不同遮荫处理对林下半夏生长及光合特性的影响

摘要

The effects of different canopy density on the growth and photosynthetic characteristics of Pinellia ternata were studied under three shading treatments.The results showed that under the shading treatment of plant row spacing as 1.0 m × 1.5 m with the canopy density of 57.4％,the Pinellia ternata plants grew faster,the leaves were larger and the number of leaves increased more.The photosynthetic rate of plants decreased with the increase of shading degree,and they were all lower than that of full light treatment.Comprehensive analysis showed that moderate shading could improve the growth rate of Pinellia ternata and improve the sprout tumble situation.The shading treatment with canopy density of 57.4％ could provide suitable environmental conditions for the growth and development of Pinellia ternata,which had important significance to improve Pinellia ternata total output.%通过选择3种不同郁闭度的林地,构造3种不同的遮荫处理,研究其对林下半夏生长及光合特性的影响.结果表明:同一生育时期的半夏在林木株行距为1.0m×1.5m(郁闭度为57.4％)遮荫处理时植株生长较快,叶片较大,叶片数增加较多;植株光合速率随着遮荫程度的加大而减小,且均低于全光照处理.综合分析认为,适度遮荫可以提高半夏的生长速率,改善倒苗状况,郁闭度为57.4％的林木遮荫处理可为半夏生长发育提供较适宜的环境条件,对提高其总产量具有重要意义.