节点文献
氮沉降和生物质炭对毛竹叶片光合特性的影响
Photosynthesis with simulated nitrogen deposition and biochar amendments on new and old leaves of Moso bamboo
【摘要】 为了解氮沉降和生物质炭对毛竹Phyllostachys edulis叶片光合特性的影响,研究了4种氮沉降(0 kg·hm-2·a-1,N0;30 kg·hm-2·a-1,N30;60 kg·hm-2·a-1,N60;90 kg·hm-2·a-1,N90)下施加3种不同强度(0 t·hm-2,BC0;20 t·hm-2,BC20;40 t·hm-2,BC40)生物质炭处理后2龄毛竹新老叶片光合及叶绿素荧光特性的变化。结果表明:氮沉降和生物质炭均促进了毛竹新老叶的最大净光合速率(Pmax),气孔导度(Gs)和蒸腾速率(Tr),生物质炭同时提高了老叶实际量子产量[Y(Ⅱ)]和PSⅡ潜在活性(Fv/F0)。与不施加生物质炭相比(BC0),N30下施加20 t·hm-2生物质炭的老叶及N60下施加20 t·hm-2生物质炭(BC20)的新老叶叶色值显著降低;N60处理下施加生物质炭,毛竹新老叶的最大光化学效率(Fv/Fm),Fv/Fo和Y(Ⅱ)均提高,而N90处理下施加生物质炭,毛竹新老叶的Fv/Fm和Fv/Fo均降低。由此认为:氮沉降条件下施加生物质炭有利于毛竹新老叶片的光合固碳能力;大气氮沉降背景下,施加生物质炭有利于提高毛竹生产力。
【Abstract】 To understand the effects of nitrogen(N)deposition and biochar amendments on photosynthesis of new and old leaves of Moso bamboo(Phyllostachys edulis),effects of four N additions(N0:0 kg·hm-2·a-1,N30:30 kg·hm-2·a-1,N60:60 kg·hm-2·a-1,and N90:90 kg·hm-2·a-1)and three biochar amendments(BC0:0 t·hm-2,BC20:20 t·hm-2,and BC40:40 t·hm-2)on photosynthesis and chlorophyll fluorescence characteristics of new and old leaves in two-year-old Moso bamboo were determined using LI-6400 portable photosynthesis system,PAM-2500 chlorophyll fluorescence spectrometer and SPAD-502 chlorophyll meter in Moso bamboo plantations(20m×20 m).Results showed that N deposition and biochar amendment significantly increased(P<0.05)the maximum net photosynthetic rate(Pmax),stomatal conductance(Gs),and transpiration rate(Tr)of new and old leaves.Biochar amendments significantly increased(P<0.001)effective quantum yield of PhotosystemⅡ(PS-Ⅱ)[Y(Ⅱ)]and potential activities of PS-Ⅱ(Fv/F0)of old leaves.In combination with both N depositions(N30and N60),BC20significantly decreased(P<0.001)the relative chlorophyll content(SPAD)of old leaves compared with the N depositions alone.The SPAD of new leaves for N60-BC20was significantly lower(P<0.001)than N60-BC0.Also,both biochar amendments in combination with N60significantly increased(P<0.001)maximal potential quantum yield of PS-Ⅱ(Fv/Fm),Fv/Fo,and Y(Ⅱ)of new and old leaves compared to N depositions alone.However,biochar amendments in combination with N90significantly decreased(P<0.001)both Fv/Fmand Fv/Foof new and old leaves compared to N depositions alone.In conclusion,this study demonstrated that biochar amendments promoted photosynthesis of leaves and thus increased productivity of a Moso bamboo forest with the background of globally increasing N deposition.
【Key words】 botany; nitrogen deposition; biochar; Moso bamboo; chlorophyll fluorescence;
- 【文献出处】 浙江农林大学学报 ,Journal of Zhejiang A & F University , 编辑部邮箱 ,2019年04期
- 【分类号】S795.7
- 【被引频次】6
- 【下载频次】295