不同经营措施对马占相思人工林土壤呼吸的影响  

The Impact of Different Management Measures on Soil Respiration of Acacia mangium Plantation

作　　者：曾伟 罗栋 史正军[1] 包江桥 张小凤 Zeng Wei;Luo Dong;Shi Zhengjun;Bao Jiangqiao;Zhang Xiaofeng(Shenzhen Fairy lake Botanical Garden,Shenzhen 518004,P.R.China)

机构地区：[1]深圳市仙湖植物园,深圳518004

出　　处：《东北林业大学学报》2024年第7期58-63,共6页Journal of Northeast Forestry University

基　　金：国家重点研发计划项目(2021YFE0193200);国家林草局林业科技创新平台运行补助项目(2009132077);广东省林业科技创新平台建设项目(2023-KYXM)。

摘　　要：以马占相思(Acacia mangium)人工林为研究对象,探讨间伐、皆伐、“皆伐+补种”、“间伐+补种”、封山育林等不同森林经营管理措施对马占相思人工林土壤呼吸的影响,明确影响土壤呼吸的关键环境因子。结果表明:采伐强度(间伐、皆伐、封山育林)、补种均对土壤呼吸速率产生显著影响,土壤呼吸速率从大到小依次为:间伐样地((3.36±0.05)μmol·m^(-2)·s^(-1))、皆伐样地((3.10±0.07)μmol·m^(-2)·s^(-1))、封山育林对照样地((2.83±0.07)μmol·m^(-2)·s^(-1));而补种后的样地土壤呼吸速率((2.73±0.06)μmol·m^(-2)·s^(-1))小于未补种样地((3.34±0.05)μmol·m^(-2)·s^(-1));不同经营管理措施的样地平均呼吸速率从大到小依次为:皆伐、“间伐+补种”、间伐、封山育林对照、“皆伐+补种”。间伐、皆伐后的林地土壤温度显著高于对照样地,而补种对土壤温度没有显著的影响。森林经营管理措施可以改变土壤呼吸速率对温度的敏感性系数(Q_(10)值)。森林经营管理措施对土壤营养元素产生显著影响,封山育林对照样地的土壤营养元素质量分数最高,“间伐+补种”样地最低。因此,在林业生产实践中,可采取合理的经营措施提升森林质量和调控森林碳循环过程。Using Acacia mangium plantations as the research object,this study explores the impact of different forest management measures such as thinning,clear-cutting,“clear-cutting+replanting”,“thinning+replanting”,and mountain closure afforestation on soil respiration in A.mangium plantations,and identifies key environmental factors influencing soil respiration.The results showed that harvesting intensity(thinning,clear-cutting,mountain closure afforestation),and replanting significantly influence soil respiration rates,with the soil respiration rates ranking from highest to lowest as follows:thinning site((3.36±0.05)μmol·m^(-2)·s^(-1)),clear-cutting site((3.10±0.07)μmol·m^(-2)·s^(-1)),mountain closure afforestation control site((2.83±0.07)μmol·m^(-2)·s^(-1)),while the soil respiration rate of the replanted site((2.73±0.06)μmol·m^(-2)·s^(-1))is lower than the site without replanting((3.34±0.05)μmol·m^(-2)·s^(-1)).The average respiration rates of sites with different management measures rank from highest to lowest as follows:clear-cutting,“thinning+replanting”,thinning,mountain closure afforestation control,“clear-cutting+replanting”.The soil temperature in the forest land after thinning and clear-cutting is significantly higher than in the control site,while replanting does not have a significant impact on soil temperature.Forest management measures can alter the sensitivity coefficient(Q_(10)value)of soil respiration rate to temperature.Forest management measures have a significant impact on soil nutrient elements,with the soil nutrient element content being highest in the mountain closure afforestation control site and lowest in the“thinning+replanting”site.Therefore,in forestry production practice,adopting reasonable management measures can enhance forest quality and regulate the forest carbon cycling process.

关 键 词：土壤呼吸速率 森林经营措施 土壤温度 采伐模式 

分 类 号：S754.5[农业科学—森林经理学]