不同种植方式土地利用效率的定量评价

 【目的】针对目前土地当量比在间作应用中存在的问题，分析土地当量比概念的实质是评价不同种植方式的土地利用效率。【方法】采用理论分析与田间试验结果相结合的方法。【结果】在研究土地当量比内涵的基础上，结合实例进一步就应用土地当量比评价复种套作、间混作及轮作等不同种植方式的土地利用效率进行了深入探讨，明确了土地当量比是评价不同种植方式土地利用效率的客观指标。【结论】复种套作、间混作及轮作的土地当量比分别为1.68、1.38和1.21，三种不同的种植方式土地利用效率较单作分别提高68％、38％和21％。

Quantitative Evaluation of Land Use Efficiency Under Different Cropping Patterns

Objective] To counter the problems existed in application of land equivalent ratio in intercropping, the paper has analyzed that the essence of land equivalent ratio is to estimate land use efficiency of various cropping patterns. Method] The method of theoretical analysis combining with experimental data was used. Result] On the basis of revealing the essence of land equivalent ratio, combined with living examples, the method of estimating land use efficiency of various cropping patterns, such as sequential cropping, intercropping, and crop rotation was studied. It is cleared that land equivalent ratio is an objective index of estimating land use efficiency of various cropping patterns. Conclusion] It was found that the land equivalent ratio of sequential cropping, intercropping, and crop rotation is 1.68, 1.38 and 1.21. Compared with single cropping, the land use efficiency under different cropping patterns is increased by 68%, 38% and 21%, respectively.