河南省土壤有机碳储量及空间分布

利用河南省1∶20万土壤数据库估算了河南省土壤有机碳储量，并分析了其空间分布规律.结果表明：河南省陆地土壤有机碳含量约为10.27×10⁸ t，占全国储量的1.15%；土壤平均碳密度为7.46 kg·m^-2，低于全国平均水平9.60 kg·m^-2；有机碳储量在前4位的土壤类型为潮土、褐土、粗骨土和黄褐土，碳储量都大于1.0×10⁸ t，四者之和占全省总储量的69.65%；沼泽土的有机碳密度最大，为24.54 kg·m^-2，其次为山地草甸土和棕壤，分别为17.69和14.64 kg·m^-2，三者主要分布在西部山区，其碳储量之和仅占全省的6.34%；石质土和风沙土的碳密度含量最低，分别为1.32和1.38 kg·m^-2 ；全省的土壤有机碳密度主要在5～10 kg·m^-2范围内变动.

Soil organic carbon storage and its spatial distribution in Henan Province.

By using 1: 200 000 soil database, the soil organic carbon storage in Henan Province was estimated, and its spatial distribution was analyzed. The results showed that in this province, soil organic carbon storage was about 10.27 x 10(8) t, accounting for 1.15% of the total in China, and its density was 7.46 kg m(-2) on average, being lower than that (9.60 kg m(-2)) in this country. The top four soil types in organic carbon storage were fluvo-aquic soil, cinnamon soil, skeletal soil, and yellow cinnamon soil, with the storage all being higher than 1.0 x 10(8) t and totally taken up 69.65% of that in Henan. The organic carbon density was the highest in bog soil (24.54 kg m(-2)), followed by in mountain meadow soil (17.69 kg m(-2)) and brown soil (14.64 kg m(-2)). These three soil types mainly distributed in the mountainous areas of west Henan, and the sum of their organic carbon storage was only accounted for 6.34% of the total in the province. The organic carbon density was the lowest in rocky soil (1.32 kg m(-2)) and aeolian sandy soil (1.38 kg m(-2)). In general, the density of soil organic carbon in Henan province mostly varied from 5 kg m(-2) to 10 kg m(-2).