东灵山地区辽东栎叶性状与地形因子关系

Leaf traits of Quercus wutaishanica and their relationship with topographic factors in Mount Dongling

地形特征通过光照、温度和降水等生态因子的再分配间接影响树木的生长。以北京东灵山南坡地区辽东栎（Quercuswutaishanica）为对象，通过地形因子调查，辽东栎叶片取样、称重、扫描和图像处理，相关性分析以及灰色关联度分析等，研究其比叶面积（SLA）、叶干物质含量（LDMC）等结构性状在地形因子影响下的变化。结果表明：辽东栎sLA、LDMC、叶密度（LD）等叶性状之间具相关关系；叶面积（LS）、鲜重（LFw）和干重（LDW）随海拔升高呈先下降后上升的二次曲线变化特征，最小值均出现在海拔1400～1600133；SLA和LDMC随海拔的变化趋势在山谷和山脊地区不同，且能够通过山谷和山脊局地不同的水分情况加以解释；LS、LDW、LFw在阴坡和阳坡间存在显著差异；海拔是影响SLA、LDMC的首要地形因子，而坡向是影响LS、LDW和LFW的首要地形因子。

Topographic features often play a role in redistributing the ecological factors such as light, temperature, rainfall and so on, thus altering the tree growth. Leaf samples of Qttercus wutaishanica were collected and topographical factors were investigated in the southern slope of Mount （ LDM those Pongling, to study the tree species＇ specific leaf area （SLA）, leaf dry matter content C） and some other traits in leaf structure, aiming to examine the adaptive responses of traits to variable topographic factors. Significant correlations were found among SLA, LDMC, leaf density （LD）. The leaf traits, such as leaf size （ LS）, leaf fresh weight （LFW） and leaf dry weight （ LDW）, decreased at first and then increased with increasing the altitude, pre- senting a quadratic trend, with the minimums occurring at the elevation of 1400-1600 m. The re- lationship between the leaf traits （ SLA, LDMC） and the altitude in the valley was different from that in the ridge, which could be explained by the different local water regimes resulted from the topographic change of valley-to-ridge locations. LS, LFW and LDW differentiated significantly from sunny to shady slope exposures. Altitude was the primary factor influencing SLA, LDMC, whereas slope aspect dominated the shaping of LS, LDW and LFW.