本文關(guān)鍵詞： 碳調(diào)節(jié)劑 次生鹽漬化 可溶性鹽 氮　出處：《揚(yáng)州大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：論文采用田間取樣分析和室內(nèi)盆缽培養(yǎng)相結(jié)合的方式,研究碳調(diào)節(jié)劑(小麥秸稈+快腐解菌)在次生鹽漬化土壤中的使用效果及其對土壤中氮素形態(tài)轉(zhuǎn)化的影響。通過對次生鹽漬化土壤不同深度可浴性鹽進(jìn)行調(diào)查,研究可溶性鹽組分特點和空間分布情況,為次生鹽漬化土壤改良提供依據(jù)；同時通過向次生鹽漬化土壤添加不同用量的碳調(diào)節(jié)劑,研究碳調(diào)節(jié)劑降低次生鹽漬化土壤中可溶性鹽含量的效果及其對土壤中氮素形態(tài)轉(zhuǎn)化的影響,得到主要結(jié)果如下：(1)試驗地土壤可溶性鹽分離子主要為Ca2+和N03-,分別占陽離子和陰離子總量的59.71%和65.95%,且主要集中在表層0-10cm。(2)無論是短期培養(yǎng)或長期培養(yǎng),加入碳調(diào)節(jié)劑均可明顯降低土壤溶液中可溶性鹽的濃度,在一定范圍內(nèi),降低幅度隨碳調(diào)節(jié)劑加入量的增加而增加,本實驗條件下最多可在原有濃度上降低33.95%。(3)加入碳調(diào)節(jié)劑可提高土壤pH值,大幅增加土壤有機(jī)質(zhì)和速效鉀含量,對速效磷也有一定的補(bǔ)充；這些養(yǎng)分因子所發(fā)生的改變總體上有利于土壤性質(zhì)向好的方向發(fā)展。(4)加入碳調(diào)節(jié)劑可明顯提高設(shè)施土壤中酸溶性全氮的含量,實驗條件下最多可在原有濃度上提高42.26%；添加碳調(diào)節(jié)劑后,土壤微生物氮含量均顯著增加,并隨著碳調(diào)節(jié)劑添加量的增加而呈先增加后下降的趨勢。(5)小白菜試驗表明,在土壤中加入碳調(diào)節(jié)劑有利于改善小白菜生長,綜合出苗率、根尖數(shù)、根長、根表面積、根體積和平均根直徑6項指標(biāo),碳調(diào)節(jié)劑用量為40g/kg(T4)處理最佳。綜合考慮碳調(diào)節(jié)劑對土壤可溶性鹽分含量、氮素形態(tài)轉(zhuǎn)化及其他理化性質(zhì)以及小白菜的生長情況的影響,碳調(diào)節(jié)劑推薦用量為40g/kg(T4)。但由于本試驗采用的是室內(nèi)盆缽試驗,該推薦用量是否符合大棚的實際生產(chǎn)還有待進(jìn)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.
【學(xué)位授予單位】：揚(yáng)州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：S156.4

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