Abstract: A longterm fertilization experiment was conducted on an aquic brown soil in the lower reaches of Liaohe River plain to study the effects of different land use patterns on soil microbial biomass carbon (MBC). The results showed that in agroecosystem the MBC values decreased in the following order: integrated use of NPK and recycled manure >CK>NPK>bare land. A large numbers of plant residue returned to soil had increased the content of organic carbon and humic substances, resulting in a higher MBC in waste land. The content of MBC, either in woodland or in mowing land, decreased significantly than that of in wasteland. The rate of soil MBC was as follows: NPK+C>woodland>wasteland>mowing land>CK>NPK >bare land.

Key words: Wavelet transform, Zagunao watershed, Runoff time serial, Scale