The co-utilization of green manure (GM) and rice straw (RS) in paddy fields has been widely applied as an effective practice in southern China.However,its effects on soil aggregate and soil organic carbon (SOC) stabil...The co-utilization of green manure (GM) and rice straw (RS) in paddy fields has been widely applied as an effective practice in southern China.However,its effects on soil aggregate and soil organic carbon (SOC) stability remain unclear.In the present study,the effect of GM,RS,and co-utilization of GM and RS on particle size distribution of soil aggregates and SOC density fractions were measured in a field experiment.The experiment included six treatments,i.e.,winter fallow (WF) without RS return (Ctrl),WF with 50%RS return (1/2RS),WF with 100%RS return (RS),GM without RS return (GM),GM with 50%RS return (GM1/2RS) and GM with 100%RS return (GMRS).The results showed that the proportion of small macro-aggregates (0.25–2 mm) and the mean weight diameter (MWD) of aggregates in the GMRS treatment was greater (by 18.9 and 3.41%,respectively) than in the RS treatment,while the proportion of silt+clay particles (<0.053 mm) was lower (by 14.4%).The concentration of SOC in microaggregates (0.053–0.25 mm)and silt+clay particles was higher in the GMRS treatment than in GM and RS treatments individually.The concentration and proportion of free light organic carbon (fLOC) in aggregates of various particle sizes and bulk soil was greater in the GMRS treatment than the RS treatment,whereas the concentration and proportion of mineral-associated organic carbon in small macroaggregates,microaggregates,and bulk was lower in the GMRS treatment than in the RS treatment.The proportion of intra-aggregate particulate organic carbon (iPOC) was greater in the GMRS treatment than in GM treatment.The GMRS treatment had strong positive effects on iPOC in small macroaggregates,suggesting that SOC was transferred from fLOC to iPOC.In conclusion,co-utilizing green manure and rice straw cultivated the SOC pool by increasing the concentration of fLOC and improved soil carbon stability by promoting the sequestration of organic carbon in iPOC as a form of physical protection.展开更多
为进一步了解水稻土土壤微生物领域的研究进展和未来发展趋势,基于Web of Science数据库,采用文献计量学的分析方法,分析了2014-2023年水稻土土壤微生物领域文章。结果表明,2014-2023年全球范围内关于水稻土土壤微生物发表文章数量共计...为进一步了解水稻土土壤微生物领域的研究进展和未来发展趋势,基于Web of Science数据库,采用文献计量学的分析方法,分析了2014-2023年水稻土土壤微生物领域文章。结果表明,2014-2023年全球范围内关于水稻土土壤微生物发表文章数量共计768篇,其中美国、印度、中国发文量排在前3位;研究机构中法国国家科学研究中心位居首位,发文量达36篇;中国科学院位列第二,发文量为33篇。该领域研究论文主要发表在Frontiers in Microbiology、Microorganisms和Frontiers in Plant Science;研究学科包括微生物学、农学、分子生物学等相关学科。展开更多
基金funded by the National Key Research and Development Program of China (2021YFD1700200)the earmarked fund for China Agriculture Reserch System(CARS-22)the Natural Science Foundation of Jiangsu Province,China (BK20200112)。
文摘The co-utilization of green manure (GM) and rice straw (RS) in paddy fields has been widely applied as an effective practice in southern China.However,its effects on soil aggregate and soil organic carbon (SOC) stability remain unclear.In the present study,the effect of GM,RS,and co-utilization of GM and RS on particle size distribution of soil aggregates and SOC density fractions were measured in a field experiment.The experiment included six treatments,i.e.,winter fallow (WF) without RS return (Ctrl),WF with 50%RS return (1/2RS),WF with 100%RS return (RS),GM without RS return (GM),GM with 50%RS return (GM1/2RS) and GM with 100%RS return (GMRS).The results showed that the proportion of small macro-aggregates (0.25–2 mm) and the mean weight diameter (MWD) of aggregates in the GMRS treatment was greater (by 18.9 and 3.41%,respectively) than in the RS treatment,while the proportion of silt+clay particles (<0.053 mm) was lower (by 14.4%).The concentration of SOC in microaggregates (0.053–0.25 mm)and silt+clay particles was higher in the GMRS treatment than in GM and RS treatments individually.The concentration and proportion of free light organic carbon (fLOC) in aggregates of various particle sizes and bulk soil was greater in the GMRS treatment than the RS treatment,whereas the concentration and proportion of mineral-associated organic carbon in small macroaggregates,microaggregates,and bulk was lower in the GMRS treatment than in the RS treatment.The proportion of intra-aggregate particulate organic carbon (iPOC) was greater in the GMRS treatment than in GM treatment.The GMRS treatment had strong positive effects on iPOC in small macroaggregates,suggesting that SOC was transferred from fLOC to iPOC.In conclusion,co-utilizing green manure and rice straw cultivated the SOC pool by increasing the concentration of fLOC and improved soil carbon stability by promoting the sequestration of organic carbon in iPOC as a form of physical protection.
文摘为进一步了解水稻土土壤微生物领域的研究进展和未来发展趋势,基于Web of Science数据库,采用文献计量学的分析方法,分析了2014-2023年水稻土土壤微生物领域文章。结果表明,2014-2023年全球范围内关于水稻土土壤微生物发表文章数量共计768篇,其中美国、印度、中国发文量排在前3位;研究机构中法国国家科学研究中心位居首位,发文量达36篇;中国科学院位列第二,发文量为33篇。该领域研究论文主要发表在Frontiers in Microbiology、Microorganisms和Frontiers in Plant Science;研究学科包括微生物学、农学、分子生物学等相关学科。
