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首页> 外文期刊>Biogeochemistry >Autotrophic and heterotrophic soil respiration in a Norway spruce forest: estimating the root decomposition and soil moisture effects in a trenching experiment
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Autotrophic and heterotrophic soil respiration in a Norway spruce forest: estimating the root decomposition and soil moisture effects in a trenching experiment

机译：挪威云杉林的自养和异养土壤呼吸：在挖沟实验中估算根分解和土壤水分的影响

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摘要

The two components of soil respiration, autotrophic respiration (from roots, mycorrhizal hyphae and associated microbes) and heterotrophic respiration (from decomposers), was separated in a root trenching experiment in a Norway spruce forest. In June 2003, cylinders (29.7 cm diameter) were inserted to 50 cm soil depth and respiration was measured both outside (control) and inside the trenched areas. The potential problems associated with the trenching treatment, increased decomposition of roots and ectomycorrhizal mycelia and changed soil moisture conditions, were handled by empirical modelling. The model was calibrated with respiration, moisture and temperature data of 2004 from the trenched plots as a training set. We estimate that over the first 5 months after the trenching, 45% of respiration from the trenched plots was an artefact of the treatment. Of this, 29% was a water difference effect and 16% resulted from root and mycelia decomposition. Autotrophic and heterotrophic respiration contributed to about 50% each of total soil respiration in the control plots averaged over the two growing seasons. We show that the potential problems with the trenching, decomposing roots and mycelia and soil moisture effects, can be handled by a modelling approach, which is an alternative to the sequential root harvesting technique.
机译：在挪威云杉林的根沟试验中，将土壤呼吸的两个组成部分，即自养呼吸（来自根，菌根菌丝和相关微生物）和异养呼吸（来自分解剂）分离了。 2003年6月，将气瓶（直径29.7厘米）插入到土壤深度50厘米处，并在开沟区域的外部（对照）和内部进行了呼吸测量。通过经验建模处理了与挖沟处理，根的分解增加和根外菌根菌丝体增加以及土壤湿度条件改变相关的潜在问题。该模型已用来自挖沟区的2004年的呼吸，水分和温度数据作为训练集进行了校准。我们估计，在挖沟后的前5个月中，挖出地块呼吸的45％是该处理的假象。其中29％是水分差异效应，而16％是根和菌丝体分解产生的。在两个生长季节平均的对照样地中，自养和异养呼吸分别占土壤总呼吸的50％。我们表明，挖沟，分解根和菌丝体以及土壤水分影响的潜在问题可以通过建模方法来解决，这是顺序收获根茎技术的替代方法。

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