栓皮栎林与油松林土壤有机碳及其组分的研究

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

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 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.