Afforestation Influences Soil Aggregate Stability by Regulating Aggregate Transformation in Karst Rocky Desertification Areas

Surface vegetation has a substantial impact on soil aggregate stability, which is an important indicator of quality. However, there still limited research the response stability indicators and organic carbon, total nitrogen, phosphorus content in aggregates for different patterns rocky desertification fragile ecological areas. Therefore, order to study effects restoration models related nutrient their promoting relationships karst areas southwest China, samples under three artificial measures (Juglans regia L.-Rosa roxburghii Tratt., Rosa Tratt.-Lolium perenne L., Juglans L.-Lolium L.) were collected 0–10 cm 10–20 soil, traditional farmland (Zea mays was used as control, combined with dry wet sieving experiments analysis. The results showed that significant differences distribution nutrients among four types plots. Compared agricultural land, afforestation increased large macroaggregates (LMAs) decreased proportion microaggregates (MIAs) silt+clay (SCA), enhanced reduced fragmentation erodibility. aggregate-related SOC, TN, TP, decrease particle size. Research found are significantly influenced by size aggregates. In positive succession process types, accumulation controlled changes size, affects reduces erodibility, thereby protecting loss. composite management forest irrigation degraded certain reference indicative significance