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首页> 外文期刊>Global change biology >Elevated carbon dioxide and irrigation effects on water stable aggregatesin a Sorghum field: a possible role for arbuscular mycorrhizal fungi
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Elevated carbon dioxide and irrigation effects on water stable aggregatesin a Sorghum field: a possible role for arbuscular mycorrhizal fungi

机译：高粱田中二氧化碳和灌溉对水稳定聚集体的影响：丛枝菌根真菌的可能作用

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摘要

While soil biota and processes are becoming increasingly appreciated as important parameters for consideration in global change studies, the fundamental characteristic of soil structure is a neglected area of research. In a sorghum [Sorghum bicolor (L.) Moench] field experiment in which CO2 [supplied using free-air CO2 enrichment (FACE) technology] was crossed factorially with an irrigation treatment, soil aggregate (1-2 mm) water stability increased in response to elevated CO2. Aggregate water stability was increased by 40% and 20% in response to CO2, at ample and limited water supply treatments, respectively. Soil hyphal lengths of arbuscular mycorrhizal fungi (AMF) increased strongly (with a threefold increase in the dry treatment) in response to CO2, and the concentrations of one fraction (easily extractable glomalin, EEG) of the AMF-produced protein glomalin were also increased. Two fractions of glomalin, and AMF hyphal lengths were all positively correlated with soil aggregate water stability. The present results further support the hypothesis that AMF can become important in global change scenarios. Although in this field study a causal relationship between hyphal length, glomalin and aggregate stability cannot be demonstrated, the present data do suggest that AMF could mediate changes in soil structure under elevated CO2. This could be of great importance in agricultural systems threatened by erosional soil loss.
机译：在全球变化研究中，土壤生物区系和过程日益被视为重要参数时，土壤结构的基本特征却被忽略了。在高粱[高粱双色（Moorg）]田间试验中，通过灌溉处理对二氧化碳（使用自由空气二氧化碳富集（FACE）技术提供）进行了分解，土壤集料（1-2毫米）的水稳定性提高了。对二氧化碳升高的反应。在充足和有限的供水处理下，总的水稳定性响应于CO2分别增加了40％和20％。丛枝菌根真菌（AMF）的土壤菌丝长度随着二氧化碳的增加而强烈增加（干处理增加了三倍），并且AMF产生的蛋白质glomalin的一小部分（易提取的glomalin，EEG）的浓度也增加了。 gloomalin和AMF菌丝长度的两个部分都与土壤团聚体的水稳定性成正相关。本结果进一步支持以下假设：AMF在全球变化场景中可能变得重要。尽管在该田间研究中无法证明菌丝长度，gloomalin和聚集体稳定性之间的因果关系，但目前的数据确实表明，AMF可以在二氧化碳浓度升高的情况下介导土壤结构的变化。这在受到侵蚀性土壤流失威胁的农业系统中可能非常重要。

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