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土地利用变化对漳江口红树林土壤有机碳组分的影响

陈志杰1,2,韩士杰1,张军辉1*#br#   

  1. (1中国科学院沈阳应用生态研究所森林生态与管理重点实验室, 沈阳 110016; 2中国科学院大学, 北京 100049)
  • 出版日期:2016-09-10 发布日期:2016-09-10

Effects of land use change on soil organic carbon fractions in mangrove wetland of Zhangjiangkou. 

CHEN Zhi-jie1,2, HAN Shi-jie1, ZHANG Jun-hui1*#br#   

  1. (1Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Chinese Academy of Science, Shenyang 110016, China; 2University of Chinese Academy of Science, Beijing 100049, China).
  • Online:2016-09-10 Published:2016-09-10

摘要: 土地利用变化对土壤有机碳(SOC)的影响是全球碳循环研究的重要内容。本研究在福建漳江口红树林保护区采集红树林湿地、旱地(红树林湿地转变而来)和水田(长期种植水稻) 3种土壤,测定土壤有机碳及其组分的含量变化。结果表明:红树林土壤总有机碳含量分别高于旱地土壤29.50%和水田土壤19.56%,而水田土壤有机碳含量高于旱地土壤。在湿地转变为旱地后,可溶性有机碳(DOC)、微生物生物量碳(MBC)和矿质结合有机碳(MOC)分别增加了40.39%、248.43%和144.00%,但重组有机碳(HFOC)、轻组有机碳(LFOC)和粗颗粒有机碳(CPOC)则分别下降了20.91%、46.44%和36.58%。水田土壤有机碳各组分含量均高于旱地土壤,但仅有MBC、FPOC和MOC含量高于湿地土壤。3种土地利用类型的土壤有机碳各组分含量的分配比例与其有机碳含量的规律一致。相关分析表明,3种土壤的有机碳组分中HFOC、LFOC、CPOC、MOC与SOC具有显著的相关关系,可以用来指示SOC的动态变化。这些结果说明,红树林湿地经人为垦殖后土壤SOC显著流失,但合理的耕作管理会使农田土壤具有更大的固碳潜力。

关键词: 降水变化, 青藏高原, NDVI最大值, 降水集度, 降水集中期

Abstract: The effect of land use change on soil organic carbon (SOC) is a major research context of global carbon cycling. SOC content and its fractions were determined from soils collected from three land use types including mangrove wetland (WS), dry land (converted from wetland, DS) and paddy soil (PS) in Zhangjiangkou, Fujian, China. Results showed that SOC content in WS soil was significantly higher than that in DS (by 29.50%) and PS (19.56%). Conversion of WS to DS increased the contents of dissolved organic carbon (DOC), microbial biomass carbon (MBC) and mineralassociated organic carbon (MOC) significantly by 40.39%, 248.43% and 144.00% respectively, while decreased the contents of heavy fraction organic carbon (HFOC), light fraction organic carbon (LFOC) and coarse particulate organic carbon (CPOC) contents by 20.91%, 46.44%, 36.58%, respectively. The content of all SOC fractions in PS were higher than in DS, but lower than in WS, except MBC, FPOC and MOC. Pearson correlation showed that SOC content significantly correlated to HFOC, LFOC, CPOC and MOC contents. These findings suggest that the conversion of mangrove wetland to dry land might trigger the loss of SOC, while soil C content could be increased by reasonable management.

Key words: Tibetan Plateau, precipitation concentration index, precipitation change, precipitation centroid, NDVI maximum.