根土界面的行为及小麦品种对其的影响

Water movement into and out of roots depends on the water potential difference between the bulk soil and the root xylem and the total hydraulic conductance of the pathway,which can be divided into three parts, i.e.soil conductance,soil-root conductance and root conductance .The values and relative importance vary with soil water content .The general rule is that water uptake by roots is mainly limited by radial hydraulic conductance of root in wet soils, the soil-root interface becomes a major limiting factor water uptake in moderately dry soils,and the water uptake is limited by the rapidly decreasing soil hydraulic conductance in seriously dry soils .Meanwhile these limiting factors vary with crop variety,and these variations can be used to evaluate the drought-resistance and water use efficiency of crops.

Behaviours of soil-root interface and their variations with wheat varieties

Water movement into and out of roots depends on the water potential difference between the bulk soil and the root xylem and the total hydraulic conductance of the pathway,which can be divided into three parts, i.e.soil conductance,soil-root conductance and root conductance .The values and relative importance vary with soil water content .The general rule is that water uptake by roots is mainly limited by radial hydraulic conductance of root in wet soils, the soil-root interface becomes a major limiting factor water uptake in moderately dry soils,and the water uptake is limited by the rapidly decreasing soil hydraulic conductance in seriously dry soils .Meanwhile these limiting factors vary with crop variety,and these variations can be used to evaluate the drought-resistance and water use efficiency of crops.