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| Spatial distribution and comprehensive utilization potential of four main types of straw and livestock manure in Jiangsu Province |
| Received:March 04, 2023 |
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| KeyWord:agricultural waste;resource utilization;straw;livestock manure;spatial hotspots |
| Author Name | Affiliation | | JIANG Xiaosan | College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | | LU Mengfan | College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | | LIU Yan | College of Public Administration, Nanjing Agricultural University, Nanjing 210095, China | | LI Hanci | College of Public Administration, Nanjing Agricultural University, Nanjing 210095, China | | YUAN Shirui | College of Public Administration, Nanjing Agricultural University, Nanjing 210095, China | | LIN Bozheng | College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China |
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| Abstract: |
| To clarify the distribution pattern of agricultural waste resources in Jiangsu Province and evaluate their utilization potential, promote the resource utilization of agricultural waste, and assist in the comprehensive green transformation of agriculture, In this study, we used GIS to construct a data batch processing model, which was applied to calculate the production of straw from four crops, namely, rice, wheat, corn, and rapeseed, as well as manure derived from four livestock/poultry sources, including pigs, cows, sheep, and poultry, in different districts and counties. The theoretical values of the potential utilization of fertilizer and energy are also analyzed. On the basis of the findings of hotspot analyses, we proposed policy recommendations for the comprehensive utilization of agricultural waste in Jiangsu Province. The results revealed that in 2020, the total amount of straw collected from the four main crops in Jiangsu Province reached 39.720 0 million tons, mainly rice and wheat straw, with production being concentrated in the northern and central parts of Jiangsu Province. Analyzing the potential of this straw for fertilizer utilization, we established that this straw was theoretically equivalent to 15.118 9 million tons of organic carbon, 120 400 tons of N, 15 900 tons of P, and 244 900 tons of K. In theory, the energy conversion of this material is equivalent to 16.175 2 million tons of standard coal or 6.5×109 m3 of biogas. The total amount of feces produced by the four main types of livestock and poultry in Jiangsu Province was 45.607 7 million tons, with poultry and pig manure being the most abundant, and production being mainly distributed along the eastern provincial border and in the northwest regions. Analyzing the potential of this manure for fertilizer utilization, we obtained theoretical values equivalent to 7.370 0 million tons of organic carbon, 311 500 tons of N, 298 600 tons of P, and 268 900 tons of K. In theory, the energy conversion of this material is equivalent to 10.369 5 million tons of standard coal or 4.9×109 m3 of biogas. At the 99% confidence level, we identified 10 hotspot counties for straw production, 7 for livestock and poultry manure production, and 5 for both straw and livestock/poultry manure production in Jiangsu Province. Hotspot counties for straw production should adopt suitable utilization measures based on the main types of straw, including direct return to the field, production of feed, production of agricultural and sideline products, and edible fungi. Hotspot counties for livestock and poultry manure production are suitable for implementing a recycling model centered on fecal treatment. Dual straw/livestock manure hotspot counties have important advantages in utilizing the combination of planting and breeding to establish a multi-level, diversified, and comprehensive utilization pattern. In addition, Jiangsu Province should establish resource collection and processing centers in a hierarchical and classified manner based on resource aggregation, and synchronously optimize the province's collection, storage, and transportation network. |
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