【摘要】 基于重铬酸钾氧化—外加热法,分析福州市区3种土地覆被类型(黄花槐片林、番石榴片林和草坪)SOC的垂直分布特征。结果表明,3种土地覆被类型中,草坪SOC含量最大,番石榴片林和黄花槐片林SOC含量相当;草坪SOC储量最大,其次是黄花槐片林,番石榴片林最小;同一覆被类型SOC含量随土层深度增加而减小;草坪、黄花槐片林与番石榴片林0～10cm土层的SOC含量分别占0～40cmSOC含量的60.9%、51.5%和49.3%,其中草坪0～10cm土层的SOC含量最高,达(27.17±0.48)g/kg,分别比黄花槐片林与番石榴片林高出43.1%和44.9%。一方面,这是由于草坪根系多而浅,地表凋落物输入也集中在表层;另一方面,受人为管理的影响,片林地表凋落物的输入大大减少。更多还原

【Abstract】 Based on the potassium dichromate oxidation-external heating method,three land cover types(Surattensis woodlots,Guava woodlots and Zoysia matrella lawn) of soil organic carbon(SOC) of the vertical distribution in Fuzhou were analyzed.The results showed that,among three types of land cover,SOC content of the lawn was the largest,while SOC contents of Surattensis woodlots and Guava woodlots were relatively lower and quite similar between each other.The lawn had the largest SOC stock,followed by Surattensis woodlots,Guava woodlots was the smallest.SOC content decreased with soil depth in all cover types.The proportions of top soil(0-10 cm) SOC content accounted for 60.9%,51.5% and 49.3% of 0-40 cm SOC content in the lawn,Surattensis woodlots and Guava woodlots,respectively.The 0-10 cm SOC content of lawn was the highest,reaching(27.17 ± 0.48) g/kg,which was 44.9% and 43.1% higher than Surattensis woodlots and Guava woodlots,respectively.The main reason of the high SOC content in lawn ecosystem was that the lawn had a shallower root system than the forests.What’s more,the human management,removing the litter out of forest land,was likely resulted in this phenomenon.更多还原