摘要
为阐明复垦土壤微团聚体对有机碳的固存机制,采集不同施肥措施下连续复垦6年的耕层(0-20 cm)土样,采用物理分组方法,分析微团聚体中各有机碳组分[未受保护的细颗粒有机碳(fPOC)、受物理保护的微团聚体内颗粒有机碳(iPOC)、受化学或生物化学保护的矿质结合态有机碳(MOC)]储量的变化,以及SOC含量、微团聚体中各有机碳组分储量与玉米籽粒产量之间的关系.设对照(CK)、施化肥(NPK)、单施有机肥(M)、有机无机肥配施(MNPK)4个处理,另取未复垦生土(RS)和周边未破坏多年种植熟土(US)作为参照.结果显示,同CK相比,各施肥处理均显著提高了玉米籽粒产量,且以M处理的提高效果最佳.NPK处理显著降低了SOC含量,达6.02%;M和MNPK处理均显著提高了SOC含量、fPOC和iPOC储量,增幅分别为20.74%-33.44%、64.44%-115.56%和110.98%-173.17%,且以MNPK处理增幅最大;但MNPK处理显著降低了MOC储量,达13.35%.微团聚体中各有机碳组分储量与SOC含量均呈显著正相关,尤其是fPOC储量,说明复垦土壤有机碳主要固存在fPOC组分中.SOC含量与玉米籽粒产量呈极显著相关,表明该区域复垦土壤有机碳库仍未达到饱和.本研究表明连续6年复垦显著提高了土壤肥力,但同周边农田土壤相比,仍有待继续培肥;MNPK处理对提高该复垦区SOC含量的效果最佳,且增加的有机碳首先累积在fPOC组分中,因此需要长时间持续投入才能恢复土壤有机碳的稳定性.
To clarify the organic carbon(OC)sequestration mechanism of reclaimed soil microaggregates,the cultivated layer(0-20 cm)soil samples under different fertilization regimes were collected in a 6-year reclaimed field.The physical fractionation method was used to analyze the variation in OC content in microaggregate fractions(unprotected fine particulate OC[fPOC],physically protected intra-microaggregate particulate OC[iPOC],and chemically or biochemically protected mineral-associated OC[MOC])and the relationships between maize grain yield and soil OC(SOC)concentration and OC content in microaggregate fractions.The study involved four treatments:control(CK),chemical fertilizer(NPK),organic manure(M),and manure plus NPK(MNPK).In addition,unreclaimed raw soil(RS)and surrounding undamaged mature soil(US)under cultivation conditions were used as references.Compared with CK,all fertilization treatments significantly increased maize grain yield,and M treatment resulted in the best improvement.NPK treatment significantly decreased SOC concentration by 6.02%;M and MNPK treatments significantly increased SOC concentration,fPOC,and iPOC content by 20.74%-33.44%,64.44%-115.56%,and 110.98%-173.17%,respectively;and MNPK treatment had the best improvement effect;however,MNPK treatment significantly decreased the MOC content by 13.35%.The OC content of all microaggregate fractions was significantly and positively correlated with the SOC concentration,especially the fPOC content,which indicated that SOC was primarily sequestered in the fPOC fraction in the reclaimed soil.SOC concentration was significantly correlated with maize grain yield,indicating that the OC pool of the reclaimed soil in this area is not yet saturated.Although the fertility of the reclaimed soil was significantly improved after 6 years,compared with that of the surrounding farmland soil,further improvement is still needed.The most effective measure to increase SOC concentration in the reclaimed soil is manure combined with chemical fertilizer.The increased OC co
作者
高健永
刘菲
王楚涵
张慧芳
曹寒冰
洪坚平
李廷亮
孟会生
谢钧宇
GAO Jianyong;LIU Fei;WANG Chuhan;ZHANG Huifang;CAO Hanbing;HONG Jianping;LI Tingliang;MENG Huisheng;XIE Junyu(College of Resources and Environment,Shanxi Agricultural University,Taigu 030801,China;Key Laboratory of Soil Environment and Nutrient Resources of Shanxi Province,Taiyuan 030031,China)
出处
《应用与环境生物学报》
CAS
CSCD
北大核心
2021年第4期963-969,共7页
Chinese Journal of Applied and Environmental Biology
基金
国家自然科学基金项目(41807102,U1710255-3)
土壤环境与养分资源山西省重点实验室开放基金项目(2020001,2019003)
山西农业大学科技创新基金(博士科研启动)项目(2020BQ50)资助。
关键词
复垦土壤
土壤有机碳
微团聚体
细颗粒有机碳
有机无机肥配施
reclaimed soil
soil organic carbon
microaggregate
fine particulate organic carbon(fPOC)
manure combined with chemical fertilizer
