摘要
为探究不同改良剂及施用时间对矿区复垦土壤结构和肥力的影响,在襄垣煤矿复垦区设置田间微区,研究施用改良剂6个月和1年时,泥炭和腐殖酸对复垦土壤机械稳定性团聚体分布与稳定性、土壤有机碳含量及土壤红外光谱特征的影响.结果显示,施用泥炭和腐殖酸6个月时大团聚体(>0.25 mm)含量增加,施用泥炭和腐殖酸1年时大团聚体含量减少,微团聚体(<0.25 mm)含量增加.施用改良剂6个月时,泥炭和腐殖酸各处理土壤平均重量直径(MWD)和几何平均直径(GMD)均高于空白对照,均以5%腐殖酸处理最高,与空白对照相比分别增`加了10.95%和22.43%;施用泥炭和腐殖酸1年时,泥炭各处理土壤MWD和GMD仍高于空白对照,腐殖酸各处理土壤MWD和GMD则均低于空白对照.施用泥炭和腐殖酸能够增加土壤总有机碳及各粒级团聚体有机碳含量.施用改良剂6个月及1年时均以5%腐殖酸处理土壤总有机碳含量最高,分别较空白对照增加了566.35%和502.59%.施用泥炭6个月和1年时土壤>0.25 mm大团聚体有机碳增量最大,而施用腐殖酸6个月和1年时土壤0.25-0.053 mm团聚体有机碳增量最大.综上所述,泥炭和腐殖酸有利于大团聚的形成,能改善团聚体的稳定性,增加土壤有机碳、碳水化合物、含氧官能团、多糖及取代芳香类物质的含量,但施用改良剂1年大团聚体含量和有机碳含量会减少,施用腐殖酸1年会降低复垦土壤团聚体稳定性.
To explore the effects of different amendments on the structure and fertility of reclaimed soil in the mining area,a series of microfield experiments were conducted in Xiangyuan reclaimed soil to study the effects of different proportions of peat and humic acid on the distribution and stability of mechanically stable aggregates,the content of soil organic carbon,and the characteristics of the soil infrared spectrum.The results showed that at 6 months after the application of amendments,the content of macro-aggregates(>0.25 mm)of each peat and humic acid treatment increased;however,the content of macro-aggregates decreased and that of microaggregates increased in each peat and humic acid treatment at 1 year after the application of amendments.At 6 months after the application of amendments,the mean weight diameter(MWD)and geometric mean diameter(GMD)of all peat and humic acid treatments were higher than those of the control(CK),and the highest was for the 5%humic acid treatment,which increased by 10.95%and 22.43%compared with those of CK.At 1 year after the application of amendments,the MWD and GMD of peat treatments were still higher than those of CK;however,the MWD and GMD of humic acid treatments were lower than those of CK.Peat and humic acid can increase the total organic carbon content of the soil.The content of soil total organic carbon in the 5%humic acid treatment was the highest,which increased by 566.35%and 502.59%compared with that in CK at 6 months and 1 year after the application of amendments.The increase in organic carbon in>0.25 mm aggregates was the largest at 6 months and 1 year after the application of peat,whereas that in 0.25-0.053 mm aggregates was the largest at 6 months and 1 year after the application of humic acid.In conclusion,peat and humic acid are beneficial to promote the formation of macro-aggregates;improve the stability of aggregates;increase the content of organic carbon,carbohydrates,oxygen-containing functional groups,polysaccharides and substitute aromatic substances.However,the content of macro-aggregate and organic carbon will decrease 1 year after the application of amendments.The application of humic acid for 1 year will reduce the stability of soil aggregates.
作者
刘新梅
樊文华
张昊
田剑
刘奋武
王改玲
LIU Xinmei;FAN Wenhua;ZHANG Hao;TIAN Jian;LIU Fenwu;WANG Gailing(College of Resources and Environment,Shanxi Agricultural University,Taigu 030801,China)
出处
《应用与环境生物学报》
CAS
CSCD
北大核心
2021年第4期970-977,共8页
Chinese Journal of Applied and Environmental Biology
基金
国家重点联合基金项目(U1710255-4)资助。
关键词
泥炭
腐殖酸
团聚体
有机碳含量
红外光谱特征
peat
humic acid
aggregate
organic carbon content
infrared spectrum characteristics
