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为了探讨石漠化过程对土壤养分的影响,了解粤北岩溶山区石漠化过程中土壤养分的变化规律,选择岩背镇和江英镇为调查区,按照石漠化的不同程度设置样地,系统调查了轻度、中度、重度和极重度石漠化土地表层(0～20cm)土壤养分的变化。结果表明,石漠化过程与土壤养分状况有密切关系,随着土地石漠化的发展,土壤有机质、全N以及速效N、速效P、速效K含量呈现出显著下降趋势(P<0.05),土壤逐步贫瘠化。土壤养分含量的减少与石漠化过程形成正反馈关系,并具有退化方向的一致性和退化过程的同步性等特点。
In order to explore the impact of rocky desertification process on soil nutrients, to understand the variation of soil nutrients during the process of rocky desertification in the karst mountainous areas of northern Guangdong, Yanbei and Jiangying towns were selected as the investigation area, and the sampling plots were set according to different degrees of rocky desertification The changes of soil nutrients in the surface layer (0 ~ 20cm) of mild, moderate, severe and extremely severe rocky desertification areas were systematically investigated. The results showed that the process of rocky desertification was closely related to soil nutrient status. With the development of rocky desertification, the content of soil organic matter, total N and available N, available P and available K showed a significant decrease (P <0.05) Soil gradually impoverished. The decrease of soil nutrient content forms a positive feedback relationship with the process of rocky desertification and has the characteristics of consistency of degradation directions and synchronization of degradation processes.