Pattern changes of Carbon-cycling enzyme activities as influenced by different C and N availability of organic materials
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The incubation study was conducted to investigate temporal pattern of changes along decomposition time of C-cycling enzyme activities in response to different chemical compositions of organic materials, particularly concentrations of C and N in residues applied. The experiment was divided into 4 treatments: 1) control (untreated soil), 2) soil + rice straw, 3) soil + biochar compost, and 4) soil + biochar. Experimental design was Randomized Complete Block design with 3 replications. The peak CO2-C production at day 0 (3 h) of incubation was the highest in the rice straw treated-soil (36.1 mg CO2-C kg/day) followed by biochar (33.1 mg CO2-C kg/day) and biochar compost (32.2 mg CO2-C kg/day). The highest cumulative CO2-C production (0.78 mg CO2-C /kg soil) was also observed in the soil + rice straw treatment. Increases in oxidizable organic C were positively correlated with CO2 losses (r = 0.6656***), while microbial biomass C was also governed by CO2-C production (r = 0.6553***). During the first 21 days of incubation, oxidizable organic C showed negative correlation with specific phenoloxidase (r = -0.7566***) and peroxidase (r = -05203**). Throughout the decomposition period, specific B-glucosidase activity showed positive correlation with N contents of organic materials both the initial to middle (r = 0.5673***), and the middle to later (r = 0.7653***) stages of decomposition. In addition, during the later period of decomposition, a positive correlation between total N and specific phenoloxidase activity was also observed. This study showed that C compounds degrading enzymes were influenced by C and N availability of organic materials in which the prominent parameter is N content. Our study also supported the positive role of N in regulating specific activity in degrading recalcitrant C compounds.
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