Research Based On Arable Land Consumptive On Environmental Carrying Capacity Of Livestock And Poultry Excrement In Shandong Province

With the development of economic and social in China,the level of per capita consumption has been increasing with the growth of the whole economy.It has promoted the development of the aquaculture industry,and produced a large amount of livestock manure and various pollutants,directly or indirectly caused water and air pollution,and pose threats to human health.Since 1995,research on animal manure has aroused extensive attention in the academic circle.At present,the harm of livestock manure to the environment,prevention technology and environmental costs calculation has become the focus of attention and research in various countries.However,there are few reports on the environmental carrying capacity of livestock and poultry manure under the provincial scale.In order to clarify the magnitude and threat degree of the environmental carrying capacity of livestock manure at the provincial scale,this article takes the large agricultural province of Shandong Province as the research area,and studied the research literature of domestic and foreign research on livestock and poultry manure pollution,and finally determined the environmental carrying capacity of livestock and poultry manure based on cultivated land consumption as the research topic of this paper.The discharge and environmental carrying capacity of livestock and poultry manure in Shandong Province in 2016 were estimated by using the method of sewage coefficient,which is more mature at present.It also compares and analyzes the manure time trends and spatial distribution from 1993 to 2016 based on the research results.The analysis of the scene is as follows:(1)In 2016,the livestock manure in Shandong Province was 241 million 193,800 tons,of which the livestock manure then was 120.94 million tons,which accounted for 50.15% of the total output,and the livestock manure production of the pigs was the highest.Weifang is a prefecture-level city in Shandong Province with the largest amount of livestock and poultry excrement.In 2016,the maximum and minimum values of livestock manure production(pig manure equivalent)differed by 18 times in different cities.The amount of feces produced by different prefectural cities is quite different in that year.Livestock and poultry excrement averages 31.65 tons per hectare.The total amount of livestock and poultry excrement was higher than livestock and poultry excrement,of which the prefecture-level city was 7.(2)In 2016,the production of livestock manure pollutants in 2016 was 9,801,600 tons of COD,8,497,000 tons of BOD,ammonia nitrogen 906,000 tons and 46,000 tons TN and 93.02 million tons of TP.Weifang City ranks first in the province's prefecture-level cities of various pollutants.In 2016,the average COD of livestock and poultry manure in Shandong Province was 1.29 tons/ha,the average BOD was 1.12 tons/ha,the average NH3-N was 0.12 t/ha,the average value of TN was 0.05 t/ha,and the average TP was 0.12 tons/ha.(3)In 2016,the average load value of livestock and poultry manure in Shandong Province was 31.02 tons/ha.The average value of the pre-warning value of arable manure load was 0.78,and the alert level was III,indicating that livestock and poultry manure pose a threat to the entire environment.From 1993 to 2016,the change trend of animal manure(animal excrement equivalent)in livestock was consistent with the trend of storage(yield),and was directly proportional to the relationship between manure volume and livestock volume.The spatial variation of livestock manure production has obvious characteristics.The spatial variation of interannual space between cities at the same level is more pronounced,and the spatial distribution of different cities in different years varies.(4)Survey results of livestock manure treatment in Qingzhou City,Weifang City,Shandong Province investigation results in Fujian Province and Heilongjiang Province Animal husbandry households in Shandong Province Livestock and poultry excreta treatment Biogas return to local greenhouses vegetables depend mainly on manure cultivation.The author finally reached the conclusion of pollution prevention and control of livestock and poultry breeding waste in Shandong can be targeted from the "problem-oriented,policy guidance,guarantee implementation and technical support," implementing reform policies pertinently,carry out to the household,prevent and control livestock and poultry excrement contamination effectively.