Hyperspectral Inversion of Phosphorus Content in Surface Soil under Different Utilization Modes in Hulunbuir Grassland

doi:10.11733/j.issn.1007-0435.2024.10.014

Acta Agrestia Sinica ›› 2024, Vol. 32 ›› Issue (10): 3141-3150.DOI: 10.11733/j.issn.1007-0435.2024.10.014

Hyperspectral Inversion of Phosphorus Content in Surface Soil under Different Utilization Modes in Hulunbuir Grassland

WANG Meng-tao¹, HE Jing¹, BU He², LIU Yu¹, DIAO Zhao-yan³, ZHOU Yu-jing¹, SU De-rong¹

1. Research Center of Grassland Ecology and Resources, Beijing Forestry University, Beijing 100091, China;
2. Forestry and Grassland Bureau of Ewenke Autonomous Banner, Hulunbeier City, Hulunbeier, Inner Mongolia 0211002, China;
3. Chinese Research Academy of Environmental Sciences, Beijing 100012, China

Received:2024-01-03 Revised:2024-02-20 Published:2024-11-04

呼伦贝尔草原不同利用方式下表层土壤磷元素含量的高光谱反演

王萌韬¹, 贺晶¹, 布和², 刘禹¹, 刁兆岩³, 周雨静¹, 苏德荣¹

1. 北京林业大学草地资源与生态研究中心, 北京 100091;
2. 内蒙古呼伦贝尔市鄂温克族自治旗林业和草原局, 内蒙古呼伦贝尔 0211002;
3. 中国环境科学研究院, 北京 100012

通讯作者: 贺晶,E-mail:hejing_606@163.com
作者简介:王萌韬(1999-)，男，汉族，陕西西安人，硕士研究生，主要从事草资源与生态研究，E-mail：w165403719@163.com
基金资助:
国家自然科学基金(32201335)资助

Abstract

Abstract: Phosphorus is a necessary nutrient for the normal growth and development of plants. Studying the phosphorus content in grassland soil under different utilization methods is a prerequisite for better grassland protection and restoration. This article took the Huihe National Nature Reserve in Inner Mongolia as the research area. Field investigations were conducted to collect surface soil (0-30 cm) from 18 plots under three different utilization methods (grazing,enclosure,and cutting). The total phosphorus and available phosphorus content as well as spectral data of the surface soil were measured. The analysis showed that total phosphorus content was not significantly different between enclosure and cutting land,but was significantly higher in enclosure and cutting lands than in grazing land. Available phosphorus content was significantly higher in enclosure than in grazing and cutting lands. The hyperspectral inversion of total and available phosphorus content in surface soil using Partial least-square method(PLSR),Back propagation neural netwok (BPNN),and Randomforest (RF) models showed that the PLSR had high prediction accuracy for soil phosphorus under three different utilization methods,with R² values greater than 0.90 and RMSE values less than 16.00 for total and available phosphorus inversion;RF were in the middle of the pack in terms of predictive effectiveness. The BPNN only had a certain predictive effect for total and available phosphorus in cutting lands. The research results would provide basic support for soil monitoring in grassland areas.

Key words: Hulunbeier grassland, Utilization, Hyperspectral, Surface soil, Phosphorus content

摘要： 磷是植物生长发育必需的营养元素，研究不同利用方式下草原土壤磷素的含量状况，是更好地开展草原保护修复工作的前提。本文以内蒙古辉河国家级自然保护区为研究区域，野外实地调查采集了三种不同利用方式(放牧、围封、刈割)共18个样地的表层(0~30 cm)土壤，室内测定了表层土壤的总磷和有效磷含量以及光谱数据。分析表明：围封地和刈割地总磷含量差异不显著，二者总磷含量均显著高于放牧地，而围封地有效磷含量显著高于放牧地和刈割地。通过偏最小二乘(Partial least-square method，PLSR)、随机森林(Randomforest，RF)和BP神经网络(Back propagation neural netwok，BPNN)三种模型对表层土壤磷含量进行高光谱反演表明：PLSR对三种利用方式下土壤磷素的反演稳定性最强，对总磷和有效磷反演的R²均大于0.90，RMSE值均小于16.00；RF次之，BP神经网络仅适用于刈割地的总磷和有效磷反演。研究结果以期此模型为草原区土壤磷含量动态监测提供基础支撑。

关键词: 呼伦贝尔草原, 利用方式, 高光谱, 表层土壤, 磷素含量

CLC Number:

S812.8

WANG Meng-tao, HE Jing, BU He, LIU Yu, DIAO Zhao-yan, ZHOU Yu-jing, SU De-rong. Hyperspectral Inversion of Phosphorus Content in Surface Soil under Different Utilization Modes in Hulunbuir Grassland[J]. Acta Agrestia Sinica, 2024, 32(10): 3141-3150.

王萌韬, 贺晶, 布和, 刘禹, 刁兆岩, 周雨静, 苏德荣. 呼伦贝尔草原不同利用方式下表层土壤磷元素含量的高光谱反演[J]. 草地学报, 2024, 32(10): 3141-3150.

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Hyperspectral Inversion of Phosphorus Content in Surface Soil under Different Utilization Modes in Hulunbuir Grassland

呼伦贝尔草原不同利用方式下表层土壤磷元素含量的高光谱反演

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