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

生态学杂志

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

辜翔¹,方晰^1,2**,项文化^1,2,李胜蓝¹,孙伟军¹

（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）

出版日期:2013-10-10 发布日期:2013-10-10

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

GU Xiang¹, FANG Xi^1,2**, XIANG Wen-hua^1,2, LI Sheng-lan¹, SUN Wei-jun^1

(¹College of Life Science and Technology, Central South University of Forestry and Technology, Changsha 410004, China; ^2National Engineering Laboratory of South China Forestry Ecology Applicable Technologies, Changsha 410004, China)

Online:2013-10-10 Published:2013-10-10

摘要/Abstract

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。

关键词: Pb稳定同位素, NDVI, 滨海湿地, 优先管理区域, 距离分析

Abstract: 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.

Key words: Pb isotope, priority areas, NDVI, distance analysis, coastal wetlands.

辜翔1,方晰1,2**,项文化1,2,李胜蓝1,孙伟军1. 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[J]. 生态学杂志.

GU Xiang1, FANG Xi1,2**, XIANG Wen-hua1,2, LI Sheng-lan1, SUN Wei-jun1. Soil organic carbon and mineralizable organic carbon in four subtropical forests in hilly region of central Hunan Province, China.[J]. cje.

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