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东江中下游流域森林土壤氮含量空间分布特征*
张耕1, 孙冬晓1, 康剑2, 谢振东1, 曲仡1, 丁晓纲1
1.广东省林业科学研究院;2.广东省林业科学研究院/中国科学院华南植物园
摘要:
土壤全氮是森林土壤的结构性和养分元素。研究通过对东江中下游流域内 192 个土壤样点 进行分层采样，统计分析全氮含量在各土壤层之间的空间分布状况。结果显示，4 个土壤层（D1~D4， 0~80 cm）全氮含量的平均值分别为 876.28 mg/kg、630.05 mg/kg、563.48 mg/kg 和 518.81 mg/kg；D1~D4 土壤层随土壤深度的增加，全氮含量整体降低，每个土壤层的空间变异性逐渐减小；垂直方向上，除 D3 与 D4 土壤层之间的氮含量无显著差异外，其余各土壤层之间均相互存在显著差异。
关键词:  在显著差异。 关键词土
DOI：
分类号:
基金项目:广东省省级财政专项资金“林地土壤调查”（2020年-2022年），广东省科技计划项目(2019-07)。
Spatial Distribution Characteristics of Forest Soil Nitrogen in Middle and Lower Reaches of Dongjiang River Basin
Zhang Geng1, Sun Dongxiao1, Kang Jian2, Xie Zhendong1, Qu Yi1, Ding Xiaogang1
1.Guangdong Provincial Key Laboratory of Silviculture, Protection and Utilization/ Guangdong Academy of Forestry;2.Guangdong Provincial Key Laboratory of Silviculture, Protection and Utilization/ Guangdong Academy of Forestry, South China Botanical Garden, Chinese Academy of Sciences
Abstract:
Soil total nitrogen is a structural and nutrient element of forest soils. In the study, the spatial distribution of total nitrogen content among different soil layers was statistically analysed by stratified sampling of 192 soil sample points in the middle and lower reaches of the Dongjiang River basin. The results showed that the mean values of total nitrogen content in the four soil layers (D1-D4) were 876.28 mg/kg, 630.05 mg/kg, 563.48 mg/kg and 518.81 mg/kg respectively. With the increase of soil depth, the total nitrogen content of D1-D4 soil layer decreased as a whole, and the spatial variability of each soil layer gradually reduced. There are significant differences between the remaining soil layers except for the D3 and D4 soil layers in the vertical direction.
Key words:   soil layer  soil nitrogen  spatial distribution  middle and lower reaches of Dongjiang River basin