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缙云山针阔混交林土壤各组分呼吸速率区分及其与环境因子的关系

于 雷 王玉杰 王云琦 张会兰 孙素琪 白雪琪

于 雷, 王玉杰, 王云琦, 张会兰, 孙素琪, 白雪琪. 缙云山针阔混交林土壤各组分呼吸速率区分及其与环境因子的关系[J]. 环境科学研究, 2014, 27(8): 865-872.
引用本文: 于 雷, 王玉杰, 王云琦, 张会兰, 孙素琪, 白雪琪. 缙云山针阔混交林土壤各组分呼吸速率区分及其与环境因子的关系[J]. 环境科学研究, 2014, 27(8): 865-872.
YU Lei, WANG Yu-jie, WANG Yun-qi, ZHANG Hui-lan, SUN Su-qi, BAI Xue-qi. Partition of Soil Respiration Components and Corresponding Relationships with Environmental Factors in Mixed Forest at Jinyun Mountain, Chongqing[J]. Research of Environmental Sciences, 2014, 27(8): 865-872.
Citation: YU Lei, WANG Yu-jie, WANG Yun-qi, ZHANG Hui-lan, SUN Su-qi, BAI Xue-qi. Partition of Soil Respiration Components and Corresponding Relationships with Environmental Factors in Mixed Forest at Jinyun Mountain, Chongqing[J]. Research of Environmental Sciences, 2014, 27(8): 865-872.

缙云山针阔混交林土壤各组分呼吸速率区分及其与环境因子的关系

基金项目: 国家林业公益性行业科研专项(201104009-03);引进国际先进林业科学技术项目(2012-4-40)

Partition of Soil Respiration Components and Corresponding Relationships with Environmental Factors in Mixed Forest at Jinyun Mountain, Chongqing

  • 摘要: 以重庆缙云山针阔混交林为试验地,开展针阔混交林土壤各组分呼吸速率的分离量化及其与环境因子之间的关系研究. 于2011—2013年生长季(4—9月),利用壕沟断根和移除凋落物方法区分RA(自养呼吸速率)、RH(异养呼吸速率)、RL(凋落物呼吸速率)及RSOM(有机质呼吸速率);同时,实地观测土壤各组分呼吸速率、AT(大气温度)、SR(太阳总辐射强度)、ST(5 cm深处土壤温度)和SW(5 cm深处土壤湿度),并通过相关性分析,研究土壤各组分呼吸速率与环境因子之间的关系. 结果表明:①除RL外,其他组分呼吸速率的月际变化均呈单峰曲线趋势,最大值均出现在6月或7月,月均值差异显著(P<0.05);土壤各组分呼吸速率年均值年际变化均不明显(P>0.05),但土壤各组分呼吸速率年均值之间存在显著差异(P<0.05). ②RA和RH分别占RT(土壤总呼吸速率)的27%和73%,RSOMSOM占RH的63%. ③除RL外,其他土壤组分呼吸均与AT和ST呈显著相关(P<0.05),表明AT和ST是影响土壤各组分呼吸速率的主要因子. ④指数模型最适用于描述该区AT和ST与土壤各组分呼吸速率之间的关系;除RL外,其他土壤组分呼吸对AT的敏感性Q10(温度每增加10 ℃所造成的呼吸速率改变的商)高于ST,并且不同组分呼吸的Q10之间存在差异.

     

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出版历程
  • 收稿日期:  2013-11-10
  • 修回日期:  2014-04-18
  • 刊出日期:  2014-08-25

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