| 王晶,张仁陟,李爱宗.耕作方式对土壤活性有机碳和碳库管理指数的影响[J].干旱地区农业研究,2008,(6):8~12 |
| 耕作方式对土壤活性有机碳和碳库管理指数的影响 |
| 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 |
| 中文关键词: 耕作方式 总有机碳 活性有机碳 碳库管理指数 |
| 英文关键词:tillage method total organic carbon active soil organic carbon carbon pool management index |
| 基金项目:ACIAR资助(LWR2/1999/094)； 国家科技支撑计划(2006BAD15B06) |
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| 中文摘要: |
| 基于在黄土高原半干旱地区的典型代表—定西市安定区连续进行6 a的保护性耕作试验,研究了不同耕作方式对土壤总有机碳和活性有机碳的影响,并对各处理的碳库活度(A)、碳库活度指数(AI)、碳库指数(CPI)和土壤碳库管理指数(CMPI)进行了计算。结果表明:与传统耕作不覆盖(T)相比,免耕秸秆覆盖(NTS)、传统耕作结合秸秆还田(TS)和免耕不覆盖(NT)有利于土壤总有机碳含量和活性有机碳含量的提高,并且有随着土层深度的增加而递减的趋势;NT、NTS和TS有助于提高0～5 cm土层土壤活性有机碳占土壤总有机碳的百分率,尤以NTS处理的效果最为明显,说明NTS处理的土壤碳素活性大、易转化;对碳库各项管理指数来说,总体上秸秆覆盖或还田的贡献大于耕作措施,说明对土壤进行秸秆覆盖或还田有利于土壤碳库管理指数提高。 |
| 英文摘要: |
| 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. |
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