摘要
植物功能性状由生境条件和遗传因素共同决定,田间控制实验能够揭示植物功能性状在种内和种间的变异程度。采集南北样带温带区8个地点6种栎属树种的种子,通过田间栽培试验,以均一环境下1年生幼苗为对象,研究比较种内及种间比叶重、单位叶面积光合速率、单位叶重量光合速率、总干物质含量和根冠比5种功能性状的变化差异,并且分析幼苗功能性状与种子性状的关系。结果发现:栎属树种种间幼苗的功能性状变异系数高于种内,并且种内功能性状的差异较小,种间差异性较大,而比叶重和叶片光合速率无论在种间还是种内,其变异率都较小;总干物质量和根冠比与种子质量显著相关,随种子质量增加幼苗的总干物质量和根冠比呈现增加的趋势,比叶重和叶片光合速率与种子质量的相关性较小。
The differences in functional traits among species may be the result of both genetic differences and plas-ticity if species are measured in different environments. Common garden experiments can help determine the extent to which trait differences observed among species are genetic induced. Seeds of 6 Quercus species from 8 core distri-bution areas in temperate zone of North-South Transect of Eastern China（NSTEC） were pretreated and sown in the same environment. 5 functional traits of one year-old seedlings were measured, i. e. , leaf mass per area （LMA）, photosynthetic rate per unit leaf area （A ）, photosynthetic rate per unit leaf mass （A ）, total dry matter content （ TDMC）, and root-shoot ratio （RSR）. The difference and overall variation of different functional traits among intra-species and inter-species were analyzed, and the relationships between functional traits of seedlings and seed mass were discussed. The results show that： the interspecific variation coefficients of all functional traits were higher than intraspecific variation coefficient, and the interspeeies differences of functional traits were also more significant, while variation of LMA and leaf photosynthetic rate were lower whatever among intra-species or inter-species; two functional traits （ TDMC, RSR） were obvious correlated with seed mass, while the relationships of leaf photosynthetic rate and LMA with seed mass were relatively lower. It could explain that in temperate zone of NSTEC, the change of functional traits of Quercus species partly were the expression of difference among species affected by genetic evolution, so when studying the relationship among Quercus species and environment, the interspecies variation of functional traits can-not be neglected, and LMA could serve as a better index, and leaf photosynthetic rate take the second place.
出处
《林业科学研究》
CSCD
北大核心
2013年第2期156-162,共7页
Forest Research
基金
林业公益性行业科研专项(200804001)
国家自然科学基金重大项目(30590383)
国家自然科学基金面上项目(30771718)
