横断山脉海拔梯度上森林类型主导调控的土壤溶解性有机质动态变化

doi:10.1093/jpe/rtaf087

Journal of Plant Ecology ›› 2025, Vol. 18 ›› Issue (5): 1-45.DOI: 10.1093/jpe/rtaf087

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横断山脉海拔梯度上森林类型主导调控的土壤溶解性有机质动态变化

收稿日期:2024-12-08 接受日期:2025-05-22 出版日期:2025-10-01 发布日期:2025-09-15

Forest types predominantly regulate soil-dissolved organic matter dynamics along an elevational gradient in the Hengduan Mountains

Yong Bao¹, Xiuxian Men¹, Chang Liao¹, Deping Zhai¹, Jinsheng Li³, Yiyue Wang¹, Chi Wang^1,2, Xiaoli Cheng^1,2*

¹State Key Laboratory for Vegetation Structure, Functions and Construction and Ministry of Education Key Laboratory for Transboundary Ecosecurity of Southwest China and Key Laboratory of Soil Ecology and Health in Universities of Yunnan Province, School of Ecology and Environmental Sciences, Yunnan University, Kunming 650500, China, ²Yunnan Key Laboratory of Soil Erosion Prevention and Green Development, Institute of International Rivers and Eco-security, Yunnan University, Kunming 650091, China, ³School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China

*Corresponding author. E-mail: xlcheng@ynu.edu.cn

Received:2024-12-08 Accepted:2025-05-22 Online:2025-10-01 Published:2025-09-15
Supported by:
This research was financially supported by the National Natural Science Foundation of China (32130069), the Special Project for Social Development of Yunnan Province (202103AC100001), the Major Program for Basic Research Project of Yunnan Province (202101BC070002) and the Scientific Research Foundation of Education Department of Yunnan Province (2024Y004).

摘要/Abstract

摘要： 土壤溶解性有机质(DOM)在陆地生态系统碳(C)循环中至关重要。然而，森林类型和海拔对山地生态系统土壤DOM动态的调控效应尚未完全明晰。本研究在横断山脉海拔梯度(2600–3500 m)上，系统研究了土壤DOM含量、光谱特征、分子特性及其潜在驱动因子。结果表明，阔叶林土壤(2900和3500 m)的溶解性有机碳(DOC)含量均显著高于针叶林土壤(2600和3200 m)，且湿季DOM含量普遍高于干季。腐殖化指数(HIX)与DOC含量变化趋势一致，而芳香性指数(AI)则呈相反趋势，这些模式与凋落物碳源质量密切相关。DOM的分子水平分析表明，木质素类结构化合物和单宁是土壤DOM的主要成分，表明研究区土壤DOM的分子组成具有典型的植物源特征。此外，干季期间，木质素化合物的相对丰度随海拔升高逐渐降低。干季土壤DOM动态主要受土壤性质(尤其是NH₄⁺-N含量)的调控，而湿季则主要受凋落物特性(如叶DOC含量)影响。总体而言，本研究揭示了凋落物特性和土壤性质主导调控了沿海拔梯度的土壤DOM的变化机制，表明在未来气候变化背景下，高山生态系统土壤DOM动态可能因树种差异而对土壤碳固存产生差异性影响。

关键词: 高山森林, 气候, 植被类型, 凋落物特性, 土壤碳动态

Abstract: Soil dissolved organic matter (DOM) is vital in terrestrial ecosystem carbon (C) cycling; however, the regulatory effects of forest types and elevations on soil DOM dynamics in mountain ecosystems remain incompletely understood. Here, we investigated DOM content, spectroscopic characteristics, molecular traits and their potential drivers along an elevational gradient (2600-3500 m) in the Hengduan Mountains. Our results showed that soil dissolved organic C (DOC) content was higher in broad-leaf forest soil (at 2900 m and 3500 m) than in coniferous forest soil (at 2600 m and 3200 m) irrespective of elevation, with a greater amount in wet season than in dry season. Humification index (HIX) trends aligned with the DOC content, while the aromaticity index (AI) showed an inverse relationship. These patterns were linked to the quality of litter carbon sources. Molecular-level analysis of DOM suggested that lignins/CRAM-like structure compounds and tannins predominated in soil DOM, indicating that the molecular composition of soil DOM was typical of plant-derived sources in our study region. Additionally, the relative abundance of lignin compounds decreased gradually with increasing elevation during the dry season. We detected that soil properties (especially, NH₄⁺-N content) predominantly mediated DOM dynamics in dry season, whereas litter traits (i.e., leaf-DOC content) were the key factors across elevations in wet season. Overall, our results revealed litter traits and soil properties predominantly regulated soil DOM mechanism along elevational gradient, indicating that soil DOM dynamics associated with tree species in alpine mountain ecosystems may differentially influence soil C sequestration under future climate change scenarios.

Key words: alpine forest, climates, vegetation types, litter traits, soil carbon dynamics

. 横断山脉海拔梯度上森林类型主导调控的土壤溶解性有机质动态变化[J]. Journal of Plant Ecology, 2025, 18(5): 1-45.

Yong Bao, Xiuxian Men, Chang Liao, Deping Zhai, Jinsheng Li, Yiyue Wang, Chi Wang, Xiaoli Cheng. Forest types predominantly regulate soil-dissolved organic matter dynamics along an elevational gradient in the Hengduan Mountains[J]. J Plant Ecol, 2025, 18(5): 1-45.

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横断山脉海拔梯度上森林类型主导调控的土壤溶解性有机质动态变化

Forest types predominantly regulate soil-dissolved organic matter dynamics along an elevational gradient in the Hengduan Mountains

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