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为评价赤红壤酸铝对作物的毒害作用,本文用氧化钙和硫酸铝将典型赤红壤pH值调节为4.01、4.52、5.02、5.52,研究了7种作物对不同酸铝土壤的响应。结果表明,不同酸铝土壤中,7种作物相对根长与相对根干重呈相似变化趋势,均表现为pH 5.02土壤>pH 4.52土壤>pH 4.01土壤,水稻的相对根长与相对根干重较大,而大麦较小,通菜、玉米、菜豆、豆角、大豆位于其中。铝溶液处理下不同作物的相对根伸长均以水稻、大豆、菜豆、豆角>玉米>通菜>大麦,与土培结果基本一致;作物根系的苏木精染色程度随酸铝毒害程度的上升而加深,与作物铝吸收结果趋势相同。大麦、水稻、豆角染色较深,但其相对根长差异显著,表明它们具有不同的耐铝机制。
In order to evaluate the toxic effects of acid and chromonitrate on crops, the pH values of typical latosolic red soils were adjusted to 4.01, 4.52, 5.02 and 5.52 with calcium oxide and aluminum sulfate. The responses of seven crops to different acid-aluminum soils were studied. The results showed that the relative root length and relative root dry weight of 7 kinds of crops showed the same trend in different acid-aluminum soils, which showed that the relative root length and relative root dry weight of soil under pH 5.02 soil> pH 4.52 soil> pH 4.01 soil, Larger, while smaller barley, Tung Chai, corn, beans, beans, soybeans in which. The relative root elongation of different crops under the aluminum solution treatment was basically consistent with that of the soil culture with rice, soybean, kidney bean, bean> corn> Tung Cai> barley. The root hematoxylin staining increased with the increase of acid-aluminum toxicity And deepen, with the same trend of crop aluminum absorption. Barley, rice and beans were deeply stained, but their relative root length was significantly different, indicating that they had different mechanisms of aluminum tolerance.