Variations in Soil Physico-Chemical Properties along Slope Position Gradient in Secondary Vegetation of the Hilly Region, Guilin, Southwest China
Variations in Soil Physico-Chemical Properties along Slope Position Gradient in Secondary Vegetation of the Hilly Region, Guilin, Southwest China
复制标题
桂林丘陵区次生植被坡位梯度土壤理化性质变化
DOI：
10.3390/su12041303
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发表时间：
2020-02-02
期刊：
影响因子：
3.9
通讯作者：
Huang, Wanqing
中科院分区：
文献类型：
--
作者：
Liu, Runhong;Pan, Yuanfang;Huang, Wanqing
了解土壤理化性质在坡位梯度上的变化对植被恢复重建至关重要，但坡位对丘陵次生植被土壤理化性质的影响尚不清楚。为了解决这些不确定性，我们研究了桂林丘陵区次生植被土壤理化性质的变化及其沿坡位梯度的关系。结果表明：除土壤含水量、土壤全磷和土壤全钾在坡脚处含量最高外，其余土壤理化性质均在中坡处含量最高，大部分土壤理化性质在上坡或坡脚处含量最低。此外，Pearson相关分析显示，大部分土壤理化性质之间不存在显著相关性，且不同坡位土壤理化性质之间的相关性不一致。主成分分析表明，前4个主成分对总变异的贡献率为84.32%，可解释为土壤全氮、土壤有机质、土壤速效氮、土壤速效钾、土壤含水量和土壤全钾的变化。综上所述，我们的研究结果强烈表明，坡位对大部分土壤的理化性质都有显著的影响，为制定不同坡位的修复策略提供了重要的参考，以促进丘陵地区植被的恢复重建和生态环境的可持续发展。
Understanding the variation of soil physico-chemical properties along slope position gradients is essential for vegetation restoration and reconstruction, but how slope positions impact the soil physico-chemical properties in the secondary vegetation of hilly regions is poorly understood. To address these uncertainties, we examined the changes in soil physico-chemical properties and their relationships along the slope position gradient in secondary vegetation of the hilly region in Guilin, southwest China. The results showed that except for the soil water content, soil total phosphorus and soil total potassium which reached the highest value at the footslope, other soil physico-chemical properties reached the highest content in the middle slope, and most of the soil physico-chemical properties showed the lowest content in the upper slope or footslope. Moreover, Pearson’s correlation analysis revealed that there were no significant correlations between most of the soil physico-chemical properties and that the correlations between soil physico-chemical properties were not consistent across different slope positions. Additionally, the principal component analysis showed that the first 4 principal components together explained 84.32% of the total variation and might be interpreted as the change of soil total nitrogen, soil organic matter, soil available nitrogen, soil available potassium, soil water content and soil total potassium. Overall, our results strongly demonstrated that slope positions showed significant effects on most of the soil physico-chemical properties and would provide an important reference for the formulation of restoration strategies in different slope positions to facilitate vegetation restoration and reconstruction and the sustainable development of the ecological environment in the hilly region.