晋西黄土区林分密度对油松人工林生物量及土壤理化性质的影响  

Effects of stand density on biomass and soil physico-chemical properties of Pinus tabuliformis forest in the loess area of western Shanxi

作　　者：贾亚倢 杨建英[1,2,3] 张建军[1,2,3,4] 胡亚伟 张犇 赵炯昌 李阳 唐鹏 JIA Yajie;YANG Jianying;ZHANG Jianjun;HU Yawei;ZHANG Ben;ZHAO Jiongchang;LI Yang;TANG Peng(School of Soil and Water Conservation,Beijing Forestry University,Beijing 100083,China;Key Laboratory of National Forestry and Grassland Administration on Soil and Water Conservation,Beijing Forestry University,Beijing 100083,China;Engineering Research Center of Forestry Ecological Engineering,Ministry of Education,Beijing Forestry University,Beijing 100083,China;Jixian National Forest Ecosystem Observation and Research Station,Beijing Forestry University,Jixian 042200,Shanxi,China)

机构地区：[1]北京林业大学水土保持学院,北京100083 [2]北京林业大学水土保持国家林业和草原局重点实验室,北京100083 [3]北京林业大学教育部林业生态工程研究中心,北京100083 [4]北京林业大学山西吉县森林生态系统国家野外科学观测研究站,山西吉县042200

出　　处：《浙江农林大学学报》2024年第6期1211-1221,共11页Journal of Zhejiang A&F University

基　　金：国家重点研发计划项目(2022YFE0104700)。

摘　　要：【目的】探讨林分密度对油松Pinus tabuliformis人工林生物量与土壤理化性质的影响,为油松人工林高质量发展和生态服务功能持续稳定发挥提供理论支撑。【方法】以山西省临汾市吉县蔡家川流域30年生油松人工林为研究对象,采用标准木法测算不同密度条件下单株生物量及林分生物量,并测定土壤理化性质,分析林分密度对油松林生物量及土壤理化性质的影响,采用冗余分析(RDA)及斯皮尔曼(Spearman)相关性分析确定油松林生物量与土壤理化性质之间的关系。【结果】①不同密度油松人工林的单株生物量和林分总生物量差异显著(P<0.05),且随林分密度的增加,单株生物量逐渐减少,林分总生物量在密度1750株·hm^(−2)时具有峰值;②不同密度油松人工林地土壤理化性质差异显著(P<0.05),其中土壤孔隙度在林分密度1750株·hm^(−2)时最大,达52.38%,林地土壤含水量在林分密度2750株·hm^(−2)时最高,达13.84%,土壤肥力状况则在林分密度1750株·hm^(−2)时最佳;③通过冗余分析及斯皮尔曼相关分析发现:土壤总孔隙度、有机碳和速效磷与林分总生物量均呈极显著相关(P<0.01),地下生物量受到土壤含水量的显著影响(P<0.05)。【结论】以固碳释氧和维持最大生产力为目的,以及以提高土壤碳汇能力和改良肥力为目的的油松林,林分密度建议维持在1750株·hm^(−2)左右的油松林;以保持水土和改良土壤蓄水性能为目的的油松林,林分密度建议维持在1750~2750株·hm^(−2)。[Objective]This study is in order to explore the effects of stand density on biomass and soil physicochemical properties in Pinus tabuliformis forests,for high-quality development and performance of the ecological service function.[Method]A 30-year-old P.tabuliformis forest in Caijiachuan watershed,Jixian County,Shanxi Province,was used as the research object,and the standard wood method was used to measure the biomass of individual plants and the overall biomass of the sample plots under the conditions of different densities,and the soil physicochemical properties were determined,so as to analyze the effects of stand density on the biomass of P.tabuliformis forest and soil physicochemical properties,and to determine their relationship by redundancy analysis(RDA)and Spearman’s correlation analysis.[Result](1)The differences in stand biomass and total tree biomass between different densities were significant(P<0.05),and with the increase of stand density,stand biomass gradually decreased,and the total tree biomass had a peak at a density of 1750 plants·hm^(−2);(2)The physicochemical properties of soil in forests of different densities differed significantly(P<0.05),with soil porosity being the highest at 1750 plants·hm^(−2),reaching 52.38%,soil moisture content being the highest at 2750 plants·hm^(−2),reaching 13.84%,and soil fertility being the best at a density of 1750 plants·hm^(−2);(3)RDA and Spearman’s correlation analyses revealed that total soil porosity,organic carbon and quick-acting phosphorus were all highly significantly correlated with arbor biomass in the sample plots(P<0.01),and below-ground biomass was significantly affected by soil water content(P<0.05).[Conclusion]The stand density should be maintained at 1750 plants·hm^(−2)for the purpose of sequestering carbon and releasing oxygen and maintaining maximum productivity,and for the purpose of increasing the carbon sink capacity of the soil and improving fertility,and at 1750−2750 plants·hm^(−2)for the purpose of retaining s

关 键 词：油松林 林分密度 生物量 土壤理化性质 冗余分析 

分 类 号：S75[农业科学—森林经理学]