文献类型：期刊文献

中文题名：4种湿地植物光合作用特性的比较研究

英文题名：Comparative Study on Photosynthetic Characteristics of Hydrophytes in Constructed Wetland

作者：李林锋[1,2]

机构：[1]广东海洋大学农学院;[2]中国科学院植物研究所植被与环境变化国家重点实验室

年份：2008

卷号：28

期号：10

起止页码：2094

中文期刊名：西北植物学报

外文期刊名：Acta Botanica Boreali-Occidentalia Sinica

收录：CSTPCD、、北大核心2004、CSCD2011_2012、北大核心、CSCD

基金：国家"十五"重大科技专项(2002AA601013)

语种：中文

中文关键词：鸢尾;菖蒲;水葱;千屈菜;净光合速率;通径分析

外文关键词：Iris pseudacorus ;Acorus calamus ;Scirpus validus ;L ythrum salicaria;net photosynthetic rate; path analysis

中文摘要：以4种湿地植物鸢尾、菖蒲、水葱和千屈菜为材料,在水平潜流人工湿地处理单元中,采用便携式LI-6400光合作用测定仪在晴朗天气下测定了各材料成熟叶片净光合速率（Pn）以及光合有效辐射（PAR）、气孔导度（Gs）、细胞间CO2浓度（Ci）、叶温（Tl））、叶周围气温（Ta）和蒸腾速率（Tr）,以探讨其光合生理生态特性。结果表明：（1）4种湿地植物叶片净光合速率（Pn）日变化均呈不对称的双峰曲线,光合“午休”现象明显,它们的净光合速率日均值表现为水葱〉菖蒲〉鸢尾〉千屈菜,但种间差异不显著。（2）Gs、PAR、Ci和Tr与湿地植物Pn的日变化有着极显著或显著的相关关系,其中Gs、PAR、Ci是影响鸢尾Pn的主要因子,影响大小的顺序为Gs〉PAR〉Ci;Gs和Tr是影响菖蒲和千屈菜Pn的主要因子,影响大小的顺序为Gs〉Tr;而Gs是影响水葱Pn的主要因子。（3）4种湿地植物Pn-PFD响应曲线及Pn-CO2响应曲线都具有相似的二次方程曲线变化规律;光补偿点表现为千屈菜〉水葱〉鸢尾〉菖蒲,光饱和点表现为水葱〉菖蒲〉千屈菜〉鸢尾;CO2补偿点表现为水葱〉鸢尾〉菖蒲〉千屈菜,CO2饱和点表现为菖蒲〉千屈菜〉鸢尾〉水葱。（4）4种湿地植物的表观量子效率为0.0198～0.0383mol·mol-1,羧化效率为0.0426～0.0648mol·m-2.s-1。研究发现,4种湿地植物在给定条件下的日平均净光合速率、光能利用效率和CO2同化能力无显著差异,且气孔限制是产生光合“午休”的主要原因;影响它们光合速率的主要生理生态因子各不相同,但气孔导度均为主要因子。

外文摘要：The LI-6400 portable photosynthetic system was employed to measure the net photosynthetic rate （Pn）, photosynthetically active radiation （PAR）, stomatal conductance （Gs）, intercellular carbon dioxide concentration （Ci） ,leaf temperature （Tl）, atmospheric temperature （Ta） around the leaves and transpiration rate （Tr） of Iris pseudacorus ,Acorus calamus, Scirpus validus and L ythrum salicaria , which growth in horizontal-subsurface constructed wetland units, in order to study and compare their photosynthetic characteristics. The results were as follows. The curves of diurnal variation of Pn in leaves of four wetland plants showed two peaks which indicated a remarkable photosynthetic ＂midday depressions＂. The analysis of partial correlation and path on Pn and its factors showed that the diurnal variation of Pn in leaves of wetland plants had significant correlation with Gs, PAR, Ci and Tr, respectively. Gs, PAR and C1 were the main factors which affected Pn of Iris pseudacorus and the order of effecting ability was Gs〉PAR〉Ci〉;Gs and Tr were the main factors which affected Pn of both Acorus calamus and Lythrum salicaria and the order of effecting ability was Gs〉 Tr, respectively;Ci was the only main factor which affected Pn of Scirpus validus. The order of the average values of Pn was Scirpus validus〉Acorus calamus 〉 Iris pseudacorus〉Lythrum salicaria. However,there was no significant difference among them. For the four kinds of plants, the Pn-PFD response curves and Pn-CO2 response curves had the same regular change, which could be quantitatively described by quadratic equation,respectively. The order of the light compensation points was Lythrum salicaria 〉 Scirpus validus 〉 Iris pseudacorus 〉 Acorus calamus. The order of the light saturation points was Scirpus validus〉Acorus calamus〉L ythrum salicaria〉 Iris pseudacorus. The order of the carbon dioxide compensation points was Scirpus validus 〉Iris pseudacorus 〉Acorus calamus 〉 L ythrum salicaria and the order of the carbon dioxide saturation point was Acorus calamus〉Lythrum salicaria 〉Iris pseudacorus〉Scirpus validus. The apparent quantum yield and carboxylation efficiency of four kinds of wetland plants,on daily basis,were varied from 0. 019 8 to 0. 038 3 mol·mol^-1 and 0. 042 6 to 0. 064 8 mol· m^-2· s^-1 ,respectively. The results indicated that the average net photosynthetic rate, energy efficiency and CO2 assimilation capacity were not significantly different among the four kinds of wetland plants and the photosynthetic ＂midday depressions＂ was mainly resulted from stomatal limitation.