中文摘要：

为了研究温室作物生物量积累的变化过程，本文构建了一类二阶差分模型，该模型具有有界性、单调性与全局渐近稳定性．对实验数据的模拟表明，该模型能很好解释温室黄瓜生物量轨迹运动趋势与干重积累率增长特性，比原有的生长模型拟合效果好．

英文摘要：

Abstract： In order to explain the dynamic trend of greenhouse crop biomass accumulat- ing rate, this paper established a class of second-order difference model with the expression of which has the characteristics of boundedness, monotony and global asymp- totic stability. The simulating results by data of greenhouse cucumber dry weight accumulating rate showed that this model can better explain the trajectory trend of biomass of greenhouse cucumber and the characteristic of its dry weight accumulating rate than logistic model, and its fitting effect was better, too.