论文部分内容阅读
区域土壤碳库的估算不仅是陆地土壤碳循环研究的重要内容,同时也可为国家尺度的土壤碳库的估算提供更多的数据支持。利用上海第二次土壤普查资料,结合GIS技术对上海土壤有机碳储量、碳密度及其空间分布格局展开研究,结果表明,上海地区0～100cm深度的土壤有机碳总储量为5.76×107 t,占全国的0.062 6%,0～100cm的平均土壤有机碳密度为10.55kg/m2,高于全国平均值,反映出上海土壤具有较高的碳蓄积能力。各类土壤中,水稻土的土壤碳储量最大,其次是灰潮土和滨海盐土,而黄棕壤由于面积狭小,所以土壤碳储量最小。各类土壤0～100cm土壤有机碳密度的大小顺序依次为水稻土>灰潮土>黄棕壤>滨海盐土。从空间分布格局来看,上海土壤碳密度呈现为西高东低,在局部范围内还表现出高低相间,错综复杂的局面,这种分布规律在一定程度上体现了地形、微地貌、母质、土地利用方式等因素的影响。而快速的城市化引起的土地利用变化造成了土壤碳库的净碳损失量为392.44万t,相当于2000年化石燃料产生的碳排放的9.86%,这表明在经济和城市快速发展地区,土地利用变化已经成为影响土壤碳库的重要驱动力。
Estimation of regional soil carbon stocks is not only an important part of the land carbon cycle research, but also provides more data support for the estimation of soil carbon stocks on a national scale. Based on the data from the second soil survey in Shanghai and the GIS technology, the soil organic carbon storage, carbon density and their spatial distribution were studied. The results showed that the total organic carbon storage in Shanghai at the depth of 0-100 cm was 5.76 × 107 t, Accounting for 0.062 6% of the national total. The average soil organic carbon density at 0 ~ 100 cm is 10.55 kg / m2, which is higher than the national average, reflecting that Shanghai soil has a high carbon storage capacity. Of all kinds of soils, paddy soil had the largest soil carbon storage, followed by gray soil and coastal saline soil, while yellow brown soil had the smallest soil carbon storage because of its small area. The order of soil organic carbon density in 0 ~ 100cm soil layer was paddy soil> gray tide soil> yellow brown soil> coastal saline soil. From the perspective of spatial distribution pattern, the soil carbon density in Shanghai shows a trend of high in the west and low in the east, and in the local area there are also intricate and intricate patterns of high, low, medium and high. This distribution law reflects the topography, micro-topography, parent material and land use to a certain extent Ways and other factors. The rapid urbanization caused by land-use change resulted in a net carbon loss of 3.9244 million tons of soil carbon pool, equivalent to 9.86% of the carbon emissions generated by fossil fuels in 2000, indicating that in the rapid economic and urban areas, land The use of change has become an important driver of soil carbon pool.