近天然落叶松云冷杉林土壤有机碳研究

森林土壤有机碳是土壤有机碳库的重要组成部分。研究森林经营对土壤有机碳的影响对于应对气候变化下的森林经营有重要意义。该文以东北近天然落叶松云冷杉林地为对象，研究不同层次（0～20 cm、20～40 cm和40～60 cm）的土壤有机碳含量和有机碳密度、间伐的影响及其与其他土壤特性的关系。结果表明:①近天然落叶松云冷杉林土壤有机碳含量平均值为51.11 g/kg，0～60 cm土壤剖面有机碳密度为27.20 kg/m2；②土壤有机碳含量和有机碳密度随土壤深度增加而显著减少，但采伐强度不同其减少程度不同；③间伐强度对土壤有机碳含量和有机碳密度的影响不显著，间伐20年后不同间伐强度间土壤有机碳含量和有机碳密度没有明显的差异；④土壤有机碳含量与土壤密度呈显著或极显著负相关，而与土壤含水量呈显著或极显著正相关；⑤不同土层中，土壤有机碳含量和有机碳密度与土壤pH值和土壤N、P、K全量和有效量的相关性不尽一致。在整个土壤剖面，除土壤pH以外，土壤有机碳含量和有机碳密度与土壤N、P和K的全量和有效量均呈显著或极显著正相关。 

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