DISTRIBUTION CHARACTERISTICS OF SOIL NUTRIENTS AND ITS INFLUENCING FACTORS IN SOUTH CHINA KARST AREAS

The eco-environmental problems in karst areas are important issues restricting its development. Ecological restoration and reconstruction are an important part of the harmonious development of ecology and economy in China's karst areas. On the one hand, soil nutrients can reflect soil fertility, organic matter composition and quality. On the other hand, they have a significant impact on plant growth and are the main factor in the nutrient balance of terrestrial ecosystem. This paper systematically summarizes the distribution characteristics of soil nutrients in karst areas of China (spatio-temporal distribution, differences between karst and non-karst areas). Combined with previous research results, the natural and anthropogenic factors that affect the distribution of soil nutrients in karst areas are further analyzed, and countermeasures are put forward for increasing soil nutrient content in karst areas. Also, future research direction and development trend of soil nutrients in karst areas are prospected, which provides a scientific basis for the restoration of ecological functions and vegetation reconstruction in the karst ecological fragile environment in China.