茂兰喀斯特森林地上生物量林层格局及驱动因子  

Pattern and driving factors influencing the aboveground biomass of different forest layers of Maolan karst forest

作　　者：邓伟 车俭 毛艳娇 肖梓波 金毅 汤晓辛 DENG Wei;CHE Jian;MAO Yanjiao;XIAO Zibo;JING Yi;TANG Xiaoxin(School of Life Sciences,Guizhou Normal University,Guiyang,Guizhou 550025,China;Key Laboratory of National Forestry and Grassland Administration on Biodiversity Conservation in Karst Mountainous Areas of Southwestern China,Guizhou Normal University,Guiyang,Guizhou 550025,China;Key Laboratory of Plant Physiology and Developmental Regulation,Guizhou Normal University,Guiyang,Guizhou 550025,China)

机构地区：[1]贵州师范大学生命科学学院,贵州贵阳550025 [2]西南喀斯特山地生物多样性保护国家林草局重点实验室,贵州贵阳550025 [3]贵州省植物生理与发育调控重点实验室,贵州贵阳550025

出　　处：《森林与环境学报》2023年第2期169-176,共8页Journal of Forest and Environment

基　　金：贵州省科学技术基金项目“贵州省阔叶林群落构建特点及其驱动机制”(黔科合基础[2020]1Z013);国家自然科学基金委员会-贵州省人民政府喀斯特科学研究中心项目“喀斯特生物多样性形成和维持的钙依赖机制及其应用基础”。

摘　　要：以茂兰国家级自然保护区内喀斯特森林作为研究对象,建立森林样地并使用异速生长方程计算森林木本植物的地上生物量,采用配对t检验和线性混合效应模型等统计方法,分析森林地上生物量的林层(上木层和下木层)分布格局及驱动因子(非生物因子和生物因子)。研究发现茂兰喀斯特森林地上生物量主要分布在上木层。非生物因子中,仅岩石裸露率对森林总体地上生物量产生了负向作用,分为不同林层后,进一步发现岩石裸露率仅对上木层地上生物量产生负向作用,而对下木层则无作用;还发现地形生境的重要作用,表现为山腰上木层地上生物量大于山顶的,而山顶下木层地上生物量则大于山腰的。生物因子中,仅植株密度对上木层和下木层地上生物量产生正向作用。结果表明:茂兰喀斯特森林地上生物量受到非生物和生物因子的共同调控;若仅分析森林总体地上生物量,则难以发现不同林层地上生物量分布格局及驱动因子的差异。本研究提示对喀斯特森林地上生物量及驱动因子进行分层分析的必要性,同时也为茂兰喀斯特森林后续的经营管理提供了一定的理论基础。Exploring the patterns of forest biomass distribution and its ecological drivers may shed light on our understanding of forest ecosystem functions, and provide useful knowledge for proper forest management. Here, in the karst forest of Maolan National Nature Reserve, we established sampling forest plots and estimated the forest aboveground biomass using allometric equations. By adopting statistical methods such as the paired t-test and linear mixed-effects models, we investigated the pattern of aboveground biomass distribution for the whole forest plot as well as separately for each forest stratum(i.e. overstory or understory). and explored the underlying abiotic and biotic driving factors. We found that the aboveground biomass of the overstory stratum was larger than that of the understory stratum;the total aboveground biomass of the forest was constrained only by the rock-bareness rate;however, when the forest was divided into different forest strata, we found that only the aboveground biomass of the overstory stratum was constrained by rock-bareness rate, and not the understory stratum. Furthermore, we found that the aboveground biomass of the two forest strata both varied with regards to topography, as shown by the larger overstory stratum at the slope when compared to the hilltop. The opposite trend was observed for the understory stratum;among the biotic factors, only the stem density exhibited positive influences on the aboveground biomass of the overstory and understory strata. These results imply that both abiotic and biotic factors regulate the aboveground biomass of Maolan karst forest, and whole forest level biomass analyses is limited in that the different patterns and drivers of aboveground biomass of different forest strata are overlooked. The findings demonstrate the importance of investigating each forest stratum separately when studying forest biomass patterns and the underlying drivers. In addition, these findings provide intellectual support for the management of Maolan karst forest.

关 键 词：上木层 下木层 地形 岩石裸露率 茂兰国家级自然保护区 

分 类 号：S718.5[农业科学—林学]