森林与环境学报2025，Vol.45Issue(3)：254-263,10.DOI:10.13324/j.cnki.jfcf.202412024
林下植被管理对杨树人工林土壤性质及有机碳组成的影响
Effects of understory vegetation management on soil properties and organic carbon composition in poplar plantations
摘要
Abstract
This study aims to investigate the effects of different understory vegetation management models on the soil properties and organic carbon components and screen the effective understory vegetation management model of poplar plantations.The multi-year poplar plantations were treated with four understory vegetation management models:retaining understory vegetation,removing understory vegetation,retaining a single plant species,and planting nitrogen-fixing plants.The surface soil(0-20 cm)was collected for determination of soil physicochemical properties,hydrolase activities,and content of organic carbon components.The results indicated that compared with retaining understory vegetation,removing understory vegetation reduced the content of soil water content,ammonium nitrogen(NH+4-N),nitrate nitrogen(NO-3-N),and microbial biomass nitrogen(MBN,P<0.05).The model of planting nitrogen-fixing plants showed higher NH+4-N and NO-3-N content,lower soil water content,and increased available phosphorus content(P<0.05).Retaining a single plant species maintained moderate water and nutrient content,with MBN content lower than that under retaining understory vegetation(P<0.05).The model of removing understory vegetation showcased lower enzyme activities,with β-1,4-glucosidase(BG)activity significantly lower than that under planting nitrogen-fixing plants andβ-N-acetylglucosaminidase(NAG)+leucine aminptidase(LAP)activity significantly lower than that under retaining understory vegetation.Retaining a single plant species and planting nitrogen-fixing plants increased the acid phosphatase(AcP)activity(P<0.05).Compared with retaining understory vegetation,planting nitrogen-fixing plants increased the content of soil organic carbon and easily oxidizable organic carbon(P<0.05),while removing understory vegetation had the lowest content of soil organic carbon and microbial biomass carbon(MBC,P<0.05).The soil organic carbon components were correlated with soil water content,pH value,content of NH+4-N,NO-3-N,and MBN,and activities of BG,BX and AcP(P<0.05),among which BG and MBN were the main factors affecting the changes in soil organic carbon components.In conclusion,retaining understory vegetation and planting nitrogen-fixing plants can maintain higher nutrient content and enzyme activities and increase the total organic carbon content in the soil,which is beneficial for improving soil quality and soil carbon sequestration,while removing understory vegetation demonstrates opposite effects.关键词
杨树人工林/林下植被/土壤有机碳/酶活性/土壤质量Key words
poplar plantation/understory vegetation/soil organic carbon/enzyme activity/soil quality分类
林学引用本文复制引用
石尚,于水强,喻曼曼,黄越,王国兵..林下植被管理对杨树人工林土壤性质及有机碳组成的影响[J].森林与环境学报,2025,45(3):254-263,10.基金项目
科技部国家"十四五"重点研发计划项目"森林经营措施对南方杨树人工林碳储量及其组成的影响机制(2021YFD220040203). （2021YFD220040203）
