自然资源学报 ›› 2011, Vol. 26 ›› Issue (1): 79-88.doi: 10.11849/zrzyxb.2011.01.008

• 资源生态 • 上一篇    下一篇

华西雨屏区不同密度巨桉人工林土壤呼吸特征

向元彬1, 胡庭兴1, 张健1, 涂利华1, 李仁洪1,2, 雒守华1, 黄立华1, 戴洪忠1   

  1. 1. 四川农业大学 林学院,四川省林业生态工程省级重点实验室,四川 雅安 625014;
    2. 四川省林业调查规划院, 成都 610081
  • 收稿日期:2010-06-17 修回日期:2010-08-25 出版日期:2011-01-30 发布日期:2011-01-30
  • 作者简介:向元彬(1983- ),男,主要从事森林培育和森林生态研究。E-mail: tbrain@163.com
  • 基金资助:

    "十一五"国家科技支撑计划子专题"华西雨屏区生态恢复与生态产业耦合技术与示范" (2006BAC01A11-03);四川省重点学科建设项目(SZD0419)。

Study on Soil Respiration in Eucalyptus grandis Plantations with Different Densities in Rainy Area of Western China

XIANG Yuan-bing1, HU Ting-xing1, ZHANG Jian1, TU Li-hua1, LI Ren-hong1,2, LUO Shou-hua1, HUANG Li-hua1, DAI Hong-zhong1   

  1. 1. College of Forestry, Sichuan Agricultural University, Laboratory of Forestry Ecology Engineering, the Provincial Key laboratory of Sichuan Province, Ya’an 625014, China;
    2. Sichuan Forestry Inventory and Plan Institute, Chengdu 610081, China
  • Received:2010-06-17 Revised:2010-08-25 Online:2011-01-30 Published:2011-01-30

摘要: 从2008-03至2009-02,采用闭合动态法(LI-6400-09)对华西雨屏区不同密度中龄巨桉人工林土壤呼吸进行了研究。结果表明:①该林分土壤呼吸具有明显的季节动态,各密度林分土壤呼吸速率最高值均出现在7月份,最低出现在1月,且密度为883株·hm-2(1.5 m×8 m)的巨桉林土壤呼吸速率最大,2 222株·hm-2(1.5 m×3 m)的最小;②2008年4、7、10月土壤呼吸速率24 h平均值均表现为883株·hm-2> 1 333株·hm-2> 2 222株·hm-2,且7月>4月>10月;③土壤微生物生物量碳氮、土壤有机质含量和10 cm根系生物量都表现出相同的趋势,即林分密度越小,土壤微生物生物量碳氮越高,草本植物越多,根系生物量越大,有机质含量越多;④温度是巨桉林土壤呼吸变异的主导因子,土壤呼吸速率与土壤温度和湿度的双因素模型优于单因素模型,两者共同解释了土壤呼吸速率月动态的78.3%~91.5%;⑤各密度林分土壤呼吸Q10值随巨桉林分密度增大而降低,大小顺序为3.65(883株·hm-2)>2.60(1 333株·hm-2)>2.55(2 222株·hm-2)。

关键词: 巨桉人工林, 土壤呼吸, Q10值, 华西雨屏区

Abstract: From Mar. 2008 to Feb. 2009, soil respiration was measured by infrared gas analyzers (LI-6400-09) of Eucalyptus grandis plantations with different stand densities in Rainy Area of Western China. The results were given as follows: Soil respiration in every stand with different densities exhibited a clear seasonal pattern, with the highest rate in July and the lowest in January, and the stand with the density of 883 plants per hectare had higher soil respiration rate (Rs), while the density with 2222 plants per hectare had lower soil respiration rate. The average respiration rate of 24-hour variation of soil respiration in April, July and October 2008 exhibited Rs(883)>Rs(1333)>Rs(2222), and Rs(July)>Rs(April)>Rs (October). The soil microbial biomass carbon and nitrogen, soil organic matter content and root biomass in 10 cm soil layer showed the same trend, the smaller the densities, the more their contents. Temperature was the main control factor of soil respiration variation. The two-factor model of soil temperature and moisture was better than the single-factor models, and it could explain 78.3%-91. 5% monthly variation of soil respiration. For the Q10 values of stands with different densities, the order was 3.65(833)>2.60(1333)>2.55(2222), implied the trend that the Q10 values decreased with the enhancement of stand density.

Key words: Eucalyptus grandis plantation, soil respiration, Q10 value, rainy area of western China

中图分类号: 

  • S714.2