期刊
AGRICULTURE ECOSYSTEMS & ENVIRONMENT
卷 151, 期 -, 页码 44-52出版社
ELSEVIER
DOI: 10.1016/j.agee.2012.02.003
关键词
Irrigation; Salt balance; Diffuse salt pollution; Drainage fraction; Soil gypsum; Water quality
资金
- Almudevar Water User Association (Comunidad de Regantes de Almudevar, CRA)
- Ebro River Basin Authority (Confederacion Hidrografica del Ebro, CHE)
- Spanish Ministry of Science and Education [AGL2006-11860/AGR]
- European Regional Development Fund (FEDER)
- European Union [CT-2005-015031]
Irrigation district salt balances identify the main sources and sinks of salts and quantify salt loads in irrigation return flows. Salt balances were performed in La Violada Irrigation District during the 80s (1982-1984), 90s (1995-1998) and 00s (2006-2008) decades. Total Dissolved Solids (TDS) and loads in irrigation return flows were related with changes in irrigation performance and infrastructures during these decades. TDS increased linearly to increases in Irrigation Consumptive Use Coefficient (ICUC) (P < 0.01), and decreased with increases in Drainage Fraction (DRF) (P < 0.001). The salt balances revealed that 82% of the exported salts originated from soil gypsum dissolution. Annual salt yields in return flows were high and similar in the 805 and 90s (about 19.3 Mg/ha year), and halved in the 00s (9.9 Mg/ha year) due to comparable reductions in irrigation and drainage volumes derived from a better irrigation performance. Irrigation season salt yields were high and steady around 14.1 Mg/ha for ICUC < 51% and DRF > 66%, and decreased exponentially for values above and below these thresholds, respectively. Therefore, the key management strategy to reduce salt discharge to downstream areas is to decrease drainage volumes by improving irrigation management. (c) 2012 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据