Abstract: The litter decomposition bag method was used to analyze the decomposition of five single litter types and nine mixed litter types in Guizhou Jiu'an Ecological Tea Garden with Cinnamomum glanduliferum, Betula luminifera, Cunninghamia lanceolata and Pinus massoniana leaf litters and Camellia sinensis trims as the research objects. The decomposition rate and release characteristics and differences of lignin and cellulose were studied. The results show that in a single type of litter, the litter decomposition rate of broad-leaved species was higher than that of coniferous species. The lignin content of litter of broad-leaved species showed an increasing trend. While that of coniferous species showed a downward trend as a whole. The content of cellulose in litter also showed a decreasing trend. According to the analysis of the release law of lignin and cellulose, both single litter release law and mixed litter cellulose release law were direct release. There were three release laws for single litter lignin, and 5 laws for mixed litter lignin. According to the analysis of the decomposition characteristics of 9 kinds of mixed litter, 44.4% of mixed litter decomposition showed additive effect, 11.2% mixed decomposition showed antagonistic effect, and 44.4% mixed decomposition showed synergistic effect. While 22.2% of mixed litter lignin release showed promoting release, and 55.6% mixed litter lignin release promoted the enrichment. A total of 11.1% of the mixed litter cellulose appeared to promote the enrichment, and 22.2% of the mixed litter cellulose was to promote the release. This study provided a theoretical basis for further maintaining the fertility in tea gardens.

Key words: litter, decomposition characteristics, lignin, cellulose