The land carrying capacity and environmental risk assessment of livestock and poultry breeding considering crop planting

Abstract

At present, the contradiction between survival and ecology necessitates the integration of crop planting, chemical fertilizer application and livestock and poultry breeding. Reasonably integrated crop-livestock systems (ICLSs) have become an important part of regional ecological and agricultural development. In this study, the relationship between manure nutrient demands for crops and manure nutrient supply from livestock is considered based on the balance of ICLSs in Jiangxi Province, China.The land carrying capacity index and potential of livestock breeding under uncoordinated systems are further discussed. The study also addresses water environmental risk due to surplus nutrients by integrating a traditional land carrying capacity framework and hydrological model. The results show that phosphorus absorption in land areas is the main limiting factor for the development of the livestock and poultry industries. In addition, manure nutrient demand exceeded supply in most districts, while the unbalanced regions with nutrient pollution are located in the upper and middle reaches of the Ganjiang basin. In addition, expanding the crop demand for manure or increasing the manure collection rate will help reduce environmental harm; however, attention should be paid to the risk of excessive manure returns. Additional livestock manure can be transferred to regions with developed crop planting systems.This study supports more harmonious and common ICLSs construction.

Spatial Suitability Evaluation of Livestock and Poultry Breeding: A Case Study in Wangkui County, Heilongjiang Province, China

“…In this study, a spatial suitability evaluation method for LPB was constructed. Due to the large number of distance-related indexes, when dividing the evaluation unit, it is different from using administrative divisions or land plots as the dividing unit in previous studies [6,7,20]; using hexagons for division not only improves the evaluation accuracy but also reduces the error caused by the distance-related indexes in the evaluation process. When selecting the evaluation method, the commonly used multi-criteria decision making and AHP [6,13] methods are not used.…”

“…To fulfil the growing demand for livestock and poultry products, the number of livestock and poultry farms (LPFs) has increased rapidly [2,5]. Most LPFs do not have an efficient manure disposal system, which inevitably leads to environmental problems [6,7]. Affected by water sources and transport costs, many LPFs are distributed on the banks of rivers and in rural and urban residential areas, causing water pollution and deterioration of residents' environment [8].…”

Assessing Land Resource Carrying Capacity in China’s Main Grain-Producing Areas: Spatial–Temporal Evolution, Coupling Coordination, and Obstacle Factors

“…According to Wang et al (2018), Tan et al (2021), and , population density, annual disposable income per capita, and GDP density could measure the pressure from human social and economic activities [41,43,48]. Agricultural activities in an MGPA impose pressure on land resources, the application of chemical fertilizers, pesticides, plastic film, and emissions of livestock and poultry manure per unit area of arable land could be used to assess agricultural pollution [43,44,46,49,50]. According to Luo et al (2020) and Gao et al (2022), pressure on land resources caused by industry in the MGPAs could be assessed through chemical oxygen demand emissions in industrial wastewater per unit area of land and industrial solid waste emissions per unit area of land, reflecting industrial pollution [20,47].…”

Evaluation of the local decoupling of livestock and cropland in the Huang-Huai-Hai region

“…The first option is to match the theoretical carrying capacities with the actual cropland area or breeding quantity by adjusting the ratio of manure to fertilization. The optimal ratio for mixing organic and chemical fertilizers can improve the utilization of excrement and realize zero growth of chemical pollution (Wang et al 2021a , b ; Yang et al 2021a , b ). A higher ratio of manure to fertilization (95.34%) was calculated by LCC based on nitrogen compared with a ratio of manure to fertilization (65.33%) by the AMAC based on phosphorus.…”