鹅凰嶂山地雨林土壤阳离子交换量和交换性盐基离子分布特征  

Distribution of Soil Cation Exchange Capacity and Exchangeable Based Cations in the E’huangzhang Montane Rain Forest

作　　者：于耀泓 刘悦 王艺颖 周庆 龙凤玲 赵倩 何茜 莫其锋 YU Yao-hong;LIU Yue;WANG Yi-ying;ZHOU Qing;LONG Feng-ling;ZHAO Qian;HE Qian;MO Qi-feng(Guangdong Key Laboratory for Innovative Development and Utilization of Forest Plant Germplasm,College of Forestry and Landscape Architecture,South China Agricultural University,Guangzhou 510642,China;CFERN Guangdong E’huangzhang National Field Observation and Research Station,Yangjiang 529631,China)

机构地区：[1]华南农业大学林学与风景园林学院,广东省森林植物种质创新与利用重点实验室,广东广州510642 [2]CFERN广东鹅凰嶂国家级野外科学观测研究站,广东阳江529631

出　　处：《土壤通报》2022年第6期1341-1349,共9页Chinese Journal of Soil Science

基　　金：广东林业生态监测网络平台建设项目(2021CG530,2020-KYXM-09)资助。

摘　　要：【目的】探究广东阳春鹅凰嶂山地雨林土壤阳离子交换量和交换性盐基离子的空间分布特征,了解该区域森林土壤的保肥能力及其影响因子。【方法】以鹅凰嶂山地雨林内不同位置、不同土层土壤作为研究对象,分析土壤阳离子交换量和交换性盐基离子空间分布格局、剖面垂直分布规律。【结果】鹅凰嶂山地雨林土壤阳离子交换量5.46±0.97cmol(+)kg^(-1),交换性阳离子呈现明显表聚现象;土壤交换性盐基总量在表层土(0~10 cm)中呈现阴坡>阳坡、下坡位>中坡位>上坡位的规律,土壤盐基离子含量基本呈现K+>Mg^(2+)>Ca^(2+)>Na^(+)的趋势,且Ca^(2+)/Mg^(2+)<1.6;土壤阳离子交换量、交换性盐基总量与土壤总有机碳含量呈极显著正相关。【结论】鹅凰嶂山地雨林土壤的保肥能力较差,且存在生理性缺钙的风险,阳坡尤为明显;同时存在土壤有机质稳定性不高导致阳离子交换量下降的潜在风险。[Objective] This study aims to explore the spatial characteristics of soil exchange cation capacity(CEC)and exchangeable base cations, and understand the soil nutrient retention capacity and the influencing factors in the E’huangzhang montane rain forest. [Method] The soils under different positions and different layers in the montane rain forest of E’ huangzhang were sampled. The spatial distribution pattern and vertical distribution of soil CEC and exchangeable base cations were analyzed. [Result] The average CEC content was only 5.46 ± 0.97 cmol(+) kg^(-1). The soil total exchangeable base(TEB) in surface soil(0-10 cm) showed the ranking of shady slope > sunny slope,downslope > middle slope > upslope. The content of soil exchangeable based cations showed a trend of K + > Mg^(2+)>Ca^(2+)> Na^(+), and Ca^(2+)/Mg^(2+)< 1.6, and the soil CEC and TEB were significantly positively correlated with soil TOC.[Conclusion] The results suggests that there is a risk of physiological calcium deficiency in E’huangzhang montane rain forest soil, especially in sunny slope, and there exists the risk of instability of soil organic matter causing the decreasing soil CEC in this area.

关 键 词：鹅凰嶂 山地雨林 阳离子交换量 土壤肥力 

分 类 号：S714.8[农业科学—林学]