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      2. 土壤酸化影響櫻桃番茄養分積累和分配
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        華中農業大學

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        S641.2

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        國家現代柑橘產業技術體系養分管理與化肥減施增效崗位


        Soil acidification affected nutrients accumulation and distribution in Cherry tomato
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          摘要:

          當前土壤酸化加劇,而土壤酸化對作物養分積累和分配的影響仍不十分清楚。研究揭示土壤酸化對土壤養分有效性和植物吸收、積累、分配養分的影響,為酸化土壤治理尤其是養分高效利用提供依據。采用盆栽試驗,以酸性紅壤(pH 5.05)、櫻桃番茄(Lycopersivon esculentum Mill) 為試驗材料,采用檸檬酸-磷酸氫二鈉緩沖液和碳酸鈉-碳酸氫鈉緩沖液調節土壤pH,使土壤pH下調至4.0,5.0及上調至6.0和7.0,試驗共4個處理,每處理5個重復。結果表明,通過緩沖液調節,實測土壤pH為4.35、4.92、5.89、6.85,分別下調0.70、0.13及上調0.84和1.80個pH單位。土壤酸化顯著降低櫻桃番茄葉面積、生物量尤其是根系生物量,降低植株根冠比;土壤酸化嚴重抑制氮、磷、鉀、鎂、鐵在番茄根系的累積,而促進鐵、錳在莖稈和鈣、鎂在葉片的累積分配,使根系氮、磷、鉀、鈣、鎂、鐵積累量顯著降低,莖稈積累氮、鉀、鐵、錳較多,葉片積累磷、鈣、鎂較多,特別是植株各部位錳含量顯著提高。由此說明,根系是番茄植株受土壤酸化抑制最嚴重、最敏感的部位,并因此導致多數養分被根系吸收、遷移受阻而積累顯著下降。

          Abstract:

          Soil acidification is currently increasing, but how does soil acidification affect nutrients distribution and accumulation in plant is still not clear. Effects of soil acidification or pH on soil nutrient availability, nutrients concentration and accumulation, migration and distribution in plant were measured, with aim to utilize acidic soil and its nutrients efficiently. Pot experiment was conducted with acidic red soil (pH 5.05) and Cherry tomatoes (Lycopersivon esculentum Mill) as test materials, the soil pH was adjusted with citric acid-sodium hydrogen phosphate buffer and sodium carbonate-sodium bicarbonate buffer to adjust soil pH to 4.0,5.0,6.0 and 7.0. There were 4 treatments in total, with 5 replicates for each treatment. The result shows that measured soil pH were 4.35, 4.92, 5.89, 6.85, respectively, adjusted down by 0.70, 0.13 and increased by 0.84 and 1.80 pH. Soil acidification significantly reduced the leaf area and biomass of Cherry tomato, especially the root biomass,and root to shoot ratio. Soil acidification severely inhibited the accumulation of N, P, K, Mg and Fe in roots, promoted the accumulation and distribution of Fe and Mn in stem, and Ca and Mg in leaves. Significantly decreased N, P, K, Ca, Mg and Fe accumulations and its proportion to total in root, with more N, K, Fe and Mn accumulated in stems, more P, Ca and Mg accumulated in leaves, particularly raised all whole plant Mn concentrations significantly. It concluded that the root was the most severe and sensitive part of whole tomato plant inhibited by soil acidification, as a result, most nutrients were absorbed by the roots, migration were blocked, and accumulation was significantly reduced.

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        歷史
        • 收稿日期:2020-05-20
        • 最后修改日期:2020-10-08
        • 錄用日期:2020-10-09
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