中国农业气象2026，Vol.47Issue(1)：48-62,15.DOI:10.3969/j.issn.1000-6362.2026.01.005
宇宙线快中子法在典型绿洲农田土壤水分监测的适用性
Applicability of Cosmic-ray Neutron Sensing(CRNS)for Soil Moisture Monitoring in Typical Oasis Farmland Ecosystems
摘要
Abstract
Cosmic-ray neutron sensing(CRNS)method is a new technology enabling soil moisture detection at hectometer scales,bridging the gap between traditional point measurements and remote sensing.This study evaluated the applicability of CRNS in a typical oasis farmland ecosystem using in-situ data collected at the Wulanwusu Agro-meteorological Experiment Station of the China Meteorological Administration from May to November 2020,including CRNS measurements,single-point oven-drying gravimetric data,frequency-domain reflectometry(FDR)data and distributed gravimetric data.The study focused on the relationship between the regional soil moisture content obtained by the CRNS using the N0 parameter method and the soil moisture content measured by the single-point oven-drying gravimetric method,the FDR method and the distributed oven-drying gravimetric method.The results indicated that the soil moisture content measured by CRNS correlates well with that measured by the single-point oven-drying gravimetric method,especially reflecting the moisture variation characteristics of the surface soil layer(0-30cm)in the experimental site,with a maximum correlation coefficient of 0.66.Due to the influence of the FDR sensor installation depth,CRNS exhibited higher sensitivity to precipitation events than the FDR method.The multilayer mean values of soil moisture content measurements by the FDR method and the CRNS method exhibited a significant linear relationship.For the 0-30cm soil moisture layer,the coefficient of determination R2 was 0.57,and the root mean square error(RMSE)was 0.018 cm³·cm⁻³.When compared with the distributed oven-drying gravimetric method,the coefficients of determination(R2)for CRNS were 0.61,0.61,0.52 and 0.30 for the 0-5cm,0-10cm,0-20cm and 0-35cm soil layers,respectively,with corresponding RMSE values of 0.015,0.010,0.011 and 0.017cm3·cm-3.In oasis farmland ecosystems,compared to the single-point oven-drying gravimetric method,the FDR method and the distributed oven-drying gravimetric method,the CRNS more accurately reflected the spatiotemporal variation of soil moisture at the regional scale and was more sensitive to minor or low-intensity prolonged precipitation events.It also achieves a more accurate measurement of the average surface soil moisture content.关键词
宇宙线快中子法/土壤水分/烘干称重法/频域反射法Key words
Cosmic-ray neutron sensing/Soil moisture/Oven-drying gravimetric method/Frequency domain reflection引用本文复制引用
吴苏,吴东丽,王中金,阙艳红,赵杰,刘志浩..宇宙线快中子法在典型绿洲农田土壤水分监测的适用性[J].中国农业气象,2026,47(1):48-62,15.基金项目
中国气象局新型机载激光雷达技术应用试验项目(ZQC-R21098) （ZQC-R21098）
中国气象局·河南省农业气象保障与应用技术重点开放实验室开放研究基金项目(2AMF202103) （2AMF202103）
郑州市重大科技创新专项项目(2020CXZX0043) （2020CXZX0043）
河南省重点研发专项项目(241111220900) （241111220900）
