Dissolved Organic Carbon Dynamics and Controls of Planted Slash Pine Forest Soil in Subtropical Region in Southern China

作     者：楚颖 王绍强 王晶苑 Matthias PEICHL Samereh FALAHATKAR CHU Ying;WANG Shaoqiang;WANG Jingyuan;Matthias PEICHL;Samereh FALAHATAR

作者机构：中国科学院地理科学与资源研究所生态系统观测与模拟重点实验室北京100101 中国计量科学研究院计量管理与战略发展研究所北京100013 中国科学院大学北京100049 瑞典农业大学森林生态与管理系瑞典于默奥市se90183 伊朗Tarbiat Modares大学自然资源系 

出 版 物：《Journal of Resources and Ecology》 (资源与生态学报（英文版）)

年 卷 期：2013年第4卷第2期

页      面：105-114页

核心收录：

学科分类：082803[工学-农业生物环境与能源工程] 08[工学] 0828[工学-农业工程] 09[农学] 0903[农学-农业资源与环境] 

基　　金：supported by the Key Project of CAS Knowledge Innovation (KZCX2-YW-QN301) the National Key Basic Research and Development Program (2010CB833503) the "Strategic Priority Research Program" of the Chinese Academy of Sciences (XDA05050602-1) the National Natural Science Foundation of China (No.31070438) 

主　　题：dissolved organic carbon DOC concentration profile and seasonal variability characteristicsanalysis controlling factors 

摘      要：Soil dissolved organic carbon （DOC） is an active fraction of the soil organic carbon （SOC） pool and links terrestrial and aquatic systems. The degradation of DOC can affect carbon cycling, nutrient dynamics and energy supply to microorganism, and consequently change biogeochemical processes. This study investigated the vertical and seasonal variability of soil DOC concentrations and its controls in a 23-year-old planted slash pine （Pinus elliottii） forest at Qianyanzhou Forest Experimental Station （QFES） in Southern China. Soil solutions were collected at bimonthly intervals at depths of 10, 20 and 30 cm by a mechanical-vacuum extractor from November 2007 to March 2009, and at monthly intervals at depths of 10, 30 and 50cm from April 2009 to October 2010. The DOC concentrations were determined with a total organic carbon （TOC） analyzer. Mean （±standard deviation） DOC concentrations at depths of 10cm, 20cm, 30cm and 50cm were 12.4±4.4, 10.6±6.3, 8.7±2.6, and 8.0±5.9 mg L^-1, respectively. Both seasonal and spring means of DOC concentration showed a decreasing trend with increasing depth, while there was no clear trend for the summer, autumn, or winter seasons. DOC concentrations during spring, summer, autumn and winter ranged from 4.8 to 21.5, 4.9 to 26.2, 5.4 to 17.1, 4.9 to 14.6 mg L-1, respectively, their mean DOC concentrations were 10.2, 10.5, 10.8 and 8.3 mg L 1, respectively. No consistent pattern of seasonal variability of DOC concentrations at different depths was observed. No obvious relationship between organic carbon content of forest litter and DOC concentration was found. There was a positive linear relationship between SOC and DOC concentration （R2=0.19, p〈0.01）, which showed that SOC was one of the main controls of DOC. A positive exponential relationship existed between soil temperature at 5 cm and DOC concentrations at 10 cm depth in slash pine, masson pine （Pinus massoniana） and Chinese fir （Cunninghamia lanceolata） planted forests （R2=0.12, p〈0.01