土壤植硅体碳积累潜力影响因素分析

Influencing Factors of Carbon Sequestration Potential within Phytolith-occluded organic carbon of Soil

土壤植硅体封存有机碳(phytolith-occluded organic carbon,PhytOC)是植物在地质历史时期固碳的重要形式之一,不同植物、不同器官、不同组织、不同生长时期的植硅体形态、含量、大小、分布、组合有所不同。土壤中植硅体碳积累潜力主要受气候变化、植物生产力、植硅体固碳效率、植硅体碳稳定性、土地利用方式、农艺措施、国家宏观政策等因素的影响。本文对各因素进行了较深入的分析。同时指出,固碳机理、植硅体固碳高效品种选育、人为干扰下农林生态系统植硅体碳循环过程为今后植硅体碳汇研究的重点。

Phytolith-occluded organic carbon(PhytOC) of soil is one of the important mechanisms of plant carbon sequestration on the scale of one thousand to ten thousand years. The form, size and combination of each kind of phytolith were different among different plant groups, organs and growth phase of the same organ. Carbon sequestration potential within PhytOC of soil was influenced by many factors,in which the main factors included climate change, plant productivity, carbon sequestration efficiency of phytolith, stability of PhytOC, land use patterns, farming practices, national macroscopic policy and so on. This article discussed the influence factors, suggesting the mechanism of carbon sequestration, selection of high efficient cultivars of carbon sequestration and phytolith carbon cycling in forest and agricultural ecosystems under human disturbance should become the research focus in future.