摘要
叶片与细根是植物体地上和地下部分重要的营养器官，二者的化学计量学特征的关联性研究是探讨植物适应策略的重要方面。本研究对凉水国家级自然保护区天然阔叶红松林中34种常见植物叶片与不同根序级间氮含量、磷含量和氮磷比的差异性及相关性进行了研究。结果表明，氮、磷元素在不同器官中的含量有显著差异，且不同器官中的氮、磷元素具有一定的相关性；叶片的氮、磷含量和氮磷比高于细根，1～2级细根的氮、磷含量和氮磷比高于3～5级细根；植物叶片和各级细根的氮含量与其磷含量呈显著正相关，氮磷含量相关性高低顺序为：1～2级根〉叶片〉3～5级根；叶片与1～2级细根的氮含量、磷含量以及氮磷比均呈显著相关，叶片与3—5级根的氮含量呈显著相关；在不同生长型植物中，乔木、灌木和草本植物的叶氮、叶磷含量、叶氮磷比与不同级细根的氮、磷含量、氮磷比呈显著正相关。本研究阐明了植物叶片与不同根序级间氮磷化学计量学特征的相关性，有助于理解植物各性状之间的相互作用以及植物生长过程中对资源的利用和分配。
Leaves and fine roots are the important nutrition organs of aboveground and under- ground part of plants, respectively. Studies on the correlation of their stoichiometric characteris- tics are one of the most important aspects to explore adaptive strategy of plants. Nitrogen （N） and phosphorus （P） concentrations and N ： P stoichiometry of leaves and different order roots from 34 common plant species were studied in Liangshui National Nature Reserve Heilongjiang Province. The results showed that there were differences in N and P concentrations between different or- gans, and certain correlations existed between N and P concentrations in different organs. N and P concentrations and N：P were in the order of leaves 〉 1-2 order roots 〉 3-5 order roots. The order of the correlation of N and P concentration was 1-2 order roots 〉 leaves 〉 3-5 order roots. N concentration, P concentration and N：P ratio of leaves showed significantly positive correla- tions with those of 1-2 order roots, while only N concentration of leaves had a correlation with that of 3-5 order roots. In different life forms, N and P concentrations and N ： P ratio in leaves of trees, shrubs and herbs showed significant positive correlations with those of different order roots. The findings of this study demonstrated the relationship between the plant＇ s leaves and different order roots, providing insights into interactions among plant functional traits and plant strategy for resource acquisition and allocation during plant growth.
出处
《生态学杂志》
CAS
CSCD
北大核心
2015年第12期3283-3288,共6页
Chinese Journal of Ecology
基金
国家"十二五"科技支撑计划项目(2012BAC01B03)资助
关键词
天然阔叶红松林
叶氮含量
叶磷含量
细根氮含量
细根磷含量
氮磷比
natural broadleaved Korean pine forest
leaf N concentration
leaf P concentration
fine root N concentration
fine root P concentration
N：P ratio.
