与气候变化吉林省重点实验室,吉林长春133062

出　　处：《农业灾害研究》2021年第10期77-78,80,共3页Journal of Agricultural Catastrophology

摘　　要：为了研究长白山北坡地区土壤墒情变化特征,利用二道站自动土壤水分仪所采集的土壤相对湿度数据,取用2019—2020年10 cm、20 cm、30 cm、40 cm共4个层次土壤的相关资料,对不同量级降水后6 h、12、24 h和48 h土壤相对湿度的变化进行分析。结果表明:(1)出现不同量级降水对10 cm深度土壤均影响最大;(2)10 mm量级的降水仅对10 cm深度土壤湿度影响较大;出现20 mm降水后,10~40 cm土壤均受到影响,10 cm土壤变化幅度最大,40 cm土壤需12 h后土壤湿度受影响;(3)土壤饱和状态下,10 cm土壤下降10%需要38 h,40 cm土壤由90%到80%则需要经过168 h;(4)连续性降水出现24 h后,各土层湿度趋于稳定。In order to study the variation characteristics of soil moisture in the Northern Slope of Changbai Mountain, the relative soil moisture data collected by the automatic soil moisture meter at the second station were used in this study. The soil moisture data were collected at four levels of 10 cm, 20 cm, 30 cm and 40 cm in 2019—2020. The changes of soil relative moisture at 6 h, 12 h, 24 h and 48 h after precipitation of different magnitude were analyzed. The results showed that :(1)precipitation of different magnitude had the greatest influence on soil at 10 cm depth;(2)10 mm precipitation only had a significant effect on soil moisture at 10 cm depth. After 20 mm precipitation, soil moisture at 10~40 cm was affected, with the greatest variation at 10 cm. After 12 hours at 40 cm, soil moisture was affected.(3) Under soil saturation, it takes 38 h for 10 cm to decrease by 10%,and 168 h for 40 cm to decrease by 90% to 80%;(4) After the continuous precipitation appeared for 24 h, the humidity of each layer tended to be stable.

关 键 词：土壤湿度 降水量级 变化 

分 类 号：S152.7[农业科学—土壤学]