以微博、微信等为代表的社交媒体(Socia l Me d ia)的出现,凭借其互动性、及时性、便捷性、海量信息等特点,迅速展现了其在信息传播方面的独特优势。美国国家档案与文件署(NARA)抓住社交媒体迅速发展的时机,运用社交媒体开展档案宣传工...以微博、微信等为代表的社交媒体(Socia l Me d ia)的出现,凭借其互动性、及时性、便捷性、海量信息等特点,迅速展现了其在信息传播方面的独特优势。美国国家档案与文件署(NARA)抓住社交媒体迅速发展的时机,运用社交媒体开展档案宣传工作,取得了明显成效。做法社交媒体也称为社会化媒体、社会性媒体,是基于Web2.0技术,融合了网络技术社交互动,允许人们撰写、分享。展开更多
Agriculture is being main stay of Pakistan economy and it’s very significant to monitor the existing agricultural areas and its changes, due to different aspects like salinity and waterlogging, which reduce the ferti...Agriculture is being main stay of Pakistan economy and it’s very significant to monitor the existing agricultural areas and its changes, due to different aspects like salinity and waterlogging, which reduce the fertility of agricultural lands adversely. Managing salinity so as to minimize its environmental impact is a prerequisite for the long-term sustainability of irrigated agriculture. It is ironic that the irrigated areas are those that are afflicted most by the twin menaces of waterlogging and salinity. Geospatial technology was used to assess the waterlogging and salinity condition in Nara canal command area, during the last two surveys conducted in years 1977-1981 and 2001- 2003 respectively. After analyzing the results in detail, we obtain a clear relationship among salt affected soils, and waterlogged areas reveal that 0.2% to 1.25% of salt affected areas fall under the shallow zone with high water table. The spatial distribution of water table shows various trends among the water tables, and the surface salinity of surface saline areas has been increased due to waterlogging caused by unmanaged spatial drainage system.展开更多
文摘以微博、微信等为代表的社交媒体(Socia l Me d ia)的出现,凭借其互动性、及时性、便捷性、海量信息等特点,迅速展现了其在信息传播方面的独特优势。美国国家档案与文件署(NARA)抓住社交媒体迅速发展的时机,运用社交媒体开展档案宣传工作,取得了明显成效。做法社交媒体也称为社会化媒体、社会性媒体,是基于Web2.0技术,融合了网络技术社交互动,允许人们撰写、分享。
文摘Agriculture is being main stay of Pakistan economy and it’s very significant to monitor the existing agricultural areas and its changes, due to different aspects like salinity and waterlogging, which reduce the fertility of agricultural lands adversely. Managing salinity so as to minimize its environmental impact is a prerequisite for the long-term sustainability of irrigated agriculture. It is ironic that the irrigated areas are those that are afflicted most by the twin menaces of waterlogging and salinity. Geospatial technology was used to assess the waterlogging and salinity condition in Nara canal command area, during the last two surveys conducted in years 1977-1981 and 2001- 2003 respectively. After analyzing the results in detail, we obtain a clear relationship among salt affected soils, and waterlogged areas reveal that 0.2% to 1.25% of salt affected areas fall under the shallow zone with high water table. The spatial distribution of water table shows various trends among the water tables, and the surface salinity of surface saline areas has been increased due to waterlogging caused by unmanaged spatial drainage system.
