矮矮林种子凋落与落叶凋落的关系:收获后随保留水平和年数的变化

IF 2.1 3区 农林科学 Q2 FORESTRY Trees Pub Date : 2022-11-24 DOI:10.1007/s00468-022-02365-2
Julián Rodríguez-Souilla, María V. Lencinas, Juan M. Cellini, Jimena E. Chaves, Fidel A. Roig, Pablo L. Peri, Guillermo J. Martínez Pastur
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引用次数: 1

摘要

关键信息:在未收获地区,种子下降和凋落叶产量通过源库限制关系联系在一起。这些关系的大小根据收获后几年的保留水平而有所不同。摘要种子落落和凋落叶影响着森林更新、养分循环等与森林经营密切相关的关键生态过程。在巴塔哥尼亚森林,经管森林和非经管森林多年来的变化都可能影响其复原力,而采伐对可持续性的影响尚未得到充分了解。目的是在中期分析可变保留采伐和无管理的矮矮林中种子落差和凋落叶的关系。在采收后数年测量了原始林的种子产量(S)和凋落叶(LL)以及三种保留类型。根据S和LL的基底面积计算SI、LLI两个指标。由于采伐,森林结构在不同的保留率水平之间有所不同。人工林的种子产量和凋落叶数量均有所下降,但在SI比较中未发现统计学差异。此外,收获区LLI较高。森林采伐的LLI值逐渐高于YAH值,但SI值保持不变。在所有森林类型中,低SI年份的LLI值都较高,这可能与源汇限制关系有关。最后,在SI值相近的情况下,人工林提供了更高的LLI值,这主要是由非人工林贡献的。种子的掉落和凋落叶的产量在收获后的中期证实了变化。这些发现对于调整森林管理做法以及理解生态系统服务提供的调节和支持具有重要意义。
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Seed fall and leaf litter relationships in Nothofagus pumilio forests: changes according to retention levels and years after harvesting

Key Message

Seed fall and leaf litter production are linked by a source–sink limitation relationship in unharvested areas. The magnitude of these relationships varied differently according to the retention levels over the years-after-harvesting.

Abstract

Seed fall and leaf litter influence forest regeneration, nutrient cycling, and other key ecological processes closely related to forest management. In Patagonian forests, variation of both managed and unmanaged forests over the years can influence their resilience, where the sustainability implications of harvesting are not fully understood. The aim was to analyse the relationship between seed fall and leaf litter in variable retention harvesting and unmanaged Nothofagus pumilio forests in the medium term. Seed production (S) and leaf litter (LL) in primary unmanaged forests and three retention types were measured over the years after harvesting (YAH). Two indexes (SI, LLI) were calculated based on basal area for both S and LL. Due to harvesting, forest structure varied between retention levels. Both seed production and leaf litter decreased in managed forests, but statistical differences were not found when comparing SI. In addition, LLI was higher in the harvested areas. Forest harvesting progressively showed an increase in LLI values over the YAH, but SI maintained similar values. For all forest types, LLI presented higher values for years with low SI, and this could be linked with a source–sink limitation relationship. Finally, managed forests provide higher values of LLI for similar values of SI, contributed mainly by unmanaged areas. Seed fall and leaf litter production evidenced alterations in the medium term after harvesting. These findings have important implications for the adjustment of forest management practices, and for the understanding of the regulation and support of ecosystem service provision.

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来源期刊
Trees
Trees 农林科学-林学
CiteScore
4.50
自引率
4.30%
发文量
113
审稿时长
3.8 months
期刊介绍: Trees - Structure and Function publishes original articles on the physiology, biochemistry, functional anatomy, structure and ecology of trees and other woody plants. Also presented are articles concerned with pathology and technological problems, when they contribute to the basic understanding of structure and function of trees. In addition to original articles and short communications, the journal publishes reviews on selected topics concerning the structure and function of trees.
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