摘要
【目的】探讨横坡垄作和顺坡垄作对不同坡位耕层土壤水分特征曲线的影响,为红壤坡耕地垄作方向的选择提供依据。【方法】采用压力膜仪法测定两种垄作方向、不同坡位(上部、中部、下部)耕层土壤水分特征曲线,并以Van Genuchten(VG)模型拟合该曲线,通过VG模型参数分析比较横坡耕作和顺坡垄作耕作后不同坡位土壤持水特点及其影响因素。【结果】红壤坡耕地耕层不同坡位土壤与0~1000 kPa水吸力对应的体积含水率为0.36~0.66 cm^(3) cm^(-3),VG模型能够较好地表达两者间数量关系。顺坡垄作上部、中部和下部坡位耕层土壤VG模型参数饱和含水率θs分别为0.59、0.59和0.65 cm^(3) cm^(-3),残余含水率θr为0.37、0.38和0.41 cm^(3) cm^(-3)且随着坡位降低而增大;横坡垄作上部、中部和下部坡位耕层土壤VG模型参数饱和含水率θs分别为0.58、0.56和0.59 cm^(3) cm^(-3),残余含水率θr为0.37、0.35和0.38 cm^(3) cm^(-3)且随坡位降低呈先减小、再增加趋势变化。VG模型参数d、n均为0.11和0.92,随耕作方向、坡位变化不明显。【结论】总孔隙度和砂粒含量为影响不同垄作方向红壤耕层理化性质的主导因素。顺坡垄作上部和中部坡位耕层土壤持水能力不及下部坡位土壤,但就同一坡位比较,横坡耕层土壤的释水能力优于顺坡耕作,说明横坡耕作可改善土壤供水能力。
[Objective]Investigating the influence of horizontal ridge and vertical ridges on water characteristics curve of different slope positions would provide a basis for choosing direction of ridge tillage of red sloping farmland.[Method]The soil moisture characteristic curve of tillage layer in different slope positions(upper,middle,and lower)of two ridge directions were measured by pressure membrane instrument and simulated by Van Genuchten(VG)model.Water retention characteristics and influencing factors of different slope positions of red soil after horizontal ridge and vertical ridge were analyzed and compared by VG model parameters.[Result]The results showed that the volume moisture contents of tillage layer of different slope positions of red soil corresponding 0 to 1000 kPa water suction were 0.36 to 0.66 cm^(3) cm^(-3),and the VG model could better express the quantitative relationship between them.The saturation moisture contents(θs)of upper,middle and lower slopes position of the VG model parameters of vertical ridge were 0.59,0.59 and 0.65 cm^(3) cm^(-3),respectively,and the residual water contents(θr)of them were 0.37,0.38 and 0.41 cm^(3) cm^(-3),respectively.They increased as the slope positions decreased.Saturation moisture contents(θs)of upper,middle and lower slopes position of the VG model parameters of horizontal ridges were 0.58,0.56 and 0.59 cm^(3) cm^(-3),respectively,and residual water contents(θr)were 0.37,0.35 and 0.38 cm^(3) cm^(-3),respectively.The trend of them decreased with the slope positions at first,then increased.VG model parameters d,n were 0.11 and 0.92.With changes of ridge direction and slope position,the changes of d and n were not obvious.[Conclusion]The results of the principal component analysis showed that total porosity and sand grain content were the leading factors affecting the physical and chemical properties of tillage layer of red soil.The water retention capacities of the upper and middle slope position of tillage layers of vertical ridge were not as good as those
作者
毛妍婷
崔荣阳
陈安强
平凤超
雷宝坤
MAO Yan-ting;CUI Rong-yang;CHEN An-qiang;PING Feng-chao;LEI Bao-kun(Agricultural Environment and Resources Institute of Yunnan Academy of Agricultural Sciences,Kunming 650205,China;Institute of Mountain Hazards and Environment,CAS,Chendu 610041,China;College of Resource and Environment,Yunnan Agricultural University,Kunming 650000,China)
出处
《土壤通报》
CAS
CSCD
北大核心
2022年第2期308-314,共7页
Chinese Journal of Soil Science
基金
云南省基金面上项目(202001AT070020)
国家自然科学基金项目(31760610,31960635)
云南省科技厅重大专项(2021-2023)
云南省财政预算重大专项(2021-2023)资助。
关键词
土壤水分特征曲线
垄作方向
坡位
红壤
Moisture characteristic curve
Ridge direction
Slope position
Red soil
