Biologically active soil organic carbon （BASOC） is an important fraction of soil organic carbon （SOC）, but our understanding of the correlation between BASOC and soil aggregate stability is limited. At an ecologic...Biologically active soil organic carbon （BASOC） is an important fraction of soil organic carbon （SOC）, but our understanding of the correlation between BASOC and soil aggregate stability is limited. At an ecological experimental station （28° 04＇-28° 37＇ N, 116° 41＇-117° 09＇ E） in Yujiang County, Jiangxi Province, China, we analyzed the dynamic relationship between soil aggregate stability and BASOC content over time in the red soil （Udic Ferrosols） fertilized with a nitrogen-phosphorus-potassium chemical fertilizer （NPK） without manure or with NPK plus livestock manure or green manure. The dynamics of BASOC was evaluated using CO2 efflux, and soil aggregates were separated according to size using a wet-sieving technique. The soils fertilized with NPK plus livestock manure had a significantly higher content of BASOC and an improved aggregate stability compared to the soils fertilized with NPK plus green manure or NPK alone. The BASOC contents in all fertilized soils decreased over time. The contents of large aggregates （800-2 000 μm） dramatically decreased over the first 7 d of incubation, but the contents of small aggregates （〈 800 μm） either remained the same or increased, depending on the incubation time and specific aggregate sizes. The aggregate stability did not differ significantly at the beginning and end of incubation, but the lowest stability in all fertilized soils occurred in the middle of the incubation, which implied that the soils had a strong resilience for aggregate stability. The change in BASOC content was only correlated with aggregate stability during the first 27 d of incubation.展开更多
Verb-argument relation is a very important aspect of syntax-semantics interaction in sentence processing. Previous ERP （event related potentials） studies in this field concentrated on the relation between the verb a...Verb-argument relation is a very important aspect of syntax-semantics interaction in sentence processing. Previous ERP （event related potentials） studies in this field concentrated on the relation between the verb and its core arguments. The present study aims to reveal the ERP pattern of Chinese applied object structures （AOSs）, in which a peripheral argument is promoted to occupy the position of the patient object, as compared with the patient object structures （POSs）. The ERP data were collected when participants were asked to perform acceptability judgments about Chinese phrases. The result shows that, similar to the previous studies of number-of-argument violations, Chinese AOSs show a bilaterally distributed N400 effect. But different from all the previous studies of verb-argument relations, Chinese AOSs demonstrate a sustained anterior positivity （SAP）. This SAP, which is very rare in the studies related to complexity of argument structure operation, reflects the integration difficulty of the newly promoted arguments and the progressive nature of well-formedness checking in the processing of Chinese AOSs which is in accordance with the metonymic mechanism of non- patient objects in the relevant cognitive study. It shows that, in Chinese, which is a paratactic language, semantics （thematic roles） plays a more important role in the syntax-semantics interface than that in hypotactic languages.展开更多
基金Supported by the National Natural Science Foundation of China (No.30971869)the Knowledge Innovation Program of the Chinese Academy of Sciences (No.KZCX2-YW-438-1)
文摘Biologically active soil organic carbon （BASOC） is an important fraction of soil organic carbon （SOC）, but our understanding of the correlation between BASOC and soil aggregate stability is limited. At an ecological experimental station （28° 04＇-28° 37＇ N, 116° 41＇-117° 09＇ E） in Yujiang County, Jiangxi Province, China, we analyzed the dynamic relationship between soil aggregate stability and BASOC content over time in the red soil （Udic Ferrosols） fertilized with a nitrogen-phosphorus-potassium chemical fertilizer （NPK） without manure or with NPK plus livestock manure or green manure. The dynamics of BASOC was evaluated using CO2 efflux, and soil aggregates were separated according to size using a wet-sieving technique. The soils fertilized with NPK plus livestock manure had a significantly higher content of BASOC and an improved aggregate stability compared to the soils fertilized with NPK plus green manure or NPK alone. The BASOC contents in all fertilized soils decreased over time. The contents of large aggregates （800-2 000 μm） dramatically decreased over the first 7 d of incubation, but the contents of small aggregates （〈 800 μm） either remained the same or increased, depending on the incubation time and specific aggregate sizes. The aggregate stability did not differ significantly at the beginning and end of incubation, but the lowest stability in all fertilized soils occurred in the middle of the incubation, which implied that the soils had a strong resilience for aggregate stability. The change in BASOC content was only correlated with aggregate stability during the first 27 d of incubation.
基金supported Beijing Social Science Fund Project(17YYB024)The Importation and Development of HighCaliber Talents Project (The Great Wall Scholar Program)of Beijing Municipal Institutions(CIT&TCD20150303)
文摘Verb-argument relation is a very important aspect of syntax-semantics interaction in sentence processing. Previous ERP （event related potentials） studies in this field concentrated on the relation between the verb and its core arguments. The present study aims to reveal the ERP pattern of Chinese applied object structures （AOSs）, in which a peripheral argument is promoted to occupy the position of the patient object, as compared with the patient object structures （POSs）. The ERP data were collected when participants were asked to perform acceptability judgments about Chinese phrases. The result shows that, similar to the previous studies of number-of-argument violations, Chinese AOSs show a bilaterally distributed N400 effect. But different from all the previous studies of verb-argument relations, Chinese AOSs demonstrate a sustained anterior positivity （SAP）. This SAP, which is very rare in the studies related to complexity of argument structure operation, reflects the integration difficulty of the newly promoted arguments and the progressive nature of well-formedness checking in the processing of Chinese AOSs which is in accordance with the metonymic mechanism of non- patient objects in the relevant cognitive study. It shows that, in Chinese, which is a paratactic language, semantics （thematic roles） plays a more important role in the syntax-semantics interface than that in hypotactic languages.
