https://hdl.handle.net/10680/1844 2023-02-27T07：15：09Z 2023-02-27T07：15：09Z Indraratne，Srimathie P. Pierzynski, Gary M. Baker, Lucas R. Prasad，P.V。瓦拉 Arachchige，Pavithra S. Putumpe https://hdl.handle.net/10680/2036 2023-02-15T09:00:25Z 2022-08-18T00：00：00z

沉淀的肥料堆肥改善了矿山变质特性，从而增强了潜在有毒金属Indraratne，Srimathie P。的植物生长和植物稳定。Pierzynski，Gary M。；贝克，卢卡斯·R。Prasad，P.V。瓦拉;Arachchige，Pavithra S. Putumpe Feedlotmanure富含植物营养素，并可以固定潜在的有毒金属。但是，在我的战利品中，颗粒状的肥料堆肥作为修正案（聊天）的研究尚未得到很好的研究。进行了这项研究是为了研究颗粒牛粪对改善聊天特性的影响，从而促进植物稳定和草的建立。使用有或没有膨润土（b）的三分（60、120和180 mg ha -1）的肥料进行了一个未经修改和修改的聊天（经过柠檬处理）的温室锅实验，并使用两种天然草（panicum virgatum）（panicum virgatum）L.）和小麦（Pascopyrum Smithii（Rydb。）A。Löve）。 Leachates from pots were collected periodically until harvest. Nutrients and metal concentrations were measured in chat treatments, and metal concentrations were measured in plant tissues and leachates. Manure-amended chat reduced leachate Cd and Zn on average by >75% and >80%, respectively. Above-ground dry matter yield increased by >2.5-fold and >4-fold, respectively, in switchgrass and wheatgrass with the increase of 3-fold manure rate. The manure rate at 180 Mg ha−1 reduced plant Cd and Zn by 50% and 20%, respectively, in wheatgrass, and 30% and no reduction, respectively, in switchgrass, compared to the 60 Mg ha−1 manure rate. Overall, pelleted manure compost significantly increased available nutrients and decreased available metals in amended chat, with no significant effect of B. This study indicated that pelleted manure, preferably at 180 Mg ha−1 rate with lime, can be used in acidic metal-contaminated chat to facilitate the establishment of perennial native grasses and reduce the potentially toxic metal availability.

2022-08-18T00：00：00z Indraratne，Srimathie P. Pierzynski, Gary M. Baker, Lucas R. Prasad，P.V。瓦拉 https://hdl.handle.net/10680/2035 2023-02-15T09:00:29Z 2021-04-26T00:00:00Z

纳米氧化物固定镉，铅和锌，矿物质和污染的土壤，促进植物生长Indraratne，Srimathie P.; Pierzynski, Gary M.; Baker, Lucas R.; Prasad, P.V. Vara Nanoparticles with high reactivity can be applied as amendments to remediate soil metal contaminations by immobilizing toxic elements. Nano-oxides of Fe have been studied but Al and Ti nano-oxides have not been tested for their remediation capacity of toxic metals. The potential of synthesized iron (Fe-O), aluminum (Al-O), and titanium (Ti-O) nano-oxides for stabilizing Cd, Pb, and Zn in mine spoil (Chat) and contaminated soil was compared using adsorption studies and a greenhouse experiment. Chat and soil were amended with nanooxides at two rates (25 and 50 g·kg−1) and a pot experiment was conducted with sorghum (Sorghum bicolor L. Moench). Leachates were collected twice per week from plant emergence to harvest at maturity and metals were compared against an unamended control. Chat was contaminated with Cd, Pb, and Zn at 84, 1583, and 6154 mg·kg−1, and soil at 15, 1260, and 3082 mg·kg−1, respectively. Adsorption conformed to the Langmuir linear isotherm and adsorption maxima of metals were in the order of Al-O > Ti-O ≥ Fe-O. Nano-oxides reduced Cd concentration by 28% (Fe-O) to 87% (Ti-O) and Zn concentration by 14% (Fe-O) to 85% (Al-O) in plant tissues compared with unamended Chat. Nano-oxides significantly reduced Cd, Pb, and Zn in leachates and available Cd and Zn in Chat/soil relative to the respective unamended controls. Nano-oxides can be used to remediate heavy metal contaminated Chat and soil and facilitate plant growth under proper nutrient supplements. Nano-oxides of Al-O and Ti-O remediated metals more effectively than Fe-O.

2021-04-26T00:00:00Z Indraratne, Srimathie P Spengler，马修 Xiying, Hao https://hdl.handle.net/10680/2034 2023-02-15T09：00：31Z 2021-02-03T00：00：00z

牲畜粪便载荷和遗留机构影响copper and zinc availability under rainfed and irrigated conditions Indraratne, Srimathie P; Spengler, Matthew; Xiying, Hao Long-term cattle manure applications build up nutrient pools and can lead to trace element enrichments in soils. The objectives of this study were to evaluate copper (Cu) and zinc (Zn) loadings in the soil during continuous annual cattle manure applications and determine the time required for soil to return to its pre-manure available Cu and Zn levels after manure is discontinued. The manure application rates were 0, 30, 60, and 90 Mg·ha−1 for rainfed and 0, 60, 120, and 180 Mg·ha−1 (wet weight) for irrigated plots. Although manure was applied for 45 yr in some plots, applications were terminated in one subset of treatments after 14 yr and in another subset after 30 yr to study legacy effects after 31 and 15 yr, respectively. Soil samples were collected in the fall of 2003, 2008, 2013, and 2018 and analyzed for available Cu and Zn. Crops were grown in all years continuously with Cu and Zn concentrations measured in both silage and grains harvested. The regression model developed using data collected suggests long legacy effects with recovery time to pre-manure levels ranging from 10 to 20 yr for Cu and 23 to 41 yr for Zn at irrigated and 10–24 for Cu and 21–32 yr for Zn under rainfed, respectively. Long-term applications of cattle manure could lead to accumulation of Cu and Zn, creating long-lasting legacy effects in soils with the increased environmental risk of leaching to groundwater.

2021-02-03T00：00：00z Indraratne，Srimathie P. Attanayake，Chammi P. Kumaragamage，Darshani Amarawansha，Geethani GOLTZ，道格拉斯·M。 Applin, Daniel M. https://hdl.handle.net/10680/2033 2023-02-14T09：00：46Z 2023-01-17T00：00：00z

由于添加了沸石和氧化锰修正案，砷和钒在钙质土壤中的迁移率Indraratne，Srimathie p。;Attanayake，Chammi P。；Darshani的Kumaragamage；Amarawansha，Geethani；GOLTZ，道格拉斯M。Applin，Daniel M.添加锰（IV）氧化物（MNO2）和沸石会影响土壤中AS和V的迁移率，这是由于地球化学变化在钙质，洪水泛滥的土壤中尚未得到很好的研究。这项研究评估了用MNO2或沸石表面表面淹没的土壤中AS和V的迁移率。使用来自四个钙质土壤的完整土壤柱进行了8周的模拟夏季洪水研究。在土壤中测量了氧化还原电位，而pH，主要阳离子和AS和V浓度在孔隙水和洪水中每两周测量。使用视觉Minteq建模软件在洪水（WAF）后0、4和8周对水性AS和V物种进行建模，其输入参数具有氧化还原电位，温度，pH，总碱度以及主要阳离子和阴离子的浓度。 Aqueous As concentrations were below the critical thresholds (<100 μg L−1), whereas aqueous V concentrations exceeded the threshold for sensitive aquatic species (2–80 μg L−1). MnO2-amended soils were reduced to sub-oxic levels, whereas zeolite-amended and unamended soils were reduced to anoxic levels by 8 WAF. MnO2 decreased As and V mobilities, whereas zeolite had no effect on As but increased V mobility, compared to unamended soils. Arsenic mobility increased under anoxic conditions, and V mobility increased under oxic and alkaline pH conditions. Conversion of As(V) to As(III) and V(V) to V(IV) was regulated by MnO2 in flooded soils. MnO2 can be used as an amendment in immobilizing As and V, whereas the use of zeolite in flooded calcareous soils should be done cautiously.

2023-01-17T00：00：00z