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为太湖地区凤眼莲高产栽培技术提供技术支持,以江苏地区人工围养生长的凤眼莲群落为研究对象,在8月份其旺盛生长季节,采用LI-6400光合作用测定系统,以开放式气路测定了其不同叶位的净光合速率,以及功能叶片在不同光照度和温度时的光合曲线。结果发现,倒3~倒6叶都是成熟的光合功能叶片,其中倒4叶的最大光合速率(Pmax)、光补偿点(LCP)和表观量子效率(AQE)分别为(34.50±0.72)μmol/(m2.s)、(20.25±3.6)μmol/(m2.s)和0.053 2±0.001 4,均显著高于水稻和玉米;凤眼莲光饱和点为(2 458±69)μmol/(m2.s),也明显高于水稻,与玉米接近。认为江苏地区光合有效辐射和大气温度是限制凤眼莲生物量的重要环境因子。
In order to provide technical support for high-yielding cultivation techniques of Eichhornia crassipes in Taihu Lake, the community of Eichhornia crassipes growing in artificial enclosure in Jiangsu Province was taken as research object. In its vigorous growing season in August, LI-6400 photosynthesis system was used to measure the open- The net photosynthetic rate at different leaf positions and the photosynthetic curve of functional leaves under different illumination and temperature were determined. The results showed that all the photosynthetic functional leaves from the third to the sixth inversions were mature, the maximum photosynthetic rate (Pmax), light compensation point (LCP) and apparent quantum yield (AQE) of the inverted 4 leaves were (34.50 ± 0.72) (20.4 ± 3.6) μmol / (m2.s) and 0.053 2 ± 0.001 4 were significantly higher than those of rice and maize. The light saturation point (2 458 ± 69) μmol / (m2.s), also significantly higher than rice, close to corn. It is concluded that photosynthetically active radiation and atmospheric temperature in Jiangsu Province are important environmental factors that limit the biomass of Eichhornia crassipes.