福建省水田土壤有机碳积累对未来温度升高的响应  

Response of Soil Organic Carbon Accumulation in Paddy Fields in Fujian Province to Future Temperature Increases

作　　者：车燕 邱龙霞[1,2] 吴凌云 龙军 毋亭 李晶[1,2] 邢世和 张黎明 CHE Yan;QIU Long-xia;WU Ling-yun;LONG Jun;WU Ting;LI Jing;XING Shi-he;ZHANG Li-ming(College of Resource and Environment,Fujian Agriculture and Forestry University,Fuzhou 350002,China;University Key Laboratory of Soil Ecosystem Health and Regulation in Fujian,Fuzhou 350002,China;Fujian Crop Land Construction and Soil and Fertilizer Station,Fuzhou 350002,China;School of Biological Science and Technology,Minnan Normal University,Zhangzhou 363000,China)

机构地区：[1]福建农林大学资源与环境学院,福州350002 [2]土壤生态系统健康与调控福建省高校重点实验室,福州350002 [3]福建省农田建设与土壤肥料技术总站,福州350002 [4]闽南师范大学生物科学与技术学院,漳州363000

出　　处：《环境科学》2023年第5期2775-2785,共11页Environmental Science

基　　金：国家自然科学基金项目(41971050);福建省自然科学基金项目(2021J01117);教育部人文社科青年基金项目(21YJC630090)。

摘　　要：明确未来温度升高下我国农田土壤的碳“源-汇”效应是合理制定碳中和管理政策的基础.以我国典型亚热带地区——整个福建省84个县(市、区)水田土壤为研究对象,基于目前该区域最详细的1∶5万大比例尺土壤数据库和生物地球化学过程模型(DNDC),模拟了2017~2053年不同温度升高情景下全省水田土壤的有机碳动态变化.结果表明,在常规温度(对照)以及温度上升2、4和6℃这4种情景分析下,福建省水田土壤的固碳总量分别为11.56、9.44、7.08和4.91 Tg,年均固碳速率(以C计)分别为173、141、106和74 kg·(hm^(2)·a)^(-1),说明随着未来温度升高固碳速率在下降,但总体而言在6℃升温下全省水田土壤仍是“碳汇”.从不同土壤类型来看,潜育水稻土受气温升高的影响最大,不同处理下固碳速率降幅介于20%~69%之间,而盐渍水稻土受气温升高的影响最小,不同处理下固碳速率降幅介于14%~43%之间.从不同行政区来看,受气温升高影响最大的是位于武夷山脉附近的三明市,不同处理下固碳速率降幅介于27%~83%之间,而受气温升高影响最小的是沿海的泉州市和莆田市,不同处理下固碳速率降幅分别介于10%~41%与14%~42%之间.总体来看,福建省各土壤类型和行政区的水田固碳速率因其本底土壤属性和气候环境等不同而对未来温度升高的响应程度差异很大.Understanding the effect of the soil carbon"source-sink"in cropland in China under future warming scenarios is the basis for making reasonable carbon neutralization policies.This study focused on the paddy soil in Fujian Province,a typical subtropical region in China including 84 counties(cities and districts).We employed the 1:50000 soil database and biogeochemical process model(DNDC)to simulate the dynamic changes in paddy soil organic carbon under different warming scenarios for the period of 2017-2053.The results indicated that in the context of normal temperature(control run)and 2,4,and 6℃of warming,the total amounts of carbon sequestration of paddy soil in Fujian Province were 11.56,9.44,7.08,and 4.91 Tg,respectively;accordingly,the average annual carbon sequestration rates(expressed by C)were 173,141,106,and 74 kg·(hm^(2)·a)^(-1),indicating that the rate of carbon sequestration was decreasing with the increase in future temperature.However,overall,the paddy field soil in the province was still a"carbon sink"under the warming of 6(C.We also found that the gleyed paddy soil was mostly affected by the increase in temperature,and the decrease in carbon sequestration rate ranged from 20%to 69%using different treatments.In contrast,the salinized paddy soil was slightly affected,with a 14%-43%decrease in carbon sequestration rates.As for the different administrative regions,Sanming City was the most affected by temperature increase,with the rate of carbon sequestration decreasing by 27%-83%using different treatments.However,it was reduced by only 10%-41%and 14%-42%in Quanzhou and Putian(coastal areas),respectively.Overall,due to different soil properties,fertilization management,and climatic environment,there was a strong variability in the carbon sequestration rates of paddy soil for different soil subtypes and administrative regions in Fujian in response to future climatic warming.

关 键 词：福建省 土壤有机碳 1∶5万土壤数据库 水稻土 温度 

分 类 号：X171.1[环境科学与工程—环境科学]