Study On The Cyclical Pattern Of Phosphorus Element In The Suburb Field In The Middle Of Jilin Province

The study applies the method which combines the date of investigation,document analysis and statistical analysis.The study object is the agricultural ecosystem of Liming Village.Decide the phosphorus cycle by the phosphorus equilibrium assay of different plant and cultivate system from farmland,prologue,family nutrition and environment.The main conclusions as follow:(1)Liming Village is located in the east suburb of Changchun whose management pattern is related agriculture with pasture.The tillage of the whole village is 150hm~2.Among the total,the tillage planted corn is about 125 hm~2,the economic crops is about 25hm~2.The pig and the cow are the main cultivated spaces.The annual yield of the pig is 3,500,the meat is 450 t,the milk is 1,125 t.Pure agricultural farmers of the village are 316 households,agricultural concurrently industry are 225 households,non- agricultural concurrently industry are 126 households,non- agricultural are 95 households.(2) Via the investigation of the crop of different plant structure in Liming Village,the phosphorus element was at earning condition.The earning condition of corn in 2006 and 2007 were 166%and 179%,the earning condition of economic crops in 2006 and 2007 distinction were 65%and 79%,two staple crops' earning has the tendency which increased year by year.From 2006 to 2007,the input of phosphate fertilizer in Liming Village was in creasing,the averages of each hectare were 123kg and 125kg.And the main input was chemical fertilizer respectively was 15010kg and 15447kg,the rates of organic fertilizer were 18%and 15%. The outputs of phosphorus were 9190kg and 9447kg.(3) Livestock production system discharges phosphorus into environment is higher than farmland.In 2006, the emission of phosphorus was 2355kg;the emission of 2007 was 3291kg increasing year by year.The phosphorus from pig feces and cow feces is the main emission.In 2006 and in 2007,the phosphorus from animal products were 2016kg and 2766kg.Meanwhile,the feces were respectively 5304kgand 8708kg.But the feces and urine to field was decreased year by year,in 2006,the reducing rate of feces and urine was 22%and in 2007 was 13%.(4) The living standard of Liming Village increased year by year.Population changed little,the rate of animal food was increased,the amounts of pork,egg and mile were increased,the phosphorus of family system was balance on the whole.(5) The phosphorus cycling model in Liming Village mainly was that the input was higher than the output. In the overall system,the massive chemical fertilizers and the feed were inputted,carrying massive phosphorus in the system.The output was mainly by the animal living organism and feces,the massive feces cannot enter the circulatory system to create the overall system phosphorus element earnings.(6) The influence of phosphorus element earnings was obvious.The straw,the feces and the domestic waste were stacked everywhere which lead to the disequilibrium of the whole system,water eutrophication, air pollution.In order to improve the environment situation,organic agriculture and inorganic agriculture must be combined.The coordination of farming and animal husbandry can provide conditions for sustainable development.