土壤──植物系统中水流阻力的变性  

VARIABILITY OF HYDRAULIC RESISTANCE IN SOIL-PLANT SYSTEM

作　　者：黄明斌[1] 邵明安[1] 

机构地区：[1]中国科学院西北水土保持所,水利部西北水土保持所

出　　处：《土壤学报》1996年第2期211-216,共6页Acta Pedologica Sinica

摘　　要：本文依据生长箱内模拟试验资料，借助于瞬态流方程，从蒸腾速度的日变化和长期变化两个方面，分析了冬小麦和玉米水流阻力的变性。最后指出冬小麦和玉米的水流阻力随蒸腾速率的增大而减小，呈指数函数关系，且当蒸腾速率增大到某一定值时，水流阻力为一常数。同时，本文还讨论了有效水势对水流阻力的影响。Based on the simulated experiment data of winter wheat and corn in growth boxes, the variability of hydraulic resistance in the soil-plant system was analysed from aspects of diurnal changes and long-term changes of transpiration rates in this paper. The results indicated that hydraulic resistances in the plant were relatively large at low transpiration rates,decreased as transpiration rates increased and approached a constant value at higher transpiration rates. The effect of effective soil water potantial on hydraulic resistances was also studied.

关 键 词：水流阻力 蒸腾速率 变性 土壤-植物系统 

分 类 号：S154.4[农业科学—土壤学]