Subjects: Agriculture, Forestry,Livestock & Aquatic Products Science >> Plant Protection submitted time 2018-07-18 Cooperative journals: 《广西植物》
Abstract： The extractable humus carbon of the litter can change with the rhythm of the plant growth and the phenological period, and then affect the material circulation process. Understanding of the changes in the extractable humic carbon content during the phenological period are of great significance for the in-depth understanding of the features of the litterfall-supported regional ecosystem cycle, but they lack attention. Therefore, Quercus acutissima, Phoebe zhennan, Cryptomeria fortune, and Camptotheca acuminatain were selected in the Rainy Area of West China. The different types of litters in the leaf budding period, leaf expanding period, leaf maturing period, and leaf falling period were dynamically collected through fixed-point analysis of the differences in the extractable humic carbon (HC) humic acid carbon (HAC), fulvic acid carbon (FAC), and humic acid carbon/fulvic acid carbon (HAC/FAC). The results show: that the contents of HC and HAC in leaf litter were the highest in the same critical period, and they all showed as leaf litter> twig litter> fruit litter, and showed that the evergreen tree species was not significant but the deciduous tree species was significant; Compared with other periods, leaf litter of the four tree species exhibited high FAC content during the leaf expanding period, However, HAC content and FAC content of twig litter and fruit litter in phenological stages are greatly affected by species. Humic acid carbon/Fulvic acid carbon (HAC/FAC) in leaf litter of four tree species to characterize the relative content and formation rate of humic acid, fulvic acid during the humification of leaf litter, there was no significant difference between organs, showing that the deciduous tree species had lower HAC/FAC than evergreen tree species. The present study shows that stage types, species types, organ types and their interactions have different degrees of influence on HC, HAC, FAC content and HAC/FAC in litter. The results provide a theoretical basis and a new direction for further understanding the material circulation process of litterfall in the regional ecosystem.
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