氮沉降背景下遮阴对虎耳草生长和光合作用的影响
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摘要
【目的】分析遮阴对虎耳草生长和光合作用的影响,为氮沉降背景下虎耳草的栽培利用提供理论依据。【方法】以虎耳草为试验材料,在0(L0处理,不遮阴)、40%(L1处理,轻度遮阴)、80%(L2处理,中度遮阴)和90%(L3处理,重度遮阴)4个光处理中设不施氮(N0)和施氮30.0 g/m~2(N1)处理,测定分析各处理虎耳草的生长和光合作用指标。【结果】在不施氮处理(L0N0、L1N0、L2N0和L3N0)中,轻、中、重度遮阴处理(L1N0、L2N0和L3N0)虎耳草的叶宽、叶长、总叶面积、株高、总叶片数、茎生物量、总叶绿素含量、实际光量子产量(YII)和最大光量子产量(F_v/F_m)均高于不遮阴处理(L0N0);在施氮30.0 g/m~2处理(L0N1、L1N1、L2N1和L3N1)中,轻、中、重度遮阴处理(L1N1、L2N1和L3N1)虎耳草的叶宽、叶长、总叶面积、株高、根长、匍匐茎条数、总叶片数、比叶面积、叶生物量、茎生物量、总生物量、总叶绿素含量、YII、F_v/F_m和光化学淬灭(q P)均高于不遮阴处理(L0N1),其中叶宽、叶长、总叶面积、株高、根长、匍匐茎条数、总叶片数、叶生物量、茎生物量、总生物量、YII和F_v/F_m均在轻度遮阴时达最大值。不遮阴处理下施氮30.0 g/m~2虽然增加虎耳草叶片的总叶绿素含量,但抑制其生长和光合作用;遮阴处理下施氮30.0 g/m~2可促进虎耳草的光合作用。【结论】虎耳草生长过程中施氮30.0 g/m2可增加其总叶绿素含量,但生长发育受到限制;轻度遮阴(遮阴40%)能缓解氮沉降对虎耳草生长发育的抑制作用,有效增强其对光能的捕获能力,在一定程度上提高虎耳草对逆境的适应性。
【Objective】The effects of shading on the growth and photosynthesis of Saxifraga stolonifera Curt. were analyzed to provide a theoretical basis for the cultivation and utilization of S. stolonifera under the background of nitrogen deposition.【Method】S. stolonifera was used as test material. In the four light treatments of 0(L0 treatment,no shading),40%(L1 treatment,mild shading),80%(L2 treatment,moderate shading)and 90%(L3 treatment,severe shading),no nitrogen(N0)and nitrogen application of 30.0 g/m2(N1)were used to determine the growth and photosynthesis indicators of the various treatments of S. stolonifera.【Result】Leaf width,leaf length,total leaf area,plant height,total leaf number,stem biomass,total chlorophyll content,actual photon yield(YII)and maximum photon yield(F_v/F_m)of light,medium and severe shading treatments(L1 N0,L2 N0 and L3 N0)in no nitrogen treatment were higher than no shading treatment(L0 N0). For mild,moderate and severe shading treatments with nitrogen application of 30.0 g/m2(L0 N1,L1 N1,L2 N1 and L3 N1)out of all nitrogen application treatments(L0 N1,L1 N1,L2 N1 and L3 N1),leaf width,leaf length,total leaf area,plant height,root length,number of stolons,total number of leaves,specific leaf area,leaf biomass,stem biomass,total biomass,total chlorophyll content,YII,F_v/F_mand photochemical quenching(qP)were higher than no shading treatment(L0 N1),in which leaf width,leaf length,total leaf area,plant height,root length,number of stolons,total number of leaves,leaf biomass,stem biomass,total biomass,YII and F_v/F_mall reached maximum at mild shading. Nitrogen application of 30.0 g/m~2 without shading treatment increased the total chlorophyll content of S. stolonifera leaves,but inhibited its growth and photosynthesis. Nitrogen application of 30.0 g/m~2 under shading treatment promoted the photosynthesis of S.stolonifera.【Conclusion】Nitrogen application of 30.0 g/m~2 can increase the chlorophyll content during the growth of S.stolonifera,but its growth and development are limited. Mild shading(40% shading)can alleviate the inhibition of nitrogen deposition on the growth and development of S. stolonifera,and increase the light capture capacity of S. stolonifera.The ability to capture,to a certain extent,improve the adaptability of S. stolonifera to adversity.
【Objective】The effects of shading on the growth and photosynthesis of Saxifraga stolonifera Curt. were analyzed to provide a theoretical basis for the cultivation and utilization of S. stolonifera under the background of nitrogen deposition.【Method】S. stolonifera was used as test material. In the four light treatments of 0(L0 treatment,no shading),40%(L1 treatment,mild shading),80%(L2 treatment,moderate shading)and 90%(L3 treatment,severe shading),no nitrogen(N0)and nitrogen application of 30.0 g/m2(N1)were used to determine the growth and photosynthesis indicators of the various treatments of S. stolonifera.【Result】Leaf width,leaf length,total leaf area,plant height,total leaf number,stem biomass,total chlorophyll content,actual photon yield(YII)and maximum photon yield(F_v/F_m)of light,medium and severe shading treatments(L1 N0,L2 N0 and L3 N0)in no nitrogen treatment were higher than no shading treatment(L0 N0). For mild,moderate and severe shading treatments with nitrogen application of 30.0 g/m2(L0 N1,L1 N1,L2 N1 and L3 N1)out of all nitrogen application treatments(L0 N1,L1 N1,L2 N1 and L3 N1),leaf width,leaf length,total leaf area,plant height,root length,number of stolons,total number of leaves,specific leaf area,leaf biomass,stem biomass,total biomass,total chlorophyll content,YII,F_v/F_mand photochemical quenching(qP)were higher than no shading treatment(L0 N1),in which leaf width,leaf length,total leaf area,plant height,root length,number of stolons,total number of leaves,leaf biomass,stem biomass,total biomass,YII and F_v/F_mall reached maximum at mild shading. Nitrogen application of 30.0 g/m~2 without shading treatment increased the total chlorophyll content of S. stolonifera leaves,but inhibited its growth and photosynthesis. Nitrogen application of 30.0 g/m~2 under shading treatment promoted the photosynthesis of S.stolonifera.【Conclusion】Nitrogen application of 30.0 g/m~2 can increase the chlorophyll content during the growth of S.stolonifera,but its growth and development are limited. Mild shading(40% shading)can alleviate the inhibition of nitrogen deposition on the growth and development of S. stolonifera,and increase the light capture capacity of S. stolonifera.The ability to capture,to a certain extent,improve the adaptability of S. stolonifera to adversity.
引文
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