| 高春莲,汪珍川,胡宝清,等.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,(5-7):- |
| The spatial variation and distribution characteristics of asymbiotic dinitrogen fixation in Cunninghamia lanceolata, Eucalyptus, Pinus massoniana Plantation Forests--Taking Guangxi Gaofeng Forestry as an example |
| 投稿时间：2024-01-17 修订日期：2024-03-22 |
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| Abstract: |
| Abstract: 【Objective】 To investigate the spatial distribution and content differences of asymbiotic dinitrogen fixation (ANF) in different ecosystem components of Cunninghamia lanceolata, Eucalyptus, Pinus massoniana plantation forests in different growing seasons. 【Methods】 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 the Guangxi Gaofeng Forestry by determining the amount of ANF of the soil, litter and canopy leaves in the growing season and non-growing season. By measuring the amount of ANF in soil, litter and canopy leaves during the growing and non-growing seasons, spatial variation and content differences were investigated. 【Results】In both growing and non-growing seasons, the trends of ANF in each component of plantation forest 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, and the distribution of litter and canopy leaves was high in the northeast and low in the southwest, on the contrary; in the non-growing season, the spatial distributions of soil and canopy leaves were generally similar to those in the growing season, and the litter was true for apoplastic material. Soil ANF was the highest in plantation forests, at 1.2834 kg N/ha-y and 0.5668 kg N/ha-y, and the lowest in canopy leaves, at 0.0009 kg N/ha-y and 0.0028 kg N/ha-y. Soil ANF 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 different seasons of Cunninghamia lanceolata, Eucalyptus, Pinus massoniana plantation forests was significant and strong, and ANF mainly existed in the soil fraction. Therefore, the application of a certain amount of nitrogen fertiliser to the soil during the planting of Cunninghamia lanceolata, Eucalyptus, Pinus massoniana can promote the growth of plantation forests. |
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