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- W2378605428 abstract "【Objective】To study the effect of long- term different carbon inputs on soil organic carbon( SOC),soil microbial carbon( SMBC) and soil microbial quotient carbon( the ratio of SMBC and SOC).【Method】Based on a 22- year( 1990- 2011) long- term fertilization experiment in northwest China,we investigated dynamics of SMBC and q SMBC during the growing period of winter wheat,the relationships between the SMBC,q SMBC,soil organic carbon( SOC) concentrations and the carbon input and grain yield of wheatwere also analysed. Fertilization treatments were( 1) unfertilized control( Control),( 2) chemical nitrogen plus phosphate plus potassium( NPK),( 3) NPK plus animal manure( NPKM),( 4) 2 time NPKM( h NPKM),( 5) NPK plus straw( NPKS). 【Result】Results showed that the SMBC and q SMBC were significantly different between returning,jointing,flowering and harvest stage of wheat under long- term fertilization,and the largest values were observed in the flowering stage of wheat. Values for SMBC and q SMBC ranged from 37. 5 to 106. 0 mg / kg and 0. 41% to 0. 61%,respectively. The mean value rank( from high to low) of SMBC during the whole growing period of wheat was h NPKM,NPKM,NPKS,CK,NPK. But there were no statistically significant differences between h NPKM and NPKM,or between the control and NPK. The order for q SMBC( from high to low) is NPKS,NPKM,CK,h NPKM,NPK. 【Conclusion】These results indicate that NPKS significantly increased the ratio of SMBC to SOC,i. e.,q SMBC,compared with NPK fertilizer or other two NPKM fertilizations. Significant linear relationships were observed between the annual carbon input and SOC( P 0. 01) or SMBC( P 0. 05),and between the relative grain yield of wheat and the SOC content( P 0. 05) of grey desert soil,while the q SMBC was not correlated with the annual carbon input.Our study indicated the combined application of chemical fertilizer and manure or straw is the most effective agricultural practice than the long- term application of sole chemical fertilizer in order to increase SOC and to improve soil quality." @default.
- W2378605428 created "2016-06-24" @default.
- W2378605428 creator A5057742427 @default.
- W2378605428 date "2014-01-01" @default.
- W2378605428 modified "2023-09-26" @default.
- W2378605428 title "The Relationship between Long-term Carbon Input and Microbial Quotient in Grey Desert Soil of Cropland" @default.
- W2378605428 hasPublicationYear "2014" @default.
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