本文選題：熟化污泥 + 小麥　； 參考：《蘭州大學》2015年碩士論文

【摘要】：由于我國工業(yè)化的快速推進,污泥的產(chǎn)量也在與日俱增,如何合理地處置污泥也是當前國內(nèi)外的研究討論的焦點。污泥中含有豐富的有機質(zhì)與各類植物生長所需之養(yǎng)分,因此,土地利用是最為看好的城市污泥處置與資源化方式。本研究,針對干早區(qū)黃土—小麥系統(tǒng),設(shè)計科學、合理的盆栽試驗,模擬干旱區(qū)受不同程度Cd污染條件下施加不同比例(1.5%、3%)熟化污泥于黃土,探究其對小麥生長與吸收富集Cd之影響,為未來污泥土地施用提供參考。本試驗得出的主要結(jié)果如下：(1)隨著熟化污泥添加量的增加,土樣的pH值逐漸的降低,電導率、有機質(zhì)以及鎘的含量逐漸的升高,對鎘的吸附固定作用越強。有機質(zhì)成分是對試供土樣固定鎘的能力影響最大的因素。(2)Cd的脅迫會促進土壤中Cd的有效態(tài)分配系數(shù),從而促進植物的吸收,對植物存在威脅。但熟化污泥的添加,土壤中Cd的有效態(tài)分配系數(shù)降低,對土壤中Cd可起到一定的固定作用,主要原因是熟化污泥中有機質(zhì)含量豐富,易于形成有機態(tài)Cd,但仍存在一定危險,在一定條件下,有機態(tài)會被微生物分解而緩慢釋放到土壤中。(3)施用熟化污泥可以有效促進小麥地上部分的生長,并且3%污泥施加比例較1.5%更有利于促進小麥地上部分的生長,各部分促進程度：莖葉籽粒。與未施加污泥組相較,在S6水平并且施加3%污泥條件下,小麥株高最大增幅達到117%,在黃土中添加3%污泥并在S8(12mg/kg)水平下,小麥莖葉干重為9.757±0.353g,增長率最大約為336.75%,小麥籽粒干重為13.433±0.13g,增長率最大為2329.11%。(4)在低濃度Cd脅迫水平下(0-10mg/kg),施用熟化污泥可抑制小麥各部分對Cd的吸收作用。抑制程度：根籽莖葉。但當Cd濃度超過10mg/kg,熟化污泥的施用將對小麥帶來重金屬污染危害。(5)小麥各部位對Cd的富集能力為：根系莖葉籽粒,表明Cd更易從土壤系統(tǒng)進入植物系統(tǒng)并富集于小麥根部,而在籽粒中的富集則較少。污泥的施用在一定程度上抑制Cd在小麥各部分的富集,但影響并不顯著。同時,污泥的施用較大程度的促進了Cd從莖葉向籽粒的遷移,而對Cd從根向莖葉的遷移影響不顯著。
[Abstract]:Due to the rapid development of industrialization in China, sludge production is increasing day by day, and how to dispose sludge rationally is the focus of current domestic and international research and discussion. Sludge is rich in organic matter and nutrients needed for plant growth. Therefore, land use is the most promising way to dispose and recycle municipal sludge. In this study, a scientific and reasonable pot experiment was designed for the Loess wheat system in dry and early areas, and the sludge maturation in loess was simulated under different CD pollution conditions. The effects of CD on wheat growth and CD uptake were investigated to provide a reference for the application of sludge land in the future. The main results of this experiment are as follows: (1) with the increase of sludge addition, the pH value of soil samples decreases gradually, the conductivity, organic matter and cadmium content increase gradually, and the adsorption and fixation of cadmium is stronger. Organic matter is the most important factor affecting the ability of soil samples to immobilize cadmium. The stress of CD can promote the effective distribution coefficient of CD in soil, thus promote the uptake of CD by plants and threaten the plants. However, with the addition of matured sludge, the available distribution coefficient of CD in soil decreased, and CD in soil could be fixed to a certain extent. The main reason was that the organic matter in the sludge was rich in organic matter and it was easy to form organic CD, but there was still some danger. Under certain conditions, organic state will be decomposed by microorganism and released into soil slowly.) the application of matured sludge can effectively promote the growth of wheat aboveground part, and the application of 3% sludge is more favorable than 1.5% sludge to promote the growth of wheat aboveground part. Promote degree of each part: stem leaf grain. Compared with the untreated sludge group, under the condition of S6 and 3% sludge, the maximum increase of wheat plant height was 117g / kg, the addition of 3% sludge to loess and the addition of 12 mg / kg of sludge to the loess, The dry weight of stem and leaf of wheat was 9.757 鹵0.353 g, the maximum growth rate was 336.75 g, the dry weight of wheat grain was 13.433 鹵0.13 g, and the maximum growth rate was 2329.11.1 mg 路kg ~ (4) under low concentration of CD stress, the application of matured sludge could inhibit the absorption of CD by different parts of wheat. Inhibition degree: root seed stem and leaf. But when CD concentration is more than 10 mg / kg, the application of matured sludge will bring heavy metal pollution harm to wheat. The accumulation ability of CD in different parts of wheat is as follows: root, stem, leaf and grain, indicating that CD is more easily entered into plant system from soil system and enriched in wheat root. However, there was less enrichment in grain. The application of sludge inhibited the accumulation of CD in all parts of wheat to some extent, but the effect was not significant. At the same time, the application of sludge promoted the migration of CD from stem and leaf to grain to a large extent, but had no significant effect on the migration of CD from root to stem and leaf.
【學位授予單位】：蘭州大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：X53;X703

【共引文獻】

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