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| biogeochemical cycle Movement of chemical elements in a circular pathway, from organisms to physical environment, back to organisms. The process is termed a nutrient cycle if the elements concerned are trace elements, which are essential to life. A biogeochemical cycle occurs when vegetation decomposes and minerals are incorporated naturally in the humus for future plant growth (化学元素的运动循环，从生物到物理环境，回到生物。如果相关元素是微量元素，这个过程被称为一个养分循环，是生命的基础。一个生物地理化学循环发生在植被分解，矿物为未来植物生长被自然用于腐殖质。) | |||