城市不同森林土壤溶解性有机碳和微生物生物量碳特征

摘要/Abstract

摘要： 土壤溶解性有机碳（DOC）和微生物生物量碳（MBC）在生态系统碳循环中发挥重要作用。为了解城市森林土壤DOC含量和MBC特征及影响因素，本研究以合肥市城市森林为对象，分析不同植被类型（水杉、香樟、雪松）土壤DOC、MBC年动态特征及影响因素。结果表明：植被类型对土壤DOC含量影响显著（P<0.05），0~30 cm土壤DOC含量年均值为水杉林（80.35 mg·kg^-1）>雪松林（60.13 mg·kg^-1）>香樟林（43.36 mg·kg^-1），且总体上随土层深度的增加而递减；水杉林、雪松林土壤DOC含量夏秋季高于冬季，而香樟林则6月含量最低；0~30 cm土壤MBC年均值大小依次为水杉林（412.84 mg·kg^-1）>雪松林（358.85 mg·kg^-1）>香樟林（283.40 mg·kg^-1）；不同植被类型土壤MBC总体上随土层深度增加而递减，且夏、秋季较高，冬季较低。相关分析表明：水杉林、香樟林土壤DOC、MBC与有机碳显著正相关（P<0.01），而雪松林土壤DOC、MBC与根量呈显著正相关（P<0.01），表明雪松林根系分泌及分解转化是其土壤活性碳的重要来源。

关键词: 生理特性, 春季干旱胁迫, 根叶关系, 抗旱性

Abstract: Soil dissolved organic carbon (DOC) and microbial biomass carbon (MBC) play an important role in ecosystem carbon cycle. In order to better understand the characteristics of soil DOC contents and MBC and their controlling factors in urban forest, three forest types including Metasequoia glyptostroboides, Cinnamomum camphora, and Cedrus deodara were selected in Hefei City. The results showed that soil DOC contents were significantly influenced by forest type (P<0.05). The annual averages of soil DOC contents at the depth of 0-30 cm in M. glyptostroboides, C. deodara and C. camphora forests were 80.35, 60.13, and 43.36 mg·kg-1 respectively, and decreased with the increase of soil depth in general. The DOC contents in M. glyptostroboides and C. deodara forest soils were higher in summer and autumn than in winter, while a minimum DOC value was observed in C. camphora forest soil in June. The annual average values of MBC at the depth of 0-30 cm were in the order of M. glyptostroboides (412.84 mg·kg^-1) > C. deodara (358.85 mg·kg^-1) > C. camphora (283.40 mg·kg^-1). The soil MBC was significantly influenced by soil layer (P < 0.05), and generally decreased as the soil depth increased. The MBC values of different forest types were higher in summer and autumn than in winter. The correlation analysis showed that DOC contents and MBC were significantly positively correlated with the contents of soil organic carbon in M. glyptostroboides and C. camphora forests (P<0.01), while significantly positively correlated with root biomass in C. deodara forest (P<0.01), which suggested that exudates and decomposition of roots might be important sources of soil carbon for C. deodara forest.

Key words: drought resistance, relationship between root and leaf, spring drought stress, physiological characteristics.

陶晓,樊伟,杨春,王泽夫,徐小牛*. 城市不同森林土壤溶解性有机碳和微生物生物量碳特征[J]. 生态学杂志.

TAO Xiao, FAN Wei, YANG Chun, WANG Ze-fu, XU Xiao-niu*. Characteristics of soil dissolved organic carbon and microbial biomass carbon in different urban forest communities.[J]. cje.

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城市不同森林土壤溶解性有机碳和微生物生物量碳特征

Characteristics of soil dissolved organic carbon and microbial biomass carbon in different urban forest communities.

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