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作 者 ：丁玲*,李巍,施蓓,李强,逄勇,王国祥,郑磊夫

期 刊 ：生态学报 2009年 29卷 1期 页码：92~96

关键词：透明度；菹草；逻辑斯谛曲线；生长参数；生长动力学模型；

Keywords:water transparency, potamogeton crispus, logistic curve, growth parameter, dynamic growth model,

摘 要 ：在实验室研究了不同水体透明度对沉水植物菹草生长的影响，结果表明，在实验条件下，当水体透明度低于12cm时，菹草由于水下光照不足而无法存活；透明度为15cm时菹草的生物量明显低于透明度为70cm（对照）、35cm和20cm 3种情况下的生物量，表明在透明度为15cm时，菹草的生长受到了明显的抑制。实验期间，菹草生物量变化的回归分析表明，不同透明度下菹草的生长均符合逻辑斯谛曲线。采用逻辑斯谛方程描述菹草的生长规律，结合实验结果，确定不同水体透明度下菹草的生长参数，结果显示：水体透明度对菹草生长的内禀增长率rm影响较大，而对菹草生长的环境容纳量k无明显影响。综合考虑水体透明度对菹草生长的影响，建立考虑水深和透明度因素的菹草生长动力学模型，该模型可预测出在外部水环境因素作用下菹草的动态生长过程。

Abstract:The experiments of Potamogeton crispus growth under different water transparencies were conducted in lab condition. The results showed that this submerged plant cannot be survived on low water transparency when Secchi depth was less than 12cm. The growth of Potamogeton crispus was significantly inhibited under the transparency of 15cm, compared to those under the transparencies of 20cm, 35cm, and 70cm (comparison group) on biomass basis. The regression analysis confirmed that the plant′s growth patterns all fit a logistic curve. The logistic model was then applied to describe the growth regularity, estimating growth parameters under different water transparencies. The simulation indicated that the water transparency has significant effect on intrinsic rate of natural increase rm, while less effect on environmental capacity k. Based on the above results, the dynamic growth model with parameters of water depth and transparency was finally developed to predict the dynamic process of Potamogeton crispus growth under the external factors.

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