Effects of soil moisture, depth, and organic amendments on selenium volatilization
Effects of soil moisture, depth, and organic amendments on selenium volatilization
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土壤湿度、深度和有机改良剂对硒挥发的影响
DOI：
10.2134/jeq1999.00472425002800040037x
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发表时间：
1999
影响因子：
2.4
通讯作者：
W. Frankenberger
中科院分区：
文献类型：
--
作者：
Yiqiang Zhang;W. Frankenberger
通过三个不同的试验，研究了土壤水分、土壤深度和有机改良剂对硒污染土壤中硒挥发的影响。结果表明，从风干土壤(<；2μg/m2/d)向湿润土壤(185μg/m2/d)的过渡过程中，土壤中Se的挥发速率明显增加，风干土壤复湿后的挥发速率远高于土壤持续湿润后的挥发速率。虽然随着土壤质量的增加，DMSE的生成量增加，但DMSE仍被困在下层土壤中。向空气中排放的DMSE与水分含量有关。10d后，风干土壤和饱和土壤中分别有96%和14%的DMSE挥发到空气中。不溶性(酪蛋白)和可溶性(添加卡萨米诺)有机改良剂均可通过挥发作用促进DMSE的产生和从土壤中去除。这项研究表明，需要有机改良剂和频繁耕作，通过增加DMSE的产量和增加土壤孔隙度来增加土壤中Se的挥发，从而促进DMSE向大气的扩散。
Effects of soil moisture, depth, and organic amendments on selenium (Se) volatilization in a Se-contaminated soil were studied in three different experiments. Results showed that the volatilization rate of Se as dimethylselenide (DMSe) was increased during a transition from air-dry soil (<2 μg/m 2 per day) to a wetted soil (185 μg/ m 2 per day), and was also much higher after rewetting an air-dried soil than keeping the soil continuously moist. Although more DMSe was produced with increasing soil mass, DMSe was trapped in the subsoil layers. DMSe emission to the air was related to the moisture content. After 10 d, 96 and 14% of injected DMSe was volatilized to the air from an air-dried soil and a water-saturated soil, respectively. Both insoluble (casein) and soluble (Casamino adds) organic amendments enhanced DMSe production and removal from soil through volatilization. This study suggests that organic amendments and frequent tillage are needed to increase Se volatilization from soil by enhancing production of DMSe and increasing soil porosity in facilitating the diffusion of trapped DMSe to the atmosphere.