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土壤活性有机碳及碳库管理指数对高寒湿地退化的响应

钱虹宇1,周宏鑫1,罗原骏1,蒲玉琳1*,张世熔2,李婷1,贾永霞1   

  1. (1四川农业大学资源学院, 成都 611130; 2四川农业大学环境学院, 成都 611130)
  • 出版日期:2020-07-10 发布日期:2021-01-09

Responses of soil labile organic carbon and carbon pool management index to alpine wetland degradation.

QIAN Hong-yu1, ZHOU Hong-xin1, LUO Yuan-jun1, PU Yu-lin1*, ZHANG Shi-rong2, LI Ting1, JIA Yong-xia1   

  1. (1College of Resources, Sichuan Agricultural University, Chengdu 611130, China; 2 College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China).
  • Online:2020-07-10 Published:2021-01-09

摘要: 探明高寒湿地土壤活性有机碳及碳库管理指数变化与湿地退化的关系,对退化湿地生态恢复具有重要意义。以若尔盖湿地自然保护区的相对原生沼泽(RPM)、轻度退化沼泽(LDM)、中度退化沼泽(MDM)、重度退化沼泽(HDM)和极重度退化沼泽(SDM)湿地土壤为对象,研究土壤总有机碳、活性有机碳组分含量及碳库管理指数对高寒湿地退化的响应。结果表明:0~100 cm范围内土层总有机碳(TOC)含量表现为RPM>LDM>MDM>HDM>SDM;与RPM相比,各退化湿地土壤的水溶性有机碳(WSOC)、溶解性有机碳(DOC)、易氧化有机碳(PXOC)含量均降低,尤以MDM、HDM和SDM降低显著,其WSOC、DOC和PXOC含量的降幅分别为25.79%~76.76%、35.90%~92.81%、32.07%~80.06%。随着湿地退化程度的加剧,3种活性有机碳的分配比例逐渐增加,碳库管理指数却逐渐减小。由此可见,高寒湿地退化可能会通过增加湿地土壤有机碳活性,降低土壤碳“汇”能力和湿地土壤质量。

关键词: 遥感生态指数, 遥感, 建筑用地指数, 生态, 建筑用地扩展, 晋江市

Abstract: Clarifying the effects of alpine wetland degradation on soil labile organic carbon and carbon pool management index (CPMI) is of great significance for ecological restoration of degraded alpine wetlands. We collected soil samples from relatively pristine (RPM), lightly degraded (LDM), moderately degraded (MDM), heavily degraded (HDM), and severely degraded marsh (SDM) to examine the responses of the contents of soil total organic carbon (TOC), labile organic carbon fractions, and carbon pool management index (CPMI) to wetland degradation in the Zoige Wetland Nature Reserve. The results showed that soil TOC content at 0-100 cm ranked in the order of RPM>LDM>MDM>HDM>SDM. Compared with RPM, the content of water soluble organic carbon (WSOC), dissolved organic carbon (DOC), and permanganate oxidized carbon (PXOC) in soils of all degraded alpine wetlands decreased, and the contents of WSOC, DOC and PXOC in MDM, HDM and SDM significantly decreased by 25.79%-76.76%, 35.90%-92.81%, and 32.07%-80.06% respectively. The ratio of soil labile organic carbon (WSOC/TOC, DOC/TOC, and PXOC/TOC) gradually increased with the aggravation of wetland degradation, while soil CMPI gradually decreased. Therefore, alpine wetland degradation may decrease soil carbon sink capacity and soil quality by increasing the activity of soil organic carbon.

Key words: remote sensing basedecological index (RSEI), Jinjiang., index-based built-up index (IBI), remote sensing, ecology, built-up land expansion