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首页> 中文期刊> 《生态环境学报》 >基于高精度土壤数据库的苏北旱地固碳速率和潜力研究

基于高精度土壤数据库的苏北旱地固碳速率和潜力研究

         
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Upland covers more than 70% of China’s cropland; therefore understanding carbon sequestration rate and potential for upland at different periods plays a key role in making policies on cropland in China to reduce greenhouse gas emissions and recommend management measures of carbon sequestration and mitigation CO2 emissions. Taking the upland in the 29 counties (or cities) of the northern Jiangsu Province, a part of Huang-Huai-Hai region, as study zone. The study linked the biogeochemical DNDC (Denitrification and decomposition) model to a newly soil map with improved spatial high-resolution (1∶50000 soil database) of the northern Jiangsu Province to estimate the carbon sequestration rate and potential for three different periods for 2010─2040(30 a), 2010─2070 (60 a) and 2010─2100 (90 a). The result shows, the carbon sequestration amount for the upland of 3.93×106 hm2 in the northern Jiangsu Province is 43.18, 69.40 and 88.91 Tg, with the average annual carbon sequestration rate standing at 367, 295 and 252 kg·hm-2, respectively. For soil groups, the highest carbon sequestration rate occurs in fluvo-aquic soil and purplish soil, with the average annual carbon sequestration amount mostly above 300 kg·hm-2 at different periods; however, the lowest in lithosols soil and limestone soil, with the average annual carbon sequestration amount almost below 200 kg·hm-2 at different periods. For the spatial distribution, the Guannan city, located in the northern part, experiences the greatest carbon sequestration rate in the region, with the average annual carbon sequestration amount beyond 330 kg·hm-2at different periods; while, the Xuyi city, located in the central parts, with the average annual carbon sequestration amount below 250 kg·hm-2 at different periods, witnesses the lowest carbon sequestration rate. Overall, the differences of soil groups and counties (or cities) in carbon sequestration potential and rate are obvious in northern Jiangsu Province, so it is imperative to appropriately formulate the measures of carbon sequestration and mitigation CO2 emissions according to the soil groups and administrative units in the region.%旱地占我国农田面积的70%以上，明确它未来不同时段的固碳速率和潜力对于制定中国农田温室气体减排清单及各个时期“固碳减排”政策皆具有重要意义。选择属于黄淮海平原一部分的江苏省北部（简称“苏北地区”）29个县（市）旱地为研究区，以最新建立的1∶50000高精度大比例尺土壤数据库为基础，利用生物地球化学模型DNDC（Denitrification and Decomposition）估算了该地区2011─2040年（30 a）、2011─2070年（60 a）和2011─2100年（90 a）3个时段的固碳速率和潜力。结果表明，苏北地区393多万平方公顷旱地在未来30、60和90 a的固碳总量分别为43.18、69.40和88.91 Tg；年均固碳速率分别为367、295和252 kg·hm-2。其中，潮土和紫色土的固碳速率最大，各个时段的年均固碳量一般在300 kg·hm-2以上，而石质土和石灰土固碳速率最小，各个时段的年均固碳量一般在200 kg·hm-2以下。从空间分布来看，地处北部的灌南县固碳速率最大，各个时段的年均固碳量均超过330 kg·hm-2；而中部的盱眙县固碳速率最小，各个时段的年均固碳量均低于250 kg·hm-2。总体来看，苏北旱地不同土类和各个县（市）的未来固碳速率和潜力差异很大。因此，今后针对该地区不同的土壤类型和行政单元制定适宜的固碳减排措施是十分必要的。

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