[Seasonal dynamics of soil mineral nitrogen pools and nitrogen mineralization rate in different forests in subtropical China].

We conducted an in situ incubation experiment to determine soil mineral N (NH-N and NO-N) concentrations and soil net N mineralization rates (net ammonification rate and net nitrification rate) using close-top PVC tubes in three adjacent forests (natural forest, Castanopsis kawakamii and Cunninghamia lanceolata plantation) from September 2014 to August 2015 in subtropical China, investigating the effects of forest type and season on soil inorganic N concentrations and soil net N mineralization rates. Results showed that soil NO-N was the dominant form in mi-neral N pool in all three forests, and the proportion of NO-N to soil inorganic N content ranged from 55.1% to 87.

[Effects of forest types on soil dissolved organic carbon and nitrogen in surface and deep la-yers in subtropical region, China.].

Forest types have significant effects on the availability and dynamics of soil dissolved organic carbon (DOC) and dissolved organic nitrogen (DON). By now the impacts of forest types on soil DOC and DON were mainly focused on surface soil (0-10 cm). Based on the comparisons between natural forest, Phyllostachys pubescens, Castanopsis kawakamii and Cunninghamia lanceolata plantations, we investigated the effects of forest types on soil DOC and DON pools in top (0-10 cm) and deep soils (40-60 cm).