農業(yè)資源與環(huán)境專業(yè)(存儲版)
【正文】 ased materials output。 water pollution Soil pollution Biodiversity decreasing 4000～ 5000 advanced plant species accounted for 15％～ 20％of total plant species are in severe danger. It was reported that 354 wild plants and 258 wild animals were extinct status. 740 world endangered species in 《 Convention on International Trade in Endangered Species of Wild Flora and Fauna》 was listed， 189 species belong to our country’s and account for 25% of it。 Secondly, practising cleaner production in all steps and nonproduction for preproduction—during production—post production, going to the way “Cyclic Economy ” ； Thirdly， protecting ecological environment,namely protect the capability of food sustainable production. 4. Social effect— maintaining social stability “Food be god to the people， safety take priority of food”. “Well fed,well bred”（ food quantity safety）、“ be well fed”（ food quality safety） and “eating healthy”（ safety of the capability of sustainable production）， people can live and work in peace and contentment， settle down to produce. society can be safety, stabilization. the world can be peaceful and tranquility. 5. Political significance — nation’long period stability International aspect: our nation is a developing agricultural great Power. ensuring food quantity safety is the political needs of defending state sovereignty and safety, insteading of another country39。s Republic of China founded for 58yr， dress warmly and ear one39。 ? Popularizing ecological agriculture patterns， monly increase production about 10％～ 20％ more than that of traditional plant pattern. 三、 Environmental protection role of ecological agriculture ? Firstly， developing ecological agriculture and popularizing ecological agricultural techniques are to farthest decrease “wastes”emission and realize wastes decrement 。 Our country decreased million hm2 good plowland area in 10 years, which lost over 400 million tons grains ， accounted for 10％ of total food production. Water and soil loss severity China is one of the most bad countries in water and soil loss. Now， water and soil loss areas reach to million hm2 in chna， account for ％ of total country, and increase at the 10000 hm2 speed rate per year. The severity of water and soil loss make china loss 50 hundred million tons surface soils, bring out lots of N、 P、 K nutrition elements. Environmental pollution pricking up Air pollution 水質污染 Air pollution and acid rain stimulatingly took place in many province and city. China is the third acid rain area in the world. There were 14 badly polluted rivers and 54 polluted rivers in 78 main rivers in china. At present, plowland areas polluted by Cd、As、 Cr、 Pb etc heavy metal elements reach 20 million hm2， account for 20% of total cultivated lands。s life safety and lifequality 2. Economic significance— enhancing economic ine Maintaining food safety and upgrading food quality are of great advantage to promote international export trade， enhance economic returns of state, enterprises
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