湘中丘陵区4种森林类型土壤有机碳和可矿化有机碳的比较  

Soil organic carbon and mineralizable organic carbon in four subtropical forests in hilly region of central Hunan Province,China

作　　者：辜翔[1] 方晰[1,2] 项文化[1,2] 李胜蓝[1] 孙伟军[1] 

机构地区：[1]中南林业科技大学生命科学与技术学院,长沙410004 [2]南方林业生态应用技术国家工程实验室,长沙410004

出　　处：《生态学杂志》2013年第10期2687-2694,共8页Chinese Journal of Ecology

基　　金：国家科技部公益性行业科研专项(201304317);国家野外科学观测研究站项目(GW2012926);湖南省科技厅项目(2011SK3120)资助

摘　　要：采用短期室内土壤培养法，比较研究了湘中丘陵区4种不同森林类型（杉木人工林、马尾松＋石栎针阔混交林、南酸枣落叶阔叶林、石栎＋青冈常绿阔叶林）土壤有机碳、可矿化有机碳的含量。结果表明，4种森林土壤有机碳含量、可矿化有机碳含量以及可矿化有机碳的分配比例均随土壤深度的增加而下降。同一土层有机碳含量从高至低的排序均表现为：石栎＋青冈常绿阔叶林＞马尾松＋石栎针阔混交林＞南酸枣落叶阔叶林＞杉木人工林，0～30 cm土层，南酸枣落叶阔叶林、马尾松＋石栎针阔混交林、石栎＋青冈常绿阔叶林土壤有机碳含量比杉木人工林分别高出20.8%、29.7%和31.9%。可矿化有机碳含量及其分配比例从高至低的排序均表现为：石栎＋青冈常绿阔叶林＞南酸枣落叶阔叶林＞马尾松＋石栎针阔混交林＞杉木人工林，0～30 cm土层，石栎＋青冈常绿阔叶林、南酸枣落叶阔叶林、马尾松＋石栎针阔混交林可矿化有机碳含量比杉木人工林分别高出51.6%、45.2%和41.0%，可矿化有机碳的分配比例比杉木人工林分别高出35.8%、29.3%和20.0%，4种森林土壤可矿化有机碳与总有机碳、土壤微生物生物量碳、全N、C/N之间均呈极显著相关性。A short-term laboratory incubation was conducted to study the variations of soil organic carbon and mineralizable organic carbon concentrations in four forest stands （Cunninghamia lanceolata plantation, Pinus massoniana ＋ Lithocarpus glaber mixed forest, Choerospondias axillaries deciduous broadleaved forest, and L. glaber ＋ Cyclobalanopsis glauca evergreen broadleaved forest） in a hilly region of central Hunan Province. In the four forest stands, the concentrations of soil organic carbon and mineralizable organic carbon and the proportion of soil mineralizable organic carbon to soil total organic carbon decreased with soil depth. In the same soil layers, the concentration of soil organic carbon ranked in the order of L. glaber ＋ C. glauca evergreen broadleaved forest 〉 P. massoniana ＋ L. glaber mixed forest 〉 C. axillaries deciduous broadleaved forest 〉 C. lanceolata plantation. In 0-30 cm soil layer, the organic carbon concentration in the secondary forests was 20.8%-31.9% higher than that in C. lanceolata plantation. The concentration and the proportion of soil mineralizable organic carbon were in the order of L. glaber ＋ C. glauca evergreen broadleaved forest 〉 C. axillaries deciduous broadleaved forest 〉 P. massoniana ＋ L. glaber mixed forest 〉 C. lanceolata plantation. The soil mineralizable organic carbon concentration in L. glaber ＋ C. glauca evergreen broadleaved forest, C. axillaries deciduous broadleaved forest, and P. massoniana ＋ L. glaber mixed forest was 51.6%, 45.2%, and 41.0% higher than that in C. lanceolata plantation, and the proportion of mineralizable organic carbon in 0-30 cm soil layer in the former three secondary forests was 35.8%, 29.3%, and 20.0% higher than that in C. lanceolata plantation, respectively. In the four forest stands, soil mineralizable organic carbon had significant correlations with soil total organic carbon, microbial biomass carbon, total nitrogen, and the ratio of total organic carbon to total nitrogen.

关 键 词：湘中丘陵区 不同演替阶段树种 土壤有机碳 可矿化有机碳 次生林 杉木人工林 

分 类 号：S714[农业科学—林学]