摘要
运用新型频域反射（ FDR）技术和分频技术,实现传感器水盐同时测量。因土壤质地、容重等差异,土壤水盐标定是利用FDR监测土壤水盐过程中的必要环节。以东北壤土为试验对象,利用“由湿到干,由小到大”的土壤水盐运动规律,通过土柱试验,用烘干法和土壤溶液电导率法对FDR进行室内标定研究。同时,将时域反射（ TDR）式水盐传感器作为对照系,进行稳定性、精准度比较。结果表明：1）经土壤水分标定曲线校正后, FDR式水盐一体传感器具有很高的测量精度,可达±1%-3%；2）在土壤里对同一水盐含量进行百次重复测定, TDR传感器水分平均值为20．07%,相对标准偏差为0．18%；盐分（电导率）平均值为0．29 mS/cm,相对标准偏差为11．06%；新型FDR传感器水分平均值为20．08%,相对标准差为0．21%；盐分（电导率）平均值为0．31 mS/cm,相对标准差为8．49%。新型FDR土壤水盐一体传感器可用于农田土壤连续水盐监测,提供稳定、精确的基础数据,结合数据分析软件,指导种植生产。
A new type of FDR technology, which used frequency division technology and combined with sensor, was intro-duced for simultaneous measurement of soil water and salt. Due to the differences in soil texture, bulk density etc. , calibra-tion of FDR in site-specific soil water and salt was necessary in the process of soil water and salt monitoring with FDR. North-east soil was chosen as the research object, following the law of＂ from wet to dry, from small to big”, method by soil column experiment, the FDR calibration was conducted by indoor drying method and soil solution conductivity method. At the same time, the TDR type water salt sensor was chosen as the control to compare the precision and accuracy. The results showed that： 1） After the correction by soil moisture calibration curve, the FDR integrated sensor had high accuracy in salt and water determination, which was up to ＆#177; 1% -3%; 2） When measuring the same water and salt content in the soil with 100 repeats, when monitored with the TDR moisture sensor, average value of soil water was 20. 07%, the relative standard deviation was 0. 18%, the average salinity was 0. 29 mS/cm, and the relative standard deviation was 11. 06%; when the new FDR sensor was used, the average water content, the relative standard deviation, the salinity and the relative standard deviation was 20. 08%, 0. 21%, and 0. 31 mS/cm, and 8. 49%, respectively. New FDR sensor could be used for continuous monitoring of the soil water and salt, to provide stable and accurate basic database.
作者
郭佳
王振营
郑育锁
刘志杰
袁枫
文晓明
GUO Jia WANG Zhen-ying ZHENG Yu-suo LIU Zhi-jie YUAN Feng WEN Xiao-ming(Beijing University of Posts and Telecommunications, Beijing 100876 Shenyang Wei Figure Agricultural Science and Technology Co. Ltd. , Shenyang Liaoning 110026 Soil and Fertilizer Station of Tianjin, Tianjin 300061)
出处
《中国土壤与肥料》
CAS
CSCD
北大核心
2016年第6期156-161,共6页
Soil and Fertilizer Sciences in China
基金
天津市财政专项(2015-2016)"土壤墒情远程自动监测与预警项目"
科技型中小企业技术创新项目(2013-2016)"土壤水分远程监测与精准灌溉系统"(13C26212100963)
