叶面积指数通常是单位面积内的叶面积与单位土地面积的比值,它的大小及其动态变化是衡量群体结构是否合理的一个重要指标。测定叶面积指数一般多采用简便的鲜重方法,其方法如下。取样在大田或试验地里,取有代表性的麦株10—20株。测量将样株的全部绿色叶片剪下称重。记下10株绿叶鲜重(c);然后迅速将全部绿叶按其大、小、 Leaf area index is usually the ratio of leaf area to unit land area per unit area. Its size and its dynamic change are important indexes to measure whether the community structure is reasonable. Determination of leaf area index generally use simple fresh weight method, the method is as follows. Sampling In the field or experimental site, take 10-20 representative wheat strains. Measurements All green leaves of the sample were cut and weighed. Make a note of the fresh weight of 10 green leaves (c); then quickly divide all the green leaves by their large, small,