 Wysłany: Pią 22:32, 08 Kwi 2011 Temat postu: Population carrying capacity of land resources, Dy |
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| Population carrying capacity of land resources and application of dynamic simulation
984 years of detailed survey data, we estimate the national arable land is about 133 ~ 140 million hm, according to Liu Jiyuan 1996, Arable land in accordance with 137 million hm, consider China's climate, soil and crop type, calculated absolute potential of land resources in China total 879 800 000 tJ. Thus, even after 2030 do not take into account the trend of population decline, but also can achieve the requirements of 500kg per capita consumption of grain. Above calculations, there is no consideration of arable land cropping, cultivation techniques and new agricultural fertilizer yield potential land productivity caused by increased number of people can carry. This has fully demonstrated to our own land, to feed China's large population is a physical condition. The above analysis is essentially the same in the area of arable land,MBT schuhe preise, increasing production to make the case. However, the current rapid economic development, urbanization accelerated, so that is bound to pose a threat to the existing cultivated land. Therefore, China's grain production can not be taken lightly. In order to protect land resources, food security, we should strive to make the following aspects: First, the strict control of arable land, effectively and the quality of the dynamic balance of total cultivated land, ensure the new land of fertility; Second, in rural areas region to promote scientific farming, soil fertility continue, the implementation of precision agriculture, improve efficiency, increase food yields and cropping, play the best value of land resources; third is to adjust and guide our people's diet structure, reduce the meat in particular, pork consumption. In general, China's per capita food consumption, about 30% are used to feed pigs, cows, chickens, ducks and other poultry livestock. The consumption of livestock and poultry in the heat output of grain for direct human consumption of grain was only 1 / 20 ~ 1 / 15, according to the total meat consumption of urban residents, 80%, then 10% of urban residents is reduced by consumption of meat, then National per capita grain consumption can reduce the nearly 1%. Therefore, the protection of arable land, improve yields, and called on city residents to reduce meat consumption, is to slow the pressure of China's land resources, food security, ensure economic and social sustainable development of important measures. [ ,],[ |
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