中国草地学报2025，Vol.47Issue(6)：46-55,10.DOI:10.16742/j.zgcdxb.20240431
不同水平氮添加对晋北赖草光合特性的影响
Effects of Different Nitrogen Addition Levels on Photosynthetic Characteristics of Leymus secalinus in Northern Shanxi Province
摘要
Abstract
In order to explore the effects of different nitrogen levels on photosynthetic characteristics of Leymus secalinus in Northern Shanxi,this experiment was conducted on the experiment platform estab-lished in 2017 for different nitrogen addition levels in Youyu Loess Plateau Grassland Ecosystem National Research Station,Shanxi Province.Morphological characteristics,chlorophyll content,and photosyn-thetic characteristics of leaves were measured to reveal the response of L.secalinus to nitrogen addition in Northern Shanxi Province.The results showed that:(1)leaf length,leaf width,leaf thickness,and leaf area of L.secalinus exhibited an initial increase followed by a decrease with the rising of nitrogen addition level,peaking under the N8 or N16 treatment.(2)Nitrogen addition had significant effects(P<0.001)on chlorophyll a,b and total chlorophyll contents,whereas carotenoids content was not affected significantly.(3)The net photosynthetic rate(Pn),transpiration rate(Tr),stomatal conductance(Gs),intercellular CO2 concentration(Ci)of L.secalinus leaves increased initially and followed by a decrease with nitrogen addition,while stomatal limitation value and water use efficiency exhibited opposite trends.(4)The net photosynthetic rate had positive correlations with leaf thickness,stomatal limitation value,and water use efficiency(P<0.001),while a negative correlation was found in Pn with leaf length,leaf width,carot-enoids content,intercellular CO2 concentration and stomatal conductance(P<0.001).Nitrogen addition influenced leaf net photosynthetic rate by modifying leaf morphological traits,chlorophyll content,and gas exchange parameters.In conclusion,the appropriate amount of nitrogen addition can promote the growth and photosynthetic capacity of L.secalinus in Northern Shanxi.This research provides data support for the research on grassland ecosystem service under the nitrogen deposition scenarios.关键词
氮沉降/晋北地区/赖草/光合性能/可持续发展Key words
Nitrogen deposition/Northern Shanxi/Leymus secalinus/Photosynthetic performance/Sus-tainable development分类
农业科技引用本文复制引用
常玉良,朱熠辰,王睿,庞高亮,贾会丽,董宽虎..不同水平氮添加对晋北赖草光合特性的影响[J].中国草地学报,2025,47(6):46-55,10.基金项目
山西省自然科学研究面上项目(20210302123406) （20210302123406）
山西农业大学博士科研启动项目(2021BQ36) （2021BQ36）
国家自然科学基金区域创新发展联合基金重点项目(U22A20576) （U22A20576）
山西省重点实验室项目(202104010910017) （202104010910017）
