晋北不同华北落叶松人工林生物量碳分布特征及其与气候因子的关系  

Biomass carbon distribution patterns of different Larix principis-rupprechtii plantations in northern Shanxi and their relationship with climate factors

作　　者：李华一 韩海荣[1,2] 达安 吴会峰 LI Huayi;HAN Hairong;DA An;WU Huifeng(School of Ecology and Nature Conservation,Beijing Forestry University,Beijing 100083,China;Qilaotu Mountain National Observation and Research Station of Chinese Forest Ecosystem,Chifeng 024400,China)

机构地区：[1]北京林业大学生态与自然保护学院,北京100083 [2]内蒙古七老图山森林生态系统国家定位观测研究站,赤峰024400

出　　处：《应用与环境生物学报》2025年第1期41-52,共12页Chinese Journal of Applied and Environmental Biology

基　　金：国家重点研发计划项目(2019YFA0607304,2023YFD220040303);林业科技创新平台运行补助项目(2020132075)资助。

摘　　要：为探索气候变化下黄土高原退耕还林区人工林的固碳功能,以晋北3种林分类型华北落叶松人工林为研究对象,通过树木年轮法和生物量异速生长方程法分析不同林分类型华北落叶松生物量碳分布特征,并解析华北落叶松乔木层及其各器官碳密度年增量与气候因子的关系.结果表明:不同林分间华北落叶松碳密度年增量年际变化基本一致,其中华北落叶松-柠条混交林的碳密度增加最快,从2002年的1.11 t/hm^(2)增加到2022年的44.74 t/hm^(2).华北落叶松不同器官碳密度分布格局随林龄变化显著,幼龄林时期树枝对华北落叶松碳密度年增量的贡献最大,随着林龄的增加,树干和树根占比逐渐增大.不同林分类型华北落叶松碳密度年增量与上年7月和当年7-8月的降水呈显著正相关,与12月降水呈显著负相关;而与上年7月及当年7-8月平均气温和月均最高温呈显著或极显著负相关,与3月的平均温度呈显著正相关.气候因子对华北落叶松纯林碳密度的影响显著高于两种混交林.另外,随机森林结果表明气候因子对华北落叶松不同器官碳密度年增量的相对重要性的差异显著.综上所述,华北落叶松碳密度增量受温度与降水共同影响,其中温度的影响更显著;在未来该地区暖干化的气候变化趋势下,华北落叶松的固碳潜力可能会降低,而混交可以有效缓解气候因子对华北落叶松固碳速率的限制,是气候变化下提高碳储量、增加植被固碳能力的有效手段.(图7表2参45)To explore the carbon sequestration function of artificial forests in“grain for green”areas on the Loess Plateau under climate change,this study focused on different plantation types in North Shanxi of China,using Larix principis-rupprechtii as the main research object.Eighteen 20 m×20 m plots were set up in a 23-year-old larch plantation to investigate the biomass carbon distribution patterns using dendrochronological methods and biomass allometric growth equations.The relationship between the carbon density increments of the tree layer and each organ of L.principis-rupprechtii with climatic factors were elucidated.The results indicated that the trend of carbon density increments in different larch plantations was similar.The L.principisrupprechtii and Caragana korshinskii mixed forest had the fastest growth in carbon density,increasing from 1.11 t/hm^(2) in 2002 to 44.74 t/hm^(2) in 2022.The distribution patterns of carbon density in the different organs of L.principis-rupprechtii varied significantly with forest age.Branches contributed the most to the increase in carbon density during the young forest period.As the stand age increased,the proportion of carbon density in the trunks and roots gradually increased.The carbon density increment of different larch plantations was signiffcantly and positively correlated with precipitation in July of the previous year and July to August of the current year,whereas it was significantly and negatively correlated with December precipitation.Moreover,the carbon density increment of different larch plantations was highly signiffcantly,negatively,or signiffcantly and negatively correlated with the average and maximum temperatures in July of the previous year and July to August of the current year,however,signiffcantly and positively correlated with the average temperature in March of the current year.The random forest results showed that climatic factors exhibit varying degrees of importance in inffuencing the increment of carbon density in different organs.In conclusi

关 键 词：黄土高原 林分类型 华北落叶松 碳密度 气候因子 

分 类 号：S718.5[农业科学—林学]