Choudhury B U, Ferraris S, Ashton R W, Powlson D S, Whalley W R
Department of Sustainable Agricultural Sciences Rothamsted Research Harpenden AL5 2JQ UK.
Division of Natural Resource Management ICAR (RC) for NEH Region, Umiam, Ri-Bhoi Meghalaya 793 103 India.
Eur J Soil Sci. 2018 May;69(3):407-413. doi: 10.1111/ejss.12535. Epub 2018 Jan 30.
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.
在本研究中，我们在实验室条件下探究了微生物活动对沙质土壤土芯水分蒸发的影响。我们通过添加不同量的合成类似物根系分泌物来施加处理以刺激微生物活动。为作比较，我们使用未添加合成根系分泌物的土壤样本作为对照，并使用经氯化汞处理以抑制微生物活动的样本。我们的结果表明，增加微生物活动会降低土壤的蒸发速率。添加根系分泌物量最大的土壤中的估计扩散率是添加氯化汞抑制微生物活动的样本中估计扩散率的三分之一。我们讨论了我们的结果对根系水分吸收的影响。
我们探究了微生物活动对沙质土壤土芯水分蒸发的影响。我们发现微生物活动对水分释放特性的影响较小。增加微生物活动会减少土壤蒸发，而抑制微生物活动则会增加蒸发。微生物活动对根系水分吸收的影响估计相当于土壤结构的变化。
