杉木、桉树、马尾松人工林非共生固氮量空间变异与分布特征—以广西高峰林场为例

高春莲 1; 汪珍川1; 胡宝清 1; 梁清怡 1; 王家妍 2; 李 刚 2; 孙 君 3

文章摘要

高春莲 1 ，汪珍川1 ，胡宝清 1 ，梁清怡 1 ，王家妍 2 ，李刚 2 ，孙君 3.杉木、桉树、马尾松人工林非共生固氮量空间变异与分布特征—以广西高峰林场为例[J].广东农业科学,2024,51(5):102-114

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Spatial Variation and Distribution Characteristics of Asymbiotic Nitrogen Fixation in Cunninghamia lanceolata, Eucalyptus and Pinus massoniana Plantation Forests - Taking Guangxi Gaofeng Forestry as an Example

DOI：10.16768/j.issn.1004-874X.2024.05.009

中文关键词: 非共生固氮量空间分布克里金插值人工林高峰林场

英文关键词: asymbiotic nitrogen fixation spatial distribution kriging interpolation plantation forest Guangxi Gaofeng Forestry

基金项目:广西自然科学基金（2021GXNSFBA075058）；广西科技基地与人才专项项目（桂科 AD20297037）

作者	单位
高春莲 1 ，汪珍川1 ，胡宝清 1 ，梁清怡 1 ，王家妍 2 ，李刚 2 ，孙君 3	1. 南宁师范大学地理与海洋研究院 / 北部湾环境演变与资源利用教育部重点实验室 / 广西地表过程与智能模拟重点实验室，广西南宁 530004；2. 广西国有高峰林场，广西南宁 530000； 3. 河池市林产工业工作站，广西河池 547000

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中文摘要:

【目的】探究不同生长季杉木、桉树、马尾松人工林不同生态系统组分非共生固氮量空间分布变化与含量差异。【方法】利用普通克里金插值分析、方差分析和相关性分析方法，以广西高峰林场杉木、桉树、马尾松混交林为研究对象，通过测定生长季与非生长季土壤、凋落物和冠层叶片非共生固氮量，展开空间变异与含量差异特征研究。【结果】无论生长季还是非生长季，人工林各组分非共生固氮量变化趋势不同且显著，空间相关强烈且异质性强。生长季，土壤非共生固氮量呈现东北低西南高的分布特征，凋落物、冠层叶片与之相反，呈东北高西南低的特征；非生长季，土壤和冠层叶片量空间分布大体上与生长季相似，凋落物则相反。人工林土壤非共生固氮量最高，为 1.2834、0.5668 kg/hm2 ·y，冠层叶片最低，为 0.0009、0.0028 kg/hm2 ·y。土壤非共生固氮量与凋落物、冠层叶片存在显著差异。生长季，土壤非共生固氮量与凋落物呈显著负相关，其他组分间相关性不显著；非生长季，各组分之间非共生固氮量不存在显著相关性。【结论】杉木、桉树、马尾松人工林不同季节各组分非共生固氮量空间分异特征显著且强烈，非共生固氮量主要存在土壤组分中。因此，在杉木、桉树、马尾松种植过程中对土壤施入一定氮肥，可促进人工林生长。

英文摘要:

【Objective】The study was conducted to investigate the spatial distribution and content differences of asymbiotic nitrogen fixation (ANF) in different ecosystem components of Cunninghamia lanceolata, Eucalyptus, Pinus massoniana plantation forests in different growing seasons.【Method】By using ordinary kriging interpolation, analysis of variance and correlation analysis, we conducted a characterisation study of spatial variability and content differences in ANF of Cunninghamia lanceolata, Eucalyptus, Pinus massoniana plantation forests in Guangxi Gaofeng Forestry by determining the amount of ANF in soil, litter and canopy leaves in the growing season and non-growing season.【Result】In both growing and non-growing seasons, the trends of ANF in each component of plantation forests were different and significant, with strong spatial correlation and heterogeneity. In the growing season, the distribution of soil ANF was low in the northeast and high in the southwest, while the distributions of litter and canopy leaves were high in the northeast and low in the southwest; in the nongrowing season, the spatial distributions of soil and canopy leaves were generally similar to those in the growing season, and that of the litter showed the opposite result. Soil ANF was the highest in plantation forests, at 1.2834 and 0.5668 kg/hm2 ·y, and the lowest was in canopy leaves, at 0.0009 and 0.0028 kg/hm2 ·y. ANF in soil differed significantly from that in litter and canopy leaves. In the growing season, the amount of soil ANF was significantly negatively correlated with litter, and the correlation between the other components was not significant; in the non-growing season, the amount of ANF between the components did not have a significant correlation. 【Conclusion】The spatial differentiation of ANF in various components of Cunninghamia lanceolata, Eucalyptus, Pinus massoniana plantation forests in different seasons was significant and strong, and ANF mainly existed in the soil fraction. Therefore, the application of a certain amount of nitrogen fertilizer to the soil during the planting of Cunninghamia lanceolata, Eucalyptus and Pinus massoniana can promote the growth of plantation forests.

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