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Position: Home > Articles > Effects of N addition on photosynthetic characteristics and leaf senescence in Stipa bungeana of steppe grasslands in the Loess Plateau Pratacultural Science 2016,33 (6) 1070-1076

氮素添加对黄土高原典型草原长芒草光合特性的影响

作  者:
韩炳宏;尚振艳;袁晓波;安卓;文海燕;李金博;傅华;牛得草
单  位:
深圳市铁汉生态环境股份有限公司;草地农业生态系统国家重点实验室兰州大学草地农业科技学院
关键词:
黄土高原;氮素添加;长芒草;光合特性;叶片衰老
摘  要:
为研究氮沉降对黄土高原典型草原植物代谢功能的影响,本研究通过模拟大气氮沉降的方法对黄土高原天然草地进行了氮添加试验,分析了天然草地植物长芒草(Stipa bungeana)在不同施氮水平下叶片氮含量、光合速率(Pn)、气孔导度(Gs)、蒸腾速率(Tr)、水分利用效率(WUE)以及叶绿素含量的响应特征,探讨了长芒草光合生理特性和叶片衰老的影响对氮添加的响应。结果显示,氮素添加可显著增加长芒草地上生物量(P<0.05),明显增加其所占总生物量的比例,显著增加叶片氮含量、叶绿素含量和净光合速率,而对气孔导度和蒸腾速率没有显著影响(P>0.05),显著提高了植物水分利用效率。另外,氮素添加延缓了长芒草叶绿素的降解速率。以上结果表明,一定范围内的大气氮沉降量有利于长芒草光合能力的提高,可以延缓长芒草叶片的衰老。
译  名:
Effects of N addition on photosynthetic characteristics and leaf senescence in Stipa bungeana of steppe grasslands in the Loess Plateau
作  者:
Han Bing-hong;Shang Zhen-yan;Yuan Xiao-bo;An Zhuo;Wen Hai-yan;Li Jin-bo;Fu Hua;Niu De-cao;State Key Laboratory of Grassland Agro-ecosystem,College of Pastoral Agriculture Science and Technology,Lanzhou University;Shenzhen Tech and Landscape Co.,Ltd.;
关键词:
the Loess Plateau;;N addition;;Stipa bungeana;;photosynthetic characteristic;;leaf senescence
摘  要:
In order to explore the effects of nitrogen(N)deposition on grassland plant metabolism function,this study conducted N fertilization addition on the Loess Plateau natural grassland by simulating nitrogen deposition and analyzed leaves N content,net photosynthetic rate(Pn),stomata conductance(Gs),transpiration rate(Tr),water use efficiency(WUE)and Chlorophyll content of Stipabungeanaon different N addition levels to explore the effects of nitrogen addition on photosynthetic characteristics and leaf senescence of S.bungeana.The results showed the N content,chlorophyll content,net photosynthetic rate and water use efficiency increased significantly with N addition.However,the stomata conductance and transpiration rate did not response to N addition remarkably.In addition,the chlorophyll degradation rate of S.bungeana was delayed by N addition.This paper revealed that nitrogen fertililization played primary roles in regulating photosynthetic characteristics and leaf senescence of S.bungeana,also appropriate nitrogen deposition could improve photosynthetic performance and delay leaf senescence of S.bungeana.

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