植被类型和干旱性调节土壤有机碳组分在塑造旱地生态系统服务中的作用

IF 6.6 1区 农林科学 Q1 SOIL SCIENCE
Luna McGill , Pablo García-Palacios , Fernando T. Maestre , Manuel Delgado-Baquerizo , César Plaza
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引用次数: 0

摘要

土壤有机碳(SOC)支持旱地多种生态系统服务。然而,有机碳的两个主要组分-颗粒有机碳(POC)和矿物相关有机碳(MAOC)-对生态系统服务的影响,以及植被类型和干旱程度是否决定了这种关系,仍有待探索。本文利用全球251个旱地生态系统数据库,评估了POC和MAOC含量与7个生态系统服务功能(生物量生产、养分循环、害虫防治、共生、碳储存、水分调节和有机质分解)的关系。我们发现,除了共生关系和害虫防治外,有机碳含量与所有生态系统服务都存在正相关关系,这些关系的强度因植被类型而异。其中,POC与森林的C储存、水分调节、有机质分解、灌丛的C储存、有机质分解、草地的生物量生产和C储存呈正相关,而MAOC与森林的养分循环、C储存、草地的生物量生产和C储存呈正相关。干旱(1−年平均降水/年平均潜在蒸散)也影响了这些关联的程度,在高干旱条件下,这种联系一直较弱(> 0.8)。总体而言,我们的研究结果强调,随着干旱化的持续,潜在的POC和MAOC损失不仅威胁到土壤C的储存,而且威胁到依赖这两个有机碳组分的其他基本生态系统服务的维持。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Vegetation type and aridity modulate the role of soil organic carbon fractions in shaping dryland ecosystem services
Soil organic carbon (SOC) supports multiple ecosystem services in drylands. However, the influence of the two main fractions of SOC −particulate organic carbon (POC) and mineral-associated organic carbon (MAOC)- on ecosystem services, and whether vegetation type and aridity shape this relationship, remains to be explored in global drylands. Here we used a global database of 251 dryland ecosystems to assess the association of POC and MAOC contents with seven ecosystem services (biomass production, nutrient cycling, pest control, mutualism, C storage, water regulation, and organic matter decomposition). We found positive associations between both SOC fractions and all ecosystem services, except mutualism and pest control, with the strength of these relationships varying across vegetation types. Specifically, POC was positively associated with C storage, water regulation, and organic matter decomposition in forests, with C storage and organic matter decomposition in shrublands, and with biomass production and C storage in grasslands, while MAOC was positively associated with nutrient cycling and C storage in forests and with biomass production and C storage in grasslands. Aridity (1 − mean annual precipitation/mean annual potential evapotranspiration) also shaped the magnitude of these associations, with consistently weaker links under high aridity (> 0.8). Overall, our results highlight that the potential POC and MAOC losses with ongoing aridification threaten not only soil C storage but also the maintenance of other fundamental ecosystem services which rely on both SOC fractions.
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来源期刊
Geoderma
Geoderma 农林科学-土壤科学
CiteScore
11.80
自引率
6.60%
发文量
597
审稿时长
58 days
期刊介绍: Geoderma - the global journal of soil science - welcomes authors, readers and soil research from all parts of the world, encourages worldwide soil studies, and embraces all aspects of soil science and its associated pedagogy. The journal particularly welcomes interdisciplinary work focusing on dynamic soil processes and functions across space and time.
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