自然肥力，是指在气候、生物、地形、时间等自然因素作用下形成的土壤所具有的供应和协调植物生长发育所需养分的能力。土壤自然肥力是自然成土过程的产物。由于自然成土条件的差别，自然肥力亦有高低之分。
土地自然肥力是自然历史过程的产物；
Natural fertility of soil is the gradual product of natural and historical process.
森林土壤肥力以维持和恢复自然肥力为主，人工施肥为输。
Forest soil fertility mainly relies on maintaining and resuming natural fertility and combines with artificially applying fertilizer.
毛竹纯林随经营期的延长，其土壤的自然肥力呈下降趋势，这是毛竹纯林的生长特性和经营方式决定的。
As the management term of pure bamboo stands prolonged the natural soil fertility declined, which resulted from the growth characteristics of pure bamboo forest and the management methods.
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