| 生物炭输入对土壤本体有机碳矿化的影响 |
| 摘要点击 3232 全文点击 1345 投稿时间：2014-10-16 修订日期：2015-01-06 |
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| 中文关键词 生物炭 水洗处理 土壤有机碳 CO2释放 δ13C |
| 英文关键词 biochar washing treatments soil organic carbon CO2 cumulative release δ13C |
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| 中文摘要 |
| 近年来,生物炭应用于土壤后其碳汇能力已成为国内外的研究热点,但是目前研究结果显示其碳汇功能仍然存在争议,生物炭与土壤本体有机碳之间的作用关系还有待探明. 研究以水稻土(C3土壤)为供试土壤,向其中添加以水洗(CS)和未水洗(CN)方式处理的玉米(C4作物)秸秆生物炭,生物炭分别按1%和3%(CS1%、CS3%和CN1%、CN3%)的质量比与C3土壤均匀混合,以不添加生物炭(CK)为对照处理,每个处理重复3次,开展室内培养实验,探讨生物炭添加对土壤有机碳矿化的影响. 结果表明:①在180 d的培养期内,CS1%、CS3%、CN1%这3种处理的土壤CO2累计释放量分别为1865.7、1864.4和1856.2 mL·kg-1,均高于对照土壤CK的1779.0 mL·kg-1,但未形成显著差异. 处理CN3%的CO2累计释放量最大,为2289.1 mL·kg-1,明显高于其他处理及对照土壤. 说明较高添加量下,水洗生物炭 CS处理减排效果明显; ②同位素分析结果显示,CK处理土壤的本体有机碳的CO2累计释放量最高,达到1534.2 mL·kg-1,CS3%与CN3%处理土壤本体有机碳的CO2累计释放量分别为1000.4 mL·kg-1和1153.7 mL·kg-1,均明显低于对照处理,说明2种生物炭的添加均能抑制土壤本体有机碳的矿化. 激发效应的结果也验证了这一点,CS3%处理土壤的激发效应PE值为-34.8%,处理CN3%的PE值为-24.8%,CS生物炭的负激发效应更显著. |
| 英文摘要 |
| Since the biochar was applied in soil, its function in carbon sink had become a research hotspot recently. However, the present studies showed that its function in carbon sink remained controversial and the interaction between biochar and soil organic carbon remained to be investigated. So our study used paddy soil (C3 soil) as the experimental soil, and added washed(CS) or unwashed(CN) corn stalk(C4 crop).Biochar was mixed with soil uniformity by two kinds of weight, each treatment was 1% and 3% of the soil (CS1%, CS3% and CN1%, CN3%). Soil without biochar was used as the control treatment(CK),every treatments repeated three times. Then indoor culturing experiments was carried out to study the effect of biochar on the mineralization of organic carbon. The results showed as follows: ① During the 180 days' experiment, the accumulated amount of released CO2 in CS1%, CS3% and CN1%groups were 1865.7, 1864.4 and 1856.2 mL·kg-1 respectively, all were higher than the CK (1779.0 mL·kg-1). But the differences were not significant. However, the accumulated amount of released CO2 in the CN3% group was the highest (2289.1 mL·kg-1), which was significantly higher than those of all other groups. This showed that high addition of CS biochar significantly reduced the soil CO2 release. ② The accumulated amount of released CO2 of native soil from the CK treatment, CS treatment and CN treatment were 1534.2, 1000.4 and 1153.7 mL·kg-1 respectively, among which the CK group is significantly higher than the others. It showed that additions of two kinds of biochar both could inhibit the mineralization of organic carbon in the soil. The result of priming effect also proved that: the PE value of CS 3% group was -34.8%, and the PE value of CN 3% group was -24.8%. This showed that the negative priming effect significantly induced by washed(CS) biochar. |
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