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Application of Integrated Watershed Management Measures to Minimize the Land Use Change Impacts
Water ( IF 3.4 ) Pub Date : 2021-07-26 , DOI: 10.3390/w13152039
Fatemeh Rajaei , Reza Dahmardeh Behrooz , Ebrahim Ahmadisharaf , Saman Galalizadeh , Branislav Dudic , Velibor Spalevic , Rajko Novicevic

Non-point source pollution is a major factor in excessive nutrient pollution that can result in the eutrophication. Land use/land cover (LULC) change, as a result of urbanization and agricultural intensification (e.g., increase in the consumption of fertilizers), can intensify this pollution. An informed LULC planning needs to consider the negative impacts of such anthropogenic activities to minimize the impact on water resources. The objective of this study was to inform future land use planning by considering nutrient reduction goals. We modeled the LULC dynamics and determined the capacity for future agricultural development by considering its impacts on nitrate runoff at a watershed scale in the Tajan River Watershed in northeastern Iran. We used the Soil and Water Assessment Tool (SWAT) to simulate the in-stream nitrate concentration on a monthly timescale in this watershed. Historical LULCs (years 1984, 2001 and 2010) were derived via remote sensing and were applied within the Land Change Modeler to project future LULC in 2040 under a business-as-usual scenario. To reduce nitrate pollution in the watershed and ecological protection, a conservation scenario was developed using a multi-criteria evaluation method. The results indicated that the implementation of the conservation scenario can substantially reduce the nitrate runoff (up to 72%) compared to the business-as-usual scenario. These results can potentially inform regional policy makers in strategic LULC planning and minimizing the impact of nitrate pollution on watersheds. The proposed approach can be used in other watersheds for informed land use planning by considering nutrient reduction goals.

中文翻译:

应用综合流域管理措施以尽量减少土地利用变化的影响

面源污染是营养物过度污染导致富营养化的主要因素。城市化和农业集约化(例如化肥消费增加)导致的土地利用/土地覆盖 (LULC) 变化会加剧这种污染。明智的 LULC 规划需要考虑此类人为活动的负面影响,以尽量减少对水资源的影响。本研究的目的是通过考虑养分减少目标来为未来的土地利用规划提供信息。我们对 LULC 动态进行了建模,并通过考虑其对伊朗东北部塔詹河流域流域规模的硝酸盐径流的影响来确定未来农业发展的能力。我们使用土壤和水评估工具 (SWAT) 来模拟该流域每月时间尺度上的河流中硝酸盐浓度。历史 LULC(1984 年、2001 年和 2010 年)是通过遥感得出的,并在土地变化建模器中应用,以在一切照旧的情况下预测 2040 年的未来 LULC。为了减少流域的硝酸盐污染和生态保护,使用多标准评估方法开发了保护方案。结果表明,与一切照旧的情景相比,实施保护情景可以大大减少硝酸盐径流(高达 72%)。这些结果可能会为区域政策制定者提供 LULC 战略规划和最大限度地减少硝酸盐污染对流域的影响。
更新日期:2021-07-26
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