Abstract: A group of longterm field trials was conducted at the lower reaches of Liaohe Plain to study the effects of different fertilization modes on the rec
ycling rates and current season budgets of trace elements in cropland ecosystems. In the process of feedingcomposting, the recycling rates of trace elements v
aried with the elements. Zn had the lowest recycling rate which still approached to 80%, while Fe, Mn, Zn, and Pb had a recycling rate of>80%, and especially
that of Fe, Mn and Pb was>90%. The recycling rate increased with the increasing amount of feed stuffs and bedding materials. The trace elements input of farml
and from manures was far higher than that from chemical fertilizers, and increased with increasing amount of the manures applied; while the trace elements output by crops was the highest in treatment NPK+M, and the lowest in treatment CK. The input was lower than the output, and the budget in different fertilization tr
eatments followed the order of NPK+M<M<CK<NPK. Therefore, applying chemical fertilizers alone induced the deficit of soil trace elements, while nutrients
recycling would offset the soil trace elements loss by crops, and minimize the deficit.

Key words: Lianhua Mountain of Dongguan City, Butterfly, Diversity index, Evenness index, Dominant index