Yan,E.-R., Wang,X.-H., Huang,J.-J., Li,G.-Y. and Zhou,W.(2008): Decline of soil nitrogen mineralization and nitrification during forest conversion of evergreen broad-leaved forest to plantations in the subtropical area of Eastern China. Biogeochemistry, 89, 239-251.

『東中国の亜熱帯域における常緑広葉樹林のプランテーションへの森林転換の間における土壌窒素鉱化と硝化の減退』

『Abstract
　We examined soil nitrogen (N) mineralization and nitrification rates, and soil and forest floor properties in one native forest: evergreen broad-leaved forest (EBLF), one secondary shrubs (SS), and three adjacent plantation forests: Chinese fir plantation (CFP), bamboo plantation (BP) and waxberry groves (WG) in Tiantong National Forest Park, Eastern China. All forests showed seasonal dynamics of N mineralization and nitrification rates. Soil N mineralization rate was highest in EBLF (1.6±0.3 mg-N kg-1 yr-1) and lowest in CFP(0.4±0.1 mg-N kg-1 yr-1). Soil nitrification rate was also highest in EBLF (0.6±0.1 mg-N kg-1 yr-1), but lowest in SS (0.02±0.01 mg-N kg-1 yr-1). During forest conversion of EBLF to SS, CFP, BP and WG, soil N mineralization rate (10.7％, 73％, 403.3％ and 69.8％, respectively), soil nitrification rate (94.9％, 32.2％, 33.9％ and 39％, respectively), and soil N concentration (50％, 65.4％, 78.9％ and 51.9％, respectively) declined significantly. Annual soil N mineralization was positively correlated with total C and N concentrations of surface soil and total N concentration of forest floor, and negatively correlated with soil bulk density, soil pH and C:N ratio of forest floor across the five forests. annual soil nitrification was positively correlated with total C concentration of surface soil and N concentration of forest floor, and negatively correlated with soil bulk density and forest floor mass. In contrast, annual soil nitrification was not correlated to pH value, total N concentration, C:N ratio of surface soil and total C concentration and C:N ratio of forest floor.

Keywords: Evergreen broad-leaved forest; Forest conversion; Forest floor; Nitrogen mineralization; Nitrogen nitrification; Soil properties』

Introduction
Methods
　Study area and site description
　Experimental design
　Determination of soil properties
　Determination of forest floor properties
　Determination of soil N mineralization and nitrification
　Statistical analyses
Results
　Soil and forest floor properties
　　Soil properties
　　Forest floor properties
　Annual soil N mineralization and nitrification rates
　Effects of forest type and seasonality on soil N mineralization and nitrification
　Correlation of soil N mineralization and nitrification rates with soil and forest floor properties
Discussion
　Interactive effects of forest type and seasonality on soil N mineralization and nitrification
　Effects of soil and forest floor properties on soil N mineralization and nitrification
Conclusion
Acknowledgments
References

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