栓皮栎林与油松林土壤有机碳及其组分的研究

土壤有机碳在可持续森林生产力的维持中起重要作用。本文以北京鹫峰地区栓皮栎林和油松林为研究对象,对土壤有机碳及其组分的含量与密度进行了研究。结果表明,在0~20 cm土层中,栓皮栎林土壤总有机碳、轻组有机碳和易氧化碳的含量分别达到14.05 g kg-1、2.97 g kg-1和0.38 g kg-1,显著高于油松林。栓皮栎林0~20 cm土层内土壤颗粒有机碳、轻组有机碳和易氧化碳密度分别较油松林高39.68%、77.77%、145.45%,两植被类型间的的差异均达到了显著水平。在土壤总有机碳中,颗粒有机碳、轻组有机碳和易氧化碳的分配比例分别为23.60%~41.40%、9.10%~33.33%和1.39%~2.80%。因此,栓皮栎林较油松林更有利于土壤总有机碳和活性有机碳的积累。

Soil Total Organic Carbon and Soil Labile Organic Carbon Fraction under Quercus variabilis & Pinus tabulaeformis Forest

Soil organic carbon plays a vital role for maintaining the sustainable forest productivity.The concentration and density of the soil total organic carbon(STOC) and soil labile organic carbon(SLOC) fraction under Quercus variabilis & Pinus tabulaeformis forest were studied in Jiufeng,Beijing.The results showed that the concentration of the STOC,LFOC and readily oxidizable carbon(ROC) at 0 ~ 20 cm soil depth under Quercus variabilis forest were 14.05 g kg-1,2.97 g kg-1 and 0.38 g kg-1,respectively.These were obviously higher than under Pinus tabulaeformis forest.The density of particulate organic carbon(POC),LFOC and ROC at 0 ~ 20 cm soil depth under Quercus variabilis forest were 39.68%,77.77% and 145.45% respectively higher than those under Pinus tabulaeformis Carr forest.The ratios of POC to STOC,LFOC to STOC and ROC to STOC ranged from 23.60% to 41.40%,from 9.10% to 33.33% and from 1.39% to 2.80%,respectively.So the Quercus variabilis forest was suggested to be advantage of the accumulation of STOC and SLOC.