Carbon Transformation And Its Influence On Soil Characters During Dictyophora Growth Period

Carbon material is the important nutrition source of edible mushroom cultivation process.It is the material of carbohydrate and ammo caid to maintain the growth of important energy source. Carbon emission is big during the edible mushroom growth process.Thus it is necessary to analysis the carbon emission flux and action regularity. This research provides the technology basis and scientific significance. We use dictyophora as the object in this study, and we do a research on the different characteristics of cabon material transformation, CO2fluxes in two planting models, and effect of planted process on the soil properties. Trials were set up into three different treatments:Dictyophora traditional cultivation pattern(CT), Dictyophora inter planting cultivation mode(TZ)and Citrus trees planted(CK). The results are as follows:(1) With the passage of cultivation time in dictyophora growing, the carbon content, nitrogen content and C/N in composts continue falling, while phosphorus content increasing volatility, three kinds of wood fibers are reducing. Dissolved organic carbon in composts increasing at first stage and reducing latter. Dissolved organic nitrogen has a different tendency that reducing at first stage, and increasing latter, then reducing again. Microbial biomass carbon content and microbial biomass nitrogen content are in same tendency, showing a bimodal curve, with its peak between first and second mushrooms break bud stage.(2) During the entire growth period of dictyophora, carboxymethyl cellulase and xylanase have same tendency in variation in general. In the mycelial growth stage (0-50days), both of carboxymethyl cellulase and xylanase are rising rapidly, and in mature fruit stage, enzymatic activity going to the largest, then reducing latter. Amylase activity were increased in fluctuation tendency, and to the largest in mature fruit stage.(3) Most carbon nutrition which is needed in dictyophora development can not be used by mycelium directly, but with the transformation by carbon conversion of enzyme activity. As be indicated by this research,3kinds of Carbon conversion related enzyme activity are highly conspicuous negative correlated with cellulose, hemicellulose, lignin respectively, but no significant correlated with TOC (total organic carbon).(4) Greenhouse gas emissions from the dictyophora cultivation process based on CO2, and C02emissions from the diurnal variation showed a single peak curve, which showing9:00to the lowest, and to the highest around18:00; periodic variation of the mycelium stage turn out to be a significant increasing tendency, and with downward tendency in mature fruit stage, and emission in mycelium stage is significantly higher than the mature fruit stage.(5) CO2emission flux has a significant positive correlation with carboxymethyl cellulase, xylanase, organic carbon content, the content of cellulose, hemicellulose content, cellulose/N, hemicellulose/N, microbial biomass carbon, microbial biomass nitrogen and humidity, and has a significant negative correlation with nitrogen content, but has no significant correlation with the lignin content, phosphorus content, amylase, dissolved organic carbon, and dissolved organic nitrogen. The correlation between CO2emission flux and medium temperature is more special. At the stage of mycelial growth, CO2emission fluxes are increasing as the increasing of compost temperature, showing a significant positive correlation between them; they have a diametrically opposite correlation that CO2emission fluxes are decreasing as the increasing of compost temperature, showing a significant negative correlation.The reason is that the temperature in mycelial phase is more suitable for mycelium growth, then with a higher breathing flux; and the temperature of compost is becoming higher beyond the optimum temperature for mycelial growth as the higher air temperature in fruit body growth stage, then inhibiting the growth of the mycelium and with a lower CO2emission flux.(6) Compared with test before and no dictyophora cultivation mode, dictyophora cultivated effectively increased the content of organic carbon and nitrogen in0-20cm soil. It can fastly increase the contents of DOC, DON, MBC and MBN in0-20cm soil in the cultivation period.