| 贝加尔针茅光合特征与叶片功能特性对长期氮添加的响应 |
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| 引用本文： | 刘红梅,李洁,皇甫超河,陈新微,杨殿林.贝加尔针茅光合特征与叶片功能特性对长期氮添加的响应[J].草业学报,2016,25(11):76-85. |
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| 作者姓名： | 刘红梅 李洁 皇甫超河 陈新微 杨殿林 |
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| 作者单位： | 农业部环境保护科研监测所,天津,300191 |
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| 基金项目： | 国家自然科学基金项目(31170435)资助。 |
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| 摘 要： | 以贝加尔针茅草甸草原建群种贝加尔针茅为研究对象,通过一个连续6年氮添加野外控制试验,设置5个氮素处理:N_0(0kg N/hm~2)、N_(30)(30kg N/hm~2)、N_(50)(50kg N/hm~2)、N_(100)(100kg N/hm~2)、N_(150)(150kg N/hm~2),探讨氮沉降变化对贝加尔针茅种群光合特性与叶片功能特性变化规律及其影响因子。结果表明,氮素添加变化显著影响贝加尔针茅的净光合速率等光合特性,氮素添加处理净光合速率(net photosynthetic rate,Pn)、气孔导度(stomatal conductance,G_s)、蒸腾速率(transpiration rate,T_r)、光合氮利用效率(photosynthetic nitrogen use efficiency,PNUE)和光合能量利用效率(photosynthetic energy use efficiency,PEUE)均低于或显著低于无氮素添加处理。氮素添加处理叶片比叶面积(specific leaf area,SLA)、叶片N含量(leaf N content,N_(mass))、建成成本(leaf construction cost,CCmass)、叶片N∶P均高于或显著高于无氮素添加处理。相关分析表明,5个氮素处理的Pn与G_s、T_r、PNUE、PEUE、叶片P含量(leaf P content,P_(mass))、土壤N∶P呈显著正相关,与叶片比叶面积(SLA)、N_(mass)、CCmass、土壤含水量、土壤pH值呈极显著负相关;叶片N_(mass)与SLA、CCmass、土壤N∶P呈显著正相关,与PNUE、PEUE、P_(mass)、土壤含水量、土壤pH值呈显著负相关。综合以上研究表明,长期氮添加会降低贝加尔针茅净光合速率、养分利用效率,提高叶片建成成本和叶片N∶P,土壤含水量和土壤pH值是引起这种改变发生的主要因子。
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| 关 键 词： | 氮添加 贝加尔针茅 光合特性 叶片功能特性 |
| 收稿时间： | 2016-03-14 |
Effects of long-term nitrogen addition on photosynthetic characteristics and leaf traits of Stipa baicalensis in Inner Mongolia,China |
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| LIU Hong-Mei,LI Jie,HUANGFU Chao-He,CHEN Xin-Wei,YANG Dian-Lin.Effects of long-term nitrogen addition on photosynthetic characteristics and leaf traits of Stipa baicalensis in Inner Mongolia,China[J].Acta Prataculturae Sinica,2016,25(11):76-85. |
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| Authors: | LIU Hong-Mei LI Jie HUANGFU Chao-He CHEN Xin-Wei YANG Dian-Lin |
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| Abstract: | Atmospheric nitrogen deposition is an important component phenomenon of global change,and in-duces a series of ecological problems.We conducted a field manipulation experiment to study the photosynthet-ic response and change in leaf functional traits after long-term nitrogen addition in an S.baicalensis grassland in Inner Mongolia.This study was conducted from 2010-2015.Five treatments including N0 (0 kg N/ha),N30 (30 kg N/ha),N50 (50 kg N/ha),N100 (100 kg N/ha)and N150 (150 kg N/ha)were set up and forty-eight plots, sized 8 m×8 m,were established with 2 m strips between each plot.The objective was to determine how pho-tosynthetic characteristics and leaf traits vary with nitrogen addition and what causes these differences.Photo-synthetic traits and leaf traits differed among different nitrogen addition treatments.Net photosynthetic rate (Pn), stomatal conductance (Gs), transpiration rate (Tr), photosynthetic nitrogen use efficiency (PNUE), photosynthetic energy use efficiency (PEUE)under N30 ,N50 ,N100 ,and N150 treatments were lower or signifi-cantly lower than those under N0 .Specific leaf area (SLA),leaf N content (N mass), leaf construction cost (CC mass), leaf N∶P under N30 ,N50 ,N100 ,N150 treatments tended to be higher or were significantly higher than those under N0 .Correlation analysis showed that Pn was positively correlated with Gs ,Tr ,PNUE,PEUE, leaf P content (P mass), N mass and soil N,P while Pn was negatively correlated with SLA,N mass ,CC mass ,soil wa-ter content and soil pH;N mass was positively correlated with SLA,CC mass and soil N,P,and N mass was negative-ly correlated with PNUE,PEUE,P mass ,soil water content and soil pH.In conclusion,long-term nitrogen ad-dition induced decreases in Pn and nutrient use efficiency of S .baicalensis ,and increases in leaf CC mass and N∶P.Soil water content and pH decreased with nitrogen addition.This suggests that water content and soil pH are two important factors affecting photosynthetic characteristics and leaf traits of S.baicalensis under different nitrogen addition regimes. |
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| Keywords: | nitrogen addition Stipa baicalensis photosynthetic characteristics leaf traits |
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