摘要
宇宙射线中子技术是观测土壤水分的新方法,通过近地表宇宙射线中子强度反演土壤水分,可以监测百米尺度范围内平均土壤水分状况,为中尺度土壤水研究提供数据支撑。重点综述了快中子强度与氢原子数呈反比的宇宙射线中子技术的观测原理,分析影响中子强度的气压、空气湿度、太阳活动、磁场强度、道路和中子数计量等因素,归纳了剔除非土壤水氢源的中子强度反演土壤水的关系模型,总结了计算土壤水校正点权重的方法,概述了国内外观测应用进展。在此基础上,利用移动式宇宙射线中子技术在河西走廊荒漠绿洲区进行土壤水分观测,观测的均方根误差为0.03 g/g,参数N_(0)为690 counts/30s,该技术较好地实现了该区域中尺度土壤水分测定。荒漠区0~30 cm土层,夏季和秋季的土壤水资源量分别为6.8 mm和19.4 mm;绿洲区0~15 cm土层,夏季和秋季的土壤水资源量分别为50 mm和44 mm,研究为荒漠绿洲区土壤水资源评价和绿水利用提供了科学依据。
Cosmic-ray Soil Moisture Observation System(COSMOS)is a new method for measuring mesoscale soil moisture,which can estimate soil moisture within hundred-meter scale by observing neutron counts from soil layers.We summarize the principle of COSMOS observation,analyze the factors including atmospheric pressure,air humidity,solar activity,magnetic intensity,road,and counting neutrons that affect the neutron intensity,review the method inverting neutron counts to mesoscale soil moisture,summarize the spatial weights of in-situ soil moisture calibration samples and the research advancements of observation and application.Also,we used Cosmic-ray neutron rover to measure soil moisture in a desert-oasis regions of Hexi Corridor.The RMSE was 0.03 g/g,and parameter N_(0)was 690 counts/30s.It demonstrated the rover could be applied to monitor mesoscale soil moisture in the desert-oasis regions.In the desert regions,soil water resources in 0~30 cm depth were 6.8 mm and 19.4 mm in summer and autumn,respectively.In the oasis regions,soil water resources in 0~15 cm depth were 50 mm and 40 mm in summer and autumn,respectively.The research can provide a scientific basis for the evaluation of soil water resources in the desert-oasis regions.
作者
田子晗
张勇勇
赵文智
王丽莎
王川
康文蓉
吴绍雄
TIAN Zihan;ZHANG Yongyong;ZHAO Wenzhi;WANG Lisha;WANG Chuan;KANG Wenrong;WU Shaoxiong(Northwest Institute of Eco-Environment and Resources,National Field Science Research Station of Farmland Ecosystem in Linze,Chinese Ecosystem Research Network,Key Laboratory of Inland River Basin Ecohydrology,Chinese Academy of Sciences,Lanzhou 730000,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《地球科学进展》
CAS
CSCD
北大核心
2022年第9期979-990,共12页
Advances in Earth Science
基金
国家自然科学基金项目“基于移动式宇宙射线技术的干旱区山地中尺度土壤水分研究”(编号:42071044)
中国科学院青年创新促进会项目(编号:2020420)资助
关键词
宇宙射线中子技术
中尺度
土壤水分
荒漠绿洲
土壤水资源
Cosmic-ray Soil Moisture Observation System(COSMOS)
Mesoscale
Soil moisture
Desertoasis
Soil water resources
作者简介
First author:田子晗(1997-),男,湖北潜江人,硕士研究生,主要从事干旱区土壤水文研究.E-mail:tianzihan20@mails.ucas.ac.cn;通信作者:张勇勇(1986-),男,陕西旬邑人,研究员,主要从事土壤水文、生态水文研究.E-mail:zhangyongyong@lzb.ac.cn
