地球科学进展 ›› 2022, Vol. 37 ›› Issue (9): 979 -990. doi: 10.11867/j.issn.1001-8166.2022.045

研究简报 上一篇    

宇宙射线中子技术的中尺度土壤水研究进展及在荒漠绿洲区的应用
田子晗 1 , 2( ), 张勇勇 1 , 2( ), 赵文智 1 , 2, 王丽莎 1 , 2, 王川 1 , 2, 康文蓉 1 , 2, 吴绍雄 1 , 2   
  1. 1.中国科学院西北生态环境资源研究院,临泽农田生态系统国家野外科学观测研究站,内陆河流域 生态水文重点实验室,甘肃 兰州 730000
    2.中国科学院大学,北京 100049
  • 收稿日期:2022-03-17 修回日期:2022-07-09 出版日期:2022-09-10
  • 通讯作者: 张勇勇 E-mail:tianzihan20@mails.ucas.ac.cn;zhangyongyong@lzb.ac.cn
  • 基金资助:
    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”(42071044);中国科学院青年创新促进会项目(2020420)

A Review of Researches and Application to Mesoscale Soil Moisture in Desert-Oasis Regions Using the Cosmic-ray Soil Moisture Observation System

Zihan TIAN 1 , 2( ), Yongyong ZHANG 1 , 2( ), Wenzhi ZHAO 1 , 2, Lisha WANG 1 , 2, Chuan WANG 1 , 2, Wenrong KANG 1 , 2, Shaoxiong WU 1 , 2   

  1. 1.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
    2.University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2022-03-17 Revised:2022-07-09 Online:2022-09-10 Published:2022-09-28
  • Contact: Yongyong ZHANG E-mail:tianzihan20@mails.ucas.ac.cn;zhangyongyong@lzb.ac.cn
  • About author:TIAN Zihan (1997-), male, Qianjiang City, Hubei Province, Master student. Research area includes soil hydrology in arid regions. E-mail: tianzihan20@mails.ucas.ac.cn
  • Supported by:
    the National Natural Science Foundation of China “Study on mesoscale soil moisture patterns in mountains of arid regions using a cosmic-ray neutron rover”(42071044);The Youth Innovation Promotion Association of the Chinese Academy of Sciences(2020420)

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N0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 N0 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.

中图分类号: 

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