摘要
为了阐明湿地植物小叶章光合特性对氮沉降响应的变化规律,选择三江平原沼泽化小叶章为研究对象,通过野外原位控制试验,研究了3个氮水平[0gN/m2(N1)、5gN/m2(N2)和10gN/m2(N3)]对小叶章光合色素及光合参数的影响。结果表明,随着施氮水平的增加,小叶章的全氮含量、光合色素含量、光合参数AQE和Amax均呈增加趋势,但Rd则呈现先升高后下降的趋势,表明N3处理更能促进小叶章净碳的累积;光合参数Vcmax和Jmax也呈增加趋势,这有利于小叶章在低温环境下进行光合作用,维持施氮条件下较高光合能力。
In order to determine the effect of increased nitrogen deposition on photosynthetic characteristics of C.angustifolia,a field experiment was carried out with treatments different in nitrogen supply（0,5,10g/m2）to investigate the effects the photosynthetic pigments and photosynthetic parameters.The response curves of net photosynthetic rate（Pn）versus photosynthetically active radiation（PAR）and intercellular CO2 concentration（Ci）were measured in situ.The results showed that nitrogen deposition significantly increased nitrogen content,photosynthetic pigment content,Amax and AQE of leaves.However,Rd declined in low N but enhanced in high N,which showed the higher carbon accumulation under high N than low N.J max and V cmax enhanced under nitrogen supply,which could maintain higher photosynthetic capacity under low-temperature.
出处
《中国农学通报》
CSCD
2013年第7期45-49,共5页
Chinese Agricultural Science Bulletin
基金
国家自然科学基金"三江湿地小叶章群落光合生理生态特性对氮沉降和CO2升高的响应"(30970452)
"三江平原湿地小叶章群落结构与功能对氮沉降和CO2升高的响应"(31170462)
黑龙江杰出青年基金"三江平原湿地植被复杂适应系统(CAS)的生态学基础"(JC03-09)
黑龙江省财政基本科研业务费专项课题"三江平原湿地响应CO2升高和氮沉降的生态学基础"
关键词
小叶章
氮沉降
光响应曲线
光合色素
CO2响应曲线
Calamagrostis angustifolia
nitrogen deposition
light response curve
photosynthetic pigments
CO2 response curve
