[Micronutrient cycling and its affecting factors in forest ecosystems].

Micronutrient cycling in forest ecosystems is affected by soil conditions, litterfall turnover, throughfall properties, and some important ecological processes such as forest fire. This paper reviewed the related researches, with the focus on the micronutrient cycling in aboveground part of forest ecosystems and relevant affecting factors. In most forest ecosystems, litterfall and throughfall were the important sources ensuring the balanced supply of micronutrients for growth forest, while forest fire, environmental pollution, and fertilization could also play important roles in the micronutrient cycling in some forest ecosystems. Future studies on the micronutrient cycling in forest ecosystems should focus on the mechanisms governing micronutrient release from litterfall, the effects of global change and environmental pollution on the micronutrient cycling processes, and the balanced supply of micronutrients in restoration and reconstruction of degraded ecosystems.