1m土层NO3--N
NO3- --N contents at 1 m soil depth
饱和粉细砂土层
saturated fine silty sand ground
保护混凝土层
protective concrete layer
便携式仪器土层测气法
portable detecting soil gas method
变参数土层
soil layer with variable properties
表层土壤含水量
Surfaces soil water content
soil moisture of surface layers