Carbonate influences on the biogeochemical processes driving the stabilization of soil organic carbon in drylands

碳酸盐对驱动旱地土壤有机碳稳定的生物地球化学过程的影响

基本信息

批准号：
EP/X022498/1
负责人：
Kirsten Ball
金额：
$ 32.5万
依托单位：
University of Aberdeen
依托单位国家：
英国
项目类别：
Fellowship
财政年份：
2023
资助国家：
英国
起止时间：
2023 至无数据
项目状态：
未结题

来源：
https://gtr.ukri.org/projects?ref=EP%2FX022498%2F1
关键词：
Carbonate influences biogeochemical processes driving

项目摘要

Increasing temperatures and worsening drought from climate change are exacerbating soil degradation and desertification indrylands, presenting a major threat to food security. Soil organic carbon (SOC) loss is a strong driver of soil degradation anddesertification. Increasing SOC can mitigate soil degradation, but dryland SOC stocks can be minimal, and critically, most soil carbonin drylands exists as carbonate (SIC). SIC likely moderates the physical stabilization of SOC in the soil mineral matrix via pedogenicprocesses that form SIC-organo-mineral structures. Pedogenic processes may increase SOC stabilization by controlling physical accessof microorganisms to substrate, but it's unclear how they indirectly alter microbial processes and SOC decomposition/stabilization. Tothis end, SIC-SOC-STABLE aims to 1) quantify the global influence of SIC on SOC stabilization in drylands using an established dataset,and 2) validate global patterns along a local field gradient and to generate a detailed understanding of how physical stabilizationstructures, driven by carbonate pedogenesis influence the microbial processes driving SOC stabilization. Further, considering theimpacts of soil management on SOC storage in drylands is fundamental given that soil tillage may accelerate carbonate pedogenesis.It addresses the agricultural implications of IPCC recommended management practices like reduced tillage on SOC stabilization incalcareous soils, by 3) experimentally quantifying the influence of soil disturbance on carbonate pedogenesis and the fate ofmicrobially-mediated SOC storage. Finally, because reduced tillage requires greater mechanical weeding, a role which predominantlyfalls on women in rural drylands, the proposed MSCA considers gender disparity in labor when advocating best practices to increasesoil carbon. To achieve this, it 4) develops a scientifically robust training and support tool to empower and equip women for key rolesin agricultural management.

气候变化导致的温度升高和干旱加剧，这加剧了土壤退化和荒漠化的Indrylands，对粮食安全构成了重大威胁。土壤有机碳（SOC）损失是土壤降解和降解的强大驱动力。增加的SOC可以减轻土壤的降解，但是旱地SOC库存可能是最小的，并且至关重要的是，大多数土壤碳酸盐旱地作为碳酸盐（SIC）存在。 SIC可能会通过形成SIC-Organo-Mineral结构的PedogenicProcesses来缓和土壤矿物基质中SOC的物理稳定。根据控制微生物的物理访问到底物的物理访问可能会增加SOC稳定，但目前尚不清楚它们如何间接改变微生物过程和SOC分解/稳定。 Tothis End，SIC-SOC稳定的目的是1）使用已建立的数据集量化SIC对旱地的SOC稳定性的全球影响，以及2）沿本地田间梯度验证全球模式，并详细了解对碳酸盐稳定的物理稳定结构如何影响由碳酸盐研究影响微生物稳定过程。 Further, considering theimpacts of soil management on SOC storage in drylands is fundamental given that soil tillage may accelerate carbonate pedogenesis.It addresses the agricultural implications of IPCC recommended management practices like reduced tillage on SOC stabilization incalcareous soils, by 3) experimentally quantifying the influence of soil disturbance on carbonate pedogenesis and the fate ofmicrobially-mediated SOC storage.最后，由于减少的耕作需要更大的机械除草，这是旱地农村地区妇女主要降临的作用，因此拟议的MSCA在提倡最佳实践以增加碳碳时会考虑分娩的性别差异。为了实现这一目标，它4）开发了一种科学强大的培训和支持工具，以赋予妇女的能力并为妇女提供关键的农业管理。