镇江北固山湿地虉草季节生长动态研究

Seasonal Dynamic of Growth of Phalaris arundinacea in Beigu Mountain Wetland in Zhenjiang

在虉草(Phalaris arundinacea)整个生长季中,定期测量其株长、鞘高、叶龄及生物量等生长指标,分析和研究虉草的季节生长动态。结果显示:虉草各指标的季节生长动态基本一致,皆呈“S”型曲线,且均以三次方程拟合效果最佳。绝对生长速率和相对生长速率基本同步,呈单峰型曲线,但在负增长出现的时间上稍有差异。各生长指标累积绝对、相对生长速率的季节动态也呈“S”型曲线,同样三次方程拟合效果最佳。

In this paper, by periodical measuring the growth indices of Phalaris arundinacea in whole growing process in Beigu Mountain wetland, including plant length, sheath height, leaves age and biomass, the seasonal growing dynamic of P. arundinacea were studied and provided the theoretical and technical data for the resources exploitation of P. arundinacea. The results showed that the seasonal growing dynamics of above four growing indices were similar, and all appeared ＂S＂ curves. Further analysised, the cubic fitting curve was best. The change trend of absolute growth rate and relative growth rate were almost synchrony,and both exhibited monopeaks curve, but there was little difference in time when negative growth rate appeared. The seasonal dynamic of accumulation absolute growth rate and accumulation relative growth rate of growing indices were both ＂S＂ curve shaped ,and the cubic fitting curves were best also.