碳调节剂在次生盐渍化土壤中的使用效果及对氮素形态的影响研究

发布时间：2018-02-04 20:40

本文关键词： 碳调节剂次生盐渍化可溶性盐氮　出处：《扬州大学》2016年硕士论文　论文类型：学位论文

【摘要】：论文采用田间取样分析和室内盆钵培养相结合的方式,研究碳调节剂(小麦秸秆+快腐解菌)在次生盐渍化土壤中的使用效果及其对土壤中氮素形态转化的影响。通过对次生盐渍化土壤不同深度可浴性盐进行调查,研究可溶性盐组分特点和空间分布情况,为次生盐渍化土壤改良提供依据；同时通过向次生盐渍化土壤添加不同用量的碳调节剂,研究碳调节剂降低次生盐渍化土壤中可溶性盐含量的效果及其对土壤中氮素形态转化的影响,得到主要结果如下：(1)试验地土壤可溶性盐分离子主要为Ca2+和N03-,分别占阳离子和阴离子总量的59.71%和65.95%,且主要集中在表层0-10cm。(2)无论是短期培养或长期培养,加入碳调节剂均可明显降低土壤溶液中可溶性盐的浓度,在一定范围内,降低幅度随碳调节剂加入量的增加而增加,本实验条件下最多可在原有浓度上降低33.95%。(3)加入碳调节剂可提高土壤pH值,大幅增加土壤有机质和速效钾含量,对速效磷也有一定的补充；这些养分因子所发生的改变总体上有利于土壤性质向好的方向发展。(4)加入碳调节剂可明显提高设施土壤中酸溶性全氮的含量,实验条件下最多可在原有浓度上提高42.26%；添加碳调节剂后,土壤微生物氮含量均显著增加,并随着碳调节剂添加量的增加而呈先增加后下降的趋势。(5)小白菜试验表明,在土壤中加入碳调节剂有利于改善小白菜生长,综合出苗率、根尖数、根长、根表面积、根体积和平均根直径6项指标,碳调节剂用量为40g/kg(T4)处理最佳。综合考虑碳调节剂对土壤可溶性盐分含量、氮素形态转化及其他理化性质以及小白菜的生长情况的影响,碳调节剂推荐用量为40g/kg(T4)。但由于本试验采用的是室内盆钵试验,该推荐用量是否符合大棚的实际生产还有待进一步研究。
[Abstract]:The method of field sampling and pot culture was used in this paper. The effects of carbon regulator (wheat straw fast decomposing bacteria) on nitrogen transformation in secondary salinized soil were studied. The characteristics and spatial distribution of soluble salt were studied to provide the basis for the improvement of secondary salinization soil. At the same time, by adding different amount of carbon regulator to secondary salinization soil, the effect of carbon regulator on reducing soluble salt content in secondary salinized soil and its effect on nitrogen form transformation in secondary salinization soil were studied. The main results were as follows: (1) the main soluble salt ions in the soil were Ca2 and N03-which accounted for 59.71% and 65.95% of the total amount of cations and anions, respectively. The concentration of soluble salt in soil solution can be significantly reduced by adding carbon regulator to the soil solution in a certain range, whether in short or long term culture. The reduction range increased with the increase of the amount of carbon regulator. Under the condition of this experiment, the original concentration of carbon regulator could be reduced by 33.95%. 3) the addition of carbon regulator could increase the pH value of soil. The content of organic matter and available potassium in soil was increased significantly, and the available phosphorus was supplemented to some extent. The change of these nutrient factors was beneficial to the development of soil properties. (4) addition of carbon regulator could obviously increase the content of acid soluble total nitrogen in the soil. Under the experimental conditions, the original concentration can be increased by 42.26 at most. Soil microbial nitrogen content increased significantly after the addition of carbon regulator, and increased first and then decreased with the increase of carbon regulator content. The addition of carbon regulator to the soil can improve the growth of pakchoi, including seedling emergence rate, root tip number, root length, root surface area, root volume and mean root diameter. The effect of carbon regulator on soil soluble salt content, nitrogen form transformation and other physical and chemical properties and growth of pakchoi was considered. The recommended dosage of carbon regulator is 40 g / kg 路kg ~ (4) 路m ~ (-1). However, as the experiment is an indoor pot test, whether the recommended amount is in line with the actual production of greenhouse is still to be further studied.
【学位授予单位】：扬州大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：S156.4

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