桂西北喀斯特典型土壤有机碳矿化过程中微生物活性的变化

生态学杂志 ›› 2012, Vol. 31 ›› Issue (08): 2023-2028.

桂西北喀斯特典型土壤有机碳矿化过程中微生物活性的变化

胡乐宁^1,2,3,苏以荣^1,2**,何寻阳^1,2,李杨^1,2,黎蕾^1,2

（¹中国科学院亚热带农业生态研究所亚热带农业生态重点实验室，长沙 410125； ²中国科学院环江喀斯特农业生态试验站，广西环江 547100； ³广西师范大学环境与资源学院，广西桂林 541004）

出版日期:2012-08-10 发布日期:2012-08-10

Changes of soil microbial activity during the mineralization of organic carbon in typical soils in Karst region of Northwest Guangxi, South China.

HU Le-ning^1,2,3, SU Yi-rong^1,2**, HE Xun-yang^1,2, LI Yang^1,2, LI Lei^1,2

(¹Key Laboratory of Subtropical Agriculture Ecology, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China; ² Huanjiang Observation and Research Station for Karst Ecosystems, Huanjiang 547100, Guangxi, China; ³ Department of Resource and Environmental Science, Guangxi Normal University, Guilin 541004, Guangxi, China)

Online:2012-08-10 Published:2012-08-10

摘要/Abstract

摘要： 为了研究喀斯特地区典型土壤有机碳积累与转化过程，采取野外取样分析与室内培养相结合的方法，以红壤为对照，采集2种喀斯特典型土壤（即棕色石灰土和黑色石灰土），设置不添加外源物质（CK）、添加¹⁴C标记的稻草（T1）、添加碳酸钙粉末（T2）和同时添加¹⁴C标记的稻草与碳酸钙粉末（T3）4个处理，进行室内培养试验，以土壤微生物指标（微生物生物量碳、基础呼吸、微生物碳熵和代谢熵）指示土壤有机碳积累与转化过程。结果表明，土壤有机碳矿化过程中，土壤呼吸的累积量依次为黑色石灰土>棕色石灰土>红壤(P<0.05)。微生物碳熵随土壤有机碳矿化变化依次为黑色石灰土>棕色石灰土>红壤(P<0.05)。同时添加外源稻草和钙对提高土壤微生物碳稳定性的效果最强。桂西北喀斯特地区土壤微生物指标的变化因土壤类型不同而存在差异。利用微生物指标来衡量土壤有机碳稳定性较为可靠。

关键词: 链格孢菌, 二孢白粉菌, 短小芽孢杆菌, 拮抗活性

Abstract: In order to understand the accumulation and transformation of organic carbon in typical Karst soils, soil samples were collected from terra fusca and rendzina, and a 100day incubation experiment was conducted to study the accumulation and transformation of soil organic carbon under no exogenous substance addition (CK), ¹⁴Clabeled rice straw addition (T1), calcium carbonate addition (T2), and ¹⁴Clabeled rice straw + calcium carbonate addition (T3), taking soil microbial biomass carbon (MBC), basic respiration (BR), BR/MBC ratio (qCO₂), and MBC/SOC ratio as the indicators and with red soil as the contrast soil. During the mineralization of the organic carbon in test soils, both the BR and the qCO₂ followed the order of rendzina > terra fusca > red soil (P<0.05). Treatment T3 had the greatest effect in enhancing the stability of soil MBC. The changes of the soil microbial indicators differed significantly with test soils, and thus, using these indicators to measure the stability of soil organic carbon would be more credible.

Key words: Alternaria alternata, Erysiphe cichoracearum,  Bacillus pumilus, antagonistic activity.

胡乐宁1,2,3,苏以荣1,2**,何寻阳1,2,李杨1,2,黎蕾1,2. 桂西北喀斯特典型土壤有机碳矿化过程中微生物活性的变化[J]. 生态学杂志, 2012, 31(08): 2023-2028.

HU Le-ning1,2,3, SU Yi-rong1,2**, HE Xun-yang1,2, LI Yang1,2, LI Lei1,2. Changes of soil microbial activity during the mineralization of organic carbon in typical soils in Karst region of Northwest Guangxi, South China.[J]. cje, 2012, 31(08): 2023-2028.