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Response of soil organic carbon and soil health indicators to treated wastewater irrigation in bioenergy sorghum production on an arid soil
Land Degradation & Development ( IF 4.7 ) Pub Date : 2021-01-13 , DOI: 10.1002/ldr.3888
Vijayasatya N. Chaganti 1 , Girisha Ganjegunte 1 , Anil Somenahally 2 , William L. Hargrove 3 , April Ulery 4 , Juan M. Enciso 5 , Robert Flynn 4
Affiliation  

Treated urban wastewater (WW) reuse for crop irrigation is seen as an way to mitigate prolonged drought effects and reduced freshwater (FW) availability for agriculture in arid west Texas. However, the impacts of WW on arid soil health are not clearly understood. This field study evaluated the effects of WW irrigation on soil health indicators including soil organic carbon (SOC), permanganate oxidizable carbon (POXC), mineralizable carbon (MC), and soil protein under bioenergy sorghum production. Water type and gypsum + sulfur application were used as main and subplot factors in a split‐plot experimental design with growth year as a repeated measure. Results across time and soil amendments showed that the SOC of WW‐irrigated soils (3.26 g kg−1) was significantly higher than that of FW‐irrigated soils (2.96 g kg−1). This signifies the positive impact of WW to contribute to soil carbon with no associated priming effects. Wastewater and soil amendment application by themselves did not affect other soil health indicators, given their soil salinization potential. Irrespective of the water type and amendment application, soil POXC significantly increased from 245 to 262 mg kg−1 over time, indicating that a labile pool of C was added to the soil. Soil protein concentrations significantly decreased from 1.31 to 1.23 g kg−1 after 2 years, possibly due to mineralization of organic nitrogen. In conclusion, our results demonstrate that WW application did not adversely affect soil health in the short term. Long‐term studies could provide more insight into the sustained effects of WW irrigation on arid soil health.

中文翻译:

干旱土壤上生物能源高粱生产中土壤有机碳和土壤健康指标对污水处理灌溉的响应

经过处理的城市废水(WW)再用于农作物灌溉,被认为是减轻干旱的长期影响并降低德克萨斯州西部干旱地区农业淡水(FW)利用率的一种方法。但是,人们尚不清楚WW对干旱土壤健康的影响。这项野外研究评估了生物能源生产过程中WW灌溉对土壤健康指标的影响,这些指标包括土壤有机碳(SOC),高锰酸盐可氧化碳(POXC),矿化碳(MC)和土壤蛋白质。水类型和石膏+硫的施用量是分裂地块试验设计中的主要和子地块因子,并以生长年作为重复度量。跨时间和土壤修正的结果表明,WW灌溉土壤的SOC(3.26 g kg -1)明显高于FW灌溉土壤(2.96 g kg -1)。这表明WW对土壤碳有积极作用,而没有相关的引发作用。考虑到土壤盐碱化的潜力,废水和土壤改良剂的应用本身不会影响其他土壤健康指标。不管水的类型和改良剂的使用如何,土壤POXC随时间推移均从245毫克kg -1显着增加,这表明向土壤中添加了不稳定的C池。土壤蛋白质浓度从1.31 g kg -1显着降低2年后,可能是由于有机氮的矿化。总之,我们的结果表明,WW的应用在短期内不会对土壤健康产生不利影响。长期研究可能会提供更多有关WW灌溉对干旱土壤健康的持续影响的见解。
更新日期:2021-01-13
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