Response Of The Soil Ciliate Community To Various Concentration Of Diammonium Phosphate (DAP)

The soil environmental factors and the community characteristics of ciliates inthe test area were studied by physic-chemical test?quantitative and qualitativemethods?and the results were listed as follows??1?Applying different concentrations of diammonium phosphate (DAP) wouldresult in changes of soil physical and chemical factors; water content would increasewith increment of fertilizing concentration;the pH whould decrease with increasingconcentration of fertilizer;Total nitrogen, organic carbon and total phosphorus contentwould more point to high, so total phosphorus, especially total phosphorus, andfertilizer concentration would significantly positively be correlated.?2?129species of ciliates were identified, belonging to9classes,16orders,28families and47genus. Analysis of community structure exhibited that Spirotricheawith41species was the most group, occupied31.8%of the total number of species;Litostomatea was the second group, occupied19.4%of the total species; Nassophoreawas the least group, occupied1.6%of the total species.The ciliates of every samplingsites had different distribution characteristics, it showed us otherness of samping sites.?3?Compared with the samping site without fertilization?soil ciliatescommunity C/P were higher in fertilizing sampling sites, and increasing along withthe increase of the amount of fertilization. It showed that with the increase ofconcentration of fertilizer, the ratio of r countermeasures and increase kcountermeasures was increased, ciliate showed its high adaptability to theenvironment.?4?Soil ciliates community applying different concentrations of DAP produceda response in diversity index of four seasons, concreted embodiment in: Diversityindexs were all above six in no fertilizing sampling sites of four seasons, which hadthe highest diversity index. Ciliates density increase, individual number of ciliates anddiversity index decreased, all along with the increase of the amount of fertilization.(5) According to the Pearson correlation of binary variables, the greatestinfluence on ciliate species number and ciliates density was total phosphorus amongvarious environmental factors. And total phosphorus was increased with the increase of concentration of fertilizer, fertilizer concentration information of ciliatescommunity had a great influence, the applying different concentrations and soilenvironmental factors on the response of the DAP?6?Using three indicators of ciliates community (ciliate species, ciliate density,diversity index), through the comprehensive evaluation method, I marked Ciliatescommunity in every sampling sites. It had the result that with the long-termfertilization, when the fertilizer concentration reached120g/m2, the communitystructure of ciliates was best in spring; While when fertilization concentration reached90g/m2, the community structure of ciliates was best in summer and autumn; Andwhen fertilization concentration reached30g/m2, the community structure of ciliateswas best in winter.To sum up, soil environmental factors and ciliates community both hadresponses because of various concentration of DAP. Various concentration of DAPchanged soil environmental factors, eventually leaded to change ciliates community(ciliates density increase, individual number of ciliates and diversity index decreased,all along with the increase of the amount of fertilization). And every season had acorresponding fertilization concentration, then ciliates community structure achievedthe best.