Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 818, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2021.151742
Keywords
Tropical forest; Forest conversion; Microbial biomass; Microbial residues; Plantation; Secondary succession
Categories
Funding
- National Natural Science Foundation of China [31988102]
- National Key Research and Development Program of China [2017YFC0503906]
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Land-use change has significant impacts on soil organic carbon storage and microbial residue C accumulation in the tropics. Secondary forest has higher SOC than primary forest, but no difference in microbial residue C concentration, suggesting slow microbial-derived C accrual during secondary succession. Prunus salicina plantation and tea plantation have lower SOC than secondary forest, with lower fungal and total residue C concentrations in the tea plantation, indicating microbial-derived C loss following forest conversion. Litter standing crop affects microbial residue C concentration by regulating fungal biomass and hydrolytic enzyme activities.
Land-use change can lead to profound changes in the storage of soil organic carbon (SOC) in the tropics. Soil microbial residues make up the majority of persistent SOC pools, yet the impact of land-use change on microbial residue C accumulation in the tropics is not well understood. Here, we investigated how the conversion of tropical primary montane rainforest to secondary forest and the conversions of secondary forest to Prunus salicina plantation and tea plantation, influence the accumulation of soil microbial residue C (indicated by amino sugars). Our results showed that the secondary forest had a higher SOC than that of the primary forest (+63%), while they had no difference in microbial residue C concentration, indicating a relatively slow microbial-derived C accrual during secondary succession. Moreover, the P. salicina plantation and tea plantation had lower SOC than the secondary forest (-53% and -57%, respectively). A decrease in fungal biomass (-51%) resulted in less fungal and total residue C concentrations in the tea plantation than in the secondary forest (-38% and -35%, respectively), indicating microbial-derived C loss following the forest conversion. The change in microbial residue C depended on litter standing crop rather than soil nutrient and root biomass. Litter standing crop affected microbial residue C concentration by regulating fungal biomass and hydrolytic enzyme activities. Taken together, our results highlight that litter-microbe interactions drive microbial residue C accumulation following forest conversions in the tropics.
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