Plateau zokor mounds decrease soil respiration by shifting microenvironment

IF 5.4 1区农林科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Catena Pub Date : 2025-06-12 DOI:10.1016/j.catena.2025.109234

Fanglong Su , Fuwei Wang , Donghui Li , Yueqing Xu , Zhongling Yang , Yue Du , Renhui Miao

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引用次数: 0

Abstract

The mound-building activity of plateau zokor is a common disturbance to alpine meadow on the Tibetan Plateau, which greatly impacts ecosystem processes and threatens ecosystem stability. However, the effects of zokor mounds on soil respiration (SR) and the underlying mechanisms are still unclear. Here, we conducted an in-situ experiment to learn about the effects of new and old zokor mounds on SR in an alpine meadow on the Tibetan Plateau. The results showed that both new and old zokor mounds significantly decreased SR, and SR in new mounds was significantly lower than that in old mounds. Structural equation modeling showed that the negative effects of zokor mounds on SR were caused by soil moisture (SM) and soil microbial biomass carbon (MBC). Since SM and MBC will still be negatively affected by the mounds due to their microtopography, the findings not only showed that SR in soil mounds was significantly decreased during the plant recovery but also suggested that zokor mounds might still negatively affect SR for a long period after recovery. This study revealed the effects of zokor mounds on SR and soil biotic/abiotic factors, highlighted the importance of SM and soil microbes in regulating SR in zokor mounds, and provided a basis for estimating the impact of plateau zokors on grassland carbon cycling.

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高原动物丘通过改变微环境降低土壤呼吸

高原鼢鼠造丘活动是青藏高原高寒草甸常见的干扰因素，严重影响了生态系统过程，威胁了生态系统的稳定。然而，草堆对土壤呼吸的影响及其机制尚不清楚。本文通过原位实验研究了青藏高原高寒草甸新旧草丘对SR的影响。结果表明：新、旧草甸的SR均显著降低，新草甸的SR显著低于旧草甸；结构方程模型分析表明，草甸土堆对土壤水分（SM）和土壤微生物生物量碳（MBC）的负影响是由土壤水分（SM）和土壤微生物生物量碳（MBC）引起的。由于土壤微地形的原因，SM和MBC仍会受到土丘的负面影响，因此研究结果不仅表明土丘的SR在植物恢复过程中显著降低，而且表明在恢复后的很长一段时间内，动物丘仍可能对SR产生负面影响。本研究揭示了草甸对SR和土壤生物/非生物因子的影响，强调了SM和土壤微生物在草甸SR调节中的重要性，为估计高原草甸对草地碳循环的影响提供了依据。

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.