基于冠气温差的作物水分胁迫指数经验模型研究进展

Advances in Crop Water Stress Index Empirical Model Research Based on Canopy and Atmosphere Temperature Difference

以作物冠层和空气温度的差值为基础,构建指标监测农田作物水分状况,在过去40 a间取得了很大的进步。在简要论述了以冠气温差为基础的3个指标(胁迫积温、作物水分胁迫指数经验模型和理论模型)发展历程后,着重介绍了作物水分胁迫指数(CWSI)经验模型在计算及应用中存在的主要问题。分析认为CWSI经验模型在目前的使用中存在基线计算方法不统一、基线建立所受环境因素过多、不同地区推广存在区域适用性以及CWSI经验模型应用具有单一性等问题。CWSI经验模型计算简便,如何针对存在的问题进行必要的改进,对该指标的标准化和推广具有重要的应用价值。

Based on canopy-atmosphere temperature difference,some indexes for monitoring crop water status were constructed and those techniques had been developed quickly since the 1970s.This paper mainly discussed the problems for calculation and application of CWSI（Crop water stress index）empirical model.There are four main problems for usage of CWSI empirical model.Firstly,the method of CWSI calculation is not unified for different researchers.Secondly,the formulation of CWSI baselines is affected by many factors.Thirdly,CWSI can be used only in some specific regions.Finally,in different regions there are different baselines.For giving a great usage of CWSI,we have to work out those problems in future research.