摘要
以海河流域为研究对象,在GIS技术支持下,根据流域的土壤类型图和土地利用类型图分析了海河流域土壤有机碳密度和碳储量及其空间分布特征。结果表明,海河流域土壤1 m厚度以内土体中土壤有机碳密度在1.62~49.49 kg/m2,其中低于土壤平均有机碳密度的土壤有11种,所占面积比例为55%。海河流域土壤有机碳密度总体上空间分布差异较大,并且呈现由南向北逐渐增加的趋势。海河流域土壤有机碳储量约2 481.94 Tg,其中褐土有机碳储量最大,约为流域总量的1/3;潮土是分布最广的土类,也是流域最重要的农业耕作土类,蕴含着688.98 Tg的土壤有机碳储量。海河流域主要土地利用类型为耕地、林地及草地,所占面积比例约94%,各自的土壤有机碳密度均低于全国平均水平,而农业土壤潮土的大面积分布、成熟林和高覆盖度草地所占面积比例低是造成流域土壤有机碳储量水平低的主要原因。
Based on GIS,the paper tries to be engaged in an analysis of the soil organic carbon density,storage and their spatial distribution in Haihe basin in accordance with the soil type and land use maps,for the study of the soil organic carbon density and storage spatial distribution is of great significance for the global climatic change. The results of our analysis have shown that： the range of the soil organic carbon density in the said basin stands between 1. 62 and49. 49 kg / m^2 within 1 m layer. Seeing that its average density is 7. 84 kg / m^2,it is below the national average level of 10. 83 kg/m^2 and less than that of 16. 13 kg / m^2 in China Northeast. There are 11 kinds of soil whose organic carbon densities are below the average density in the basin,and their area proportion is 55%. The soil organic carbon density in Haihe basin is quite different in space and has an increasing trend from the north to the south on the whole. The soil organic carbon storage in Haihe basin is about 2 481. 94 Tg,with the highest organic carbon density in the cinnamon soil,which accounts for about one-third of the total of the basin. In addition,the organic carbon storage of alluvial soil is 688. 98 Tg,which constitutes not only the most widely distributed soil type but also the most important type of the farming soil in the basin. As a matter of fact,the main forms of land use in the basin are arable crop-fields,woodland and grassland,which account for about 94% of the total basin and their organic carbon density is below the national average level. The large area distribution of agricultural alluvial soil and the low rate of the mature forest and grass land should account for the low level of organic carbon storage in Haihe basin. It is just for this reason that comes the need for proper estimation of carbon storage and feasible land use patterns in Haihe basin,which may help to relieve the likely greenhouse effect and in turn reduce the global carbon cycling.
出处
《安全与环境学报》
CAS
CSCD
北大核心
2015年第1期355-359,共5页
Journal of Safety and Environment
基金
水文水资源与水利工程科学国家重点实验室开放研究基金项目(2011490803)
天津市应用基础及前沿技术研究计划青年基金项目(12JCQNJC05200)
水利部公益性行业专项经费项目(201401041)
关键词
环境学
海河流域
土壤有机碳密度
土壤有机碳储量
土地利用类型
environmentalology
Haihe basin
soil organic carbon density
soil organic carbon storage
land use type
