| 摘要: |
| 【 目的】了解不同分布区极小种群猪血木（Euryodendron excelsum）生境土壤养分特征，探讨土壤养分 状况对猪血木胸径的影响，为猪血木种群的保护与可持续经营提供科学依据。【 方法】以天然分布区（广东阳春市八 甲镇（BJ）、三甲镇（SJ））与栽培分布区（阳春市林业科学研究所（LKS）、鹅凰嶂省级自然保护区（EHZ））的猪血木种群 为研究对象，测定4个分布区0~50 cm土层土壤养分含量，采用主成分分析和相关性分析，筛选出独立性较强的高载 荷指标进入土壤养分评价的最小数据集，采用隶属度函数对所有指标进行标准化处理并计算土壤质量指数，同时运用 广义线性混合模型（generalized linear mixed model，GLMM）分析土壤质量指数、受干扰程度、坡度、海拔、坡位等因子 对不同分布区猪血木胸径的影响。【 结果】各分布区猪血木土壤 pH 值差异较小，但土壤有机质、全氮、全磷、全钾、碱 解氮、有效磷、速效钾、有效铁、有效铜、交换性锰含量差异达极显著水平。从13个指标中，筛选出pH、全氮、全钾、碱 解氮、有效磷、有效铜、交换性锰7个指标构成土壤养分评价的最小数据集。基于最小数据集得到的猪血木各分布区 土壤质量指数均值由大到小的顺序为EHZ（0.37）=LKS（0.37）P>0. 05）。评价结果表明，猪血木生境土壤养分状况总体偏差，土壤全磷、有效硼、交换性锰等含量较低，其中栽 培分布区土壤有机质、全氮处于中等偏下水平，氮素可利用性较差。相比于受干扰程度、坡度、海拔、坡位等环境因子， 土壤质量指数是影响现阶段猪血木胸径分布的最关键因子。【 结论】极小种群猪血木的生长与分布存在土壤养分 限制。 |
| 关键词: 猪血木 极小种群 土壤养分 速效养分 微量元素 土壤质量指数 |
| DOI：10.13207/j.jnwafu.2026.04.006 |
| 分类号: |
| 基金项目:广州市科技局社会发展项目（202206010058）；广东省林业局猪血木极小种群资源拯救项目（粤林函［2022］250 号）；广 东省林木种质资源调查项目（GDZZDC20228702）；中国林科院基本科研业务费专项资金项目（CAFYBB2024QF001） |
|
| Soil nutrient properties and evaluation in distribution areas of extremely small population plant Euryodendron excelsum Hung T. Chang |
|
YUAN Zaixiang1, YU Niu1, DONG Mingliang1, WU Weihuang11, QIU Zuxie2, SU Yu3, YANG Jinchang1
|
|
1.Research Institute of Tropical Forestry，Chinese Academy of Forestry，Guangzhou，Guangdong 510520，China;2.Yangchun Forestry Science Research Institute，Yangchun，Guangdong 529699，China;3.Guangzhou Collaborative Innovation Center on Science-Tech of Ecology and Landscape，Guangzhou，Guangdong 510405，China
|
| Abstract: |
| 【 Objective】The study aimed to investigate the soil nutrient properties in different distribution areas of the extremely small population plant Euryodendron excelsum Hung T. Chang and explore the effect of
soil nutrient properties on the DBH of E. excelsum，to provide scientific basis for its protection and sustainable management.【Method】The E. excelsum populations from natural distribution area（Bajia town（ BJ），Sanjia
town（SJ）） and cultivation distribution area（Yangchun Forestry Science Research Institute（LKS），E’huangzhang Provincial Nature Reserve（EHZ））were taken as the research object. The nutrients content of these soil
samples at the depth of 0?50 cm collected from 4 distribution areas were determined. The independent chemical index with higher load value was selected and included in the minimum data set for soil fertility evaluation by
principal component analysis and Pearson correlation analysis. All indices were normalized by membership functions and then used to calculate the soil quality indexes（ SQI）. The effects of SQI，jamming intensity，slope，altitude and slope position on the DBH of E. excelsum were evaluated by the generalized linear mixed model （GLMM）.【Result】No significant difference was observed in pH among different distribution areas of E.excelsum. However，significant difference was observed in organic matter，total nitrogen，total potassium，alkali-hydrolyzed nitrogen，available phosphorus，available potassium，available iron，available copper and exchangeable manganese among different distribution areas of E. excelsum. 7 chemical indexes（ i. e. ，pH，total nitrogen，total potassium，alkali-hydrolyzed nitrogen，available phosphorus，available copper and exchangeable manganese） was selected from total data set composed of 13 chemical indexes，to form the minimum data set. The order of SQIs calculated by minimum data set among different distribution areas of E. excelsum was as follows：EHZ（0. 37）=LKS（0. 37）E. excelsum was poor. The contents of total phosphorus，available boron and exchangeable manganese in the soil were low. Moreover，the contents of soil organic matter，total nitrogen and alkalihydrolyzed nitrogen in cultivation distribution area of E. excelsum were relatively low，which were lower than those of natural distribution area. Compared to jamming intensity，slope，altitude and slope position，the SQI based on the minimum data set was the key factors influencing the DBH distribution of E. excelsum population at this stage.【Conclusion】The growth and spatial distribution of extremely small population plant E. excelsum
were limited by soil nutrient status. |
| Key words: Euryodendron excelsum extremely small population soil nutrition available nutrition trace element soil quality index |
