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林业科学 ›› 2005, Vol. 41 ›› Issue (2): 1-7.doi: 10.11707/j.1001-7488.20050201

• 论文及研究报告 •    下一篇

杉木人工林林地土壤CO2释放量及其影响因子的研究

方晰 田大伦 项文化 闫文德 康文星   

  1. 中南林学院生态研究室,长沙410004
  • 收稿日期:2004-05-18 修回日期:1900-01-01 出版日期:2005-03-25 发布日期:2005-03-25

Soil CO2 Release Rate and Its Effect Factors in Chinese Fir Plantation

Fang Xi,Tian Dalun,Xiang Wenhua,Yan Wende,Kang Wenxing   

  1. Research Section of Ecology, Central South Forestry University Changsha410004
  • Received:2004-05-18 Revised:1900-01-01 Online:2005-03-25 Published:2005-03-25

摘要:

采用碱液吸收法对湖南省会同生态定位站郁闭杉木人工林林地土壤CO2 释放量进行测定,并分析温度、水分和土壤C/N比对林地土壤CO2 释放量的影响。结果表明:郁闭杉木人工林林地土壤CO2 释放量在0.1052~0.5590g·m-2 h-1 之间变化,且具有一定的季节变化规律,总体趋势是夏季高,其他季节低;林地土壤CO2 释放量与林内气温、土壤各层(0、5、10、15、2 0cm)温度和土壤各层(0、10、2 0cm)含水量在一定范围内呈一元线性正相关,与土壤C N比也呈一元线性正相关;以林内气温、土壤各层(0、5、10、15、2 0cm)温度为依据得到的Q10依次为2.08、2.22、1.94、2.28、2.51、2.23;林地土壤CO2 释放量与林内气温的相关性最强,为极显著相关,偏相关系数为0.916 (p<0.01) ,与土壤各层(0、5、10、15、2 0cm)温度也是极显著相关,偏相关系数均在0.818以上(p<0.01) ,但与土壤C N比和土壤各层(0、10、20cm)含水量相关不显著,偏相关系数为0.452~0.612 (p>0.05 )

关键词: 杉木人工林, 土壤CO2释放量, 温度, 土壤含水量, 土壤C/N比

Abstract:

Soil CO2 release rates in a closed Chinese Fir plantation were investigated by using alkali absorption technique and the influence of air temperature within the stand, soil temperature, soil water content and soil C/N ratio on soil CO2 release rate were analyzed at Huitong Ecological Station, Hunan Province. The results showed that the CO2 release rates in the closed Chinese Fir plantation soil ranged from 0.105 2 g·m-2h-1to 0.559 0 g·m-2h-1, which followed a conspicuous seasonal change pattern. The rate of CO2 release rate in summer was higher than that in other seasons. To some degree, soil CO2 release rate was positive linearly correlated with air temperature within stands, soil temperature(within the depth from 0 to 5 cm depth, from 5 to 10 cm depth, from 10 to 15 cm depth and 20 cm depth, respectively), soil water content at the surface, at the depth of 10 cm and the depth of 20 cm depth, and also soil C/N ratio. The calculated Q10 values based on air temperature in the stands, soil temperature at surface, 5 cm, 10 cm, 15 cm and 20 cm depth were 2.08, 2.22, 1.94, 2.28, 2.51 and 2.23, respectively. The results of the partial correlative analysis on the relationship between soil CO2 effluxes and environment factors indicated that the greatest significant correlative relationship was found for the air temperature within stand, partial correlative coefficient was up to 0.916(p<0.01). The next greatest significant correlative relationship was observed for temperature of different soil layers, all partial correlative coefficients were up to 0.818(p<0.01). However, there were no significant for the correlative relationship between soil CO2 effluxes and soil C/N ratio, soil water content at the surface, at the depth of 10 cm and the depth of 20 cm depth, the partial correlative coefficients ranged from 0.452 to 0.612(p>0.05).

Key words: Chinese Fir plantation, soil CO2 release rate, temperature, soil water content, soil C/N ratio