光照、温度和氮对竹叶眼子菜生长的影响

Effects of light,temperature and nitrogen on the growth of Potamogeton malatanus Mig

实验选择长江中下游常见沉水植物竹叶眼子菜（Potamogeton malaianus Mig．），利用正交试验设计，通过室内静态模拟实验研究3种主要环境因子光照强度、温度、总氮浓度及其互作对竹叶眼子菜分苗生长的影响。结果表明：光照强度和温度为影响竹叶眼子菜生长的主效环境因子，且它们的交互作用对竹叶眼子菜生长有较为显著的影响；在2～8mg·L^-1的总氮浓度下，竹叶眼子菜均可以正常生长。观察结果可知，竹叶眼子菜在5320-12000lx光照强度、30oC、4～8mg·L^-1水体总氮浓度的条件下生长良好，竹叶眼子菜生长虽然对光照强度的要求较高，但其叶往往集中在水体表面形成冠层，能在透明度较低的水体中生长，加上对高温及高营养盐的耐受性较好，故推测竹叶眼子菜可作为夏季富营养化水体中恢复和重建沉水植被的先锋工具种。

To find out the main environmental factors, we used orthogonal test to investigate the effects of light intensity, temperature, total nitrogen concentration and their interaction on P. malatanu by a serial of laboratorial experiments. The results showed that light intensity and temperature, as well as their interaction significantly affect the growth of P. malatanu. Total nitrogen concentration had lower impact on the growth of P. malatanu. Under total nitrogen concentration of 2-8 mg·L^-1 P. malatanu could grow well. In conclusion, P. malatanu can grow well under the conditions of 5320-12000 lx light intensity, 30℃, and 4-8 mg·L^-1. So P. malatanu can be a pioneer plant for eutrophication ecological management in summer.