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土地利用变化对陆地生态系统碳循环的影响是当今全球碳循环和气候变化研究的热点。土地利用变化对土壤有机碳含量、组分及稳定性产生影响,从而影响土壤CO_2,进而控制岩溶地质过程的碳汇效应。本文综述了岩溶区土地利用变化对土壤有机碳与岩溶地质过程的影响,阐明了岩溶区土地利用变化对土壤有机碳及其组分影响的过程与机理,土地利用变化对岩溶地质过程影响的土壤CO_2浓度调控机制、水循环影响及无机酸干扰等影响机制。提出了土壤固碳的团聚体归宿和分配,团聚体物理保护机制及钙的化学稳定机制是当前岩溶土壤有机碳深化的方向;土壤CO_2、水循环和无机酸在土地利用变化过程中以何种关系共同影响岩溶碳汇强度;水生光合作用利用DIC形成的稳定有机质与DIC、AOC通量的关系及其对土地利用变化的响应机理是岩溶碳循环前沿领域;而石漠化治理对岩溶碳循环的影响及相关固碳增汇技术的研究是需要重视的工作。
The impact of land-use change on the carbon cycle of terrestrial ecosystems is a hot topic in the research of global carbon cycle and climate change today. Land use change has an impact on soil organic carbon content, composition and stability, thus affecting soil CO2, and then controlling the carbon sink effect of karst geological processes. In this paper, the effects of land use change on soil organic carbon and karst geology in karst area are summarized. The process and mechanism of the impact of land use change on soil organic carbon and its components in karst area are clarified, and the influence of land use change on karst geological process CO 2 concentration control mechanism, the impact of water cycle and inorganic acid interference and other mechanisms. The fate and distribution of soil carbon fixation aggregates are proposed. The mechanism of aggregate physical protection and chemical stability of calcium are the direction of deepening of organic carbon in karst soil. What is the relationship between soil CO_2, water cycle and mineral acid in the process of land use change? The relationship between stable organic matter (DIC) and AOC flux formed by DIC in aquatic photosynthesis and its response to land use change is the frontier of the carbon cycle in karst areas. However, the control of rocky desertification on the carbon cycle of karst Impact and related carbon sequestration technology is the need to pay attention to the work.