Salinisation of agricultural soils poses an important constraint to sustainable agricultural development, especially in the Huinong region of Ningxia, northwestern China, where salinised soils are widely distributed. However, due to the limitations of monitoring technology, the detailed situation of soil salinisation in this region is not known. Currently, the multispectral instrument (MSI) on board the Sentinel-2 satellite provides a good opportunity for monitoring soil salinity dynamics. Therefore, in this study, the feasibility of using the multispectral instrument (MSI) on board the Sentinel-2 satellite, combined with a machine learning model, to accurately monitor the soil salinity content during the spring and summer seasons was explored. And three additional red-edge bands (B5-B7) were used instead of the traditional red band (B4) to generate potential soil salinity indices. A screening method based on the PLS-VIP criterion was used to screen the spectral covariates, and three machine learning methods, namely, Random Forest (RF), Support Vector Machine (SVM) and Extreme Learning Machine (ELM), were employed to build the inverse model of soil salt content. The results showed that the Random Forest model based on Sentinel-2 imagery performed the best in the inversion with good prediction results, with R2 and RE of 0.825 and 0.207 and 0.711 and 0.271 in spring and summer, respectively.The study also revealed that soil salinity varied significantly between seasons, and was higher in spring than in summer. This result is of great significance as a guide for soil salinity monitoring and land reclamation in arid or semi-arid regions.
目前,我国农业环境污染较为严重,农业生产中污染的产生与化肥、农药的过量输入相关,其深层次原因与我国的制度政策和农业环保意识薄弱相关,本文主要对农业污染进行研究,从农业污染的主要来源和农业污染形成原因方面入手,认真分析了污染的成因和来源,然后针对这些问题给出相应的对策和建议.
乡村振兴是当前我国农村发展的重要战略,而新型职业农民的培育成为推动乡村振兴的关键举措.要从完善培育对象遴选标准、精准对接培育需求、科学设计培育内容、构建完整的培育评估体系四个方面有效推进新型职业农民培育工作.
水资源是我们人类赖以生存和发展的重要资源,各个国家也越来越重视水资源短缺问题,我国是农业大国,河南省是农业大省,在水资源的利用中,农业用水占的比重较大.本文以河南省为例,通过分析河南省农业水资源的现状,研究河南省农业水资源利用过程中存在的问题,对其提出相应的解决措施.充分发挥政府和市场的作用,把"有形的手"与"无形的手"相结合,提高农业水资源利用率.
本文以新农村建设为背景,分析了山西省农业经济管理的意义、现状和存在的问题,提出了优化农业经济管理的策略,通过完善农业经济管理机制、完善农业金融扶持体系、进一步优化农业产业结构和推进农业经济管理信息化进程等措施,旨在促进山西省农业高质高效发展,增加农民收入和福祉,推动乡村产业融合发展,增强乡村文化自信和凝聚力.
