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林业科学 ›› 2014, Vol. 50 ›› Issue (2): 1-7.

• 论文与研究报告 • 上一篇    下一篇

华北低丘山地不同土地利用条件下的土壤呼吸比较

赵娜1, 孟平1,2, 张劲松1,2, 陆森1,2, 程志庆1   

  1. 1. 中国林业科学研究院林业研究所 北京 100091;
    2. 国家林业局林木培育重点实验室 北京 100091
  • 收稿日期:2013-09-22 修回日期:2014-01-03 出版日期:2014-02-25 发布日期:2014-03-11
  • 基金资助:

    “十二五”国家科技支撑计划项目(2011BAD38B06)。

Comparison of Soil Respiration under Various Land Uses in Hilly Area of Northern China

Zhao Na1, Meng Ping1,2, Zhang Jinsong1,2, Lu Sen1,2, Cheng Zhiqing1   

  1. 1. Research Institute of Forestry, Chinese Academy of Forestry Beijing 100091;
    2. Key Laboratory of Tree Breeding and Cultivation of State Forestry Administration Beijing 100091
  • Received:2013-09-22 Revised:2014-01-03 Online:2014-02-25 Published:2014-03-11
  • Contact: 孟平

摘要:

基于气体红外分析技术,在华北低丘山地退耕还林区内,以农田、撂荒地为对照,分析退耕43年和退耕10年刺槐人工林土壤呼吸速率的季节变化及其环境影响机制。结果表明:退耕43年和退耕10年刺槐人工林0~5 cm土层的土壤有机质含量分别是农田的3.9和1.6倍;退耕43年刺槐人工林、退耕10年刺槐人工林、撂荒地和农田的全年土壤呼吸平均速率分别为2.33,1.21,2.40和2.04 μmol ·m-2s-1,其中撂荒地的全年土壤呼吸平均速率最大,退耕43年刺槐林的全年土壤呼吸平均速率大于退耕10年刺槐林;研究区内4种土地条件下的土壤呼吸速率主要受5 cm深处土壤温度影响,退耕43年刺槐林、退耕10年刺槐林、撂荒地及农田的土壤呼吸温度敏感系数Q10分别为2.47,2.53,2.06和1.56,其中2种退耕林地的Q10均显著高于农田;4种土地利用条件下的Q10均存在显著的季节变异,其大小主要受温度影响。退耕还林工程的实施显著改善了土壤固碳能力。

关键词: 土壤呼吸, Q10, 退耕还林工程, 华北低丘山地

Abstract:

In this study, seasonal variations in soil respiration rate (Rs) in 43-year-old and 10-year-old Robinia pseudoacacia plantations, abandoned land and cropland, and the influence mechanisms were investigated in hilly area of northern China. In 0-5 cm layers, soil organic matter content of 43-year-old and 10-year-old R. pseudoacacia plantations was 3.9 and 1.6 times of cropland, respectively. Annual soil respiration rates of 43-year-old and 10-year-old R. pseudoacacia plantations, abandoned land and cropland were 2.33, 1.21, 2.40, and 2.04 μmol·m-2 s-1, respectively. The cropland had the highest annual Rs, and the annual Rs of 43-year-old R. pseudoacacia plantation was significantly higher than that of 10-year-old R. pseudoacacia plantation. Regression analysis showed that soil temperature was the main environmental factor affecting the seasonal variation of Rs. The temperature sensitivity (Q10) of soil respiration was 2.47, 2.53, 2.06, and 1.56 for 43-year-old and 10-year-old R. pseudoacacia plantations, abandoned land, and cropland, respectively. Compared to the cropland, two plantations presented a more temperature sensitivity of soil respiration. Moreover, there was a significant seasonal variation in Q10 in the four land uses, and soil temperature was the key factor that affected the temperature sensitivity of soil respiration. The results indicated that sequestration capacity of soil organic carbon was improved in the two plantations.

Key words: soil respiration, Q10, grain-for-green program, hilly area of northern China

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