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依据田间实测资料，运用水流的电模拟原理，定且分析了南亚热带丘陵赤红壤-果树（荔枝、芒果和龙眼）-大气连续体中水流阻力各分量的大小、变化规律及其相对重要性．结果表明，连续体中的水流阻力主要分布于从叶气孔腔到大气的扩散过程，荔枝、芒果、龙眼叶-气系统的水流阻力Rla占连续体水流总阻力Rsa的比例分别为93.65％～98.03、95.68％～99.03％、90.13％～98.71％；果树植株体的水流阻力Rp居其次，占Rsa的比例分别为1．97％～6．35％、0.97％～4.32％、0．08％～9．87％：土壤阻力Rs最小，占Rsa的比例小到可忽略不计，故叶-气系统的水流阻力是决定连缤体中水流速率的重要因素．
Based on the field data and the electric simulation principle of water flow, the size, variation and relative importance of the components of water flow resistance in the red loam - fruit trees (litchi, mango and longan) - atmospheric continuum in the southern subtropical horizons were analyzed and determined. The results show that the flow resistance in the continuum is mainly distributed in the diffusion process from the leaf cavity to the atmosphere. The ratio of the flow resistance Rla of the litchi, mango and longan leaf-gas systems to the total flow resistance of continuous flow is 93.65% -98.03 , 95.68% -99.03% and 90.13% -98.71% respectively. The flow resistance Rp of fruit trees was second highest, the proportion of Rsa accounted for 1.97% ~ 6.35%, 0.97% ~ 4.32%, 0.08% ~ 9.87%: The soil resistance Rs is the smallest, and the proportion of Rsa is as small as negligible. Therefore, the flow resistance of the leaf-gas system is an important factor that determines the water flow rate in the plant.