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作物的密度敏感性反映了稳产性,是广义作物耐密性的重要组成部分.密度敏感性可以用敏感度表示,它是当密度偏离最适值1株/m^2时,产量-密度的单峰曲线上两条切线的到角,取值0°~180°,据此将密度敏感性划分为5个等级.密度敏感度的上界是最适单株产量的严格增函数.对中国上世纪60年代以来155个玉米密度试验产量结果作密度敏感性分析,发现密度敏感度接近对数正态分布,中位数为49°,极不敏感和不敏感两个等级占总数的68.4%.密度敏感度揭示了密度与稳产性的关系,在玉米及其它作物研究中具有重要应用价值.
Density sensitivity of crops reflects the stability of production, which is an important part of the generalized crop tolerance. Density sensitivity can be expressed in terms of sensitivity, which is a measure of yield-density when the density deviates from the optimum value of 1 plant / m ^ 2 The angle of the two tangent lines on the peak curve is from 0 ° to 180 °, and the density sensitivity is divided into five levels.The upper bound of density sensitivity is a strictly increasing function of the optimum plant yield. Density-sensitivity analyzes of 155 corn density test results since the 1960s found that the density sensitivity was close to a log-normal distribution with a median of 49 ° and a very insensitive and insensitive 68.4% of the total. Density sensitivity reveals the relationship between density and yield stability and has important applications in the study of corn and other crops.