基于高光谱的梭梭幼苗生境土壤氮素含量估算模型研究  

Study on Estimation Model of Soil Nitrogen Content in Haloxylon ammodendron Seedlings Habitats Based on Hyper-spectral Data

作　　者：王泽[1] 轩俊伟 任财 麻浩[1] 罗艳丽[1] 邓策 梁燕[3] 范亚楠 WANG Ze;XUAN Junwei;REN Cai;MA Hao;LUO Yanli;DENG Ce;LIANG Yan;FAN Yanan(College of Pratacultural and Environmental Sciences,Xinjiang Agricultural University,Xinjiang Key Laboratory of Soil and Plant Ecological Processes,Urumqi 830052,China;Agricultural and Rural Bureau of Jimusar County,Jimusar 831700,China;Forestry Workstation of Management General Station in Xinjiang Production and Construction Corps,Urumqi 830013,China)

机构地区：[1]新疆农业大学草业与环境科学学院/新疆土壤与植物生态过程实验室,新疆乌鲁木齐830052 [2]新疆吉木萨尔县农业农村局,新疆吉木萨尔831700 [3]新疆生产建设兵团林业工作管理总站,新疆乌鲁木齐830013

出　　处：《广东农业科学》2020年第1期68-76,共9页Guangdong Agricultural Sciences

基　　金：国家自然科学基金(31800384);新疆维吾尔自治区区域协同创新专项科技援疆计划项目(2017E0237);新疆维吾尔自治区创新环境(人才、基地)建设专项天山创新团队计划项目(20170201092)。

摘　　要：【:目的】研究荒漠区梭梭幼苗植株冠层光谱特征,建立基于高光谱的幼苗生境土壤氮素含量最佳估测模型,为荒漠区植物与土壤养分状况的实时监测与精确诊断提供重要依据。【方法】以古尔班通古特沙漠梭梭幼苗及其生境土壤为研究对象,采用便携式光谱仪测定幼苗植株冠层光谱反射率,结合室内分析的幼苗生境土壤氮素含量,利用统计学方法分析幼苗植株冠层光谱与生境土壤氮素含量之间的关系。【结果】生长期内幼苗植株冠层光谱反射率一阶微分与土壤氮素含量在403~485、509~538、677~806、1489~1616 nm波段范围内呈显著正相关,其中在428、516、751、801、1534 nm处呈极显著正相关,以751 nm处的相关系数最大,为最强敏感波长。【结论】基于植株冠层光谱反射率一阶微分敏感波段建立的反演模型Y=133.186X751+8.803,其决定系数最大,相对误差最小,拟合效果最优,预测精度较高,可作为荒漠区梭梭幼苗生境土壤氮素含量的最优估算模型。【Objective】The study aimed to explore the characteristics of canopy spectral reflectance of Haloxylon ammodendron seedlings,establish the best estimation model of soil nitrogen content in seedlings habitats based on hyper spectral,and provide an important basis for real-time monitoring and accurate diagnosis of plant and soil nutrient status in desert area.【Method】The H.ammodendron seedlings and soil of habitats in Guerbantonggute Desert were used as the research objectives.The canopy spectral reflectance of H.ammodendron seedlings were measured by the portable spectrometer.Combined with the indoor analysis on the soil nitrogen content in seedlings habitats,Stepwise Regression Method was used to analyze the relationship between canopy spectral reflectance and soil nitrogen content in seedlings habitats.【Result】During the growth period,the relationship between the canopy first derivative spectral reflectance of seedlings and soil nitrogen content was significantly positively correlated in the band ranges of 403-485 nm,509-538 nm,677-806 nm and 1489-1616 nm.There was extremely significantly positive correlation at the 428 nm,516 nm,751 nm,801 nm and 1534 nm,and the correlation coefficient was maximum at 751 nm,which was the most sensitive wavelength.【Conclusion】Based on the canopy first derivative spectral reflectance of seedlings at the sensitive bands,the inversion model Y=133.186X751+8.803 is established,which shows that the determination coefficient is maximum and the relative error is minimum,with optimal fitting effect and higher prediction precision.It can be used as the best estimation model for soil nitrogen content in H.ammodendron seedlings habitats.

关 键 词：梭梭幼苗 光谱特征 土壤氮素 估算模型 荒漠生态系统 

分 类 号：S728[农业科学—林木遗传育种] S151.93[农业科学—林学]