Base cation concentrations in forest litter and topsoil have different responses to climate and tree species along elevational gradients
Base cation concentrations in forest litter and topsoil have different responses to climate and tree species along elevational gradients
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森林凋落物和表土中的碱基阳离子浓度对沿海拔梯度的气候和树种有不同的响应
DOI：
10.1007/s11629-018-5129-5
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发表时间：
2019-01
影响因子：
2.5
通讯作者：
Jing-jing Shi
中科院分区：
文献类型：
--
作者：
Feng Xue;Guo-yi Wang;Yu-hang Wang;Ming-fei Zhao;Mu-yi Kang;Kai-xiong Xing;Chen Chen;Yuan Jiang;Jing-jing Shi
森林枯落物是森林中重要的养分库，为表土提供了大量可吸收的盐基阳离子，促进了枯落物-土壤系统中植物的生长。为研究森林凋落物和表土中盐基阳离子浓度的垂直分布特征，探讨气候和树种对土壤盐基阳离子浓度的影响，在海拔2000 m以上（1243~3316 m a.s.l.）并在实验室内分析了BC的浓度。结果表明：1）凋落物Ca含量沿海拔梯度呈沿着驼峰状分布，K、Mg含量沿海拔梯度呈马鞍状分布。土壤Ca含量随海拔升高而增加，而K、Mg含量变化不显著。2)结果表明，不同树种凋落物中Ca含量差异不显著，白杨（Populus davidiana）凋落物中Ca含量显著高于其它树种，而落叶松和冷杉（Larix chinensis和Abies fargesii）凋落物中Ca含量高于其它树种。凋落物中K和Mg含量在针叶林落叶松和冷杉林下较高，而在表土中K和Mg含量在树种间差异不显著。3)年平均气温、生长季降水量和非生长季降水量等气候因子决定了森林枯落物和表土中BC的含量。土壤C/N和C/P也影响枯落物-土壤间碳循环。对不同树种的沿着观测表明，地上树种可以重新分配地下阳离子，这一过程受到气候的深刻影响。枯落物和土壤Ca、K、Mg对环境变量的响应不同，取决于它们的溶解能力和移动的能力。
The forest litter is an essential reservoir of nutrients in forests, supplying a large part of absorbable base cations (BC) to topsoil, and facilitating plant growth within litter-soil system. To characterize elevational patterns of base cation concentrations in the forest litter and topsoil, and explore the effects of climate and tree species, we measured microclimate and collected the forest litter and topsoil (0-10 cm) samples across an elevational range of more than 2000 m (1243 ~ 3316 m a.s.l.), and analyzed the concentrations of BC in laboratory. Results showed that: 1) litter Ca concentration displayed a hump-shaped pattern along the elevational gradients, but litter K and Mg showed saddle-shaped patterns. Soil Ca concentration increased with elevation, while soil K and Mg had no significant changes. 2) Ca concentration in the forest litter under aspen (Populus davidiana) was significantly higher than that in all other species, but in topsoil, Ca concentration was higher under coniferous larch and fir (Larix chinensisandAbies fargesii). Litter K and Mg concentrations was higher under coniferous larch and fir, whereas there were no significant differences among tree species in the concentrations of K and Mg in topsoil. 3) Climatic factors including mean annual temperature (MAT), growing season precipitation (GSP) and non-growing season precipitation (NGSP) determined BC concentrations in the forest litter and topsoil. Soil C/N and C/P also influenced BC cycling between litter and soil. Observation along elevations within different tree species implies that above-ground tree species can redistribute below-ground cations, and this process is profoundly impacted by climate. Litter and soil Ca, K and Mg with different responses to environmental variables depend on their soluble capacity and mobile ability.
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影响因子：
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