中文摘要：

对灵石山米槠林优势种不同叶龄叶绿体色素的差异以及优势种叶绿体色素沿海拔梯度的变化规律进行分析。结果表明：除少数优势种在某海拔梯度以外,不同叶龄叶绿素a、叶绿素b和叶绿素（a＋b）存在显著或极显著差异,一般在中高海拔梯度差异最大,且2年生叶片含量高于1年生叶片;而不同叶龄间叶绿素a/b和类胡萝卜素的差异性表现复杂,表现了植物对环境的适应。不同优势种叶绿素[叶绿素a、叶绿素b和叶绿素（a＋b）]在海拔梯度间存在显著差异,并且沿海拔梯度的变化呈现一定的规律性,米槠林优势种中有7种优势种不同叶龄叶绿素[叶绿素a、叶绿素b、叶绿素（a＋b）]含量均随海拔的升高先升高,一般在A5（442m）或A6（531m）达到最大值,然后随海拔的升高逐渐降低,而叶绿素a/b随海拔升高变化趋势比较多样化。类胡萝卜素作为功能色素由于其功能比较复杂,对海拔的响应规律也不尽相同。海拔作为重要的环境因素对于植物叶绿体色素产生显著影响,不同的优势种沿海拔的变化规律存在差异,说明其对环境的适应对策不同。

英文摘要：

Chloroplast pigment content is one of important indicators reflecting relationships between plants and environment.We investigated the variation of chloroplast pigments among leaves with various ages,and the change patterns of the leaf chloroplast pigments along elevation gradients.The leaves were selected from the dominant species in Castanopsis carlessi forests in the Lingshishan national forest park.The results showed that there were significant or very significant differences of chlorophyll a,chlorophyll b,and chlorophyll（a ＋ b）between various age leaves.Generally,the variations were more significant at middle elevation,followed by high elevation and then low elevation.The content of chlorophyll a,chlorophyll b,and chlorophyll（a ＋ b）in two-year old leaves was higher than in one-year-old leaves.However,the variation of chlorophyll a /b and carotenoid content between different age leaves was complicated,and it indicated the adaptation of plants to environment.There were significant variations of the chlorophyll a,chlorophyll b,and chlorophyll（a ＋ b）between different elevation gradients.With the increase of elevation gradients,the chlorophyll a,chlorophyll b,and chlorophyll（a ＋ b）content of seven species among the dominant species increased,reaching to a maximum at the elevation of A5 or A6 and then decreased.The change patterns of chlorophyll a /b were more diversified with the increase of elevation gradients.Carotenoid,as a type of functional pigment,has complicated functions,therefore,the response patterns to elevation were diversified too.The results of this research indicated that elevation,as an important environment factor,had vital and significant impacts on plants,and that the dominant species had different adaptation strategies.