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作 者 ：彭晓邦,蔡靖,姜在民,张远迎,张硕新*

期 刊 ：生态学报 2009年 29卷 6期 页码：3173~3180

关键词：农林复合；光合特性；荧光参数；黄土区；

Keywords:Agroforestry, photosynthetic characteristics, chlorophyll fluorescence parameters, Loess Area,

摘 要 ：研究了农林复合系统不同处理对大豆、辣椒的光合特性和叶绿素荧光参数的影响。结果表明，从单作到距李子1m处，随着距李子树越近，遮光愈多。各处理大豆、辣椒的光合速率（Pn）、气孔导度（Gs）和蒸腾速率（Tr）表现出与光合有效辐射（PAR）基本一致的日变化模式，且与单作相比，各处理大豆、辣椒的光合速率、气孔导度和蒸腾速率均有不同程度的降低。相关性分析结果表明二者的光合速率、气孔导度及蒸腾速率均与光合有效辐射呈正相关关系。随着遮荫程度的提高，大豆、辣椒叶绿素含量和表观量子效率（Ф）升高，光饱和点（LSP）和光补偿点（LCP）降低。二者叶绿素荧光参数最大光能转换效率( Fv / Fm ) 、PSⅡ电子传递量子效率(ФPSⅡ ) 以及光化学猝灭系数( qP)均有不同程度的升高，而非光化学猝灭系数( qN P)却逐渐降低。说明大豆、辣椒能适应弱光环境，在较低的光照条件下正常生长。

Abstract:Photosynthetic characteristics and parameters of chlorophyll fluorescence of soybean and pepper were examined in an agroforestry system. The results indicated that photosynthetic active radiation (PAR) was reduced significantly from full daylight at 1m from the tree (Prunus salicina) row. The diurnal variations of photosynthetic rate (Pn), stomata conductance (Gs) and transpiration rate (Tr) of soybean and pepper were similar to photosynthetic active radiation, and they were lower in the agroforestry system compared to full daylight. The PAR was highly correlated with Pn, Gs and Tr of the both crops. The content of total chlorophyll and apparent quantum yield (Ф) of both crops increased and light compensation point (LCP) and light saturation point (LSP) decreased with increasing degree of shade. Meanwhile the Fv / Fm, ФPSⅡ and qP were significantly higher than those under full daylight in treatments of both crops, but qN P decreased with increasing degree of shade, which indicated that soybean and pepper had strong adaptability to low irradiance.

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