Decomposition rate and C,N,P release dynamics of pruning litter from different tea varieties
A 360-day decomposition experiment was conducted to clarify the effect of initial chemical composition of pruning litter of different tea varieties on litter decomposition and nutrient release.The study material was the pruning litter of four typical tea varieties in the low mountain and hilly areas of western Sichuan:Camellia sinensis"Fuding Dabaicha","Chuancha"No.3,"Chuanmu"No.217,and"Chuannong Huangyazao".The results showed that the half-life of the decomposition of the pruning litter from the four tea varieties was 1.20～1.43 years.The rate of mass loss was highest in the early stage(0-120 days)and lowest in the late stage(121-360 days).The pruning litter of"Chuanmu"No.217 and"Fuding Dabaicha"decomposed at a rate that was 11.7%-18.5%higher than that of"Chuancha"No.3 and"Chuannong Huangyazao".The C content as well as the concentration of cellulose and lignin concentration of the initial litter material were the main factors affecting the mass loss rate.The C and P of the pruning litter was released directly.The N contained in the pruning litter of"Fuding Dabaicha"and"Chuancha"No.3 was released directly,whereas N was released from"Chuanmu"No.217 and"Chuannong Huangyazao"in a"leaching-enrichment-release"mode.The release of C,N,and P from tea plantation litter varies depending on the tea variety and decomposition period and is affected by the initial N and P content.At the end of decomposition experiment,the C and N in the pruning litter of"Chuannong Huangyazao"and C.sinensis"Fuding Dabaicha"was released faster than was the P in pruning litter of"Chuancha"No.3 and"Chuanmu"No.217.The total nutrient release from the pruning litter of all four tea varieties was 36.1%-44.5%of the initial C content,53.8%-58.3%of the N,and 65.4%-71.5%of the P.Therefore,composting and other methods should be considered to promote the degradation of lignin and cellulose during the return process of pruned leaves.Appropriate nitrogen application should be applied after pruned leaves to inhibit the release of N element and improve the nutrient use efficiency of pruned leaves.
tea varietytea pruning litterdynamics of decompositionnutrient release
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