Effects of permafrost collapse on soil carbon, nitrogen, and metal elements on the Qinghai-Tibet Plateau

IF 5.4 1区农林科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Catena Pub Date : 2024-09-30 DOI:10.1016/j.catena.2024.108425

Wenjuan Wang , Evgeny Abakumov , Xiaodong Wu , Jie Chen , Gensheng Li , Dong Wang , Haiyan Xu , Guimin Liu , Sizhong Yang , Vyacheslav Polyakov , Timur Nizamutdinov , Xiaowen Ji

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Abstract

Permafrost degradation can lead to the decomposition of organic matter and the remobilization of metal elements (MEs). However, the changes in MEs, as well as the relationships between soil organic carbon (SOC), total nitrogen (TN), and MEs in permafrost collapse areas remain unknown. Here, we investigated the changes in SOC, TN, and MEs and their driving factors in three stages (control, drape, and exposed) of four thermokarst sites on the Qinghai-Tibet Plateau (QTP). The results revealed that SOC and TN decreased by 20–30% and 11–17% from control to drape areas, respectively. The concentrations of Fe, Mn, Zn, Cr, Ni, Cu, Pb, and Cd declined by 3.11% to 45.07% from drape to exposed areas. Furthermore, soil water content, bulk density, and pH were correlated with SOC and TN. Soil inorganic carbon (SIC) and pH regulated the connection of SOC and TN with MEs. Our results suggest that permafrost collapse changes SOC, TN, and MEs, and also indirectly strengthens the relationship of SOC and TN with MEs via SIC and pH, which might be a critical mechanism for SOC and TN pools in thermokarst-affected terrains.

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冻土崩塌对青藏高原土壤碳、氮和金属元素的影响

永冻土降解可导致有机物分解和金属元素（MEs）的再流动。然而，永冻土塌陷区金属元素的变化以及土壤有机碳（SOC）、全氮（TN）和金属元素之间的关系仍然未知。在此，我们研究了青藏高原（QTP）四个温冻区三个阶段（对照、垂悬和裸露）的土壤有机碳（SOC）、全氮（TN）和MEs的变化及其驱动因素。结果表明，从对照区到悬垂区，SOC和TN分别下降了20-30%和11-17%。从悬垂区到裸露区，铁、锰、锌、铬、镍、铜、铅和镉的浓度分别下降了 3.11% 到 45.07%。此外，土壤含水量、容重和 pH 值与 SOC 和 TN 相关。土壤无机碳（SIC）和 pH 值调节着 SOC 和 TN 与 ME 的关系。我们的研究结果表明，永久冻土塌陷改变了SOC、TN和MEs，并通过SIC和pH间接加强了SOC和TN与MEs的关系，这可能是受热卡斯特影响的地形中SOC和TN池的一个关键机制。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Catena 环境科学-地球科学综合

CiteScore

10.50

自引率

9.70%

发文量

816

审稿时长

54 days

期刊介绍： Catena publishes papers describing original field and laboratory investigations and reviews on geoecology and landscape evolution with emphasis on interdisciplinary aspects of soil science, hydrology and geomorphology. It aims to disseminate new knowledge and foster better understanding of the physical environment, of evolutionary sequences that have resulted in past and current landscapes, and of the natural processes that are likely to determine the fate of our terrestrial environment. Papers within any one of the above topics are welcome provided they are of sufficiently wide interest and relevance.