| Effect on soil active carbon and soil C pool manage ment i ndex of different tillages |
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| DOI：10.7606/j.issn.1000-7601.2008.06.02 |
| Key Words: tillage method total organic carbon active soil organic carbon carbon pool management index |
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| Abstract: |
| Based on the experi ment of 6-year conservation tillage in Dingxi specific semiarid areas in the Loess Plateau. The total organic carbon（TOC） and active soil organic carbon （ASOC） of different tillage methods were studied and the activity of carbon pool （A） activity index（AI） carbon pool index（CPI） carbon pool management index（CPMI） of different treat ments were calculated. The results showed that the contents of TOC and ASOCin no-till with straw mulching（NTS） conventional tillage with straw incorporated（TS） nontill without straw mulching（NT） were more than conventional tillage with no straw（T） and the contents of TOC and ASOC decreased with the soil depth. The percentage of ASOCin TOC was higher in NT NTS and TS than T in 0～5cmsoil layer especially in NTS. The result demonstrated that the activity of the carbon in soil of NTS was higher and could convert easily. Stubble return effect was more than tillage for mfor different soil C pool management index so stubble return was advantages to i mproving the soil C pool management index. |