外生菌根树木提高了中国东北部森林生态系统的持水能力

IF 2.6 2区 农林科学 Q1 FORESTRY
Lixin Jing, Yanbo Yang, Wenjie Wang, Huimei Wang
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引用次数: 0

摘要

提高持水功能是可持续森林管理的一个重要目的。然而,很少有研究探讨与不同菌根类型相关的树木所主导的森林之间的持水能力是否存在差异,以及导致差异的主要因素是什么。在此,我们调查了 210 块林地(10 m × 10 m)中土壤、枯落物和冠层截流的七项持水能力参数。这些地块被平均分为三种与菌根类型相关的森林类型,包括 AM 地块(丛生菌根树占 75%)、ECM 地块(外生菌根树占 75%)和 AM + ECM 地块(介于 25% 和 75% 之间)。我们计算了树木多样性(丰富度、香农-维纳指数、辛普森指数、均匀度)、群落结构(胸径、高度、枝下高度、密度、邻近比较-U、均匀角指数-W 和混合指数-M)和土壤物理(土壤容重和田间含水量)。结果表明(1) 以 ECM 为主导的群落比 AM 和 AM + ECM 群落的枯落物持水能力提高了 1.6-2.0 倍。ECM 群落的冠层截水量最高(0.97 毫米),明显高于 AM + ECM 群落(0.58 毫米)。(2)ECM 群落的田间土壤持水量较低(p < 0.05),但土壤非毛管水容量比 AM 和 AM + ECM 高 42-78% (p < 0.05)。(3) ECM 森林具有树种均匀度低、树体大、密度小的特点,有利于提高生态系统的持水量。此外,ECM 树种优势度的增加提高了群落结构对持水量变化的贡献。(4) ECM 树通过直接影响(主要是对枯落物的影响)和土壤物理(主要是对土壤的影响)或树木大小(主要是对树冠的影响)调节的间接影响,提高了生态系统的持水功能。这项研究强调了 ECM 树增强了持水能力,为温带水源涵养林的种植和管理提供了重要信息。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Ectomycorrhizal trees enhanced water-holding capacity in forest ecosystems in northeastern China

Ectomycorrhizal trees enhanced water-holding capacity in forest ecosystems in northeastern China

Improving water-holding functions is an important purpose of sustainable forest management. However, few studies have examined whether there are differences in water-holding capacities between the forests dominated by trees associated with different mycorrhizal types and what are the main factors leading to the differences. Here, we investigated seven parameters of water-holding capacities of soils, litter, and canopy interception in 210 forest plots (10 m × 10 m). The plots were equally divided into three forest types associated with mycorrhizal types, including AM plots (arbuscular mycorrhizal trees > 75% in dominance), ECM plots (ectomycorrhizal trees > 75%), and AM + ECM plots (between 25 and 75%). We calculated tree diversity (richness, Shannon–wiener index, Simpson index, evenness), community structure (diameter at breast height, height, under branch height, density, neighborhood comparison-U, uniform angle index-W, and mingling index-M), and soil physics (soil bulk density and field water content). The results showed that: (1) ECM-dominated communities increased 1.6–2.0-fold in the litter water-holding capacities than those of AM and AM + ECM. The canopy interception of the ECM community was the highest (0.97 mm), significantly higher than that of the AM + ECM community (0.58 mm). (2) The ECM community had lower field soil water-holding capacity (p < 0.05) but 42–78% higher soil non-capillary water capacity than that of AM and AM + ECM (p < 0.05). (3) ECM forests were characterized by low tree species evenness, big-sized trees, and low bulk density, favoring increasing ecosystem water-holding capacities. Moreover, increasing ECM tree dominance enhanced the contribution of community structure to water-holding variations. (4) ECM trees increased ecosystem water-holding functions by direct effects (mainly on the litter) and indirect effects from soil physics (mainly on the soils) or tree size (mainly on the canopy) regulations. This study highlighted that ECM trees enhanced water-holding capacity, providing important information for planting and managing temperate water conservation forests.

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来源期刊
CiteScore
5.10
自引率
3.60%
发文量
77
审稿时长
6-16 weeks
期刊介绍: The European Journal of Forest Research focuses on publishing innovative results of empirical or model-oriented studies which contribute to the development of broad principles underlying forest ecosystems, their functions and services. Papers which exclusively report methods, models, techniques or case studies are beyond the scope of the journal, while papers on studies at the molecular or cellular level will be considered where they address the relevance of their results to the understanding of ecosystem structure and function. Papers relating to forest operations and forest engineering will be considered if they are tailored within a forest ecosystem context.
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