20xx關(guān)于粉末狀石膏修復(fù)菱鎂礦土壤污染的研究精選(完整版)
【正文】 en et al., 2004） .但是聚丙烯酰胺的用量和使用方法需要嚴格操縱， 使用不當會增加水的粘性， 阻礙水流下滲， 進而降低土壤浸透速率 （Ajwa et al., 2006?？屯聊康氖歉纳仆寥乐墟V的空間分布、降低鎂含量， 減弱和消除對土壤的污染。 soil crust。向土柱中的土壤參加氧化鎂粉塵模仿自然條件下氧化鎂粉塵對土壤浸透速率阻礙；以石膏作為改良劑通過與氧化鎂粉塵及土壤混合調(diào)查石膏修復(fù)氧化鎂粉塵污染土壤的效果， 并用電鏡觀察石膏作用前后土壤外表形態(tài)變化。采納土柱淋洗方式在室內(nèi)模仿氧化鎂粉塵對土壤的浸透性阻礙及修復(fù)過程?！ ￡P(guān)鍵詞：菱鎂礦區(qū)； 土壤結(jié)皮； 浸透速率； 石膏； Experimental study on soil pollution and restoration in magnesite area Abstract:Magnesium oxide dusts produced during calcination fall to the soil surface and easily form magnesian soil crust in magnesite mining area, which would reduce soil porosity, weaken soil infiltration rate, and be harmful to soil quality. Using a soil column leaching device, an experiment was carried out to examine the influence of magnesium oxide dust on soil infiltration and the processes of soil remediation. Soil crust was formed by adding magnesium oxide dust to the soil column, gypsum was used as a modifier to inhibit the formation of crusts, and the morphological changes of soil crusts were observed by scanning electron microscope （ SEM） . The results showed that the control group after leaching for two times, the soil infiltration rate was stable at mmmin1. After adding magnesium oxide to the soil, the soil infiltration rate was significantly decreased to 0. 214 mm min1. When gypsum and magnesium oxide were bined added into soil column, the soil infiltration rate was stable at mmmin1 after leaching for two times, suggesting that the soil infiltration rate increased significantly after gypsum addition pared to that contaminated by magnesium oxide dust. The SEM diagram showed that the soil surface after adding gypsum exhibited a reticular structure and that the porosity and stability of the soil surface were improved, which would increase the permeability of the soil. Keyword:magnesite mining area。物理修復(fù)主要以更換土壤為主， 例如， 劉綺等 （1998） 建議客土、翻土等物理方法修復(fù)鎂質(zhì)污染土壤。聚丙烯酰胺被認為是良好的土壤改良劑， 大量研究說明， 聚丙烯酰胺能保持土壤的構(gòu)造防止分解， 提高土壤的浸透速率 （Ben et al., 1997。p H測試儀 （上海雷磁PHS3C酸度計） 清潔土壤樣品 試驗土壤樣品采自海城市梨樹村農(nóng)田土壤 （0~15 cm） 表層土， 將土壤樣品于室內(nèi)自然風干后過2 mm尼龍篩獲得小于2 mm的土壤顆粒備用， 測得土壤的理化性質(zhì)如表1所示?！ 〗Y(jié)果與分析 清潔土壤浸透速率變化規(guī)律 空白對照組土壤通過淋洗后浸透速率變化如圖1所示。隨著浸透時間的增加， mmmin1后下降速度變緩， ， 通過60
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