荫蔽度对巢蕨生长的影响

通过6种不同荫蔽度处理,即处理A(56％)、处理B(64％)、处理C(70％)、处理D(82％)、处理E(88％)和处理F(91％),研究了荫蔽度对巢蕨生长的影响.结果表明:荫蔽度对巢蕨叶绿素相对含量、叶长、叶宽、新增叶片数和植株死亡数均有不同程度的影响；其中,对叶绿素相对含量的影响依次为F＞E＞D＞C＞B＞A；对叶长的影响为E＞F＞D＞C＞B＞A；对叶宽的影响为E＞D＞C＞F＞B＞A；对新增叶片数的影响为D＞C＞B＞F＞E＞A；对巢蕨死亡率的影响为A＞C＞B＞E=D＞F.荫蔽度与叶绿素相对含量呈正相关；对叶长、叶宽影响呈曲线变化,处理E最有利于巢蕨叶片生长；较强的阳光有利于叶片代偿性数量增加,过强的阳光会导致植株死亡.综合分析得出,通过控制荫蔽度可以调控新生叶数量和叶片生长,适宜巢蕨健康生长的荫蔽度在88％以上.

The Effect of Shading on the Growth of Neottoptis nidus

The nest fern Neottoptis nidus was treated with shading at 6 levels （treatments A（56% ）, B（64% ）, C（70% ）, D（82% ）, E（88% ）, F（91% ） ） to observe its growth. The results showed that different levels of shading gave different effects on the relative content of chlorophyll, leaf length, leaf width, leaf number and plant death number. The shading effects on the relative chlorophyll content were in the order of treatments F 〉 E 〉 D 〉 C 〉 B 〉 A ; the effects on the leaf length were E 〉 E 〉 D 〉 C 〉 B 〉 A ; the effects on leaf width were E 〉 D 〉 C 〉 F 〉 B 〉 A ; the effects on the number of new leaves were D 〉 C 〉 B 〉 F 〉 E 〉 A ; the effects on nest fern mortality were A 〉 C 〉 B 〉 E = D 〉 F. Shading is positively correlated with the relative chlorophyll content. The shading effect on leaf length and width is changed in a curve way, and the treatment E is found most favorable for nest fern growth. The higher irradiance is beneficial to leaf number increase, but very strong sunshine may kill the fern. Shading at given levels can control the growth of new leaves and the number of leaves. It is concluded that the nest fern grows better under the shading above 88%.