土地当量比计算方法的改进与应用

土地当是比是评价植制度效果的重要指标，本文在综合分析了间混作群体土地当量比计算方法的基础上，界定了土地当量比的内涵，对土地当量比在不同作物群体中的计算方法进行了改进，使之可以评价任何作物群体的生产效果，同时对不同作物群体土地当量比的计算方法进行了实证分析，拓宽了其应用范围，为定量评价不同种植方式的生产效果提供理论依据和实用方法。

Improvement and Application of Calculating Method of Land Equivalent Ratio

Land equivalent ratio(LER) is an important concept of appreciating farming system. On the basis of analyzing on calculating method of land equivalent ratio in inter - cropping, this paper proposes the intension of land equivalent ration and improves its calculating method in different crop colony. Land equivalent ratio is applied in appreciating productive efforts of every fundamental crop colony,the calculating methed of land equivalent ratio is analyzed in different croP colOny, its range of application in farming system is expanded. The paper suffers theoretical foundation and practical method for appreciatillg different farming systems.