Do you have any suggestions on urban management for the 2022 NPC and CPPCC Olympic Games?

One of the suggestions chosen is resource constraints. On the one hand, the total amount of water resources is short and the utilization efficiency is not high. In recent years, the proportion of agricultural water consumption and the actual average water consumption per mu of cultivated land in China have been declining, but it is still a "big water user". In 2020, agricultural water consumption will account for 62. 1% of the total water consumption in China. There is still a big gap between the effective utilization coefficient of farmland irrigation water and the international advanced level. On the other hand, arable land resources are less per capita, high quality and exploitable; The traditional grain production mode with high input and overload has caused the characteristics of "three big and three low" cultivated land quality, such as large area of middle and low yield farmland, large degraded area, large polluted area, low organic matter content, low level of supplementary cultivated land and low basic soil fertility.

The second is environmental constraints. Due to the intensification of global climate change, the change and distribution of climate variables, including precipitation, temperature, humidity, wind speed and sunshine hours, have a far-reaching impact on food production. If climate change expands the adaptive area of pests and diseases, it may not only reduce grain production in a large area, but also increase the use of pesticides; Natural disasters such as high temperature, heavy precipitation, drought and flood caused by climate change have greatly impacted the regional grain supply system and increased the instability of grain production. Agricultural non-point source pollution greatly restricts the improvement of grain production level. Excessive application of chemical fertilizer and unreasonable disposal of crop straw, livestock manure and urine will lead to the decline of farmland quality and even the loss of production capacity.