Water cost savings from soil biochar amendment: A spatial analysis,Global Change Biology Bioenergy

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Water cost savings from soil biochar amendment: A spatial analysis
Global Change Biology Bioenergy ( IF 5.9 ) Pub Date : 2020-10-08 , DOI: 10.1111/gcbb.12765
Jennifer E. Kroeger ₁ , Ghasideh Pourhashem _{2,

3} , Kenneth B. Medlock ₃ , Caroline A. Masiello _{1,

3}

Affiliation

While a large body of literature exists on the ability of biochar to retain water and nutrients, little research exists connecting these benefits to biochar qualities, water retention mechanisms, and optimal locations for agricultural use. More information is needed for biochar stakeholders to make informed decisions about where deployment should occur. Specifically, we need to know the biochar characteristics that drive changes in soil water properties, how these effects vary geographically, and what financial benefits farmers can expect in their specific region to identify where biochar can be deployed for optimal results. We conducted a meta‐analysis of the relationship between biochar properties, application rates and observed change in water holding capacity (WHC) as a function of soil texture. Then we mapped our results across US counties to determine where biochar application could yield the largest improvements in soil water properties and added an economic model designed to predict how biochar‐driven changes in soil WHC drive irrigation expenses. Limited data drove our focus to sandy soils, and among these locations, our results suggest that biochar application will be especially effective in the southeast, far north and northeast, and western United States. In a prototype application of our model we predict a 37% reduction in irrigated water use for an instrumented site in Nebraska. Our combined statistical and economic models will be useful for future field experiment proposals, farmers purchasing biochar, and decision makers working to incentivize agricultural advances.

中文翻译：

土壤生物炭改良节省的水成本：空间分析

尽管存在大量关于生物炭保留水分和养分的能力的文献，但很少有研究将这些益处与生物炭的品质，保水机理和农业用途的最佳位置联系起来。生物炭利益相关者需要更多信息来做出有关应在何处进行部署的明智决策。具体来说，我们需要了解驱动土壤水质变化的生物炭特征，这些影响在地理上如何变化以及农民在其特定区域可以期望的财务收益，以确定可以在何处部署生物炭以获得最佳结果。我们对生物炭特性，施用量和观察到的持水量（WHC）变化与土壤质地之间关系的关系进行了荟萃分析。然后，我们将研究结果绘制在美国各县之间，以确定在哪些地方施用生物炭可以最大程度地改善土壤水质，并增加了一个经济模型，旨在预测生物炭驱动的土壤WHC变化如何驱动灌溉费用。有限的数据将我们的注意力集中在沙质土壤上，在这些位置中，我们的结果表明生物炭的应用在美国东南部，远北和东北以及美国西部尤为有效。在我们模型的原型应用中，我们预测内布拉斯加州的仪器站点的灌溉用水量将减少37％。我们的统计和经济模型相结合，将对未来的田间试验建议，农民购买生物炭以及鼓励农业发展的决策者很有用。

更新日期：2020-12-10

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