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Impacts of Litter on Soil in the Natural Evergreen Broadleaved Forests after Artificial Regeneration in Southern Sichuan STUDY ON FRACTAL FEATURES OF SOIL AGGREGATE STRUCTURE UNDER NATURAL EVERGREEN BR OADLEAVED FOREST AND ARTIFICIAL REGENERATION IN SOUTHERN SICHUAN PROVINCE Seasonal variation of soil nitrogen pools and microbes under natural evergreen broadleaved forest and its artificial regeneration forests in Southern Sichuan Province, China