洞庭湖区土壤实测碳量的分布规律及其对全球变化的响应

研究区域土壤碳库的分布特征对于全球变化研究、土壤肥力和生态系统的功能评价具有重要意义。在缺乏长期实测资料情况下,国内外多以模型、第二次土壤普查资料或较稀的实测数据进行研究。文中利用洞庭湖区生态地球化学调查实测数据,研究影响该区土壤碳分布的因素认为区域土壤碳量处于全国的中、高级水平;地质地貌条件是影响土壤无机碳量分布的最重要因素;土壤类型对土壤碳量有影响;本区水土流失强度对表层土壤总有机碳量影响不大;经济林、竹林的土地利用方式及防治土壤潜育化有利于土壤的碳储存;从TOC等沉积的时空演化规律说明,本区环境变化是对全球环境变化的响应,为区域土地利用、促进土壤碳固定及全球环境变化研究提供了依据。

The distribution rule of soil carbon in Dongting lake district and its response to the global climate change

It is important to research on the distribution rule of the regional soil carbon pool for the study of global change,soil fertility and ecosystem function appraisal.The domestic and foreign scientists do the research by using models and the second soil survey data for lack of long-term actual material.This article studies several factors affecting soil carbon distribution by using ecological-geochemistry investigation data in Dongting lake district.The study revealed that the regional soil carbon quantity is in the high-intermediate level of our country,and that the geological landform is the most important factor affecting the distribution of soil inorganic carbon quantity,and the soil type is also an influential factor.The soil erosion has little effect on TOC in the surface layer.The utilization of land by forestation,and the prevention and control of soil dives nurtures are advantageous to the soil carbon storage.The temporal-spatial distribution rules of the deposition of TOC and so on indicate that the regional environmental variation is the response to the global environmental variation.This research provided a basis for the study of regional land utilization,soil carbon fixation and global environment variation.