关键词: 腐熟秸秆, 土壤理化性质, 酶活性

Abstract: In order to explore the influence of rotten straw on soil physical and chemical properties and enzyme activity, this paper studied the effects of rotten straw with different gradients on volume-weight, moisture content, available nutrient and enzyme activity of tobacco-planting soil by field experiments. The results showed that: ① Rotten straw had remarkable effects on decreasing soil volume-weight and increasing soil moisture content. At 30 d after transplanting, soil volume-weight of T3 treatment reached the lowest value of 1.07 g/cm3, 13.01% lower than that of the contrast. ② With the increasing of rotten straw dosage, the supply of alkali-hydrolysable, available phosphorus, available potassium in tobacco-planting soil were significantly increased. Among them, the effects of T2 and T3 were espcially better than that of the contrast. ③ Rotten straw could improve the activities of urease, cellulase, sucrase, catalase of tobacco-planting soil. At 45 d, the soil urease activity reached the maximum value, and the urease activities of T2 and T3 increased by 26.29% and 21.86% than that of the contrast, respectively. At 30 d, cellulase activity reached the maximum value, the cellulase activities of T2 and T3 increased by 132.67% and 111.83% than that of the contrast, respectively. At 60 d, the soil sucrase activity reached the maximum value, and soil sucrase activity of T3 increased by 29.23% than that of the contrast. At 45 d, the soil catalase activity reached the maximum value, and soil catalase activity of T3 increased by 25.71% than that of the contrast. Taken together, applying rotten straw was helpful for improving physical and chemical properties, increasing soil fertility and strengthening enzyme activity of tobacco-planted soil. T3 (11 250 kg/hm2) clould be used as a reference quantity of rotten straw in tobacco-growing areas of Henan province.

Key words: rotten straw, soil physical and chemical property, enzyme activity