马尾松老头林混交杨梅后叶绿素含量和光合特性分析

Chlorophyll Content and Photosynthesis Characteristics in Old-Man-Forest of Pinus massoniana after Mixed with Myrica rubra

通过比较分析紫色土侵蚀区马尾松老头林混交杨梅后混交树种的生长状况、叶绿素含量及光合特性的差异,试图揭示混交的营林模式对混交树种生理生态的影响。结果表明:马尾松老头林混交杨梅后,马尾松的胸径和树高分别增加45.55%和35.90%,其叶片叶绿素a、b和叶绿素a+b表现为略有增加,而叶绿素a/b比值从2.246减少到2.181;马尾松老头林混交杨梅后,马尾松的最大净光合速率和量子效率均表现为显著增加,光的补偿点表现为略为减少,而光的饱和点表现为略为增加,表明混交杨梅后增强了马尾松的光合能力。

In order to reveal the effect of mixing mode on physiological ecology of mixing species,the growth status, chlorophyll content & photosynthesis characteristics of mixed species for old-man-forest of Pinus massoniana after mixed with Myrica rubra were analyzed in the purple erosion soil zone.Result shows that:diameter & tree height of Pinus massoniana respectively increase by 45.55% & 35.90% after mixed with Myrica rubra in old-man-forest of Pinus massoniana ;chlorophyll a,chlorophyll b and chlorophyll a+ b content of the leaf for Pinus massoniana have slight increase,and chlorophyll a/b value reduce form 2.246 to 2.181;after mixed with Myrica rubra in old-man forest of Pinus massoniana ,the maximum net photosynthetic rate & quantum utilization efficiency increase significantly;the light compensate point increase slightly and the light saturate point decrease slightly,which indi-cates photosynthesis ability of Pinus massoniana was improved after mixed with Myrica rubra .