不同生境胡杨叶片δ^13C和δ^15N及其对环境因子的响应  

Response of Leafδ^13C andδ^15N and Environmental Factors in Different Habitats of Populus euphratica

作　　者：哈丽古丽·艾尼 伊丽米努尔 管文轲[2] 阿不都热西提·热合曼 HALIGULI Aini;YILIMINUER;GUAN Wenke;ABUDOUREXITI Reheman(College of Life Sciences, Xinjiang Normal University, Urumqi 830054, China;Xinjiang Academy of Forestry Science, Urumqi 830063, China)

机构地区：[1]新疆师范大学生命科学学院,乌鲁木齐830054 [2]新疆林业科学院,乌鲁木齐830063

出　　处：《西北植物学报》2020年第6期1031-1042,共12页Acta Botanica Boreali-Occidentalia Sinica

基　　金：塔里木河胡杨保护科技支撑计划(2017)。

摘　　要：以新疆南北疆8个不同生境林龄群体的胡杨叶片为材料,测定幼树和成熟胡杨叶片的天然稳定碳、氮同位素组成值(δ^13C、δ^15N)以及碳含量、氮含量和比叶面积,分析叶片δ^13C、δ^15N值与海拔、经纬度、叶片碳氮含量、比叶面积以及水分利用效率之间的相互关系。结果表明:(1)胡杨幼树和成熟林叶片δ^13C平均值分别为-27.863‰(-28.776‰^-26.695‰)和-28.230‰(-29.717‰^-26.033‰),不同生境胡杨叶片间的δ^13C值具有显著差异(P<0.05),并且幼树林叶片δ^13C均大于对应成熟林;幼树和成熟林叶片δ^15N平均值分别为3.259‰(-1.842‰~9.082‰)和3.651‰(0.798‰~5.779‰)。(2)胡杨幼树和成熟林叶片碳含量平均值分别为46.225‰(44.573‰~49.056‰)和45.720‰(43.226‰~47.349‰),它们叶片氮含量平均值分别为1.708‰(1.327‰~2.116‰)和1.823‰(1.164‰~2.450‰);成熟林叶片碳含量与其δ^13C和δ^15N值分别呈极显著负相关和极显著正相关关系(P<0.01),而其氮含量与δ^13C值呈不显著正相关关系(P>0.05),与δ^15N值呈显著正相关关系。(3)胡杨幼树林叶片的比叶面积平均值(91.565 cm^2/g)小于成熟林叶片(103.141 cm^2/g)。(4)幼树和成熟林胡杨叶片δ^13C、δ^15N值均与纬度呈极显著正相关关系,幼树林叶片δ^13C、δ^15N值与海拔也呈极显著正相关关系,幼树林叶片δ^15N值与经度也呈显著正相关关系。(5)幼树和成熟胡杨林水分利用率的平均值分别为77.618μmol/mol(68.070~91.069μmol/mol)和72.463μmol/mol(62.809~97.111μmol/mol),不同林龄的胡杨水分利用率均与其叶片δ^13C呈极显著正相关关系(P<0.001),各生境中于田县(阿日系马扎)的幼树和成熟林叶片具有较高的δ^13C值(-26.695‰和-26.033‰)和水分利用效率(91.069和97.111μmol/mol)。Using the leaves of Populus euphratica forest age groups(young trees and mature trees)from eight different habitats in Xinjiang as material,we measured natural stable carbon and nitrogen isotope composition(δ^13C andδ^15N)value,carbon content,nitrogen content of leaves and specific leaf area,analyzed itsδ^13C andδ^15N values with altitude,latitude and longitude,leaf carbon and nitrogen contents,specific leaf area as well as the relationship between water use efficiency.The result showed that:(1)the averageδ^13C value of sapling and mature leaves was-27.863‰(-28.776‰--26.695‰)and-28.230‰(-29.717‰--26.033‰),respectively.δ^13C values of P.euphratica leaves in different habitats were significantly different(P<0.05),andδ^13C values of sapling leaves were all greater than those of mature trees.The averageδ^15N values of saplings and mature forest leaves were 3.259‰(-1.842‰-9.082‰)and 3.651‰(0.798‰-5.779‰),respectively.(2)The variation ranges of carbon content in leaves of saplings and mature forests were 44.573‰-49.056‰and 43.226‰-47.349‰,respectively,with an average values of 46.225‰and 45.720‰.The variation ranges of nitrogen content in young trees and mature forest leaves were 1.327‰-2.116‰and 1.164-2.450‰,respectively,with the average values of 1.708‰and 1.823‰.The content of carbon in mature forest leaves was negatively correlated with itsδ^13C value(P<0.01),while the content of nitrogen was positively correlated withδ^13C value(P>0.05).There was a significant positive correlation between carbon content andδ^15N value in mature forest leaves(P<0.01),while there was a significant positive correlation between nitrogen content andδ^15N value(P<0.05).(3)The average specific leaf area value of saplings(91.565 cm^2/g)was lower than that of mature trees(103.141 cm^2/g).(4)δ^13C andδ^15N values in leaves of young and mature trees were significantly positively correlated with latitude(P<0.01),δ^13C andδ^15N values in leaves of young trees were also significantly

关 键 词：胡杨 稳定碳氮同位素 环境因子 水分利用率 比叶面积 

分 类 号：Q948.11[生物学—植物学]