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首页> 外文期刊>Tropical Conservation Science >Controls of Temporal Variations on Soil Respiration in a Tropical Lowland Rainforest in Hainan Island, China
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Controls of Temporal Variations on Soil Respiration in a Tropical Lowland Rainforest in Hainan Island, China

机译：中国海南岛热带低地雨林土壤呼吸的时间变异控制

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Soil respiration represents the largest carbon (C) flux from terrestrial ecosystems to the atmosphere. We created a study site in tropical lowland rainforest and used static chamber method to measure the temporal variations of soil respiration and their relationship with environmental factors at monthly time scale. The temporal variations of soil respiration showed a seasonal pattern related to soil temperature (p??.01) and soil moisture (p??.05). We tested different regression models to explore the relationship between soil respiration and environmental factors. Soil respiration had a better fit with soil temperature than with soil moisture in single-factor models. At different temperatures, the Qsub10/sub values from different models changed in rather different ways. We found that the mixed quadratic model composite of soil temperature and moisture had the best-fitting effect (Rsup2/sup?=?.74) on soil respiration and could better explain the seasonal variation. In a certain soil moisture range close to 15%, soil respiration increased with soil temperature. However, soil respiration became restricted when the moisture was greatly higher or lower than this value. Furthermore, at low soil temperatures (lower than 16°C), higher soil moisture could decrease soil respiration rapidly. Thus, soil respiration in a tropical lowland rainforest is co-controlled by soil temperature and moisture. This study expands our observations of soil respiration in tropical forests and how it responds to environmental factors, which is important for reducing errors in evaluation and scaling up of soil carbon flux in climate change studies.
机译：土壤呼吸代表从地面生态系统到大气中的最大碳（C）助焊剂。我们在热带低地雨林中创建了一项研究现场，并使用了静态腔室方法，以测量月呼吸的时间变化及其与月度尺度环境因素的关系。土壤呼吸的时间变化显示出与土壤温度有关的季节性模式（p ?? 01）和土壤水分（p ?? 05）。我们测试了不同的回归模型，以探索土壤呼吸与环境因素之间的关系。土壤呼吸与土壤温度更好地贴合，而不是单因素模型中的土壤水分。在不同的温度下，来自不同模型的Q 10 值以相当不同的方式改变。我们发现土壤温度和水分的混合二次模型复合材料具有最佳效果（R 2 =α.74），可以更好地解释季节性变化。在某种土壤水分范围内接近15％，土壤温度增加了土壤呼吸。然而，当水分大大或低于该值时，土壤呼吸受到限制。此外，在低土壤温度（低于16℃）的情况下，较高的土壤水分可能会迅速降低土壤呼吸。因此，热带低地雨林中的土壤呼吸由土壤温度和水分共同控制。本研究扩大了热带森林中土壤呼吸的观察以及它如何应对环境因素，这对于减少气候变化研究中的土壤碳通量的评估和扩大的误差是重要的。

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