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首页> 外文期刊>Canadian Journal of Soil Science >Effects of 49 years of fertilization on the distribution and accumulation of soil carbon under corn cultivation.
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Effects of 49 years of fertilization on the distribution and accumulation of soil carbon under corn cultivation.

机译:玉米栽培49年施肥对土壤碳分布和累积的影响。

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摘要

The effects of 49 yr of monoculture corn (Zea mays L.) production with/without chemical fertilizer addition on the origin and distribution of soil organic carbon (C) among the sand (53-2000 micro m), silt (2-53 micro m), and clay (<2 micro m) particle size fractions in the top 20 cm of a clay loam soil were evaluated using the carbon-13 isotope abundance technique. The C derived from corn (newly formed C4-plant C) was greater under chemical fertilization relative to no fertilization in all three size fractions. However, the resident (old) C derived from C3-plants grown prior to corn was similar between the fertilized and unfertilized treatments for each size fraction. Fertilization of monoculture corn had little impact on the amount of native-formed C3-plant C, particularly in the silt and clay fractions, but did increase the amount of newly formed C4-plant C.
机译:添加或不添加化肥的49年单季种植玉米(Zea mays L.)对沙土(53-2000 microm),粉砂(2-53 micron)中土壤有机碳(C)的来源和分布的影响m),并使用碳13同位素丰度技术评估了粘土壤土顶部20 cm中的粘土(<2微米)粒径分数。在化学施肥条件下,相对于所有三个大小部分均未施肥,来自玉米的碳(新形成的C4植物C)要大。但是,对于每个大小部分,在施肥和未施肥处理之间,来源于玉米之前生长的C3植物的常驻(老)碳相似。单作玉米的施肥对天然形成的C3植物C的量影响不大,特别是在淤泥和粘土部分,但确实增加了新形成的C4植物C的量。

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