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应用生态学报 ›› 2010, Vol. 21 ›› Issue (3): 701-706.

• 研究报告 • 上一篇    下一篇

城市沿江土地覆被变化对土壤有机碳和轻组有机碳的影响

曾宏达;杜紫贤;杨玉盛**;李熙波;张雅纯;杨志峰   

  1. 福建师范大学地理科学学院福建省亚热带资源与环境重点实验室, 福州 350007
  • 出版日期:2010-03-20 发布日期:2010-03-20

Effects of land cover change on soil organic carbon and light fraction organic carbon at river banks of Fuzhou urban area.

ZENG Hong-da|DU Zi-xian|YANG Yu-sheng|LI Xi-bo|ZHANG Ya-chun|YANG Zhi-feng   

  1. Fujian Province Key Laboratory of Subtropical Resources and Environments, College of Geographical Science, Fujian Normal University, Fuzhou 350007, China
  • Online:2010-03-20 Published:2010-03-20

摘要: 采用Vario EL III型元素分析仪,2007年7月分析了福州城市沿江3种土地覆被类型(芦苇湿地以及草坪和片林)土壤有机碳(SOC)与轻组有机碳(LFOC)的垂直分布特征.结果表明:3种土地覆被类型SOC和LFOC含量均表现为在土壤表层富集并向下层递减的趋势,且人工绿地在土壤剖面(0~60 cm)不同层次的SOC和LFOC含量均显著高于沿江芦苇湿地,其中,草坪0~20 cm土层的SOC含量显著高于片林;沿江芦苇湿地转为草坪和片林后,其SOC储量分别增加了94.8%和72.0%,LFOC储量分别增加了225%和93%;城市沿江湿地转变为城市人工绿地后,因植物物种、密度以及周期性人工管理等变化,使土壤质量得以改善、SOC和LFOC储量增加,其中LFOC对土地覆被变化的响应较SOC敏感,以表层(0~20 cm)土壤LFOC受到土地利用/覆地变化的影响最大.

关键词: 沿江湿地, 草坪, 城市片林, 土壤有机碳, 轻组有机碳, 经济发展综合指数, 生态环境质量, 连片特困区, 耦合协调度, 协调类型

Abstract: By using Vario EL III element analyzer, the vertical distribution characteristics of soil organic carbon (SOC) and light-fraction organic carbon (LFOC) in the lawn, patch plantation, and reed wetland at river banks of Fuzhou urban area were studied in July 2007. For all the three land cover types, the SOC and LFOC contents were the highest in surface soil layer, and declined gradually with soil depth. Compared with reed wetland, the lawn and patch plantation had higher SOC and LFOC contents in each layer of the soil profile (0-60 cm), and the lawn had significantly higher contents of SOC and LFOC in 0-20 cm soil layer, compared with the patch plantation. After the reed wetland was converted into lawn and patch plantation, the SOC stock in the soil profile was increased by 94.8% and 72.0%, and the LFOC stock was increased by 225% and 93%, respectively. Due to the changes of plant species, plant density, and management measure, the conversion from natural wetland into human-manipulated green spaces increased the SOC and LFOC stocks in the soil profile, and improved the soil quality. Compared with the SOC, soil LFOC was more sensitive to land use/cover change, especially for those in 0-20 cm soil layer.

Key words: wetland at river bank, lawn, urban patch plantation, soil organic carbon, light fraction organic carbon, eco-environment quality, contiguous special poverty-striken area, economic development composite index, coupling coordination degree, coupling coordination type.