环境保护 水科学（Environmental protection water science）.docVIP

环境保护 水科学（Environmental protection water science） 1 common features of ecosystems: It has three functions: energy flow, material circulation and information transmission. Self adjustment ability. Thirdly, it is a dynamic system 2 the concept of an ecosystem: an ecological functional unit consisting of biological and abiotic components in a given space. 3 definition: natural resources is all human beings from the natural conditions in the uptake and application necessary for human life and production of natural ingredients, it usually refers to the soil, land, water, forest, grassland, wetland, sea, native plants and animals, microorganisms and minerals etc. 4 what are the common characteristics of natural resources? 1, scarcity, regional, multi-purpose, integrity 5 Analysis of the shortage of water resources in china: The distribution trend of water resources leads to the lack of water resources, Population density is big, per capita water resources is little In most parts of China and rainfall affected by monsoon climate, the interannual and seasonal variations of precipitation are great, resulting in frequent floods and droughts The imbalance between demand and water supply capacity Human waste in the process of water consumption Atmospheric pollution, the impact of energy on the environment? 3 air pollutants to a certain extent, and keep enough time to public health, animal, plant, materials, can affect the measurement of the atmospheric characteristics or environmental factors of aesthetics, is the air pollution. Primary energy means obtaining from nature without changing its basic form and energy, also known as primary energy, and the two energy refers to the energy that has been processed and converted into another form. Impact on the environment: urban air pollution Increasing the accumulation of carbon dioxide in the atmosphere Acid rain The problem of nuclear waste 4, environmental pollution: primary pollution and two pollution, atmospheric pollution standar