土壤水分状况对长白山阔叶红松林主要树种叶片生理生态特性的影响

现在水资源缺乏已成为全球性问题 ,对植物产生极大的影响 ,水分亏缺影响植物的整个生长过程 ,不论是外部形态还是内部结构以及各种代谢过程均受到影响。一般认为 ,植物的不同程度水分亏缺都对其生长不利 ,但也有的研究表明 ,适度的水分亏缺能促进植物的生长13 ,15] ,这主要是由于不同植物在不同程度水分亏缺条件下碳同化与水分利用机制间存在差异的结果6,7,14 ] 。本研究以温带典型森林类型阔叶红松林主要树种为研究对象 ,通过观察不同树种光合能力、水分利用率等生理生态特性对不同土壤水分条件响应程度和耐干旱程度 ,为进一步分析未来气…

Effect of Soil Moisture Status on Some Eco-Physiological Indexes of Dominant Tree Species in the Pine Broadleaf Forest of Changbai Mountain

Potted seadlings of Pinus koraiensis,Fraxinus mandshurica,Juglans mandshurica,Tilia amurensis,and Quercus mongolica,which are five dominant species in the Korean pine broadleaf forest at Changbai mountain,were grown in different soil moistures.We designed three soil moisture scenarios:85%～100%(high water,CK),65%～85% (medium water,MW) and 45%～65% .(low water,LW) of field water-holding capacity.The results show that characteristics of typical drought-resistance on the leaves are significantly developed.The net photosynthetic rate and water use efficiency of F. Mandshurica were higher compared with CK at MW.The net photosynthetic rate and water use efficiency of other 4 tree species at CK were lower than those at MW and LW.The transpiration rate of 5 tree species responses differently to various soil water status.