摘要
在大田条件下研究不同遮阴程度对凤丹白(牡丹)苗期光合特性和叶绿素荧光参数的影响。结果表明:在夏季晴天、自然光照条件下,凤丹白苗期的光合速率日变化表现为"双峰型",有明显的"光合午休"现象,净光合速率显著低于遮阴处理;当年生苗遮阴75%条件下,净光合速率没有出现"光合午休"现象,2年生苗遮阴60%条件下,净光合速率显著高于其他处理。自然光照条件下,2年生苗的最大净光合速率和表观量子效率显著高于1年生苗。经过遮阴处理的F_v/F_m均显著高于全光照植株。试验结果说明:夏季大田中午强光、高温条件下,凤丹白幼苗光合作用受光抑制显著,遮阴可有效减轻光抑制,综合比较各参数可知,遮阴60%最适合凤丹白播种苗的生长。
The effects of shading treatment at different degrees on photosynthetic characters and the chlorophyll fluorescence parameters in Paeonia ostii cv. ＇Phoenix White＇ （tree peony） seedling were researched in the field. The results showed that under natural full sunshine in summer, the curve of diurnal variation of the net photosynthetic rate was double-peak type with obvious midday depression of photosynthesis, and the net photosynthetic rate was significantly lower than those in the shading treatments. One-year-old seedlings did not found the phenomenon of midday depression under the condition of 75% shading, and two-year-old seedlings under the condition of 60% shading had higher level of net photosynthetic rate than the other treatments. Compared with one-year-old seedlings, two-year-old seedlings had significantly higher maximum net photosynthetic rate and apparent quantum yield under natural full sunshine. The values of FJFm of plants in shading treatments were significantly higher than that under full sunshine. The results showed that the seedlings in the field had significant photo inhibition under the conditions of strong light high temperature in the midday of summer, and shading treatment could effectively relieve photo inhibition. It was concluded that 60% shading was suitable for growth ofP ostii cv. ＇Phoenix White＇ seedlings.
出处
《经济林研究》
北大核心
2017年第2期84-89,共6页
Non-wood Forest Research
基金
河南省产学研合作计划项目"油用牡丹苗木产业化开发与示范"(132107000043)
国家农业综合开发名优经济林"河南省林科院油用牡丹示范项目"([2015]23号)
关键词
凤丹白(牡丹)
苗期
遮阴
光合特性
荧光参数
Paeonia ostii cv. ＇Phoenix White＇ （tree peony）
seedling period
shade
photosynthetic characteristics
fluorescence parameters
