Nitrogen(N)loss is a major limiting factor affecting agricultural productivity in saline-alkali soils,with ammonia(NH_(3))volatilization and N leaching being the main sources of N loss.In this study,the dynamics of NH...Nitrogen(N)loss is a major limiting factor affecting agricultural productivity in saline-alkali soils,with ammonia(NH_(3))volatilization and N leaching being the main sources of N loss.In this study,the dynamics of NH_(3)volatilization were measured using the open static chamber method(sponge sampling),alongside the distribution of^(15)N and NO_(3)^(-)-N concentrations in layers,in a 30-cm soil column experiment with vermicompost addition after incorporation of^(15)N-labeled urea in the upper layer(0-10 cm)of a saline-alkali soil.Destructive sampling was conducted on days 20 and 60 of the column experiment to investigate the influencing factors of NH_(3)volatilization and^(15)N/NO_(3)^(-)retention,respectively.The results showed that the addition of vermicompost to saline-alkali soil decreased cumulative NH_(3)volatilization by 45.1%,decreased the^(15)N concentration in the bottom layer(20-30 cm)by 17.1%,and increased the^(15)N concentration in the upper soil by 48.7%.Vermicompost regulated the abundances of amoA,amoC,and nxrA genes,which can decrease NH_(3)volatilization by converting substrate NH_(4)^(+)to NO_(3)^(-).Additionally,Ca^(2+)adsorption is enhanced(increased by 6.2%)by increasing soil cation exchange capacity(increased by 20.6%),thus replacing the adsorption of Na^(+)(decreased by 13.8%)and decreasing the desorption of NH_(4)^(+).Vermicompost enhanced the adsorption of NO_(3)^(-)by increasing Ca^(2+)and Mg^(2+)and decreasing Cl-by 30.4%in the upper soil.This study concluded that vermicompost addition can inhibit N loss by reducing NH_(3)volatilization and improving^(15)N/NO_(3)^(-)retention in saline-alkali soils.展开更多
砾石广泛分布于土壤内部和表面,显著影响着土壤特性和生态系统功能。为系统了解土壤环境对砾石响应相关领域研究进展,探究其研究热点与未来发展趋势,基于Web of Science核心数据库(WoS)和中国知网数据库(CNKI),借助Citespace和VOSviewe...砾石广泛分布于土壤内部和表面,显著影响着土壤特性和生态系统功能。为系统了解土壤环境对砾石响应相关领域研究进展,探究其研究热点与未来发展趋势,基于Web of Science核心数据库(WoS)和中国知网数据库(CNKI),借助Citespace和VOSviewer可视化软件,从发文数量、发文作者、发文国家、发文机构、刊载期刊、关键词共现及其演变进程等方面对2000-2022年国内外土壤环境对砾石响应相关领域研究进行定量综述和可视化分析。结果表明:国内外在该领域发表文献数量呈快速增长态势,且中文文献发文量高于英文文献;中国、美国、比利时、英国是英文文献发文量排名前四的国家,中国学者发表论文数量最多,占英文文献总量的47.34%,是土壤环境对砾石响应研究领域的主力军;国内外对该领域的研究主要聚焦在砾石单一特征(砾石覆盖度、砾石尺寸、砾石位置等)对水文过程、生态演替及环境效益等影响。因此,未来应继续加强土壤水文过程对砾石响应机制、营养元素在砾石-土壤-植物之间的迁移机制以及“砾石-微生物-植物”系统内部互作效应等方面的研究。可为全球具有相似土壤情况的生态系统服务和农业生产提供新思路、新方法,从而实现节水、高效、高产的农业生产目标,为水土保持等生态服务提供理论依据。展开更多
基金supported by the National Key R&D Program of China(No.2021YFD1900901)the National Natural Science Foundation of China(No.32271711).
文摘Nitrogen(N)loss is a major limiting factor affecting agricultural productivity in saline-alkali soils,with ammonia(NH_(3))volatilization and N leaching being the main sources of N loss.In this study,the dynamics of NH_(3)volatilization were measured using the open static chamber method(sponge sampling),alongside the distribution of^(15)N and NO_(3)^(-)-N concentrations in layers,in a 30-cm soil column experiment with vermicompost addition after incorporation of^(15)N-labeled urea in the upper layer(0-10 cm)of a saline-alkali soil.Destructive sampling was conducted on days 20 and 60 of the column experiment to investigate the influencing factors of NH_(3)volatilization and^(15)N/NO_(3)^(-)retention,respectively.The results showed that the addition of vermicompost to saline-alkali soil decreased cumulative NH_(3)volatilization by 45.1%,decreased the^(15)N concentration in the bottom layer(20-30 cm)by 17.1%,and increased the^(15)N concentration in the upper soil by 48.7%.Vermicompost regulated the abundances of amoA,amoC,and nxrA genes,which can decrease NH_(3)volatilization by converting substrate NH_(4)^(+)to NO_(3)^(-).Additionally,Ca^(2+)adsorption is enhanced(increased by 6.2%)by increasing soil cation exchange capacity(increased by 20.6%),thus replacing the adsorption of Na^(+)(decreased by 13.8%)and decreasing the desorption of NH_(4)^(+).Vermicompost enhanced the adsorption of NO_(3)^(-)by increasing Ca^(2+)and Mg^(2+)and decreasing Cl-by 30.4%in the upper soil.This study concluded that vermicompost addition can inhibit N loss by reducing NH_(3)volatilization and improving^(15)N/NO_(3)^(-)retention in saline-alkali soils.
文摘砾石广泛分布于土壤内部和表面,显著影响着土壤特性和生态系统功能。为系统了解土壤环境对砾石响应相关领域研究进展,探究其研究热点与未来发展趋势,基于Web of Science核心数据库(WoS)和中国知网数据库(CNKI),借助Citespace和VOSviewer可视化软件,从发文数量、发文作者、发文国家、发文机构、刊载期刊、关键词共现及其演变进程等方面对2000-2022年国内外土壤环境对砾石响应相关领域研究进行定量综述和可视化分析。结果表明:国内外在该领域发表文献数量呈快速增长态势,且中文文献发文量高于英文文献;中国、美国、比利时、英国是英文文献发文量排名前四的国家,中国学者发表论文数量最多,占英文文献总量的47.34%,是土壤环境对砾石响应研究领域的主力军;国内外对该领域的研究主要聚焦在砾石单一特征(砾石覆盖度、砾石尺寸、砾石位置等)对水文过程、生态演替及环境效益等影响。因此,未来应继续加强土壤水文过程对砾石响应机制、营养元素在砾石-土壤-植物之间的迁移机制以及“砾石-微生物-植物”系统内部互作效应等方面的研究。可为全球具有相似土壤情况的生态系统服务和农业生产提供新思路、新方法,从而实现节水、高效、高产的农业生产目标,为水土保持等生态服务提供理论依据。
