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林业科学 ›› 2013, Vol. 49 ›› Issue (3): 9-16.doi: 10.11707/j.1001-7488.20130302

• 论文 • 上一篇    下一篇

若尔盖高寒嵩草草甸湿地不同水分条件下土壤有机碳的垂直分布

蔡倩倩1, 郭志华1, 胡启鹏2, 武高洁1   

  1. 1. 中国林业科学研究院湿地研究所 北京 100091;2. 嘉汉林业(中国)投资有限公司 广州 510613
  • 收稿日期:2012-03-08 修回日期:2013-01-20 出版日期:2013-03-25 发布日期:2013-03-25
  • 通讯作者: 郭志华

Vertical Distributin of Soil Organic Carbon and Carbon Storage under Different Hydrologic Conditions in Zoigê Alpine Kobresia Meadows Wetland

Cai Qianqian1, Guo Zhihua1, Hu Qipeng2, Wu Gaojie1   

  1. 1. Institute of Wetland Research, CAF Beijing 100091;2. Sino-Forest (China) Investment Corp.Ltd. Guangzhou 510613
  • Received:2012-03-08 Revised:2013-01-20 Online:2013-03-25 Published:2013-03-25

摘要: 研究若尔盖高寒嵩草草甸湿地常年积水、季节性积水(每年6-10月积水)和无积水3种水分条件下土壤有机碳的分布特征。结果表明: 若尔盖高寒嵩草草甸湿地土壤有机碳含量极高,表土层(0~10 cm)最高可达73.2 g ·kg-1,是中国森林、农田和草原生态系统土壤有机碳含量的6~10倍,且土壤有机碳的垂直分布深达400 cm,远远超过中国森林、农田和草原生态系统; 在浅土层(0~50 cm)和深土层(200~400 cm),不同水分条件下的高寒嵩草草甸湿地土壤有机碳含量差异显著(P<0.05),在0~50 cm浅土层表现为常年积水区>季节性积水区>无积水区,在200~400 cm深土层表现为无积水区>季节性积水区>常年积水区,而在50~200 cm中间土层,不同水分条件下高寒嵩草草甸湿地土壤有机碳含量无显著差异(P>0.05); 在0~400 cm土层,不同水分条件下的高寒嵩草草甸湿地土壤C/N值多小于15,这有利于高寒湿地土壤碳的积累; 若尔盖嵩草草甸湿地的有机碳储量极高,常年积水区、季节性积水区和无积水区在0~400 cm土层的有机碳储量分别为64.87,71.21和76.45 kt·km-2,是中国森林、农田和草原生态系统的20~40倍; 约60%的土壤有机碳储量分布在1 m以下土层; 整个若尔盖高原地区的高寒嵩草草甸土壤总有机碳储量约为0.245 Pg。

关键词: 土壤有机碳, 有机碳储量, 嵩草草甸, 水分条件, 若尔盖高寒湿地

Abstract: The soil organic carbon(SOC) and carbon storage of Zoigê alpine Kobresia meadows wetland under no water logging, perennial water-logging and seasonal water-logging(during June to October)conditions were studied. The results showed that the SOC of Zoigê alpine Kobresia meadows wetland was extreme high and that in the surface layer of the soil (0-10 cm) reached to 73.2 g·kg-1, 6-10 times higher than the forest, farmland and grassland ecosystem in China. The vertical distribution reached to 400 cm under ground, which was far more than the forest, farmland and grassland ecosystem in China. There were significant differences (P<0.05) in SOC between shallow soil layer (0-50 cm) and deep soil layer (200-400 cm) over different hydrologic conditions. In the shallow soil layer (0-50 cm) the SOC rank was: perennial water-logging >seasonal water-logging >no water-logging, and in the layer 200-400 cm the rank was: no water-logging > seasonal water-logging > perennial water-logging, while in the soil layer 50-200 cm there was no significant difference in the SOC (P>0.05). In the soil layer 0-400 cm, the C/N ratio of alpine Kobresia meadows wetland over different hydrologic conditions mostly was less than 15, which was beneficial to the accumulation of soil carbon. The carbon storage of Zoigê alpine Kobresia meadows wetland was at a very high level, the soil carbon storage of perennial water-logging, seasonal water-logging and no water-logging was 64.87,71.21 and 76.45 kt·km-2 respectively, which was 20-40 times higher than the forest, farmland and grassland ecosystem in China. Approximate 60% of soil carbon storage distributed under the 1m soil layer. The total soil carbon storage of Zoigê alpine Kobresia meadows wetland was about 0.245 Pg.

Key words: soil organic carbon, soil organic carbon storage, Kobresia meadows, different hydrologic conditions, Zoigêalpine wetland

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