瓦屋山扁刺栲-中华木荷常绿阔叶次生林土壤有机碳组分特征  

Characteristics of soil organic carbon components in a secondary Castanopsis platyacantha-Schima sinensis evergreen broad-leaved forest,Wawushan Mountain

作　　者：陈刚[1] 涂利华[1] 彭勇[1] 胡红玲[1] 胡庭兴[1] 

机构地区：[1]四川农业大学林学院,雅安625014

出　　处：《生态学报》2015年第18期6100-6109,共10页Acta Ecologica Sinica

基　　金：国家自然科学基金项目(31300522);教育部高等学校博士学科点专项科研基金项目(20125103120018);四川省教育厅重点项目(12ZA118;13ZA0246)

摘　　要：次生林在全球碳循环中占有重要地位,为了研究中国中亚热带次生林土壤有机碳组分特征,以四川瓦屋山中山段扁刺栲-中华木荷常绿阔叶次生林为对象,通过挖取土壤剖面分层(0—10、10—40、40—70 cm和70—100 cm)取样方式,研究土壤各有机碳组分特征。结果表明:土壤有机碳、微生物生物量碳、可浸提溶解性有机碳和易氧化碳含量均随土层深度增加而减小,0—10 cm土层有机碳含量为121.89 g/kg,高于已报道的亚热带其他常绿阔叶林和四川各类森林;0—10 cm层微生物生物量碳含量为1931.82 mg/kg,可浸提溶解性有机碳含量为697.42 mg/kg,易氧化碳含量为20.98 g/kg,高于已报道的许多相似天然林和人工林活性碳含量。土壤有机碳储量为154.87 t/hm2,在四川省各类森林中处于中等水平。研究表明瓦屋山扁刺栲-中华木荷常绿阔叶次生林活性碳含量较大,微生物活动和养分流动较为活跃,凋落物层转化为土壤碳的潜力较大,这类生态系统可能会在区域碳循环过程中扮演更为重要的角色。Secondary forests are one of the most important fast-growth forest types, with a large distribution area and high potential carbon sequestration capacity. In order to investigate the component characteristics of soil organic carbon in a subtropical secondary evergreen broad-leaved forest, an experiment was conducted in a typical evergreen broad-leaved secondary forest （ Castanopsis platyacantha-Schima sinensis ） in the middle section of Wawushan Mountain, southwest China. The physical soil properties and soil carbon fractions were studied, with the soil profile divided （0--10, 10--40, 40--70 cm and 70--100 cm） and sampled. Results showed that the soil at each level was acidic. Soil potential acidity was between 3.2 and 4.0, field moisture capacity was 63%--190%, and total porosity and bulk density were 63.0%--83.3% and 0.41--0.99 g/cm~ respectively. Soil pH value and bulk density increased with increased soil depth, while the field moisture capacity and total porosity showed the opposite trend. The organic carbon content of litter was 443 g/kg, and the litter stock and litter carbon stock were 10.4 lfhm2and 4.5 t./hm2, respectively. Litter organic C stock in the studied forest was higher than in the majority of the plantations and natural forests in Siehuan Province. Soil organic carbon, microbial biomass carbon, extractable dissolved organic carbon, and readily oxidizable carbon decreased with an increase in soil depth. The soil organic carbon content in the 0--10 cm layer was 121.9 g/kg, which was higher than reported in other subtropical evergreen broad-leaved forests and in all types of forests in Sichuan （3.6, 8.6, and 14.6 times the soil organic content of the soil layers at 10--40 cm, 40--70 cm, and 70--100 cm respectively）. The content of microbial biomass carbon in the 0--10 cm layer was 1931.82 mg/kg, which was 2.6, 5.7, and 7.8 times that in the following three layers. The contents of extractable dissolved organic carbon and readily oxidizable carbon in the 0--10 cm layer were 697.42 mg/kg

关 键 词：次生林 土壤有机碳 亚热带 瓦屋山 

分 类 号：S714.2[农业科学—林学]