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- 2015
武功山山地草甸土壤全量氮磷钾分布格局及对不同退化程度的响应
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Abstract:
以武功山核心景区主峰金顶海拔1 600~1 900 m之间的自然未退化草甸土壤与1 850 m不同退化强度草甸斑块土壤2类处理为研究对象，对其A（0~20 cm）、B(20~40 cm)2层土壤全氮、全磷、全钾进行测定，分析武功山草甸土全氮、全磷、全钾的分布格局，及武功山草甸土壤全氮、全磷、全钾含量对草甸不同退化程度的响应。结果表明：1）武功山自然状态下草甸土壤全氮、全磷和全钾含量的变化范围分别为2 094.4～7 473.6 mg？kg-1、0.59~1.73 g？kg-1和18.25~54.25 g？kg-1。在同一垂直土壤剖面中均随着发生层的降低而减少，而全钾含量无此特征，且在A、B 2层中差距较小。2）海拔高度的变化对武功山草甸土壤全氮和全磷含量的影响不显著，但是全钾随着海拔的上升呈显著上升趋势。3）不同草甸退化程度对武功山草甸土壤全磷全钾含量的影响不显著，但对全氮含量的影响达到差异显著水平，武功山退化草甸土壤的磷、钾素养分供应水平无较大缺失，但氮素的供应出现明显损失，可为生态修复中调节土壤肥力提供理论指导。
This study focused on Jinding Mountain, the core scenic peak of Wugong Mountains, two research categories included not degraded meadow soil along the altitudes of 1 600 to 1 900 m, and four degraded meadow soils with different degraded intensities at the altitude of 1 850 m. The contents of the total nitrogen, phosphorus, and potassium in the soil layer of A (0-20 cm) and B (20-40 cm) were measured to analyze the distribution patterns of the three nutrients and the response of the nutrients to different degradation degrees. The results showed that, 1) under the natural state, the ranges of the three nutrients in the meadow soil were 2 094.4-7 473.6 (N), 0.59-1.73 (P), and 18.25-54.25 (K) g？kg-1, respectively. In the same vertical soil profile, the contents of N and P decreased with the depth, whereas, the contents of K in two layer presented little difference. 2) The variation of the altitude demonstrated little impacts on the contents of total N and P, while the content of total K increased significantly with the altitude. 3) Different meadow degradation degrees exhibited little influence on the contents of total P and K, however, significant influences were observed on total N. It was concluded that in the degraded meadow soil of Wugong Mountain, the losses of P and K were not significant; however, the loss of N was obvious. The results of this study would provide theoretical basis for the adjustment of soil nutrients during ecological restoration in this area
