| Effect of long-term fertilization on soil organic carbon and its fractions under dryland farming system |
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| DOI：10.7606/j.issn.1000-7601.2017.01.15 |
| Key Words: Long-term fertilization soil organic carbon potential carbon mineralization microbial biomass carbon carbon management index |
| Author Name | Affiliation | | ZHAO Dan-dan | College of Urban and Environmental Sciences, Northwest University, Xi'an, Shaanxi 710127, China | | WANG Jun | College of Urban and Environmental Sciences, Northwest University, Xi'an, Shaanxi 710127, China | | FU Xin | College of Urban and Environmental Sciences, Northwest University, Xi'an, Shaanxi 710127, China |
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| Abstract: |
| A long-term winter wheat field experiment was conducted to detect the effect of long-term fertilization on soil organic carbon and its active fractions. Four treatments were performed as control treatment (CK), nitrogen and phosphorus combined fertilization (NP), nitrogen, phosphorus and manure combined fertilization (NPM) and bare land without fertilization and cropping (BL). The results showed that the contents of soil organic carbon content, microbial biomass carbon content, potential mineralized carbon and carbon management index at 0～30 cm soil layers were improved in NPM than in CK after 30-year continuous fertilization, being 42.2%、55.9%、40.9% and 40.0% higher, respectively. No significant difference in soil organic carbon and microbial biomass carbon were found between NP and CK, howerver, the potential mineralized carbon content and carbon management index were significantly higher in NP than in CK. The effect of long term fertilization on soil active organic carbon fractions was more obvious at 15～30 cm soil layers than at 0～15 cm layers. No cropping reduced the contents of soil organic carbon and its fractions significantly. Soil carbon potential mineralization was lower by 20.5% in BL than in CK, respectively. Correlation analysis showed that soil organic carbon, potential mineralization carbon, microbial biomass carbon and carbon management index correlated with each other significantly. Soil organic carbon changed in agreement with its fractions for all treatments except for NP, and the relative contents of two active organic carbon and its potential mineralization ratio of microbial biomass carbon were not significant among treatments. In general, continuous long-term manure addition can effectively increase soil organic carbon and its active fractions, contributing to soil fertility and carbon sequestration under dryland farming systems. |
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