| 不同桉树人工林土壤呼吸旱雨季变化特征 |
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| 引用本文： | 竹万宽,王志超,许宇星,杜阿朋.不同桉树人工林土壤呼吸旱雨季变化特征[J].桉树科技,2017(4):27-32. |
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| 作者姓名： | 竹万宽 王志超 许宇星 杜阿朋 |
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| 作者单位： | 国家林业局桉树研究开发中心,广东 湛江,524022 |
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| 基金项目： | "十三五"国家重点研发计划课题，广东省林业科技创新专项资金项目，中央级公益性科研院所基本科研业务费专项资金青年培育项目，广东湛江桉树林生态系统国家定位观测研究站运行补助项目 |
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| 摘 要： | 以雷州半岛气候背景条件下具有良好培育前景的5种桉树人工林(湿加松林为对照)为研究对象,测定并分析各个林分土壤呼吸速率在旱季和雨季的差异,以揭示其与土壤温、湿度的关系.结果表明:土壤呼吸速率在旱季表现为先减后增变化趋势,在雨季表现为先增后减或逐渐减小变化趋势,旱、雨季变化特征明显.6个林分旱、雨季土壤呼吸速率均值分别为1.63~3.32μmol·m-2·s-1和2.55~4.36μmol·m-2·s-1.旱季土壤温、湿度共同促进土壤呼吸作用,雨季土壤温度促进土壤呼吸,土壤湿度抑制土壤呼吸作用.
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| 关 键 词： | 桉树人工林 土壤呼吸 土壤温度 土壤湿度 |
Study on Soil Respiration in Different Eucalyptus Plantations during the Dry and Rainy Season |
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| Abstract: | To determine and analyze differences in plantation soil respiration rates between the dry and rainy seasons, soil conditions were continuously monitored on the Leizhou Peninsula for six plantation types:Eucalyptus urophylla, E. pellita, Corymbia torelliana, E. camaldulensis, E. urophylla × E. grandis and Pinus elliottii × P. caribaea. Monitoring was carried out with a LI-8100A instrument (LI-COR, USA) to examine spatial and temporal variability in the soil respiration rate and temperatures and soil moisture levels were measured from March 2016 to February 2017. Results showed that soil respiration rate increased at first and then decreased during the dry season, whilst in the rainy season it first decreased but then increased or decreased gradually. The mean soil respiration rate was between 1.63 μmol·m-2·s-1 and 3.32 μmol·m-2·s-1 during the dry season and between 2.55 μmol·m-2·s-1 and 4.36 μmol·m-2·s-1 during the rainy season. Soil respiration was increased by higher by soil temperatures and soil moisture during the dry season, whilst during the rainy season it seemed to be increased by higher soil temperatures but inhibited by higher soil moisture. |
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| Keywords: | Eucalyptus plantation soil respiration soil temperature soil moisture |
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