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1.随着废水灌溉进入土壤中的物质除氮素外,还有酚和硫化物等有害物质。2.土壤溶液中酚和硫化物的含量随废水灌溉年限的增长而增高,其绝对含量受土壤质地的制约,质地粘的虽灌溉年限不长积累量亦高,如灌溉12年的粘壤质泛濫地草甸土,其酚和硫化物的含量比灌溉20年的砂壤质泛滥地草甸土高。3.灌废水的土壤中酚细菌的含量明显地比灌清水的为高,其数量既有随灌溉年限增长而增加的趋势,同时又受土壤质地的影响,质地粘的含量较高,砂的较低。酚细菌的含量与酚的含量成正相关,说明酚的存在给酚细菌的活动提供了物质基础,酚细菌的积极活动可能是酚在土壤中的年积累量不多的主要原因。4.在50厘米土层内腐殖质和氮的含量,灌废水的土壤比灌清水的高15—53%。显然,利用废水灌溉有助于腐殖质的积累。在水稻生长期,废水灌溉的土壤中活性胡敏酸含量较清水灌溉的为高的事实说明,随废水灌溉进入土壤中的有机物——可能是酚类化合物的氧化产物醌类,在一定条件下参与了腐殖质的形成。5.盆钵试验证明,历年用废水灌溉的土壤,水稻产量均比灌清水的高,其中灌溉年限为12年的最高,20年的其次,3年的再其次。所有供试土壤继续用废水灌溉的都比改用清水灌溉的产量显著提高。这表明,即使連续用废水灌溉稻田达20年之久,对土壤性质亦无不良的影响,且仍有提高土壤肥力的作用。6.废水中虽同时含有大量对作物生长有利和有害的物质,但由于土壤本身具有较大的生物活性和缓冲作用,因而消除或缓和了有害物质的为害,发挥了有益物质的作用,提高了土壤肥力,导致作物明显的增产。
1. With the wastewater irrigation into the soil of the material in addition to nitrogen, there are phenols and sulfides and other harmful substances. The content of phenol and sulfide in soil solution increased with the increase of wastewater irrigation years, and its absolute content was controlled by the soil texture. The sticky texture did not accumulate for a long time, Overland meadow soil has higher levels of phenols and sulfides than sandy soils flooded with sandy loam for 20 years. 3. The content of phenolic bacteria in the wastewater was obviously higher than that of the irrigation water, and the quantity of the bacteria increased with the increase of the irrigation years. At the same time, the content of the phenolic bacteria in the soil was higher due to the soil texture, Lower. The content of phenol and bacteria is positively correlated with the content of phenol, indicating that the presence of phenol provides the material basis for the activity of phenol bacteria. The positive activity of phenol bacteria may be the main reason that the accumulation of phenol in soil is small. 4. In the 50 cm soil layer, the content of humus and nitrogen in soil is 15-53% higher than the irrigation water. Obviously, the use of wastewater irrigation contribute to the accumulation of humus. The fact that the active humic acid content of soil irrigated with waste water is higher than that of fresh water irrigated during the growing season of rice shows that organic matter entering the soil with wastewater irrigation may be the quinone of the oxidation products of phenolic compounds. Under certain conditions Participated in the formation of humus. The pot experiment showed that the yield of rice irrigated with waste water was higher than that of irrigated water over the years, of which the irrigating period was the highest in 12 years, followed by 20 years and then in 3 years. All of the tested soils were still significantly irrigated with waste water rather than irrigated with clear water. This shows that even continuous irrigation of paddy fields with waste water for 20 years has no adverse effect on soil properties and there is still an effect of increasing soil fertility. Although the waste water contains a large number of substances that are beneficial and harmful to crop growth at the same time, the soil itself has greater biological activity and buffering effect, thus eliminating or mitigating the harmful substances and playing a beneficial role in the crop so as to improve Soil fertility results in a significant increase in crop yield.