中文摘要：

以延河流域3个植被区（森林区、森林草原区及典型草原区）稳定的自然植物群落中的铁杆蒿为研究对象,测定铁杆蒿的比叶面积、叶组织密度、叶氮含量、叶磷含量、叶氮磷比、比根长、细根组织密度、细根氮含量、细根磷含量、细根氮磷比10项能够反映植物生存对策且易于测量的功能性状,研究了不同生境下铁杆蒿功能性状的种内差异,以及气象因子和地形因子对铁杆蒿植物功能性状的影响,并分析了各功能性状间的相关关系.结果表明：铁杆蒿各功能性状中除了叶磷含量、叶氮磷比、比根长、根组织密度和根氮磷比在各植被带间的差异显著外,其他5个性状差异均不显著.各性状在坡度、坡向间的差异不显著.比叶面积与叶组织密度呈显著负相关,比根长与根组织密度和根氮磷比呈显著负相关,根组织密度与根氮含量和根氮磷比呈显著正相关,叶组织密度、叶氮含量和叶氮磷比与其他功能性状的相关性不显著.表明铁杆蒿对恶劣环境的适应是通过叶片和细根功能性状间的相互作用和调节实现的.不同环境因素在不同程度上对铁杆蒿功能性状产生影响,对铁杆蒿功能性状影响大小依次是年均降雨量、年均温和年均蒸发量.

英文摘要：

The paper focused on Artemisia sacrorum in the stable natural plant community in three vegetation zones （forest, forest steppe and steppe） in the Yanhe River catchment. The following plant functional traits were measured at each sample site, i.e., specific leaf area （ SLA）, leaf tissue density （ LTD）, leaf nitrogen concentration （ LNC ）, leaf phosphorus concentration （ LPC）, leaf ni- trogen phosphorus ratio （LNP）, specific root length （SRL）, root tissue density （RTD）, root nitro- gen concentration （RNC）, root phosphorus concentration （RPC） and root nitrogen phosphorus ratio （RNP）. These 10 plant functional traits adequately reflected plant survival strategies. were chosen because they were easily measurable and We analyzed intraspecific differences in A. sacrorum functional traits in the different habitat zones, and the influence of climate and terrain factors on A. sacrorum functional traits. We also studied the relationships among A. sacrorum plant functional traits. The results showed that some A. sacrorum functional traits were significantly different among sample sites, such as LPC, LNP, SRL, RTD and RNP, while the other 5 functional traits had no significant differences. The functional traits were not significantly different between sites with diffe- rent slopes and aspects. SLA was very significantly negatively correlated with LTD, SRL was signifi- cantly negatively correlated with RTD and RNP, RTD was significantly positively correlated with RNC and RNP, and there were no significant relationships among LTD, LNC and LNP and the oth- er functional traits. This showed that A. sacrorum adapted to the environment by coordinating adjust- ment among leaf and root functional traits. Different climate factors had different effects on plant traits, with the effects of mean annual precipitation 〉 mean annual temperature 〉 annual average evaporation capacity.