引用本文:王晓晴,孙孝林,王会利.应用伽马射线和可见近红外光谱测定土壤容重[J].土壤学报,2019,56(4):994-1003.
WANG Xiaoqing,SUN Xiaolin,WANG Huili.Determination of Soil Bulk Density withGamma Ray and Visible-near Infrared Spectroscopy[J].Acta Pedologica Sinica,2019,56(4):994-1003
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应用伽马射线和可见近红外光谱测定土壤容重
王晓晴1, 孙孝林1, 王会利2
1.中山大学地理科学与规划学院,广东省城市化与地理环境空间模拟重点实验室;2.广西壮族自治区林业科学研究院
摘要:
现有的土壤容重测定方法存在诸多不足,不能满足快速发展的精准农业、生态环境模拟、土壤碳储量估算等对大量、准确容重数据的需求。鉴于此,有研究提出γ射线衰减与可见-近红外并用测定土壤容重的方法,并成功地将该方法应用于土壤碳储量估算中,得到了较好的应用结果。为了检验该方法在我国南方丘陵区土壤容重测定上的准确性和适用性,本研究采集了广西南宁丘陵区的土壤样品,使用该方法计算出土壤容重,并与传统环刀采样烘干称重法的容重结果进行比较。结果表明,两者测定的土壤容重具有较高的回归决定系数, R2 可达0.92,且两者间的均方根误差较低,仅占土壤容重平均值的4.48%。因此,本研究认为,γ射线衰减与可见-近红外并用测定土壤容重在我国南方丘陵区有较好的准确性和适用性。
关键词:  土壤容重  γ射线衰减  可见近红外光谱
DOI:10.11766/trxb201808310246
分类号:
基金项目:国家自然科学基金项目(41771246)、土壤与农业可持续发展国家重点实验室基金项目(Y20160004)、中央高校基本科研业务费专项资金项目(161gpy07)
Determination of Soil Bulk Density withGamma Ray and Visible-near Infrared Spectroscopy
WANG Xiaoqing1, SUN Xiaolin1, WANG Huili2
1.Guangdong Provincial Key Laboratory of Urbanization and Geo-simulation, School of Geography and Planning, Sun Yat-sen University;2.State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences
Abstract:
The existing methods for measuring soil bulk density are found to have a number of deficiencies, for instance, they fail to meet the demands of rapid development of precision agriculture, modeling of ecological environment, and assessment of soil carbon storage for a large volume of accurate bulk density data. Therefore, researchers have worked out a technique that combines gamma-ray attenuation and visible-near infrared spectroscopy for determination of soil bulk density, and has been successfully applied to estimating soil carbon storage. In order to test this method for accuracy and applicability in measuring soil bulk density in hilly regions of South China, soil samples were collected from a hilly area of Nanning, Guangxi for analysis of soil bulk densities with this method. And then comparison was made of this method with the traditional one of using cutting rings to collect soil samples and oven-drying the samples for weighing in accuracy of the measurement. Results show that two methods were similar in accuracy, and both quite high in regression R2 , up to 0.92, and low in root mean square error between the two, accounting only for 4.48% of the means of the soil bulk densities obtained. It is, therefore, concluded that besides being time-saving, inexpensive and non-destructive, this method using γ-ray attenuation and visible-near infrared to determine soil bulk densities is quite high in accuracy and applicability in the hilly regions of South China.
Key words:  Soil bulk density  Gamma-ray attenuation  Visible-near infrared spectroscopy