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eco environment degradation
相关语句
  相似匹配句对
     City Eco-Environment
     城市生态环境
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     The Value of Eco-environment
     关于生态环境的价值
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     The Environment
     环境
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     Environment
     拯救地球环境
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     Eco-toxicity and biodegradation of atrazine in the environment
     阿特拉津生态毒性与生物降解的研究
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Desert control of Hexi corridor has representative significance in desert areas of northwest China. It has also checked the effectiveness of the utilization of desert control methods in 50 years. The main desert control methods in Hexi corridor include sand-fixation with plants, with mechanical sand barrier or its combination with plant, and closing as well as the establishment of wind breaking belt of farmland. The main problems of desert control in practice are follows: (1) It is not clear about the suitable...

Desert control of Hexi corridor has representative significance in desert areas of northwest China. It has also checked the effectiveness of the utilization of desert control methods in 50 years. The main desert control methods in Hexi corridor include sand-fixation with plants, with mechanical sand barrier or its combination with plant, and closing as well as the establishment of wind breaking belt of farmland. The main problems of desert control in practice are follows: (1) It is not clear about the suitable extent for desert control with plants. (2) The dense of afforestation is large, which lead to the artificial plants degrading and even dying in large scale. (3) The utilization of sand barrier is limited. (4) The predicting result of closing and raising herbs is not clear, and there is a blindness to utilize it in practice. (5) The choosing and combination of methods was carried out by subjective experience totally, thus their function can't be well brought into play. (6) The extensively pumping of groundwater for reclaimation is the main reason of eco\|environment degradation. The key way of solving the above\|mentioned problems is that desert control should be carried out comprehensively. It is the only correct way to control desert, and a breach of scientific progress in sand control.

河西走廊的防沙治沙在我国西北沙区具有一定的代表性。 5 0a的防沙治沙也是对所采用治沙措施的检验。 5 0a来河西走廊沙区采用的治沙措施主要有植物治沙、机械沙障固沙、封沙育草、机械沙障与栽植灌木相结合以及营造沙区护田林网等。治沙措施的应用在实践中表现出来的问题主要是 :①植物治沙的适用范围不清 ,提取地下水造林成为生态环境继续恶化的因素之一 ;②造林密度过大 ,导致人工固沙植被大面积衰败死亡 ;③机械沙障的应用受到限制 ;④封沙育草的预期结果不明 ,实际应用存在盲目性 ;⑤措施的选用和措施之间的搭配凭借主观经验 ,其功能得不到充分发挥 ;⑥打井开荒大量提取地下水 ,是治沙进一步生态环境退两步的最主要因素。解决上述问题的根本出路是综合治沙。综合治沙是防沙治沙的唯一正确之路 ,是今后治沙科技进步的突破口。

On the basis of systematical analysis on the natural and artificial factors and their relations influencing environment evolution, the leading factors of eco-environment degradation from the 1950's to the 1980's were extracted in quantitative analysis method in this area. The regional eco-environmental status has been exacerbated severely in recent 15 years. Irrational land exploitation activities seem to be main cause for land desertification.

以LandsatTM遥感影像数据和相关统计数据为基础 ,采用定性与定量分析方法相结合 ,在GIS空间统计功能的支持下 ,分阶段对松嫩沙地土地利用影响下的生态环境退化机制进行分析 .研究表明 ,近百年来特别是解放以后的 50年里 ,土地利用的显著变化和人类不合理的利用方式 ,导致土地盐碱化、沙化和草场退化严重 ,生态环境退化趋势显著 .这一结果对于土地资源的科学管理、生态环境的恢复重建具有现实意义 .

Tarim River basin is the largest inland river basin in China, located in south Xinjang of northwest China. It covers 1.05×10 6km 2 and is shared by five prefectures. It has population of 8.26×10 6 and cultivated land of 110.3×10 4 hm 2. It has become one of the most potential areas for development in implementing the Strategy of Developing China's West. However the eco environment in the basin has been degraded with the population growth, economic and social development since 1950. Extensive...

Tarim River basin is the largest inland river basin in China, located in south Xinjang of northwest China. It covers 1.05×10 6km 2 and is shared by five prefectures. It has population of 8.26×10 6 and cultivated land of 110.3×10 4 hm 2. It has become one of the most potential areas for development in implementing the Strategy of Developing China's West. However the eco environment in the basin has been degraded with the population growth, economic and social development since 1950. Extensive Reclamation in the tributary areas requires a large volume of water diverted to the local irrigation areas, resulting in a continuous decrease of stream water flowing to the Tarim mainstream from the tributaries and the downstream stream cut off for about 320km in length, even no discharge in an extremely watery year. The eco environment degradation in the Tarim downstream known as "Green Corridor" has been expedited. It is evident that there is no any regulating mechanism to control the wasteful water consumption in the prefectures of the tributaries. The unified water management at basin scale should be established in so as tackle these issues. Water management has been stressed on by the governments at all levels since the beginning of 1970's. The establishment of Tarim River Basin Management Bureau and Commission in 1992 was the attempt to commence the unified water management in Tarim River basin. Accordingly "Interim Provisions for Water Administration and Water Resources Management of Tarim River Basin" was also issued in so as legally enforce the implementation of the unified water management. However, it was ineffectively implemented because of the irrational institutional arrangements and authorized powers and functions. The stream water flowing to Tarim mainstream was still in decrease and no water discharged to downstream. The new Tarim Catchment Water Resources Commission was established according to the "Regulations on Tarim Catchment Water Resources Management of Xinjiang Uygur Autonomous Region" issued by Xinjiang People's Congress in December 1997. The Commission includes a standing committee and a management bureau and receives all heads of different sectors and related prefectures as its members. The regulation stipulates a series of the significant matters, such as the management system, mechanism, institutional arrangements and their functions, and water allocation principle. It provides the basis for implementing the unified water management and eco environment preservation. Because the new system is just operated, many issues are to be addressed. Therefore the paper proposes some suggestions and countermeasures in terms of necessary amendment of the regulation to complying with new water law and policy, building water market, establishment of water affair bureaus in prefectures and formation of rational mechanism for water charge calculation and collection, in order to effectively implement the unified water management and protect and restore the eco environment in the whole Tarim River basin.

随着塔里木河流域内人口的增长 ,经济社会的发展 ,对水资源开发利用程度的不断提高 ,塔里木河流域已成为新疆乃至全国生态环境劣变问题最为突出的地区之一。其中缺乏流域水资源的统一管理是造成塔里木河下游断流和生态环境劣变的主要因素之一。通过对塔里木河流域水资源统一管理的必要性、发展历史、现状及存在的问题等方面的分析 ,结合我国水法规、政策、管理体制建设的最新成果 ,提出了塔里木河流域实施水资源统一管理的对策和建议。

 
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