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The reuse of wastewater for the irrigation of farmlands is gaining popularity, and the nutrient leaching associated with wastewater irrigation is becoming a matter of concern. The variability of nitrogen and phosphorus fractions in wastewater-irrigated soil was investigated in both horizontal and vertical directions in Kongjiaxiang, Tongliao, Inner Mongolia, China. The results showed that wastewater irrigation resulted in the concentrations of available N and P being 40.36% and 66.49% higher, respectively, than those with groundwater irrigation. Different forms of N and P exhibited significantly different distribution patterns. Higher concentrations of NO3- and total available N, as well as of those of Ca-P and total available P were observed near wastewater irrigation channels. Ca-P has a spatial distribution pattern similar to that of available P. The concentrations of NO3- and NH4+ were the highest in top soil and decreased with depth. The complex interactions between nitrate leaching and nitrogen transformation processes (e.g., nitrification, denitrification, and mineralization) determined the vertical profile of NO3- . The significant amount of NH4+ loss inhibited its deep seepage. The Ca-bound compound contained more P than other inorganic fractions as a result of high Ca levels throughout the soil profile. The differences in the concentrations of Ca-bound P at different depths could be due to the upward flux or translocation of Ca from subsurface to surface soil and the sequestration of P. 相似文献
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中考体育,体育尖子生可免试还记满分,可想其中的寻租空间何等惊人。结果,深圳今年一不小心就有3116名“体育尖子生”获免考及满分资格,而去年深圳免考体育尖子生的人数是1800人。 相似文献
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中国人打的是麻将,谈的是人情,讲究的是烟雾袅绕说学逗唱加坑蒙拐骗,竞技麻将非要跟斯诺克台球一样西装领结一本正经不准喧哗,中国选手未战便已先输了气场。如此看来,国麻今夏输于欧洲,倒也不算冷门。 相似文献
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巴西人打造的里约热内卢狂欢节被称作“世界上最大的派对”以及“地球上最伟大的表演”。狂欢精神曾被认为是巴西人的治愈良方,因桑巴和足球,所有的痛苦都会霎时化为乌有。 相似文献
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当代社会,媒介发展不断加快,人们借助媒介感知周围,促使多元文化与多重价值观加速碰撞,展现出生动的图景世界。电视在媒介景观的构建中扮演着重要的角色,它通过视觉呈现的方式将真实世界的人和事件巧妙地呈现出来,满足大众的视觉需求,同时传递社会主义核心价值观。本文试图从媒介景观理论切入,聚焦近日出圈的旅行类真人秀综艺节目《花儿与少年·丝路季》,剖析其内部的媒介景观构建逻辑。 相似文献
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技术化生存是人类自为生存方式的一种表现形式,特指工业社会时期,科学技术高速发展阶段,人类对近代技术和技术产品高度依赖状态下的人类生存方式.技术化生存作为技术时代人类的生存方式,具有生存时代的近代工业化、生存基础的技术依赖性、生存状态的技术意识形态化和生存活动组织方式的＂非理性＂等特征.技术化生存中人类生存面临着困境,从本质上说技术生存中人类的生存困境是文化的困境.摆脱人类生存困境,需要人类的生存方式从技术化生存向创造性生存的转向. 相似文献