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The improvement of transportation infrastructure can reshape the economic geogra‐ phy patterns. The opening of high-speed railways promotes the flow of innovation elements among regions, enhances the knowledge spillover effect, affects regional innovation activities, or even affects the structure of regional knowledge innovation network. Based on the extant literature, this article summarized the relationship between high-speed railways and knowledge innovation in cities along railway lines in terms of the exact impact, differential performance and the mechanism, and further explained the micro mechanism of the impact of the opening of high-speed railways on regional knowledge innovation from the perspective of enterprises. According to the literature analysis, this article draws the following conclusions. Firstly, high-speed rail‐ ways do have an impact on knowledge innovation, but there are regional differences, which are related to geographical distance and urban heterogeneity. Secondly, the opening of high-speed railways promotes the flow and agglomeration of innovation factors, and expands knowledge spillover effects, which will affect regional knowledge innovation. However, both the agglomeration effect and knowledge spillover effect have two sides, so they show different influence effects in different regions. Thirdly, the opening of high-speed railways is conducive to expanding the commuting field, broadening knowledge channels and increasing temporary agglomeration, so as to increase the opportunities for enterprises to obtain innovative talents, cross-regional co‐ operation and knowledge sharing, and promote their innovative output. Finally, this article puts forward an analytical framework and some topics worthy of in-depth discussion. [ABSTRACT FROM AUTHOR]

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Copyright of Geography Teaching is the property of Geography Teaching Editorial Office, East China Normal University and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Agriculture has been making a new turn toward digitization in developed areas. However, in the underdeveloped ethnic regions of western China, does digitization represent a valuable opportunity or a serious challenge? In this article, Litang County, Sichuan Province, located in the western high plateau region, was taken as an example, and text analysis of multi-source data was performed, including of policy documents, planning texts, website information of agricultural companies and government departments, and materials based on semistructured interviews with local authorities and leading agricultural companies, with the purpose of discussing the dynamic mechanism of agricultural digitization in underdeveloped western counties. It was found that agricultural digitization in Litang has the following three typical characteristics: 1) full-chain digitization, that is, a closed-loop structure of data is formed through enterprise data centers, local data management platforms, and ecommerce platforms from various links such as vegetable and fruit breeding, planting, condensation logistics, and product sales; 2) multi-agent promotion, that is, agricultural companies, retailers, government departments and their agents, as well as social organizations, cooperate and promote each other in agricultural digital infrastructure construction, data technology application and data management, and agricultural resources integration; 3) coordination within and outside the county, namely timely response to the national rural revitalization strategy, corresponding poverty alleviation policies and local planning goals and action plans, coordination between the matching aid units and local departments and institutions in terms of the dual goals of economic benefits and poverty alleviation, and coordination between agricultural companies, social organizations, platform institutions and farmers, and other stakeholders within and outside the county. This study contributes to the establishment of a four-dimensional analysis framework of natural environment-market-institution-technology based on the institutional analysis of economic geography and enriches the research on economic geography in the field of agricultural digitalization. The main conclusions are as follows. First, the special natural environment in the high plateau area has shaped the constraint conditions and advantages of agricultural development in Litang, which encourages local companies to adopt a differentiation strategy, enter outside segment markets, and create a new evolutionary path using biological and digital technology. Second, the application of digital technology is not only beneficial to meet the needs of remote consumers for production information but also to provide feedback on timely changes in market demand for local agricultural companies, which is conducive to the adjustment and optimization of the decisions of agricultural producers. Technology investment increases production costs, which can be achieved by entering middle- and high-end markets to increase revenue. Third, the digital transformation of leader companies is not only the result of responding to or embedding national and local agricultural digitization strategies, but also puts forward potential requirements for the adjustment and optimization of local institutions and production organizations. Government and leadership companies jointly promote agricultural digitalization. In addition, the national matching poverty alleviation policy enables local governments to obtain scarce resources such as technology, capital, and market opportunities through external support, effectively reducing the risks and costs of digital transformation for leader companies, farmers, and other local production actors and promoting the spatial agglomeration of digital elements and resources through the external economies of the production network. However, it is crucial to take advantage of external support to cultivate local entrepreneurial talent and increase human capital for sustainable local development. [ABSTRACT FROM AUTHOR]

Copyright of Tropical Geography is the property of Tropical Geography Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)