保护性耕作条件下影响蒸发量因素的试验研究

为分析保护性耕作条件下影响日棵间蒸发量的因素,在一年两熟地区保护性耕作条件下对影响蒸发的各因素进行田间试验研究,对10种保护性耕作模式的各参数与日棵间蒸发量的拟合关系进行分析。结果表明:8种耕作模式条件下日棵间蒸发量与叶面积指数、地表覆盖率有较好的三次函数关系,7种耕作模式下日棵间蒸发量与地表含水率具有较好的三次函数关系,3种耕作模式下日棵间蒸发量与地表温度具有三次函数关系。保护性耕作条件下日棵间蒸发量可近似用叶面积指数、地表覆盖率或者地表含水量计算。

Experimental study on influencing factors of evaporation under conservation tillage

Based on the conservation tillage systems for two crops a year region, the authors analyzed the influencing factors of evaporation under the conservation tillage.The fitting relations between evaporation and leaf index,as well as ground surface coverage,soil temperature,and surface soil moisture were investigated respectively.The results show that daily evaporation on the eight tillage systems has good cubic relations with the leaf index and ground coverage respectively;the evaporation on the seven tillage systems has good cubic relations with the soil surface water content;and the evaporation on the three tillage systems has good cubic relations with the surface soil temperature.So the evaporation quantity can be approximately estimated by the leaf index or surface coverage.