林型和地形因子对太岳山森林地表凋落物矿质元素含量的影响

发布时间：2019-04-16 08:58

【摘要】：森林地表凋落物是树木生长所需矿质养分的重要储库,探索森林凋落物矿质元素对环境因子变化的响应,有助于进一步了解植物—凋落物—土壤的反馈机制.本研究选择涵盖整个太岳山的9个不同海拔梯度,采样收集森林地表凋落物并同时记录环境因子特征,经实验室分析测定样品中的6种重要矿质元素,包括磷(P)、硫(S)、钾(K)、钙(Ca)、镁(Mg)、铁(Fe)的质量分数,并分析林型和地形因子(海拔、坡度和坡向)对凋落物矿质元素的影响.结果表明,坡向是凋落物S质量分数的主要影响因子,并单独解释了S质量分数变异的40%;凋落物P和Ca质量分数变异主要是由林型、海拔和二者的交互作用造成的;然而,林型和地形因子对凋落物中K、Mg、Fe没有显著影响.这些差别反映了矿质元素受植物生理调节及其在凋落物中固持能力的差异性.研究结果可为森林生态系统矿质养分循环建模提供借鉴.
[Abstract]:Litter on the surface of forest is an important reservoir of mineral nutrients for tree growth. Exploring the response of mineral elements of forest litter to environmental factors is helpful to understand the feedback mechanism of plant-litter-soil. In this study, nine different elevation gradients covering the whole Taiyue Mountain were selected to sample and collect forest surface litter and record the characteristics of environmental factors at the same time. Six important mineral elements, including phosphorus (P), were determined by laboratory analysis. The contents of sulfur (S), potassium (K), calcium (Ca), magnesium, iron (Fe) and the effects of forest type and terrain factors (elevation, slope and slope direction) on the mineral elements of litter were analyzed. The results showed that slope direction was the main influencing factor of S mass fraction of litter and explained 40% of the variation of S mass fraction alone. The variation of P and Ca mass fraction of litter was mainly caused by forest type, altitude and interaction between them. However, forest type and topographical factors had no significant effect on K, mg, Fe in litter. These differences reflect the differences in plant physiological regulation of mineral elements and their retention in litter. The results can be used as reference for the modeling of mineral nutrient cycle in forest ecosystem.
【作者单位】：北京师范大学地表过程与资源生态国家重点实验室;北京师范大学地理科学学部资源学院;北京师范大学生命科学学院;
【基金】：国家自然科学基金资助项目(41271059) 国家科技基础性工作专项资助项目(2011FY110300)
【分类号】：S714

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