Soil Fertility Indices of Citrus Orchard Land Along Topographic Gradients in the Three Gorges Area of China

摘要: In the Three Gorges Area of China, soil erosion and resultant non-point source pollution ecological degradation have endangered agricultural ecosystems fresh water reservoirs. Although efforts been undertaken to reduce losses from slope land used for citrus production, information on effects management practices fertility indices is either limited or nonexistent. This study was conducted compare 10 years various practices, intercropped with white clover (WC), mulched straw (SM), contour hedgerows (CH), orchard impermeable membrane (IM), wheat (Triticum aestivum) peanut (Arachris hypogaea) (WP), as treatments that conventional (CM). Results showed organic carbon, total available nitrogen, potassium, water-stable aggregate (> 0.25 mm) contents at 0–5 cm depth were higher WC SM than CM treatment. There also spatial variation in along slopes treatments. The phosphorus, both 5–20 depths CH IM average nitrogen potassium WP treatment treatment, but had little effect contents. These suggested intercropping mulching most effective approaches improve area.