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为探索稻草还田短期内土壤有机酸积累和养分供应特征,在温室培养条件下,采用多孔聚酯管溶液采集器采集土壤溶液和“通用佳”离子交换树脂球法,分别研究了连续淹水和干湿交替下,施用稻草30天内对土壤有机酸产生和养分有效性的影响。结果表明,(1)无论连续淹水还是干湿交替,施用稻草后土壤中有机酸积累明显增加,但在干湿交替下的积累要低于连续淹水下;施用稻草后产生的有机酸以乙酸为主,且5cm处的有机酸积累明显低于15cm处。(2)施用稻草降低了土壤氮的有效性,但提高了土壤磷、铁、钾、钙和镁的有效性;与连续淹水相比,干湿交替下施用稻草降低土壤氮有效性的程度更大,而提高土壤磷、铁、钾、钙、镁的程度则较小。
In order to explore the characteristics of soil organic acid accumulation and nutrient supply in the short term after rice straw was returned to field, the porous polyester pipette was used to collect the soil solution and the “Universal” ion exchange resin ball method. Effects of flooding and alternate wetting and drying on the production of organic acids and their nutrient availability within 30 days of applying straw. The results showed that: (1) The accumulation of organic acids in soil increased obviously under continuous or wet-dry alternation, irrespective of continuous flooding or alternation of dry and wet conditions. However, Acetic acid, and organic acid accumulation at 5cm was significantly lower than 15cm. (2) The application of straw reduced the availability of soil nitrogen, but increased the availability of soil phosphorus, iron, potassium, calcium and magnesium. Compared with continuous flooding, the degree of soil nitrogen availability decreased with the application of straw Larger, while increasing the soil phosphorus, iron, potassium, calcium, magnesium degree is smaller.