【摘 要】
：
Soil and water conservation practices have been extensively used in effective watershed management.The impact of each conservation practice is site specific and dependent on the implementation site in the watershed.In order to select cost effective placem
【机 构】
：
Department of Range and Watershed Management,College of Natural Resources and Environment,Ferdowsi U
论文部分内容阅读
Soil and water conservation practices have been extensively used in effective watershed management.The impact of each conservation practice is site specific and dependent on the implementation site in the watershed.In order to select cost effective placement of conservation practices with high impact,a large number of spatial combinations is needed to be compared.In this study,an optimization model framework is presented to find cost effective solutions for sediment yield and runoff control in the Fariman dam watershed in the Northeast of Iran.This was accomplished by integrating soil and water assessment tool (SWAT) for simulation of watershed hydrology and multi objective genetic algorithm(NSGA-Ⅱ) for spatial optimization of soil and water conservation practices.The optimized solutions provided a trade-off between the two objective functions.The final Pareto-optimal shows that the impact of soil and water conservation practices on sediment yield is more than stream flow.The trade-offs between the objective functions show that the implementation of the median cost can lead to a sig-nificant decrease of 22.1％ in the amount of sediment yield,and 10％ in stream flow.Also,percent change achieved through median cost is very close to percent reduction with the highest cost.Results of low cost solution show that the vegetative practices are a suitable economic scenario for soil and water conser-vation.The introduced framework can be adapted as a suitable tool for selecting cost effective conser-vation practices in different regions.
其他文献
Identifying land management practices (LMPs) that enhance on-site sediment management and crop productivity is crucial for the prevention,reduction,and restoration of land degradation and contributing to achieving land degradation neutrality (LDN).We revi
化工园区作为环境风险企业的主要聚集区,既是突发水污染事件的高发区,也是各类敏感水体的重要环境风险来源,因此构建企业、园区、周边大江大河三级环境风险防控体系,提升园区突发水污染事件应急防范水平至关重要.文章阐述了化工园区建设三级防控体系的必要性,介绍了园区三级防控体系的概念及建设思路.
Water scarcity threatens global food security and agricultural systems are challenged to achieve high yields while optimizing water usage.Water deficit can be accentuated by soil physical degradation,which also triggers water losses through runoff and con
衬衫是19世纪西方乃至现代社会绅士着装中不可或缺的重要部分.为了探究19世纪初西方男士衬衫形制与结构特点,文章对英国维多利亚与艾伯特博物馆、美国大都会艺术博物馆等馆藏的共29件19世纪初男士衬衫藏品进行考察和研究,结合相关文献资料,对19世纪初西方男士衬衫的形制结构特点进行梳理与分析,并选取一款具有一定形制结构典型性的男士衬衫进行复原制作与研究,得到复原效果较好的衬衫复制成衣.这对衬衫历史发展与结构演变研究体系的完善具有积极意义.
River channel shifting in the deltaic regime is an unabated occurrence.Channel shifting has become one of the concerns as it influences land use/land cover along the riverbank in various ways.For the man-agement of the river,it is indispensable to study t
从当前的产业结构情况看,轻工业的发展速度不断加快,占比也在不断提高,中小型企业的数量逐渐增多,在该情况下,为了更好地保证企业和产业的稳步发展,保障生产工作的顺利进行,需要对安全隐患和安全生产事故的原因进行细致的分析.只有正确认识到安全生产的重要性,了解事故出现的主要原因和影响因素,提出针对性的策略,才能够取得更好的管控效果,促使生产安全情况得到优化,避免出现生产质量及全过程不规范的问题.
贵州地区的蜡染装饰是当地苗族一种极具地方特色的装饰,颜色淡雅、纹饰夸张、文化深厚,是贵州民间艺术展示的代表窗口.其表现手法活泼、形式独特,充满了当地民众生存的智慧和创造的乐趣.通过对艺术类学生进行关于蜡染工艺的系统性学习及实训,使其更直观地理解贵州蜡染的历史、文化、工具、工艺、图案;并在之后的应用设计中将蜡染传统制作工艺、装饰形式与现代审美、图案肌理等有效融合,实现创新性发展、创造性转化,从而推动传统文化与现代设计的交融互通,让学生更好地理解文化自信,实现非物质文化遗产传承发展.
Woody species within pastures and savannas are often associated with \'resource islands\' characterized by higher fertility under canopies trees.The aims of this study were to evaluate (1) the effects of Prosopis juliflora on some soil physicochemical
根据不同地区资源禀赋和特色,将旅游引入农业,共同构筑休闲农业,是甘肃实现农业现代化和乡村振兴的重要途径.甘肃省休闲农业发展态势强劲,规模效益不断增加,但与发达地区相比存在明显的差距,发展演化过程中存在空间布局不合理、资源和市场间匹配度差、低层次同质化严重、服务质量欠佳、配套设施落后、模式创新不足等问题.针对以上问题,提出科学合理规划,优化产业布局;加强基础设施建设,完善公共服务体系;明确市场定位,加强创意设计;培育地域公共品牌,提升服务管理水平;探索利益连接机制,稳定提升农民收入等加快甘肃省休闲农业可持续
综述了桃树抗寒相关的生理生化和分子机理研究进展,并展望了桃树抗寒研究的发展趋势,为深入研究桃树的抗寒性机理和培育抗寒品种提供参考.