施肥对毛竹叶片光合生理的影响

为了揭示毛竹Phyllostachys pubescens施肥增产的内部机制，进而确定毛竹合理施肥时期，以3种施肥模式的竹林（①近5 a内每年5月初施肥，②近5 a内每年8月底施肥，③连续10 a 未施肥）为对象，于2008年5 - 12月对毛竹叶片光合速率、光合色素、可溶性蛋白及相关酶活性等指标进行动态监测。结果表明：①毛竹叶片从展叶—成熟—休眠，其光合速率年动态变化呈双峰曲线型，光合色素质量分数于10月初达到峰值，可溶性蛋白及过氧化氢酶活性峰值均出现在8月底至9月初；②叶片光合速率与叶绿素a、叶绿素b、类胡萝卜素、可溶性蛋白及过氧化氢酶活性成正相关关系，与叶绿素a/b比值成负相关关系；③施肥能提高毛竹叶片叶绿素a、叶绿素b、类胡萝卜素、可溶性蛋白、光合速率及过氧化氢酶的活性，其中5月施肥最高，8月底施肥次之，不施肥最低，而施肥降低了叶绿素a/b的比值；④8月底施肥延长了叶片的光合功能期，延缓了叶片的衰老进程。图8表1参14

Physiology of leaf photosynthesis with fertilization in Phyllostachys pubescens

The objective was to grasp the mechanism of increasing moso bamboo (Phyllostachys pubescens) production by fertilization. Three fertilization models were set:(1) fertilizer in the begin of May for five years; (2) fertilizer in the late of August for five years; (3) no fertilization for ten years. Photosynthetic rate,photosynthetic pigments,soluble protein,and catalase activity of leaves were measured from May to December in 2008,and a correlation analysis between photosynthetic rate and photosynthetic pigme...