Scale-dependent soil macronutrient heterogeneity reveals effects of litterfall in a tropical rainforest
Scale-dependent soil macronutrient heterogeneity reveals effects of litterfall in a tropical rainforest
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DOI：
10.1007/s11104-015-2402-z
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发表时间：
2015-02
期刊：
影响因子：
4.9
通讯作者：
Shang-wen Xia;Jin Chen;D. Schaefer;M. Detto
中科院分区：
文献类型：
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作者：
Shang-wen Xia;Jin Chen;D. Schaefer;M. Detto
目的土壤空间异质性是划分环境生态位和促进物种共存的重要因素，尤其是在热带雨林中。然而，土壤常量营养元素的细尺度空间变异性及其影响因素还不是很清楚。方法对中国热带雨林1公顷样地的土壤进行密集采样，研究土壤酸度和常量营养元素的空间异质性，并利用尺度小波分析探讨地形和凋落物对土壤性质的影响。结果地形在较大尺度上表现出较大的变异(>；土壤pH在大尺度上表现出与地形显著相关的变化，而土壤全氮、氨氮、速效磷和速效钾则表现在较小尺度上的变化，并与凋落物化学通量显著相关。林冠优势树种在高凋落物输入地非随机分布。结论本研究表明土壤常量营养元素的细尺度空间变异性受凋落物化学通量的强烈影响，这凸显了生物因子对于了解热带雨林土壤异质性的细尺度格局的重要性。
AimsSoil spatial heterogeneity is an important factor partitioning environmental niches and facilitating species coexistence, especially in tropical rainforests. However, fine-scale spatial variability of soil macronutrients and its causative factors are not well understood. We investigate this fine-scale variability and how it relates to environmental factors.MethodsWe conducted intensive soil sampling (361 samples) in a 1 ha plot in a tropical rainforest in Southwest China to investigate patterns of spatial heterogeneity in soil acidity and macronutrients and explored how the soil properties were influenced by topography and litterfall using a scale-wise wavelet analysis.ResultsTopography showed great variability at larger scales (>25 m) compared to litterfall properties, which peaked at about 25 m. Soil pH showed variation at large scales and was significantly correlated with topography, whereas soil total nitrogen, ammonium nitrogen, available phosphorus, and potassium showed variation at finer scales and were significantly correlated with litterfall chemical fluxes. A dominant species of canopy tree was non-randomly distributed in high litterfall input sites.ConclusionsThis study shows that fine-scale spatial variability of soil macronutrients is strongly influenced by litterfall chemical fluxes, highlighting the importance of biotic factors for understanding fine-scale patterns of soil heterogeneity in tropical rainforests.