Transformation Of Phosphorus And Organic Carbon And Their Interaction In Greenhouse Vegetable Soil

Currently, greenhouse vegetable industry has a obvious contribution on enriching thefood basket of inhabitant, solving the problem of vegetable’s lackless and improving theincome of inhabitant. It has become a important model to ease the contradiction of a largepopulation with relatively little land. The chemical precesses of greenhouse soil aredifferent from the natural soil cause by human activities. In the research,we use thegreenhouse soil as the research object and select four representative organic materials andphosphorus-containing. By the indoor simulaton experiment, we have studied thetransformation between phosphorus and organic carbon and their interaction ingreenhouse vegetable soil. We mainly draw the following conclusions:(1) Organic material influenced the variation of Olsen-P and CaCl2-P content ingreenhouse soil. The glucose reduced Olsen-P and CaCl2-P content by5.3%~32.4%and14.9%~53.3%, respectively. Citric acid significantly increased the Olsen-P and CaCl2-Pcontent in neutral soil, and reduced the CaCl2-P content in acidic soil. Straw made theOlsen-P content in neutral greenhouse soil reduced by16.3%~19.0%. Organic materialpromoted the formation of MBP in greenhouse soil. Soil MBP formed in neutralgreenhouse of promoting effect from big to small order: citric acid, straw, glucose andturf.(2) Organic materials reduced Al-P, Fe-P and O-P accounts for the the totalphosphorus’ proportion, increased the MROP’s proportion and reduced the the HROP’sproportion in greenhouse soil, overally. There were transformaton between Olsen-P、CaCl2-P、Fe-P and Al-P、O-P、Ca-P、MLOP.(3) Exogenous phosphorus increased DOC content of greenhouse soil. Calciumdihydrogen phosphate and calcium-magnesia phosphate fertilizer reduced the ROOCcontent. Exogenous phosphorus inhibited the formation of MBC in greenhouse soil,overally. Exogenous phosphorus reduced the FA content in soil, and increased HA/FA.Poultry manure decrased FA content by88.7%~90.6%and increased HA/FA by8.9~9.8,which was the most obvious.(4) Both of Organic materials and phosphorus materials reduced the MBC/P ingreenhouse soil,and improved the potential of soil microbial to release phosphorus.Olsen-P was advantageous to increase thecontent of active soil organic carbon and. Thesoil phosphorus removed to active phosphorus, such as Olsen-P、MBP、Fe-P and LOP; as well as to a more stable state phosphorus, such as HROP. The soil FA improved to Ca-P’sproportion of the total phosphorus.(5) The soil pH influenced the change of MBP、Olsen-P and CaCl2-P in greenhousesoil, largestly,and reached significant level. The interaction of carbon species andtemperature influenced the degree of variation of soil MBC, largestly. The carbon speciesinfluenced the degree of variation of soil DOC, largestly. The interaction of phosphorusspecies and temperature influenced the degree of variation of soil ROOC, largestly, all ofthem reached the significant level.