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1.
Ying Yong Sheng Tai Xue Bao ; 26(7): 1961-8, 2015 Jul.
Artigo em Chinês | MEDLINE | ID: mdl-26710620

RESUMO

The characteristics and changes of soil organic carbon (SOC) and total nitrogen (TN) in different size particles of soil under different agricultural practices are the basis for better understanding soil carbon sequestration of mollisols. Based on a 31-year long-term field experiment located at the Heilongjiang Academy of Agricultural Sciences (Harbin) , soil samples under six treatments were separated by size-fractionation method to explore changes and distribution of SOC and TN in coarse sand, fine sand, silt and clay from the top layer (0-20 cm) and subsurface layer (20-40 cm). Results showed that long-term application of manure (M) increased the percentages of SOC and TN in coarse sand and clay size fractions. In the top layer, application of nitrogen, phosphorus and potassium fertilizers combined with manure (NPKM) increased the percentages of SOC and TN in coarse sand by 191.3% and 179.3% compared with the control (CK), whereas M application increased the percentages of SOC and TN in clay by 45% and 47% respectively. For subsurface layers, the increase rates of SOC and TN in corresponding parts were lower than that in top layer. In the surface and subsurface layers, the percentages of SOC storage in silt size fraction accounted for 42%-63% and 48%-54%, TN storage accounted for 34%-59% and 41%-47%, respectively. The enrichment factors of SOC and TN in coarse sand and clay fractions of surface layers increased significantly under the treatments with manure. The SOC and TN enrichment factors were highest in the NPKM, being 2.30 and 1.88, respectively, while that in the clay fraction changed little in the subsurface layer.


Assuntos
Agricultura , Carbono/química , Fertilizantes , Nitrogênio/química , Solo/química , Silicatos de Alumínio , Sequestro de Carbono , Argila , Esterco , Tamanho da Partícula , Fósforo , Potássio , Dióxido de Silício
2.
Ying Yong Sheng Tai Xue Bao ; 19(2): 369-73, 2008 Feb.
Artigo em Chinês | MEDLINE | ID: mdl-18464645

RESUMO

In this paper, black soil samples were separated into four sizes ( > 2,000, 2,000-250, 250-53, and <53 microm) of aggregates by wet sieving, and their free light fraction (free LF) and intra-aggregate particulate organic matter (iPOM) were isolated by density fractionation, aimed to evaluate the effects of manure application on the organic carbon in different sizes of aggregates in black soil. The results showed that compared with the control, applying manure improved soil aggregation significantly, and compensated the disturbance of tillage and slowed down the turnover of aggregates to some degree. After applying manure, the content of fine iPOM-C was significantly higher than that of coarse iPOM-C, suggesting that manure application was beneficial to the accumulation of fine iPOM-C, which is the main form of carbon sequestration in the aggregates of black soil.


Assuntos
Carbono/análise , Esterco , Compostos Orgânicos/análise , Solo/análise , Animais , Monitoramento Ambiental/métodos , Fertilizantes , Tamanho da Partícula
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