The Characteristics Comparison of Soil Active Organic Carbon and Nitrogen of 4 Kinds of Vegetation Types in Yaoluoping

doi:10.11924/j.issn.1000-6850.2013-2620

Abstract

Abstract: In order to explore the difference characteristics of soil active organic carbon and nitrogen in different vegetation types, the author systematically analyzed the different vegetation types in the level of soil active organic carbon and nitrogen. This field study was conducted at Yaoluoping Nature Reserve, Anhui Province. In order to determine the concentrations of soil microbial biomass carbon (MBC), microbial biomass nitrogen (MBN), dissolved organic carbon (DOC), and dissolved organic nitrogen (DON) under 4 different vegetations, including evergreen broad-leaved forest (EBF), evergreen broad-leaved and deciduous broad-leaved mixed forests (EDBF), deciduous broad-leaved forests (DBF) and evergreen coniferous forests (ECF). The results showed that hot water extracted 1.5-2.8 times more soil DOC and DON than 2 mol/L KCl. The pool sizes of DOC and DON were measured by hot water and 2 mol/L KCl extraction were in the order of DBF>EDBF>EBF>ECF under 4 different vegetations；The amounts of DON in 2 mol/L KCl extracts were not significantly correlated with those in hot water extracts. The DON in hot water extracts was significantly related to potential mineralizable N (PMN) (r =0.85, P＜0.05), while there was no such relationship present between the PMN and the DOC in KCl extract. This indicated that the DON in hot water extracts might better indicator of soil active organic N pool. Soil MBC and MBN concentrations were 136.45-297.23 mg/kg, and 16.33-37.11 mg/kg, respectively. 4 forests in soil MBC and MBN were characterized by DBF>EBF>EDBF>ECF. There were significant positive correlations between MBC, MBN and DOC, DON, indicating the close relationships between MBC, MBN and DOC, DON and the main reason of this distinction was the diverse source in active organic carbon and nitrogen under different vegetation.

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