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对鄱阳湖沙山不同沙化程度下土壤养分进行了分析,结果表明:研究区除土壤全钾(2.03%±0.28%)含量较高外,有机质(0.99%±0.42%)、全氮(0.036%±0.022%)、全磷(0.018%±0.007%)含量均处于较低水平。随沙化强度增加,土壤有机质、全氮、全磷含量呈现降低趋势,且重度、中度及轻度沙化区存在显著差异(P<0.01)。土壤速效养分(氮、磷、钾)随沙化强度变化趋势不明显,均处于十分缺乏的水平。地表植被覆盖低及土壤质地粗是导致沙山养分匮乏的主要原因。养分与水分是鄱阳湖沙山植物生长的限制因子,沙山植被恢复的关键在于所筛选的物种及所构建的群落结构能够保障新生植物能适应养分、水分匮乏的生态条件并迅速扩展其生态位。
The results showed that soil organic matter (0.99% ± 0.42%), total nitrogen (0.036%), total nitrogen ± 0.022%), and the content of total phosphorus (0.018% ± 0.007%) was at a low level. The contents of soil organic matter, total nitrogen and total phosphorus decreased with the increase of desertification intensity, and there were significant differences among severe, moderate and mild desertification areas (P <0.01). Soil available nutrients (nitrogen, phosphorus, potassium) with the trend of desertification intensity is not obvious, are in a very lack of level. Low surface vegetation cover and coarse soil texture are the main reasons leading to the lack of nutrients in the mountainous areas. Nutrients and water are the limiting factors for the growth of sandy plants in Poyang Lake. The key to the restoration of sandy vegetation lies in that the selected species and the constructed community structure can ensure the new plants can adapt to the ecological conditions of nutrients and water scarcity and rapidly expand their niche .