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Plantations thinning: A meta-analysis of consequences for soil properties and microbial functions

稀释 微生物种群生物学 环境科学 营养物 生物量(生态学) 土壤呼吸 农学 生态系统 营养循环 植物凋落物 土壤有机质 土壤科学 化学 土壤水分 生态学 生物 细菌 遗传学
作者
Xiulan Zhang,Liang Chen,Ying Wang,Peiting Jiang,Yanting Hu,Shuai Ouyang,Wenhua Xiang,Pifeng Lei,Yakov Kuzyakov,Wenhua Xiang
出处
期刊:Science of The Total Environment [Elsevier]
卷期号:877: 162894-162894 被引量:13
标识
DOI:10.1016/j.scitotenv.2023.162894
摘要

Thinning is a widely-used management practice to reduce tree competition and improve wood production and quality in forest plantations. Thinning affects the soil ecosystem by changing the microclimate and plant growth, as well as litter inputs above and belowground, with all the resulting consequences for microbial communities and functions. Although many case studies have been carried out, a comprehensive understanding of the thinning effects on soil properties and microbial communities and functions in plantations remains to be explored. In this study, a meta-analysis was performed on 533 paired observations based on 90 peer-reviewed articles to evaluate the general responses of soil (mainly 0–20 cm depth) physicochemical properties, microbial biomass and community structure, and enzyme activities to thinning. Results showed that thinning increased soil temperature (13 %), moisture (8.0 %), electric conductivity (13 %), and the contents of total nitrogen (TN, 4.1 %), dissolved organic carbon (DOC, 9.7 %), nitrate N (NO3−–N, 27 %) and available phosphorous (22 %). For microbial properties, thinning decreased the fungi to bacteria ratio (F:B, −28 %) and the gram-positive bacteria to gram-negative bacteria ratio (G+:G−, −12 %), while increased microbial biomass C (7.1 %), microbial respiration (13 %), and nutrient-cycle related enzyme activities, including phenol oxidase (14 %), cellobiohydrolase (21 %), urease (10 %), and acid phosphatase (9 %). In particular, moderate thinning (30–60 % intensity) has higher conservation benefits for soil C and nutrients than light and heavy intensity, thus being recommended as the optimal thinning activity. This meta-analysis suggests that thinning consistently altered soil properties, shifted microbial community compositions from K- to-r strategist dominance, and stimulated microbial activities. These results are essential for optimizing plantation thinning management and provide evidence for applying the macro-ecology theory to ecosystem disturbance in soil microbial ecology.
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