摘要
以内蒙古中东部草原分布的克氏针茅和大针茅为研究对象,对不同生境和相同生境下二者的叶性特征进行了分析研究.结果表明:在不同生境下,从典型草原西部边缘到典型草原东部,贫瘠生境中克氏针茅和大针茅采取单位面积高氮含量的生存策略、相对肥沃生境中的克氏针茅和大针茅则采取单位面积低氮含量的生存策略,二者比叶面积的变化趋势均与生境中前期获得的实际降雨量变化趋势一致,即生境中前期获得的实际降雨量高则比叶面积相对较高;在相同生境下,克氏针茅采取高比叶面积、低单位面积氮含量的生存适应策略,大针茅采取低比叶面积、高单位面积氮含量的生存适应策略.
Three populations of Stipa krylovii Roshev.in July and four populations of it in August,three populations of S.grandis P.Smirn.collected from Mandulatu,Xinhot,West Xilinhot,East Xilinhot,Bayanwula,were used for the study of their leaf traits.From the western margin of the typical steppe in Inner Mongolia to the eastern of it,S.grandis and S.krylovii had high area-based leaf nitrogen content in poor habitats,and in less poor habitats S.grandis and S.krylovii had low area-based leaf nitrogen content.And the specific leaf area（SLA） of S.grandis and S.krylovii changed with the early actual precipitation of their habitats,that is to say,high early precipitation in the habitat lead to relatively high SLA.While in the same habitats,S.krylovii had high SLA and low Narea,at the same time S.grandis had low SLA and high Narea.Obviously,they took very different survival mode in both SLA and Narea in order to adapted environments.
出处
《天津师范大学学报（自然科学版）》
CAS
北大核心
2010年第1期57-63,共7页
Journal of Tianjin Normal University：Natural Science Edition
基金
国家重点基础研究发展规划项目(2007CB106802)
天津市科技发展计划项目(06YFSZSF05100)
国家自然基金项目(40803002)
天津市科技计划重点项目(09JCZDJC25900)
天津市科技计划一般项目(09JCYBJC07900)
关键词
克氏针茅
大针茅
比叶面积
单位面积氮含量
单位重量氮含量
Stipa krylovii Roshev.
S.grandis P.Smirn.
specific leaf area（SLA）
area based leaf nitrogen concentrations（Narea）
mass based lesa nitrogen concentrations（Nmass）
