生态环境学报2016，Vol.25Issue(6)：973-980,8.DOI:10.16258/j.cnki.1674-5906.2016.06.009
贝加尔针茅草原羊草光合特征对氮沉降的响应
Photosynthetic Characteristics of Leymus chinensis in Response to Simulated Nitrogen Deposition in Inner Mongolia, China
摘要
Abstract
Increasing atmospheric nitrogen deposition is one of the hot topics related to global climate change. Studying the effects of nitrogen deposition on morphological and physiological characteristics of plants increasingly becomes a major focus in the field of ecological sciences. We conducted a field manipulation experiment to study the response of Photosynthetic characteristics and leaf functional traits of Leymus chinensis in response to simulated nitrogen deposition in a Stipa baicalensis grassland in inner Mongolia. This study was conducted during 2010—2015, five treatments including 0 kg·hm-2(CK)、30 kg·hm-2(N30)、50 kg·hm-2(N50)、100 kg·hm-2 (N100)、150 kg·hm-2(N150)were conducted. Forty-eight (8 m×8 m) plots were established with 2 m belts between treatment areas, respectively. The results showed that the light saturation point (LSP) of N30, N50, N100, N150 significantly lower than that of CK by 40.32, 19.73, 38.18, 37.75 percent, respectively (P<0.05). Maximum net photosynthetic rate (Pnmax) of N30, N50, N100, N150 were significantly lower than that of CK by 22.51, 48.56, 27.43, 50.72 percent, respectively (P<0.05). Leaf N content (Nmass), leaf P content (Pmass) and leaf construction cost (CCmass) of N30, N50, N100, N150 were significantly higher than that of CK. Photosynthetic energy use efficiency (PEUE) and photosynthetic nitrogen use efficiency (PNUE) of N30, N50, N100, N150 were significantly lower than that of CK. Correlation analysis showed that Pnmax were positively correlated with PEUE and PNUE (P<0.01), leaf Nmass were positively correlated with specific leaf area (SLA), Pmass and CCmass (P<0.01), CCmass were positively correlated with SLA (P<0.01). In summary, nitrogen deposition induced the decrease of PEUE, PNUE of Leymus chinensis, and the increased leaf mass and leaf N/P.关键词
氮沉降/贝加尔针茅草原/羊草/光合特性/叶片功能特性Key words
nitrogen deposition/Stipa baicalensis grassland/Leymus chinensis/photosynthetic characteristics/leaf traits分类
农业科技引用本文复制引用
刘红梅,李洁,陈新微,杨殿林,皇甫超河..贝加尔针茅草原羊草光合特征对氮沉降的响应[J].生态环境学报,2016,25(6):973-980,8.基金项目
国家自然科学基金项目 （）
