森林疏伐后细根分解的变异性:采伐强度和根系大小的影响

IF 2.6 2区 农林科学 Q1 FORESTRY
Dong Wang, Mathias Neumann, Mathias Mayer, Douglas L. Godbold, Hangyu Lan, Xinli Chen, Qingwei Guan
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引用次数: 0

摘要

细根分解是森林碳(C)和养分循环的重要驱动力。采伐作业可能会通过改变根系特性和环境条件来影响细根分解率,但我们对根系动态的了解还很有限。在这项研究中,我们利用两种根系大小等级(< 直径 1 毫米和 1-2 毫米),调查了一个 26 年树龄的中国冷杉人工林在低强度和高强度疏伐(30% 和 70% 的树木砍伐)七年后细根腐烂的化学性质、质量损失、元素释放(碳、氮和磷)以及化合物释放(木质素和纤维素)。低强度疏伐(LIT)并不影响细根等级的质量损失,也不影响细根元素或化合物在分解过程中的释放。同样,高强度疏伐(HIT)对大型细根的分解也没有影响。然而,与低强度疏伐和不疏伐相比,高强度疏伐降低了小细根的腐烂率以及木质素和纤维素的损失。这种减少与根木纤维素指数(木质素/[木质素 + 纤维素])的增加和土壤转化酶活性的降低有关。有趣的是,稀植并不影响分解过程中根部 C、N 或 P 的损失。总之,我们的研究结果表明,在研究人工林中细根的动态时,应考虑疏伐强度以及根的大小和化学性质。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Variability in fine root decomposition after forest thinning: effects of harvest intensity and root size

Variability in fine root decomposition after forest thinning: effects of harvest intensity and root size

Fine root decomposition is an important driver of forest carbon (C) and nutrient cycling. Harvesting operations may affect fine root decomposition rates by altering root properties and environmental conditions, but our understanding of root dynamics is limited. In this study, we investigated the chemistry, mass loss, element release (C, nitrogen (N), and phosphorus (P)), and compound release (lignin and cellulose) of decaying fine roots in a 26 year-old Chinese fir plantation seven years after low- and high-intensity thinning (30% and 70% tree removal) using two root size classes (< 1 mm and 1–2 mm diameter). Low-intensity thinning (LIT) did not affect mass loss in either fine root class or the release of fine root elements or compounds during decomposition. Similarly, high-intensity thinning (HIT) had no effect on the decomposition of large fine roots. However, compared with LIT and no thinning, HIT reduced the decay rates and lignin and cellulose losses of small fine roots. This reduction was related to an increase in the root lignocellulose index (lignin/[lignin + cellulose]) and a decrease in soil invertase activity. Interestingly, thinning did not affect root C, N, or P loss during decomposition. In summary, our results suggest that thinning intensity as well as root size and chemistry should be considered when studying fine root dynamics in managed 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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