Xiqin Forest Farm, Fujian Agriculture and Forestry University, Nanping 353000, Fujian, China.
School of Geographical Sciences, Fujian Normal University, Fuzhou 350117, China.
Ying Yong Sheng Tai Xue Bao. 2024 Jul 18;35(7):1771-1778. doi: 10.13287/j.1001-9332.202407.003.
Litter layer, serving as the "skin" of forest soil, plays a crucial role in conserving water resources and maintaining soil and water conservation. We analyzed the relationship of tree species richness, community weighted mean traits, and functional diversity with the standing mass, maximum water holding rate, and effective water sto-rage capacity of litters from various tree species including , , , , , , , and their combinations of mixed forests in subtropical region. The results showed that across various tree species combinations, the ranges of maximum water holding rate, standing litter mass and effective water storage capacity of undecomposed layer were 0-419%, 0-0.58 t·hm, and 0-1.66 t·hm, respectively. For the semi-decomposition layer, these values spanned in 0-375%, 0-6.14 t·hm, and 0-16.03 t·hm, respectively. Tree species richness and community weighted mean specific leaf area had significantly positive effects on standing mass of litter and effective water storage capacity, while community weighted mean leaf N content had significantly negative effect on standing mass of litter. The maximum water holding rate increased with the increases of functional diversity of specific leaf area and community weighted mean specific leaf area, decreased with the increase of community weighted mean leaf thickness. Results of structural equation model showed that tree species richness increased litter water holding capacity by increasing functional diversity of specific leaf area. The community weighted mean specific leaf area increased the water holding capacity of litter layer by increasing standing mass of litter and the maximum water holding rate. It is necessary to consider planting mixed forest with higher community weighted mean specific leaf area in the management of subtropical artificial forest, so as to improve the water holding capacity of litter layer.
凋落物层作为森林土壤的“皮肤”，在涵养水源和保持水土方面起着至关重要的作用。本研究分析了物种丰富度、群落加权平均性状和功能多样性与包括、、、、、、、和它们在亚热带混交林的不同树种凋落物的现存量、最大持水率和有效持水能力的关系。结果表明，在各种树种组合中，未分解层最大持水率、现存量和有效持水量的范围分别为 0-419%、0-0.58 t·hm 和 0-1.66 t·hm。对于半分解层，这些值分别在 0-375%、0-6.14 t·hm 和 0-16.03 t·hm 之间。物种丰富度和群落加权平均比叶面积对凋落物现存量和有效持水量有显著的正效应，而群落加权平均叶氮含量对凋落物现存量有显著的负效应。最大持水率随比叶面积和群落加权平均比叶面积功能多样性的增加而增加，随群落加权平均叶厚度的增加而减少。结构方程模型的结果表明，物种丰富度通过增加比叶面积功能多样性来增加凋落物持水能力。群落加权平均比叶面积通过增加凋落物现存量和最大持水率来增加凋落物层的持水能力。在亚热带人工林的管理中，有必要考虑种植具有较高群落加权平均比叶面积的混交林，以提高凋落物层的持水能力。
