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应用生态学报 ›› 2009, Vol. 20 ›› Issue (08): 1783-1790.

• 研究报告 •    下一篇

青藏高原东缘亚高山针叶林人工恢复过程中的土壤呼吸特征

周非飞1,2;林波1;刘庆1   

  1. 1中国科学院成都生物研究所, 成都 610041;2中国科学院研究生院, 北京 100039
  • 收稿日期:2009-01-23 出版日期:2009-08-20 发布日期:2009-08-20

Characteristics of soil respiration in artificial restoration process of subalpine coniferous forest in eastern Qinghai-Tibet plateau.

ZHOU Fei-fei1,2;LIN Bo1;LIU Qing1   

  1. 1Chengdu Institute of Biology,Chinese Academy of Sciences, Chengdu 610041, China;2Graduate University of Chinese Academy of Sciences, Beijing 100039, China
  • Received:2009-01-23 Online:2009-08-20 Published:2009-08-20

摘要: 采用动态密闭气室红外CO2分析法,对青藏高原东缘云杉人工林的土壤呼吸进行连续定位测定,并用挖壕沟法区分土壤自养呼吸和异养呼吸.结果表明:4种云杉林的土壤呼吸速率与土壤5 cm层温度有显著的正指数关系,与土壤含水量的相关性不显著.4种云杉林土壤呼吸年通量在792.08~1070.20 g C·m-2·a-1,大小依次为:天然云杉林>22年生云杉人工林>65年生云杉人工林>35年生云杉人工林,随着人工林的恢复呈先降低后升高的趋势.在森林恢复过程中,人工云杉土壤自养和异养呼吸年通量均先减少后增加, 在253.36~357.05 g C·m-2·a-1和538.69~703.82 g C·m-2·a-1范围变化.22年生、35年生、65年生云杉人工林和天然云杉林非生长季 (2007-11—2008-03)和生长季(2008-04—2008-10)的Q10值分别为:4.59、6.54、4.77、3.18和4.17、4.66、3.11、2.74.除22年生云杉人工林,Q10值随云杉林的恢复更新而逐渐降低, 且非生长季节Q10值均明显高于生长季节.

关键词: 云杉林, 土壤呼吸, 土壤自养呼吸, 土壤异养呼吸, 资源型地区, 工业集聚, 生态效率, 工业转型

Abstract: By the method of infrared CO2 determination in closed dynamic chamber system, the soil respiration in natural spruce forest, and 22-, 35-and 65-year old spruce plantations in eastern Qinghai-Tibet plateau was measured in situ, and the soil heterotrophic and autotrophic respiration was differentiated by entrenchment. In the four spruce forests, soil respiration rate had a significant positive exponential correlation with the soil temperature at depth 5 cm, but less correlation with the soil moisture content at the same depth. The annual soil respiration flux was 79208-107020 g C·m-2·a-1, and decreased in the order of natural spruce forest>22-year old spruce plantation>65-year old spruce plantation>35-year old spruce plantation. The annual soil autotrophic and heterotrophic respiration fluxes were 25336〖KG-*2〗-〖KG-*7〗35705 g C·m-2·a-1 and 53869〖KG-*2〗-〖KG-*7〗70382 g C·m-2·a-1, respectively, and had the same variation trend as the annual soil respiration flux. The Q10 value of soil respiration in 22-, 35-, and 65-year old spruce plantations and in natural spruce forest in growth season (from Nov. 2007 to Mar. 2008) and non-growth season (from Apr. 2008 to Oct. 2008) were 459, 654, 477, and 318, and 417, 466, 311, and 274, respectively. Except that in 22-year old spruce plantation, the Q10 value was decreased with increasing restoration year, and was obviously higher in non-growth season than in growth season.

Key words: spruce plantation, soil respiration, soil autotrophic respiration, soil heterotrophic respiration, industrial transformation., eco-efficiency, resource-based area, industrial agglomeration