辽东山地不同森林类型土壤有机碳季节动态及其驱动因子

摘要/Abstract

摘要： 为探讨辽东山地不同森林类型土壤有机碳季节变化特征及其驱动因子，选取落叶松人工林、蒙古栎核桃楸次生林和槭树次生林为对象，测定不同土壤层次的土壤有机碳（SOC）、可溶性有机碳（DOC）和微生物量碳（MBC）含量及其季节动态，分析土壤理化因子、生物量因子和气候因子对不同森林类型土壤SOC、DOC和MBC的影响。结果表明：不同森林类型土壤SOC、DOC、MBC含量均表现出明显的垂直分布特征，即0～10 cm>10～20 cm>20～30 cm，且蒙古栎核桃楸林显著大于落叶松林和槭树林；不同森林类型土壤SOC、DOC、MBC含量均有显著的季节变化，表现为夏季较高，DOC和MBC最高值出现的月份不同步；土壤SOC和MBC与土壤含水率、pH、温度呈正相关，与容重和降水呈负相关；土壤DOC与含水率、pH和降水呈正相关，与容重呈负相关；土壤SOC、DOC、MBC多与乔木干、根和凋落物未分解层生物量呈负相关，与灌草层地下生物量和凋落物半分解层生物量呈正相关；不同森林类型土壤SOC、DOC、MBC与其驱动因子的相关程度不同，说明森林类型与气候变化共同作用使不同森林类型形成了其独特的微环境，影响土壤SOC、DOC和MBC含量及其动态变化；蒙古栎核桃楸次生林土壤SOC、DOC和MBC储量在各土层均显著高于其他森林类型，反映其更有利于养分的累积，是适合辽东山地森林结构调整与土壤恢复的森林构建与改造模式。

关键词: 可塑性响应, 养分觅食, 细根形态, 根袋法, 氮沉降

Abstract: To address the seasonal dynamics of soil organic carbon and its driving factors in different vegetation types in mountainous region of eastern Liaoning, the concentration and dynamics of soil organic carbon (SOC), soil dissolved organic carbon (DOC) and soil microbial biomass carbon (MBC) were examined in different soil layers of Larix gemlinii plantation, Quercus mongolica-Juglans mandshurica secondary forest, and Acer secondary forest. The relationships between SOC, DOC, MBC and biomass, soil physicalchemical and climate factors were also analyzed. Our results showed that the concentrations of SOC, DOC, MBC in different forest types displayed a vertical distribution with decreasing order of 0-10 cm>10-20 cm>20-30 cm. In addition, the concentrations of SOC, DOC and MBC in the Q. mongolica-J. mandshurica forest were higher than those of Larixforests and Acer forests. The concentrations of SOC, DOC and MBC had significant seasonal dynamics, with the highest concentrations in summer. The SOC and MBC had positive correlations with soil water content, pH and soil temperature, and had negative correlations with soil bulk density and precipitation. The concentration of DOC had positive correlations with soil water content, pH and precipitation, and had a negative correlation with soil bulk density. The concentrations of SOC, DOC and MBC had negative correlations with the stem and root biomass of tree and decomposition layer of litter, and had positive correlations with belowground biomass of shrubherb layer and biomass of semidecomposed layer of litter. The relationships between SOC, DOC and MBC and their driving factors were remarkably different among forest types, indicating that the interactive effects of forest type and climate made a unique microenvironment for different forest types, which affected the content and seasonal changes of soil SOC, DOC and MBC. The SOC, DOC and MBC storage in Q. mongolica-J. mandshurica forest were higher than those in other two forest types, indicating that it was beneficial to nutrient accumulation. The Q. mongolica-J. mandshurica forest is a suitable model for the construction and reconstruction of forest structure adjustment and soil restoration in the mountain area of eastern Liaoning.

Key words: fine root morphology, root bag method, plastic response, nutrient foraging, nitrogen deposition

范志平,王琼,李法云. 辽东山地不同森林类型土壤有机碳季节动态及其驱动因子[J]. 生态学杂志.

FAN Zhi-ping, WANG Qiong, LI Fa-yun. Seasonal dynamics of soil organic carbon in different forest types and its driving factors in mountainous region of eastern Liaoning.[J]. cje.

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辽东山地不同森林类型土壤有机碳季节动态及其驱动因子

Seasonal dynamics of soil organic carbon in different forest types and its driving factors in mountainous region of eastern Liaoning.

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