The effect of microbial activity on soil water diffusivity.
The effect of microbial activity on soil water diffusivity.
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DOI：
10.1111/ejss.12535
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发表时间：
2018-05
影响因子：
4.2
通讯作者：
Whalley WR
中科院分区：
文献类型：
--
作者：
Choudhury BU;Ferraris S;Ashton RW;Powlson DS;Whalley WR
在本研究中，我们探讨了在实验室条件下，微生物活动对砂质土壤岩心水分蒸发的影响。我们通过添加不同数量的合成类似物根分泌物来应用处理来刺激微生物活性。为了进行比较，我们使用没有合成根系分泌物的土壤样本作为对照，并使用氯化汞处理的样本来抑制微生物活性。我们的结果表明，微生物活性的增加降低了土壤的蒸发速率。在添加最多根分泌物的土壤中，估计的扩散系数是通过添加氯化汞抑制微生物活动的样品中估计的扩散系数的三分之一。我们讨论了我们的结果对根系吸水的影响。我们研究了微生物活动对沙质土壤岩心水分蒸发的影响。我们发现微生物活性对水分释放特性的影响很小。微生物活性的增加减少了土壤的蒸发，而微生物的抑制则增加了土壤的蒸发。微生物活动对根系吸水的影响被估计为相当于土壤结构的改变。
In this study, we explored the effects of microbial activity on the evaporation of water from cores of a sandy soil under laboratory conditions. We applied treatments to stimulate microbial activity by adding different amounts of synthetic analogue root exudates. For comparison, we used soil samples without synthetic root exudates as control and samples treated with mercuric chloride to suppress microbial activity. Our results suggest that increasing microbial activity reduces the rate of evaporation from soil. Estimated diffusivities in soil with the largest amounts of added root exudates were one third of those estimated in samples where microbial activity was suppressed by adding mercuric chloride. We discuss the effect of our results with respect to water uptake by roots. We explored effects of microbial activity on the evaporation of water from cores of a sandy soil. We found the effect of microbial activity on water release characteristic was small. Increasing microbial activity reduced evaporation from soil, while microbial suppression increased it. Effect of microbial activity on root water uptake was estimated to be equivalent to a change in soil structure.
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