Scanning Mode Application of Neutron-Gamma Analysis for Soil Carbon Mapping

Aleksandr KAVETSKIY; Galina YAKUBOVA; Nikolay SARGSYAN; Clyde WIKLE; Stephen A.PRIOR; Henry Allen TORBERT; Bryan A.CHIN

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Scanning Mode Application of Neutron-Gamma Analysis for Soil Carbon Mapping

机译：中子伽马分析的扫描模式在土壤碳测图中的应用

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Soil carbon mapping is extremely useful in assessing the effect of land management practices on soil carbon storage.Applications of neutron-gamma analysis in scanning mode for mapping of soil carbon are discussed.A Global Positioning System (GPS) device and softwares required to simultaneously acquire gamma signals and geographical positions during scanning operations were added to an existing measurement system.The reliability of soil carbon measurements in scanning mode was demonstrated to be in agreement with results acquired from static mode.The error analysis indicated that scanning measurements can be conducted with the same accuracy as static measurements in approximately one fourth the time.To obtain results suitable for mapping analogous to traditional chemical analyses (i.e.,± 0.5 in weight percent or ± 0.5 w％),scanning time over a given site should be ca.15 min using the current measurement system configuration.Based on this measurement time,a reasonable towing speed of 3-5 km h-1,the necessity for complete site coverage during scanning,the number of sites (within the surveyed field),and the required total measurement time can be estimated.Soil carbon measurements for 28 field sites (total area ca.2.5 ha) were conducted in ca.8 h.Based on acquired data,a soil carbon distribution map was constructed utilizing various softwares.The surveyed field area included an asphalt road that had carbon readings higher than the surrounding land.The clarity with which these carbon-rich zones were delineated on the constructed map represents evidence supporting the veracity of this method.Neutron-gamma analysis technology can greatly facilitate timely construction of soil carbon maps.

机译：土壤碳测绘在评估土地管理实践对土壤碳储存的影响方面非常有用。讨论了中子伽马分析在扫描模式下在土壤碳测绘中的应用。需要同时获取全球定位系统（GPS）装置和软件伽马信号和扫描操作过程中的地理位置被添加到现有的测量系统中。在扫描模式下土壤碳测量的可靠性与从静态模式获得的结果相符。在大约四分之一的时间内达到与静态测量相同的精度。要获得类似于传统化学分析的适合绘制结果的结果（即，重量百分比为±0.5或±0.5 w％），在给定位置的扫描时间应为约15分钟使用当前的测量系统配置。基于此测量时间，合理的牵引速度为3-5 km h-1，可以估算出扫描期间完全覆盖场地的必要性，场地的数量（在被调查区域内）以及所需的总测量时间。对28个场地（总面积约2.5公顷）的土壤碳测量在大约8小时内进行了研究。基于采集到的数据，使用各种软件构建了土壤碳分布图。被调查的野外区域包括一条沥青道路，该道路的碳读数高于周围的土地。在构造的地图上划定的区域代表了支持该方法准确性的证据。中子伽玛分析技术可以极大地促进及时建立土壤碳图。

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《土壤圈（英文版）》 |2019年第3期|334-343|共10页
作者
Aleksandr KAVETSKIY; Galina YAKUBOVA; Nikolay SARGSYAN; Clyde WIKLE; Stephen A.PRIOR; Henry Allen TORBERT; Bryan A.CHIN;
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United States Department of Agriculture-Agricultural Research Service(USDA-ARS), National Soil Dynamics Laboratory, Auburn AL 36832 USA;

United States Department of Agriculture-Agricultural Research Service(USDA-ARS), National Soil Dynamics Laboratory, Auburn AL 36832 USA;

Auburn University Detection and Food Safety Center, Samuel Ginn College of Engineering, Auburn AL 36849 USA;

Auburn University Detection and Food Safety Center, Samuel Ginn College of Engineering, Auburn AL 36849 USA;

United States Department of Agriculture-Agricultural Research Service(USDA-ARS), National Soil Dynamics Laboratory, Auburn AL 36832 USA;

United States Department of Agriculture-Agricultural Research Service(USDA-ARS), National Soil Dynamics Laboratory, Auburn AL 36832 USA;

Auburn University Detection and Food Safety Center, Samuel Ginn College of Engineering, Auburn AL 36849 USA;

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Scanning Mode Application of Neutron-Gamma Analysis for Soil Carbon Mapping

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