Abstract
In this paper, we selected the northeast region as a study area from the perspective of soil nutrient demand, calculated the livestock carrying capacity of farmland under three scenarios where nitrogen nutrient accounts for 35% (low level), 45% (medium level), and 55% (high level) of fertilization, and carried out a risk analysis. The results show that the scale of husbandry breeding is expanding and the scale of the planting industry has remained basically unchanged. Under the three scenarios, there were 23 regions where the livestock manure exceeded the maximum value that could be absorbed by farmland in 2008 and 28 regions in 2019. These regions in the potential area are mostly located in Heilongjiang province and the regions in the restricted area are mostly located in Liaoning Province. On the whole, the northeast region is generally faced with the problem of livestock overloading, and the insufficient utilization and treatment capacity of livestock manure poses a huge threat to regional ecological security. Based on this, adjusting the structure of regional planting and breeding, promoting the development of the livestock manure processing industry, enhancing the production capacity of organic fertilizer, and constructing an integrated pattern of regional planting and breeding are effective ways to realize the sustainable utilization of farmland in northeast China.
Highlights
IntroductionFarmland is a crucial agricultural resource and production factor, and the key to ensuring food production
The northeast region is gradually evolving from an “ecological functional area” to an “ecologically fragile area”, and problems such as the degradation of physicochemical properties and ecological functions have become increasingly prominent, posing a serious threat to the stability of the national food security foundation and regional ecological security [5–7]
We selected the northeast region as the study area from the perspective of soil nutrient demand; calculated the livestock carrying capacity of farmland under three scenarios where nitrogen nutrient accounts for 35%, 45%, and 55% of fertilization; and carried out a risk analysis
Summary
Farmland is a crucial agricultural resource and production factor, and the key to ensuring food production. The northeast region is an important grain production base in China [1]. This region is endowed with rich black soil resources, and is one of the four largest black land regions in the world, where it is very suitable for farming [2]. The northeast region has made an outstanding contributions to ensuring national food security and is known as China’s first granary. If coupled with the large-scale discharge of livestock manure and other wastes, pollutants from the planting and breeding industries entering the environment will greatly exceed the carrying capacity of the farmland, which will create serious pollution problems [8,9]
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