摘要
第四纪红粘土地区的土壤水分是制约生产的主要因素之一。径流观测小区和定点土壤水分观测表明:在水土流失严重地区,土壤年流失量在6000t/km^2以上,径流系数为0.3～0.35,土壤有效水容量约为5%,在降透雨后土壤耐旱期0～20cm 土层仅为7天,20～40cm 约为14天。夏季降透雨多为15天以上1次。侵蚀土壤经生物改良或有机肥改土后,使 A 层得以恢复,土壤有效水含量可提高到200g/kg,有效水容积将比原来增加2.1倍。通过对侵蚀土壤的不同土层在夏季的水分变化分析,得到了土壤水分变化模型。
The moisture in quaternary red clay is one of factors restricted farming productivity. The loss determination of water and soil on runoff plots and test of soil moisture on the field showed that annual soil loss in serious erosion area is over 6 000t/km^2;the runoff coefficient is 0.3～0.35;available water content of soil is about.5%;the period of drought resistance after full- raining in 0～20cm soil layer is only 7 days,in 20～40cm about 14 days.It is a few of raining time in summer with once a fifteen days.After improvement with biological measures or using manure, restoring soil,A horizon the soil available moisture could be raised to 200g/kg,an increase with 2.1 fold in volume.The model described the change of soil moistrure have been got by analysis to the change of moisture in different soil layers in summer.
出处
《水土保持学报》
CSCD
北大核心
1993年第2期45-50,共6页
Journal of Soil and Water Conservation
关键词
红粘土
土壤侵蚀
土壤含水量
eroded sterile soil
soil moisture regime
model of soil moisture change
