Weather in Bei 'an City, Heilongjiang Province

Question 1:A?

Question 2: D.

Question 3:B

Test analysis:

Question 1: Ability to investigate and analyze the causes of ecolo

Weather in Bei 'an City, Heilongjiang Province

Question 1:A?

Question 2: D.

Question 3:B

Test analysis:

Question 1: Ability to investigate and analyze the causes of ecological problems (soil erosion). The conditions of soil erosion are: large fluctuation, strong precipitation concentration, loose topsoil and low vegetation coverage. This topic examines climatic conditions. Bei 'an is a temperate monsoon climate zone, with concentrated precipitation and heavy rainfall in summer. There are many seasonal frozen soils in high latitudes. In the process of seasonal frozen soil freezing, groundwater moves up and freezes in frozen soil, and the water content of frozen soil increases and its volume expands. Thawing process is slow. In early spring, snow, ice and topsoil are repeatedly melted during the day and frozen at night, which makes the loose black soil more loose. The unfrozen frozen layer below prevents the snowmelt water from penetrating underwater like a waterproof board, and the snowmelt water flows down the slope, resulting in a large number of rills on the slope and eroding the surface soil; Bei 'an is characterized by "ten years and nine droughts". The cracked topsoil is not covered by crops. When encountering strong wind, the soil will move with the wind, and the dust will fly and even fly sand and stones, resulting in serious soil erosion. Strong light intensity and large temperature difference will not lead to soil erosion.

Question 2: Examine the ability to analyze problems. Rarity refers to characteristics that are not available or typical in other fields. The rarity of Wuyuer River Nature Reserve is as follows: geographically, the reserve is located in the upper reaches of Wuyuer River in Songnen Plain, inland of Northeast Asia, which is the breeding and migration place of many coastal wintering and inland breeding birds, and also the transition zone and breeding place between Australia, Southeast Asia and northern near-polar bird migration; Wuyuer River Nature Reserve has excellent ecological conditions, and many rare species are distributed here, such as wild plants such as wild soybeans. Storks and other rare and endangered animals, there are 39 species of national first-class and second-class key protected animals in the reserve; The periphery of Wuyuer River Nature Reserve was developed late and rarely damaged. There are basically no residential areas and production points in the planned core area, and the ecosystem inside has been evolving and developing according to its own laws. It is the natural background of the wetland ecosystem in Songnen Plain of China, and belongs to a well-preserved wetland ecosystem.

Question 3: Investigate the function of combining materials to analyze water diversion channels. Due to the influence of climate change (global warming) and human activities (human interception of wetland water), the water storage capacity of wetlands in nature reserves has generally declined, resulting in serious degradation of wetland ecosystems. Water is the life of wetland, and there is no wetland without water. Among the three characteristics of wetland (hydrology, soil and vegetation), hydrology is the most important factor in the formation and succession of wetland ecosystem, and hydrological changes have great influence on wetland ecological environment. The main purpose of the main canal for diverting water from Nenjiang River in central China is to provide ecological water for wetlands and maintain ecological water use for wetlands.