摘要
研究复垦土壤中活性和难降解碳氮组分随复垦年限和施肥措施变化的特征,以期深入理解采煤塌陷区复垦土壤碳氮的稳定性机制.采集复垦4年和8年的定位试验各处理耕层(0-20 cm)土样,利用H2SO4水解法分析活性组分Ⅰ、Ⅱ和难降解组分中有机碳(SOC)、全氮(TN)的变化特征.试验设不施肥(CK)、平衡施氮磷钾肥(CF)、单施有机肥(M)、有机无机肥配施(MCF)和生物有机肥配施化肥(MCFB) 5个处理.结果显示,复垦土壤及各组分中有机碳、全氮含量的变化趋势总体均表现为随复垦年限的增加而提高.复垦4年和8年,同CK相比,CF、M、MCF和MCFB处理均显著提高了SOC和TN含量,增幅分别达40.12%-89.97%(4年)、34.16%-71.65%(8年)和22.66%-60.06%、25.86%-37.93%,且以M处理增幅最大;M、MCF和MCFB处理均显著提高了活性组分Ⅱ中碳氮含量,增幅分别为91.74%-141.22%、60.03%-88.27%和24.77%-51.15%、19.73%-66.67%;同CF相比,MCF和MCFB处理均显著提高了复垦8年土壤活性组分Ⅱ中碳氮含量,增幅分别为22.94%-44.62%和41.22%-52.19%.当SOC、活性组分Ⅰ、Ⅱ中碳含量分别达到9.01、1.82和2.25 g/kg时,作物产量达到最大值.本研究表明当养分投入量相同时,单施有机肥更有利于采煤塌陷区复垦土壤及各组分碳氮的累积;另外,土壤有机碳投入水平以及时间还应根据上述阈值进行调整,从而满足土壤科学培肥的要求,达到较高的固碳效率.
To increase our understanding of the stabilization mechanism of soil organic carbon(SOC) and total nitrogen(TN),variations in SOC and TN were studied in labile and recalcitrant fractions of reclaimed soils,along with reclamation age and fertilization regimes.Topsoil samples(0-20 cm) were collected from different treatments of a 4-year and an 8-year experiment.SOC and TN in labile(I and II) and recalcitrant fractions were analyzed using the sulfuric acid hydrolysis method.Five different fertilization treatments(no fertilizer [CK],chemical fertilizer with nitrogen,phosphorous,and potassium(CF);organic manure alone(M);chemical fertilizer combined with manure(MCF);compound fertilizer consisting of a biological organic fertilizer,a chemical fertilizer,and manure [MCFB]) were applied within each reclamation age.SOC and TN content in bulk soil samples and in each fraction increased with reclamation age.Compared with the CK group,after 4 years and 8 years of reclamation,CF,M,MCF,and MCFB treatments all significantly increased SOC and TN content by 40.12%-89.97%(4 years),34.16%-71.65%(8 years),22.66%-60.06%,and 25.86%-37.93%,respectively.The greatest effect was seen with M treatment M,MCF,and MCFB treatments markedly increased C and N content in labile fraction II by 91.74%-141.22%,60.03%-88.27%,24.77%-51.15%,and 19.73%-66.67%,respectively.Moreover,MCF and MCFB treatments markedly increased OC and TN content in labile fraction Ⅱ by 22.94%-44.62% and 41.22%-52.19%,respectively,compared with CF,after 8 years of reclamation.In addition,the thresholds of SOC content in labile fraction Ⅰ and Ⅱ for maximum crop yield were 9.01,1.82,and 2.25 g/kg,respectively.In treatment conditions with the samenutrient inputs,application of manure alone was more beneficial for the accumulation of SOC,TN,and OC in all fractions.In addition,for optimal fertilization,the level and time of SOC input should be adjusted according to the above thresholds to achieve higher carbon sequestration efficiency.
作者
谢钧宇
孟会生
焦欢
洪坚平
张杰
李丽娜
黄晓磊
栗丽
赵林婷
李廷亮
XIE Junyu;MENG Huisheng;JIAO Huan;HONG Jianping;ZHANG Jie;LI Lina;HUANG Xiaolei;LI Li;ZHAO Linting;LI Tingliang(College of Resources and Environment,Shanxi Agricultural University,Taigu 030801,China;Shanxi Province Key Laboratory of Soil Environment and Nutrient Resources,Taiyuan 030031,China;College of Urban and Rural Construction,Shanxi Agricultural University,Taigu 030801,China)
出处
《应用与环境生物学报》
CAS
CSCD
北大核心
2019年第5期1113-1121,共9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（2019003）
山西省优秀博士来晋工作奖励项目（SXYBKY201805）资助~~
关键词
复垦土壤
施肥措施
活性有机碳
难降解有机碳
土壤有机碳阈值
reclaimed soil
fertilization regime
labile organic carbon
recalcitrant organic carbon
soil organic carbon(SOC)critical level
