碳酸盐岩风化碳汇是喀斯特碳汇的重要组成部分,理解其对生态系统服务功能的影响机制是实现该区域生态系统可持续管理的关键。然而,当前研究侧重单一生态系统服务,对长时间序列上碳酸盐岩风化碳汇如何影响不同(多对)生态系统服务的关系...碳酸盐岩风化碳汇是喀斯特碳汇的重要组成部分,理解其对生态系统服务功能的影响机制是实现该区域生态系统可持续管理的关键。然而,当前研究侧重单一生态系统服务,对长时间序列上碳酸盐岩风化碳汇如何影响不同(多对)生态系统服务的关系仍知之甚少。为此,以全球喀斯特出露面积最大的区域——西南地区为研究案例,基于2000—2020年长时序多源遥感与再分析数据,耦合热力学溶蚀模型和相关分析等多种方法揭示了碳酸盐岩风化碳汇对土壤保持、产水量与碳储量三种生态系统服务功能权衡协同关系的动态。结果显示,研究时段内西南喀斯特地区碳酸盐岩风化碳汇通量达7.04 t C km^(-2) a^(-1),并以年均40 kg C km^(-2)的速率增长。三项生态系统服务功能均有75%以上的区域呈现出显著改善趋势,其两两之间的关系以协同为主导,面积占比超过69%,超过一半(52.4%)的区域实现了三种服务的同步增强。生态系统服务间的协同强度随风化碳汇的增加而增强。研究结果强调关注喀斯特地质碳汇过程及对生态系统服务功能关系的影响,能够提供更精细化的信息以支撑区域生态恢复与碳中和目标决策成效。展开更多
Permafrost wetlands are closely related to potential greenhouse gas emissions under climate warming.In recent decades,climate change and human activities have induced extensive permafrost degradation,severely influ-en...Permafrost wetlands are closely related to potential greenhouse gas emissions under climate warming.In recent decades,climate change and human activities have induced extensive permafrost degradation,severely influ-encing the stability of wetlands in permafrost regions.The widely observed significant changes in vegetation cover,hydrological conditions,and soil carbon stability are strongly affecting the carbon cycle and the carbon sources/sinks of permafrost wetlands.In this review,research progress on the response and feedback mechanisms of wetland ecological processes to permafrost degradation under the influences of climate change is first explored,including the impacts of permafrost degradation on the vegetation dynamics,hydrological processes,soil carbon decomposition,greenhouse gas emissions,and carbon feedback.In addition,several questions regarding recent advances are raised and some suggestions are provided for future related research pertaining to the following issues:(i)linkages and response relationships between permafrost degradation and the vegetation-hydrology-carbon cycle in permafrost wetlands,(ii)stabilization mechanisms of their carbon sink function,(iii)accurate estimation of the carbon sequestration rate and sink potential,and(iv)carbon feedback in permafrost wetlands under future climate change scenarios.The findings will provide critical scientific evidence and data support for protecting wetland ecosystems in permafrost regions under changing climate conditions and the implementation of carbon peaking and carbon neutrality strategies.展开更多
文摘碳酸盐岩风化碳汇是喀斯特碳汇的重要组成部分,理解其对生态系统服务功能的影响机制是实现该区域生态系统可持续管理的关键。然而,当前研究侧重单一生态系统服务,对长时间序列上碳酸盐岩风化碳汇如何影响不同(多对)生态系统服务的关系仍知之甚少。为此,以全球喀斯特出露面积最大的区域——西南地区为研究案例,基于2000—2020年长时序多源遥感与再分析数据,耦合热力学溶蚀模型和相关分析等多种方法揭示了碳酸盐岩风化碳汇对土壤保持、产水量与碳储量三种生态系统服务功能权衡协同关系的动态。结果显示,研究时段内西南喀斯特地区碳酸盐岩风化碳汇通量达7.04 t C km^(-2) a^(-1),并以年均40 kg C km^(-2)的速率增长。三项生态系统服务功能均有75%以上的区域呈现出显著改善趋势,其两两之间的关系以协同为主导,面积占比超过69%,超过一半(52.4%)的区域实现了三种服务的同步增强。生态系统服务间的协同强度随风化碳汇的增加而增强。研究结果强调关注喀斯特地质碳汇过程及对生态系统服务功能关系的影响,能够提供更精细化的信息以支撑区域生态恢复与碳中和目标决策成效。
基金supported by the National Natural Science Foundation of China ( 42220104009 and 42293263 ).
文摘Permafrost wetlands are closely related to potential greenhouse gas emissions under climate warming.In recent decades,climate change and human activities have induced extensive permafrost degradation,severely influ-encing the stability of wetlands in permafrost regions.The widely observed significant changes in vegetation cover,hydrological conditions,and soil carbon stability are strongly affecting the carbon cycle and the carbon sources/sinks of permafrost wetlands.In this review,research progress on the response and feedback mechanisms of wetland ecological processes to permafrost degradation under the influences of climate change is first explored,including the impacts of permafrost degradation on the vegetation dynamics,hydrological processes,soil carbon decomposition,greenhouse gas emissions,and carbon feedback.In addition,several questions regarding recent advances are raised and some suggestions are provided for future related research pertaining to the following issues:(i)linkages and response relationships between permafrost degradation and the vegetation-hydrology-carbon cycle in permafrost wetlands,(ii)stabilization mechanisms of their carbon sink function,(iii)accurate estimation of the carbon sequestration rate and sink potential,and(iv)carbon feedback in permafrost wetlands under future climate change scenarios.The findings will provide critical scientific evidence and data support for protecting wetland ecosystems in permafrost regions under changing climate conditions and the implementation of carbon peaking and carbon neutrality strategies.
