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当前位置: 首页 > 文章 > 丛枝菌根真菌对羊草气体交换和δ~(13)C、δ~(15)N的组成影响 核农学报 2008,22 (3) 115-120
Position: Home > Articles > EFFECTS OF ARBUSCULAR MYCORRHIZAL FUNGI ON GAS EXCHANGE AND STABLE ISOTOPE RATIO OF δ~(13)C,δ~(15)N OF Leymus chinensis PLANT Journal of Nuclear Agricultural Sciences 2008,22 (3) 115-120

丛枝菌根真菌对羊草气体交换和δ~(13)C、δ~(15)N的组成影响

作  者：
石伟琦;王国安;李晓林
单  位：
教育部植物-土壤相互作用重点实验室/中国农业大学资源与环境学院
关键词：
丛枝菌根真菌;羊草;δ~(13)C;δ~(15)N
摘  要：
采用盆栽方法研究接种两种丛枝菌根真菌Glomus intraradices,Glomus claroidum对内蒙古典型草原优势种羊草(Leymus chinensis)的气体交换和稳定性同位素组成的影响,对羊草生长第45、60和75天的测定结果表明,丛枝菌根真菌能提高植株的含磷量、叶片的气孔导度和光合速率,降低植株δ15N值,但对羊草的内在水分利用效率和δ13C的组成未产生显著影响;植株生长的不同时期对其气体交换和稳定性同位素δ13C、δ15N均产生显著影响;时间和接种的相互作用显著影响植株的光合速率、δ13C和δ15N;羊草气孔导度和光合速率的提高归因于菌根真菌改善植株磷营养和增加根系碳分配所致;而植株内在水分利用效率和δ13C无显著性差异是因为气孔导度和光合速率总是发生同方向变化造成的;菌根植物具有较低δ15N是源于菌根真菌吸收N,并富集15N,转运给植株贫化的15N所致。试验结果为认识草原植物的碳水平衡和N循环提供了新的思路和借鉴。
译  名：
EFFECTS OF ARBUSCULAR MYCORRHIZAL FUNGI ON GAS EXCHANGE AND STABLE ISOTOPE RATIO OF δ~(13)C,δ~(15)N OF Leymus chinensis PLANT
作  者：
SHI Wei-qi WANG Guo-an LI Xiao-lin(Key Laboratory of Plant-Soil Interactions,Ministry of Education/College of Resources and Environmental Sciences,China Agricultural University,Beijing 100094)
关键词：
arbuscular mycorrhizal fungi;Leymus chinensis;δ~(13)C;δ~(15)N
摘  要：
Leymus chinensis,one of dominant species in Inner Mongolia grassland,was selected to evaluate the effects of arbuscular mycorrhizal fungi(AMF) on plant gas change parameters and stable isotope ratio in pot culture.The plant was inoculated with two mycorrhizal fungi,Glomus intraradices and Glomus claroidum,and the uninoculated plant was used as the control check.On the 45 th,60 th,75 th days after sowing,gas exchange parameters and stable isotope ratio were measured.The results showed that AM infection promoted phosphorus content,stomatal conductance and photosynthetic rate of Leymus chinensis,reduced host δ 15N,however,it did not influence host intrinsic water using efficiency and δ 13C.It was the growth time that significantly affected the gas exchange and stable isotope ratio of δ 13C and δ 15N.And the interaction of inoculation and growth time also influenced on the net photosynthetic rate,δ 13C and δ 15N of the host.Stomatal conductance and photosynthetic rate were always changed the same direction by arbuscular mycorrhizal fungi causing no significant difference between mycorrhizal and non-mycorrhizal plant.AMF absorbed nitrogen and accumulated δ 15N,thus,it transformed less 15N into the host,and as a result,the mycorrhizal plant had lower δ 15 N.Therefore,the results gave a new way and reference to know of the grass balance of carbon gain and water cost and the nitrogen cycle in grassland.

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