论文部分内容阅读
选取甘肃、宁夏及内蒙古油松(Pinus tabulaeformis)10个天然种群,通过测定油松叶片稳定碳同位素组成(δ13C)和元素含量等特征,分析了油松叶片δ13C特征及其与环境气候因子和叶片矿质元素含量之间的关系。研究结果表明,油松叶片δ13C的变化范围在–28.68‰––25.02‰之间,平均值为–26.82‰;油松叶片δ13C值与海拔、经度之间相关性不显著,与纬度之间呈显著正相关,与年降水量、年平均温度之间均呈显著负相关,说明年平均温度和年降水量是决定油松13C分馏能力差别及生长的主要限制因子;叶片元素N、P、K、Si、Ca、Fe含量与δ13C值有明显的相关性,其中叶片N、P、K含量与δ13C值显著负相关,Si、Ca、Fe含量与δ13C值显著正相关,可见不同种群间δ13C组成差异可反映植物营养元素含量的变化状况。不同生境条件下环境气候因子和矿质元素含量的这种响应模式在一定程度上反映和影响了以油松为建群种和优势种的生态系统的δ13C变化特性。
Ten natural populations of Pinus tabulaeformis from Gansu, Ningxia and Inner Mongolia were selected to analyze the δ13C characteristics of Pinus tabulaeformis leaves and its relationship with climatic factors and leaves by measuring the stable carbon isotope composition (δ13C) and elemental content of Pinus tabulaeformis. The relationship between mineral elements content. The results showed that the δ13C ranged from -28.68 ‰ to 25.02 ‰ for Pinus tabulaeformis and the average value was -26.82 ‰. The δ13C value of Pinus tabulaeformis leaf had no significant correlation with altitude and longitude, but the latitude There was a significant negative correlation between annual precipitation and annual average temperature, indicating that annual mean temperature and annual precipitation are the main limiting factors that determine the difference in 13C fractionation ability and growth of Pinus tabulaeformis. N, P, K , And the contents of Si, Ca and Fe were significantly correlated with the δ13C values. The contents of N, P and K in leaves were significantly negatively correlated with δ13C values, while the contents of Si, Ca and Fe were positively correlated with δ13C values. The differences can reflect the changes of plant nutrient elements. This response pattern of environmental climatic factors and mineral elements content in different habitats reflects and affects the δ13C variation of ecosystem of Pinus tabulaeformis, a dominant species and species, to a certain extent.