不同种植方式对黄菖蒲、水葱和菖蒲3种挺水植物生长的影响

以黄菖蒲、水葱与菖蒲3 种挺水植物为材料，在常规种植密度下设置纯植、块状混植与株间混植3种种植方式，分析不同种植方式对植株生长的影响。结果显示，黄菖蒲与菖蒲共同种植其伸长率(ER)均高于纯植方式；块状混植方式下黄菖蒲的平均生长速率(AGR)高于纯植方式，而菖蒲的AGR 则低于纯植方式；株间混植方式下两者的AGR均高于纯植方式。两者分别与水葱株间混植时，水葱的ER 在块状混植与株间混植方式下均比纯植方式高，而菖蒲与黄菖蒲的ER 则均比纯植方式低；株间混植时水葱与黄菖蒲的AGR 均低于纯植方式，菖蒲的AGR 在块状混植方式下比纯植方式低，株间混植方式下则与纯植相当。结果表明，菖蒲与黄菖蒲株间混植有利于相互植株的较快增加和生物产量的较快累积，体现出相互促进效应；而它们与水葱株间混植时，水葱会通过快速的株高伸长，对菖蒲与黄菖蒲形成一定的抑制效应。

Effects of Different Planting Methods on the Growth of Iris pseudacorus, Scirpus validus and Acorus calamus

The author systematically analyzed the planting methods among Iris pseudacorus, Scirpus validus and Acorus calamus with normal planting density but different planting models which were pure plantation, mixed by group plants, and mixed by individual plant. The results showed that I. pseudacorus and A. calamus possessed relatively higher elongation rate (ER) under the mixture plantation method than pure plantation. The average growth rate (AGR) of I. pseudacorus was somewhat higher than that under pure plantation. However, it was the contrary for A. calamus. When I. pseudacorus and A. calamus was planted with S. validus respectively, the ER of S. validus under the mixture plantation model was statistically higher than that under pure plantation, while I. pseudacorus and A. calamus exhibited relatively lower ER than that under pure plantation. In addition, when mixed by individual plant, the AGR of I. pseudacorus and S. validus were lower than that under pure plantation. The AGR of A. calamus was lower under the model mixed by group plants than that under pure plantation, but turned to equals between the planting methods of mixed by individual plant and pure plantation. These results indicated that when I. pseudacorus and A. calamus were mix-planted with each other, they could promote a relatively higher rapid ratio in the elongation of the stem and faster accumulation of biomass, showing facilitation. On the contrary, when these two species were planted with S. validus separately, the latter would exhibit a faster elongation in the stem to restrain the former two.