Minqin immigration table

(1)① The climate is dry and water resources are scarce (1) ② The ecological environment is fragile (1).

(2)① The planting area of spring wheat (cool-loving, cold-r

(1)① The climate is dry and water resources are scarce (1) ② The ecological environment is fragile (1).

(2)① The planting area of spring wheat (cool-loving, cold-resistant and demanding high water content) is decreasing year by year, and the planting range is reduced (1 min).

(2) The planting area of maize is increasing year by year, and the planting range is expanded (1 min).

(3)① Gravel layer can effectively reduce water evaporation (1 min) ② Gravel can increase the daily temperature difference of soil, which is beneficial to nutrient accumulation (1 min).

③ Gravel can reduce the loss of soil fertility caused by sandstorm (1).

(4)① Reduce the pressure of population on the ecological environment (1); (2) Reduce water consumption for groundwater exploitation and agricultural irrigation (1); ③ Reduce the waste of water resources and improve the utilization rate.

Test analysis:

(1) The drought index in this area is high, the climate is dry and water resources are scarce. There is little vegetation on the surface of the basin, and the ecological environment is fragile. Once it is destroyed, it is difficult to recover.

(2) The trend of climate change in this basin is that the temperature is gradually rising, the drought degree is getting higher and higher, the planting area of spring wheat is reduced, and the planting range is narrowed. Because it is a cold-loving, cold-resistant and water-demanding crop. The planting area of corn is increasing year by year, and the planting range is expanding, because it is a kind of crop that likes temperature and drought.

(3) The answer to this question is mainly from three aspects: the influence of gravel cover on water, heat and soil conditions in Gua Tian. Gravel layer can effectively protect groundwater and reduce water evaporation. Gravel layer can increase the daily temperature difference of soil and is beneficial to nutrient accumulation. Gravel can slow down the wind speed, thus reducing the loss of soil fertility caused by sandstorm.

(4) Close some mechanical wells, reduce groundwater exploitation, reduce agricultural irrigation water consumption, popularize drip irrigation technology, reduce water waste, improve resource utilization, carry out ecological migration, and reduce the pressure of population on the ecological environment.