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Research and evaluation: what are the advantages and disadvantages of soybean import to China's resource cultivated land environment

release date: Source: Beijing

in recent years, China's soybean imports have been increasing, accounting for 90% or more of domestic soybean consumption; On the other hand, domestic soybean planting has been replaced by other crops with better yield and economic benefits, which has a comprehensive impact on China's grain, water resources, arable land, environment and so on. Graphene is a new member of the graphite family. The yangyonghui research group of the agricultural resources research center of the Institute of genetics and developmental biology of the Chinese Academy of Sciences analyzed the comprehensive impact of soybean cultivated land conversion to other crops and soybean import on China's grain, water resources, cultivated land, etc. by constructing the correlation between China's land water resources food nitrogen and other factors under the background of soybean import. Through the research, the following conclusions are drawn:

from the perspective of sowing scale and yield, compared with 2004, the sown area of soybeans in China decreased by 25% (35.85 million mu) in 2016, and the domestic soybean yield decreased by 26%. Print out medium temperature, pulse times and pulse pressure waveform; At the same time, the length of gate transition section should be as short as possible (4.46 million tons); 70%, 20%, 3% and 7% of the sown area of soybeans were converted into corn, rice, vegetables and fruits. As the output of these crops is generally higher than that of soybeans, the output of these crops has increased by 10.42 million tons, 3.34 million tons, 2.49 million tons and 3.26 million tons respectively, and the grain output increase brought by corn and rice alone is as high as 9.3 million tons (about 1.5% of the total grain output in 2016)

in terms of resources and environmental impact, after changing to other crops, the consumption of water resources increased by 3.05 billion cubic meters, partially intensifying the pressure on water resources; Soybean is a nitrogen fixing crop, and the farmland nitrogen balance is negative. The conversion of soybean to other crops has increased the amount of nitrogen fertilizer by 257000 tons, increasing a certain amount of ecological environmental pressure; Soybean imports have eased the pressure on China's cultivated land by importing virtual water (52 billion cubic meters) and virtual cultivated land (527 million mu)