热带亚热带植物学报2026，Vol.34Issue(2)：125-134,10.DOI:10.11926/jtsb.4995
南亚热带桉树混交林土壤酶活性及其化学计量比特征
Soil Enzyme Activity and Stoichiometry of Eucalyptus Mixed Plantations in Subtropical China
摘要
Abstract
In response to declining productivity in Eucalyptus monoculture plantations,the 18-year-old pure E.urophylla plantations and Eucalyptus-native mixed plantations with native tree species proportions of 20%,30%,40%,and 50%in Heshan,Guangdong were investigated.By measuring the biomass and carbon(C),nitrogen(N),and phosphorus(P)contents of litter,as well as the pH,C,N,P contents,soluble C and N contents,and microbial C and N contents in the 0-10 and 10-20 cm soil layers,and the activities of β-D-glucosidase(BG),N-acetylgluco-saminidase(NAG),and acid phosphatase(AP),the relationship between soil enzyme activities and their stoichiometric ratios and the physical and chemical properties of litter and soil was explored.The results showed that with the increase of the proportion of native tree species,the activities of BG and NAG in the 10-20 cm soil layer first decreased and then increased,while the activities of AP in both the 0-10 and 10-20 cm soil layers first decreased and then increased.The C:P and N:P ratios of enzymes first increased and then decreased.The mixed plantations to some extent alleviated the carbon and nitrogen limitations of soil microorganisms,improved soil fertility,and promoted microbial activity.Correlation and redundancy analysis indicated that the soil enzyme activities and their stoichiometric ratios in the 0-10 cm soil layer were mainly related to the properties of litter,while in the 10-20 cm soil layer,they were mainly related to the physical and chemical properties of soil.This study clarified the pathways of mixed plantations in improving soil nutrient status,regulating soil enzyme activities,and their differential regulation in different soil layers,which has application value for guiding the transformation of low-efficiency Eucalyptus plantations and the management of mixed plantations.关键词
桉树纯林/桉树-乡土树种混交林/土壤酶活性/土壤酶化学计量比Key words
Pure Eucalyptus urophylla forest/Mixed forest of Eucalyptus and native tree species/Soil enzyme activity/Soil enzyme stoichiometry引用本文复制引用
张瑞,温达志,张玲玲,张恒,郭汝凤,郑娅红,罗先真..南亚热带桉树混交林土壤酶活性及其化学计量比特征[J].热带亚热带植物学报,2026,34(2):125-134,10.基金项目
国家自然科学基金项目(32201406,32471679) （32201406,32471679）
博士后特别项目(2024T170938)资助 This work was supported by the National Natural Science Foundation of China(Grant No.32201406,32471679),and the Project for Postdoctoral Science of China(Grant No.2024T170938). （2024T170938）
