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对上海崇明岛开展5种不同种植类型(粮田、菜田、果园、生态林和湿地)1m深度土壤的碳普查,应用地统计方法分析其深层土壤有机碳含量的空间分布特征,研究不同种植类型对土壤有机碳分布和储存的影响,探明土壤碳循环规律。结果表明,崇明岛深层土壤平均有机碳含量为3.94g·kg~(-1),不同深度土壤有机碳含量在8.73~1.72g·kg~(-1),有机碳储量在2.30~0.47×10~6t,耕层土壤(0-40cm)有机碳储量占总量的65.14%。不同深度土层(0-20、20-40、40-60、60-80和80-100cm)有机碳含量空间分布图表明,各层土壤有机碳含量分布特征大致相同,仅湿地土壤有机碳含量在60cm深度以下相对其它种植类型有所提高。种植类型对深层土壤有机碳分布影响显著,土壤有机碳密度大小表现为菜田>粮田>果园>湿地>生态林,土壤有机碳储量则表现为粮田>湿地>生态林>菜田>果园。
The spatial distribution characteristics of deep soil organic carbon in five different planting types (grain fields, vegetable fields, orchards, ecological forests and wetlands) in Chongming Island of Shanghai were studied by geostatistical methods. The effects of different planting Type on the distribution and storage of soil organic carbon, to ascertain the soil carbon cycle. The results showed that the average soil organic carbon content of Chongming Island was 3.94g · kg -1, the contents of soil organic carbon varied from 8.73 to 1.72g · kg -1 at different depths, and the organic carbon storage was 2.30 ~ 0.47 × 10 ~ 6t, topsoil (0-40cm) organic carbon storage accounted for 65.14% of the total. The spatial distribution of organic carbon in different depths of soil (0-20, 20-40, 40-60, 60-80 and 80-100cm) showed that the distribution characteristics of soil organic carbon were similar in all layers. Soil organic carbon Below 60cm depth increased relative to other types of planting. The type of planting has a significant effect on the distribution of soil organic carbon in deep soil. The density of soil organic carbon shows as: vegetable field> grain field> orchard> wetland> ecological forest, while the soil organic carbon storage shows grain field> wetland> ecological forest> vegetable field> orchard .