摘要
采用1000 MHz天线的便携式探地雷达(GPR)系统对中国黑龙江省尚志市东北林业大学帽儿山实验林场2个10 m×10 m样地内的兴安落叶松根系进行探测,比较GPR探测结果与实地挖掘数据,分析探地雷达技术对兴安落叶松不同根径大小(0.2~0.5、0.5~1.0、1.0~2.0、2.0~3.0、3.0~4.0、4.0~5.0和>5.0 cm)和不同土壤深度(0~10、10~20和20~30 cm)根系的识别率。结果表明:1000 MHz的GPR对根径>2.0 cm的根系识别率达到49.8%,探地雷达反射波的最大时间间隔、总时间间隔、最大振幅面积和总振幅面积与根径均呈显著正相关;对于根径<2.0 cm的根系,GPR的识别率极低,仅为6%。随着土壤深度的增加,根系识别率呈先增加后减小的趋势;在10~20 cm土层中根系识别率最大,为31.4%,在0~10 cm土层中根系识别率最小,为10.2%。探地雷达能有效识别根径(>2.0 cm)较大的兴安落叶松根系,而且对10~20 cm土层中根系具有最高的识别率,而对于小直径和深层兴安落叶松根系的探测能力仍有待提高。
Adopting a portable ground penetrating radar(GPR)with 1000 MHz antenna,we detected the root system of Larix gmelinii in two 10 m×10 m plots at Mao’ershan Experiment Forest Farm,Heilongjiang Province.The GPR detection results were compared with field empirical data,and analyzed the identification rate of GPR techno-logy on different root diameter sizes(0.2-0.5,0.5-1.0,1.0-2.0,2.0-3.0,3.0-4.0,4.0-5.0,and>5.0 cm)of L.gmelinii and soil depths(0-10,10-20,and 20-30 cm).The results showed that for roots with diameter greater than 2.0 cm,the identification rate of 1000 MHz GPR reached 49.8%,with the maximum time interval,total time interval,maximum amplitude area,and total amplitude area of GPR reflection waves being significantly positively correlated with root diameter.For roots with diameter<2.0 cm,the identification rate of GPR was extremely low(6%).As the soil depth increased,root identification rate showed a trend of increasing and then decreasing.The root identification rate was highest at 31.4%in the 10-20 cm soil layer and lowest at 10.2%in the 0-10 cm soil layer.GPR could effectively identify root systems of L.gmelinii with larger diameters(>2.0 cm),and showed an optimal identification rate for root systems in the 10-20 cm soil layer.However,its detection ability for small dia-meter root and deep root of L.gmelinii should be improved.
作者
杨钧涵
李婷婷
龙福强
李明娟
王秀伟
孙涛
YANG Junhan;LI Tingting;LONG Fuqiang;LI Mingjuan;WANG Xiuwei;SUN Tao(School of Forestry,Northeast Forestry University,Harbin 150040,China;CAS Key Laboratory of Forest Ecology and Management,Institute of Applied Ecology,Chinese Academy of Sciences,Shenyang 110016,China)
出处
《应用生态学报》
北大核心
2025年第6期1715-1721,共7页
Chinese Journal of Applied Ecology
基金
国家重点研发计划项目(2022YFD2201300)资助。
关键词
探地雷达
根系探测
根径大小
识别率
土壤深度
ground penetrating radar
root detection
root diameter
identification rate
soil depth
