就沙漠人造海可行性答疑

针对沙漠人造海某些代表性的反对意见 ,通过科学论证与分析认为 :依靠现代科学技术完全可以实现沙漠人造海工程 ;存储于沙漠构造盆地之中的人造海 ,不会漏水也不会污染地下水 ;人造海不会浸染周边沙土也不会形成盐尘暴 ;沙漠人造海可以调节小气候 ,增加区域降雨量并降低蒸发量 ;当代海水灌溉农业取得的科技成果可直接为沙漠绿化服务 ;若能充分利用渤海“海冰融水”资源改造北方沙漠 ,将会产生更好的生态环境效益。

环保警示牌

你知道吗?沙漠什么样? 沙漠是最普通的一种荒漠。那么什么是荒漠呢?荒漠是地球上干旱地区最常见的景观,不论在热带或者温带都有广泛的荒漠分布。荒漠终年干旱少雨,风沙作用活跃,地表水贫乏,植被稀少,昼夜温差变化剧烈,白天灼热,夜晚寒冷。因此,荒漠地区一般人迹罕至。 荒漠的外貌多种多样,常见的除了沙漠外还有砾漠和岩漠。沙漠地表上覆盖着细沙粒,形成了一个个沙丘。借助着大风的力量,沙丘在地表上流动。流动的沙丘可以吞没农田、村庄,

Analysis and assessment of land desertification in Xinjiang based on RS and GIS

The land desertification in Xinjiang was monitored and analyzed based on RS and GIS techniques. Satellite data interpretation was adopted to obtain the general situation of Xinjiang’s land desertification in assistance with the sampling method and on-the-spot investigations. Related monitoring and investigations showed that Xinjiang was facing with severe wide range land desertification, and its desertified area made up 77.08% of the total monitoring area. As for land types, the desertified farmland accounted for 1.92% of the total monitoring area, desertified woodland 4%, desertified grassland 45%, and unused land 49%. Accordingly, as for desertification degrees, non-desertified land occupied 22.92%, weak desertified land 5.69%, medium-degree desertified land 16.58%, severe desertified land 33.19% and super severe desertified land 21.61%. Finally, as for inducing factors, wind-eroded desertification made up 58.23%, water-eroded desertification 8.69%, salinization desertification 6.52% and frozen-melt eroded desertification 3.64%. Xinjiang’s land desertification tended to get worse and the harnessing mission remained hard.

从一张漫画谈起

最近,我偶在《讽刺与幽默》上看到一幅漫画,题为“人造沙漠”。笔法简练,寓意深刻。何为“人造沙漠”?不言而喻,由于滥砍滥伐引起土地大量流失,土质大面积沙化,人类正面临着人自己制造的危机的考验. 人诚然是伟大的,特别是人的创造能力尤为可佳。人造机器、人造轮船、人造飞机……近几十年来又出现了人造地球卫星、人造飞船,而人类几千年来发展的文明史竟要毁于人类自己手中,岂不可悲?

“海绵城市”的现代“护肤霜”

城市和乡村的一个重要区别在于道路的硬化与否。乡间小路固然诗意盎然,但一场小雨过后就会变得泥泞不堪;而硬化的道路在提高了卫生水平和交通效率的同时,也让城市里越来越有限的土地变成了既不透水也不透气的＂塑料大棚＂,形成了生态学上的＂人造沙漠＂,给城市的生态环境带来了极大的负面影响。