Response of Soil Physicochemical Properties and Microbial Community Composition in Larix olgensis Plantations to Disturbance by a Large Outbreak of Bark Beetle

Forests, Journal Year: 2024, Volume and Issue: 15(4), P. 677 - 677

Published: April 9, 2024

Forests are affected by a wide range of disturbances globally, resulting in the decline or death large areas them. There is lack comparative studies on how soil properties change forests that die under influence disturbances, especially considering different levels disturbance. For this study, we took Larix olgensis—a major plantation forest species northeast China—as research object, one which outbreak bark beetle led to large-scale death, and set up fixed sample plots characterized disturbance intensities. We investigated responses physicochemical microbial community compositions intensities through determination nutrient indices high-throughput sequencing. The results show there were significant differences (p < 0.05) effects properties, where moisture content, total nitrogen, carbon, phosphorus control group significantly higher than those disturbed groups. pH was highest low-intensity potassium content high-intensity At intensities, found group. Proteobacteria, Actinobacteria, Verrucomicrobia, Acidobacteria, Candidatus_Rokubacteria, Chloroflexi, Gemmatimonadetes, Thaumarchaeota dominant populations with abundances; meanwhile, relative abundance Bacteroidetes, Tenericutes, tentatively unclassified fungus differed across Among populations, Acidobacteria showed negative correlation positive correlations nitrogen Firmicutes Gemmatimonadetes carbon soil. Furthermore, key factor driving changes communities. study provide scientific basis for long-term tree mortality caused insect pests communities their response mechanisms, great theoretical value establishment effective methods woodland restoration.

Language: Английский

Conservation Implications of Vegetation Characteristics and Soil Properties in Endangered Mangrove Scyphiphora hydrophyllacea on Hainan Island, China

Sustainability, Journal Year: 2024, Volume and Issue: 17(1), P. 191 - 191

Published: Dec. 30, 2024

Scyphiphora hydrophyllacea is an endangered mangrove species in China. Over-exploitation and coastal development have drastically reduced its distribution population, now limited to the Qingmei Port (Sanya) Qinglan (Wenchang). Despite critical status, research on ecological roles remains limited. This study examines characteristics of S. communities their relationship with soil properties. A total 17 from 11 families 14 genera were recorded. TWINSPAN classification identified two distinct community types: community. Significant biodiversity differences found only tree layer, no shrub or herbaceous layers. The importance value within arbor layer exhibited variability across communities, serving as associated a dominant community, suggesting potential barriers natural regeneration. Redundancy analysis (RDA) revealed that key factors influencing hydrophyllacea’s include electrical conductivity (EC), phosphorus (TP), nitrogen (TN), organic content (SOC), carbon/nitrogen ratio (C/N). We propose high salinity deficiency may act limiting regeneration hydrophyllacea.

Language: Английский