| Cotonester hjelmqvistii Flinck and Turcz was treated with shading to study its shade-tolerance by examining
the biologic indicators like leaf anatomical structure and new shoot growth increment. The results showed that the stomatal
density of the leaf covered with three layers of shade nets (with 8.0% light transmission rate ) was significantly lower than that
under the other treatments, there were no significant differences of stomatal density among the other treatments. There were
no significant difference in the field of pore size ratio of palisade and spongy tissue thickness among each treatment. Leaf
thickness under full sunlight was significantly higher than that covered with two layers of shade nets (with 17.5% light
transmittance) and was very significantly higher than that treated with three layers, but had no significant difference with one
layer cover treatment (with 45.7% light transmittance). The new shoot growth increment under full light condition was
significantly higher than that of the shading treatments, the internodes length under full light condition was very significantly
lower than shading treatments. Conclusions could be drawn from indexes evaluated and the observation that C. hjelmqvistii
Flinck and Turcz grew well under full light condition and also had shade-tolerance in a certain degree and could grow
normally under one layer of shading net with 22 864 lx of light intensity and 45.7% of light transmission rate. |
