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最新文章
Rural E-Commerce Clusters: Spatiotemporal Evolution and Development Drivers for Taobao Villages in Cao County, Eastern China
摘要: [Objectives] To explore the spatiotemporal evolution and development drivers for Taobao villages in Cao County. [Methods] This paper employs GIS spatial analysis methods such as standard deviation ellipse and kernel density to characterize the spatial distribution, agglomeration, and correlation features of Taobao villages in Cao County at the township scale. Additionally, geographic detectors are used to explore influencing factors. [Results] (i) The number of Taobao villages in Cao County exhibits phased characteristics, progressing through initial, rapid expansion, and stable development stages. (ii) Taobao villages are unevenly distributed, with significant clustering features, primarily concentrated in the southeastern part of the county. In recent years, they have expanded toward the central and northwestern regions, potentially forming a "multi-core" spatial pattern in the future. (iii) The number of garment industries and e-commerce industrial parks consistently remains the primary factor influencing the spatial distribution of Taobao villages. After 2020, the number of wood processing industries and specialty agricultural product processing industries also exerted considerable influence. The number of logistics parks began to have an impact after 2018, albeit a weak one. Other factors had minimal influence on the differentiation of Taobao villages. [Conclusions] The spatiotemporal evolution exhibited diffusion along the "northwest-southeast" axis, with strengthened regional clustering. Government policies and industries significantly influenced the differentiation of Taobao villages, with varying primary factors across different periods.
关键词: Taobao village, Spatial-temporal distribution, Influencing factors, Cao County
Effects of Planting Density on Yield of Oilseed Rape (Brassica napus L.)
摘要: The rapeseed, as the second oilseed crop in China, is an important source of edible oil. Reasonable planting density can improve rapeseed production efficiency, and indirectly increase farmers’ the production enthusiasm of planting rapeseed. To gain a more comprehensive understanding of the study on effect of rapeseed yield to planting density, this article reviews the effect on planting density to yield in rapeseed, including the influences of the interaction between cultivation factors (variety, sowing period, and fertilization), the impact of plant density to lodging resistance and growth and development (biological characteristics, agronomic characteristics, yield traits, and quality tracts), and planting density and the relationship between light and planting density, are reviewed. The lodging resistance of oilseed rape and population yield of different rape varieties can be improved by choosing the appropriate sowing date and fertilizer application, and give full play to the rational utilization of resources and the maximization of benefits. The oilseed rape can make rational use of light and nutrients, which is conducive to dry matter accumulation and yield improvement, with proper planting density. This review will provide a theoretical basis and practical support for rapeseed planting, management, and mechanized production.
关键词: Rapeseed, Planting density, Yield, Effect
Optimization of Ultrasonic-Assisted Extraction Process for Anthocyanins from Lycium ruthenicum Murray
摘要: [Objectives] To investigate the optimal extraction conditions for anthocyanins from defatted Lycium ruthenicum Murray using ultrasonic-assisted solvent extraction. [Methods] Anthocyanins were extracted from wild L. ruthenicum in Qinghai Province using ultrasonic-assisted ethanol extraction. Through single-factor and orthogonal experiments, the optimal extraction conditions were determined as follows: temperature 50 ℃, solid-liquid ratio 1:15 (g/mL), ethanol concentration 60% (v/v), and ultrasonic extraction time 25 min. Under these conditions, the anthocyanin content of L. ruthenicum was quantified by UV-Vis spectrophotometry at 280 nm. [Results] The extraction yield of anthocyanins from wild Qinghai L. ruthenicum was 17.0 mg/g, which is superior to the yield of 10.0 mg/g obtained by water solvent extraction, representing a 0.7% increase in extraction rate. The anthocyanin content in L. ruthenicum from different regions was determined, revealing that samples from the Chaidamu area in Qinghai had the highest content (17.3 mg/g), while samples from the Gansu area had the lowest (12.0 mg/g). [Conclusions] Ultrasonic-assisted ethanol extraction technology offers advantages including rapid operation, low energy consumption, high extraction yield, simple detection, and safety.
关键词: Lycium ruthenicum Murray, Anthocyanins, Ultrasonic-assisted solvent extraction, Extraction yield