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Soil organic carbon in semi-natural mixed larch-spruce-fir stands of northeastern China.

WANG Hai-yan~1;LEI Xiang-dong~2;ZHANG Hui-ru~2;YANG Ping~1.1 School of Soil and Water Conservation,Key Laboratory of Soil and Water Conservation & Desertification Combating of Ministry of Education,Beijing Forestry University,100083,P.R.China;2 Institute of Resource Information Techniques,Chinese Academy of Forestry,Beijing,100091,P.R.China.  
Forest soil organic carbon(SOC) is an important component of SOC pool.It is of great importance to study the effects of forest management on SOC for mitigating climate changing effects.Semi-natural mixed larch-spruce-fir stands in northeastern China were selected for field experiment to study SOC content in the soil layers of 0--20 cm,20--40 cm,40--60 cm and SOC density.The authors also examined the effects of thinning on SOC and the relationship between SOC and other soil characteristics.The results were showed as the followings:1) the mean SOC content was 51.11 g/kg and SOC density in the whole soil profile(0——60 cm) was 27.20 kg/m~2;2) with the increase of soil depth,SOC content and density decreased significantly,but the decrease varied with thinning intensity;3) there was no significant effects of thinning intensity on SOC content and density.No obvious difference was observed for SOC content and density 20 years after thinning;4) SOC content had significant negative correlations with soil bulk density,but positive correlations with soil water content;5) the correlations between SOC content as well as SOC density and soil pH value,total and available soil N,P and K varied in different soil layers.In the whole soil profile,except for soil pH,the SOC content and density had very significant or significant positive correlations with total and available soil N,P and K.
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