| 田间增强UV-B辐射对麦田生态系统Fe营养和累积的影响 |
| 摘要点击 1422 全文点击 1447 投稿时间：1999-04-26 |
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| 中文关键词 UV-B辐射 麦田生态系统 Fe 营养 累积 |
| 英文关键词 UV B radiation, wheat field ecosystem, Fe, nutrients, accumulation. |
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| 中文摘要 |
| 研究大田栽培和自然光条件下，模拟ＵＶ－Ｂ辐射（ＵＶ－Ｂ，２８０ｎｍ ～３１５ｎｍ ）增强对麦田生态系统Ｆｅ营养和累积的影响．在４ 个生育期中，ＵＶ－Ｂ辐射显著增加叶和穗Ｆｅ含量，显著降低根Ｆｅ 含量，并改变茎Ｆｅ 含量．叶Ｆｅ累积对ＵＶ－Ｂ辐射的响应有明显的生育期之间的差异． 分蘖期无显著变化，拔节期和扬花期显著增加，而成熟期显著降低．在各生育期，ＵＶ－Ｂ辐射显著降低叶、根和穗Ｆｅ累积．ＵＶ－Ｂ辐射显著降低春小麦不同生育期Ｆｅ总累积，在５．３１ｋＪ·ｍ-2 ＵＶ－Ｂ辐射下，降低最显著．ＵＶ－Ｂ辐射还降低春小麦群体Ｆｅ输出．麦田土壤速效Ｆｅ含量增加是春小麦群体Ｆｅ输出降低的结果，可能导致土壤库中Ｆｅ 储量的增加． |
| 英文摘要 |
| Influences of enhanced ultraviolet radiation (UV B, 280～315nm) on nutrients and accumulation of Fe of wheat field ecosystem were investigated under field conditions. UV B radiation increased significantly Fe concentrations in leaves and spikes, decreased significantly Fe concentrations in roots, and changed Fe concentrations in stems at various developmental stages. The responses of Fe accumulation in leaves to UV B radiation were different among developmental stages, it had no changed significantly at tillering stage, increased significantly at stages of elongation and flowering, and decreased significantly at ripening stage. At various developmental stages, UV B radiation decreased significantly Fe accumulation in stems, roots and spikes. UV B radiation decreased significantly Fe accumulation in whole plants at various developmental stages, 5.31 kJ·m-2 UV B radiation had the greatest decrease. UV B radiation reduced Fe output of spring wheat colonies. Increases in concentrations of available Fe in soil were the results of decreases in Fe output of spring wheat colonies, might lead to occur higher Fe storage in soil. |
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