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宇宙射线快中子法在土壤水分测量中的应用 ———以陕北六道沟流域为例
王秋铭; 王胜; 樊军
Source Publication中 国 水 土 保 持 科 学

 利用宇宙射线快中子法能够测量半径 300 m 左右源区内的土壤水分含量,其较大的测量源区填补了传统点
观测和遥感大面积观测尺度之间的空白。本文通过对比分析 COSMOS 土壤含水量与 TDT 土壤含水量,以验证宇宙
国产宇宙射线土壤水分观测系统(COSMOS)于 2014 年 5 月 21 日至 10 月 31 日对位于陕北神木县六道沟流域的坡
地土壤水分进行自动监测,并用测量区典型点取样法对其校正。同时在源区内的试验小区埋设 TDT 探头测量土壤
含水量。结果表明:COSMOS 土壤水分主要受源区内降水的影响,对每次降水不仅能做出灵敏反应,且反应剧烈程
度明显受降水量的影响。COSMOS 观测数据很好地反映了源区内坡地径流小区土壤水分的变化趋势。与 3 种土
地利用方式、2 个深度的 TDT 探头所测得土壤含水量的平均值呈显著的线性相关关系,R 2 = 0. 76,均方根误差为
0. 022 cm 3 /cm 3 。COSMOS 土壤含水量与 0 ~10 cm 土层含水量的相关系数均大于 10 ~20 cm 土层,从本试验的数据
来看,COSMOS 对于浅层(0 ~10 cm)土壤平均含水量适用性较好。TDT 探头所测得的坡耕地土壤平均含水量与
COSMOS 测得的土壤平均含水量的相关性略差于苜蓿地和撂荒地。本研究证实了宇宙射线土壤水分观测系统能

Other Abstract

 As an important component of water resources,soil moisture plays a crucial role in the energy
exchange between soil and atmosphere,and is also an important part of every ecosystem. The soil
moisture has a significant effect on the soil erosion process; therefore,it is very momentous to obtain the
soil moisture content accurately and continuously. As we all know it is very difficult to measure region-
scale soil moisture but now soil moisture at a horizontal scale of around 300 m can be observed by the
cosmic-ray fast neutron probe,which makes this method available to fill the gap between small scale of   traditional point measurement and large scale of remote sensing measurement. We compared soil
moistures form COSMOS and TDT to verify the accuracy of COSMOS and provide a method to measure the
soil moisture in wind-water erosion crisscross region. In this study,the domestic cosmic-ray soil moisture
observing system (COSMOS) was used to observe soil moisture of slope field in Liudaogou basin of
Shaanxi Province during the period of 21 May 2014 to 31 October 2014. TDT probes were set in 5 cm and
15 cm deep in the soil of all plots. Main results are presented as follows. COSMOS soil moisture was
mainly affected by precipitation and could reflect sensitivity on the precipitation. The results of the
COSMOS soil moisture well reflected the variation trend of soil moisture at the field scale,and had a
linear correlation with the average of the results measured by TDTs in two depths of three experimental
plots. The R 2 was 0. 76 and the root mean square error was 0. 022 cm 3 /cm 3 . We found the correlation
coefficient of COSMOS soil moisture and TDT soil moisture in 0 -10 cm were greater than those in 0 -20
cm from the comparison between the results measured by TDT in two depths of all experimental plots and
COSMOS. Based on this,we can consider that the average soil moisture measured by COSMOS was more
consistent with the water content of the soil near the surface. And we found the correlation coefficient of
COSMOS soil moisture and TDT soil moisture in slope land was slightly worse than alfalfa and abandoned
land from the comparison between the results measured by TDT in 0 -20 cm of all experimental plots and
COSMOS. In conclusion,COSMOS can be used to measure and record field soil moisture during a period
and provide more reliable ground data for the region-scale soil moisture and runoff prediction. It can also
provide verification data for the remote sensing inversion of soil moisture. It can be applied to continuous
observations of soil moisture in slopes of loess plateau and small watersheds,and provide data for soil
erosion prediction.

Keyword土壤含水量 农田尺度 Cosmos 陕北六道沟流域
Indexed By中文核心期刊要目总览
Document Type期刊论文
2.西北农林科技大学 黄土高原土壤侵蚀与旱地农业 国家重点实验室,712100,陕西杨陵
Recommended Citation
GB/T 7714
王秋铭,王胜,樊军. 宇宙射线快中子法在土壤水分测量中的应用 ———以陕北六道沟流域为例[J]. 中 国 水 土 保 持 科 学,2015,13(5):125-131.
APA 王秋铭,王胜,&樊军.(2015).宇宙射线快中子法在土壤水分测量中的应用 ———以陕北六道沟流域为例.中 国 水 土 保 持 科 学,13(5),125-131.
MLA 王秋铭,et al."宇宙射线快中子法在土壤水分测量中的应用 ———以陕北六道沟流域为例".中 国 水 土 保 持 科 学 13.5(2015):125-131.
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