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• 干旱区盐碱土碳过程专栏 • 上一篇    下一篇

准噶尔盆地南缘草本层碳通量及土壤呼吸的变化特征

范连连1,2,3,谢继萍1,2,3,马健1**,王忠媛1,2,3,赵红梅1,2,3   

  1. (1中国科学院新疆生态与地理研究所, 荒漠与绿洲生态国家重点试验室, 乌鲁木齐 830011; 2中国科学院大学, 北京 100049; 3中国科学院阜康荒漠生态系统研究站, 新疆阜康 831500)
  • 出版日期:2013-10-10 发布日期:2013-10-10

Variation characteristics of herb layer carbon flux and soil respiration in southern edge of Jungggar basin, Northwest China.

FAN Lian-lian1,2,3, XIE Ji-ping1,2,3, MA Jian1**, WANG Zhong-yuan1,2,3, ZHAO Hong-mei1,2,3   

  1. (1State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China; 2University of Chinese Academy of Sciences, Beijing 100049, China; 3Fukang Station of Desert Ecology, Chinese Academy of Sciences, Fukang 831500, Xinjiang, China)
  • Online:2013-10-10 Published:2013-10-10

摘要:

利用LI-840以及LI-8100土壤呼吸测量仪,对准噶尔盆地南缘草本层片碳通量以及沙丘不同部位的土壤呼吸速率进行了测量,探讨了草本层片碳通量季节动态以及日过程的变化特征,沙丘不同部位土壤呼吸速率的年变化特征以及环境因子对草本层片碳通量以及土壤呼吸速率的影响。结果表明:草本层片碳通量不仅在日尺度上呈现单峰的变化趋势,在季节尺度上也呈现相同的变化趋势。生长旺盛季草本层碳通量日过程变化幅度较大,草本层片净碳交换(NEE)从-2.5~0.02 μmol·m-2·s-1,草本层总生产力(GEP)则从-4.4~-1.1 μmol·m-2·s-1,而9月份以后则基本维持在0附近。通过分析碳通量与环境因子的关系,草本层片碳通量与土壤温度呈正相关关系,草本层土壤呼吸(ER)与光合有效辐射呈正相关关系,而草本层GEP与光合有效辐射则呈负相关关系。沙丘不同部位(沙丘顶部、中部、底部)土壤呼吸速率年动态变化为双峰型,且不同坡位之间土壤呼吸速率差异显著。

 

关键词: 群落, 氢氧同位素, 北京山区, 水分来源

Abstract: By using LI-840 and LI-8100, this paper measured the carbon flux in herb layer as well as the soil respiration rate in different dune parts in southern Junggar Basin, Northwest China, and studied the seasonal and diurnal variation characteristics of the carbon flux in herb layer, the annual variation characteristics of soil respiration rate in different dune parts, and the effects of environmental factors on the carbon flux and the soil respiration rate. The carbon flux in the herb layer exhibited a unimodal pattern both in diurnal and seasonal scales. The diurnal carbon flux in herb layer had a large fluctuation during vigorous growth season. In the herb layer, the net carbon exchange (NEE) ranged from -2.5 to 0.02 μmol·m-2·s-1, the total productivity (GEP) ranged from -4.4 to -1.1 μmol·m-2·s-1, and the carbon flux after September was maintained at near 0. Through the analysis on the relationships between the carbon flux and environmental factors, it was observed that there was a positive correlation between the herb layer carbon flux and soil temperature and between the soil respiration and PAR, whereas a negative correlation between the GEP and PAR. The annual soil respiration rate in different sand dune parts (top, middle, and bottom) presented a bimodal dynamic pattern, and there existed significant differences in the soil respiration rate among different slope positions.

Key words: Beijing mountainous area, community, hydrogen and oxygen isotopes., water source