3PL参与下考虑绿色度和生鲜度的农畜产品供应链决策优化及利益协调

为了实现3PL参与下考虑绿色度和生鲜度的农畜产品供应链利益协调,文章构建了"农畜产品供应商+农畜产品加工企业+3PL服务商"的农畜产品供应链结构,采用斯塔克尔伯格博弈方法,结合农畜产品供应链的订单农业、股权合作、产销一体等三种生产经营模式,围绕农畜产品的特点以及消费者对农畜产品绿色度和生鲜度的要求,研究了分散决策、合作决策以及集中决策模式下农畜产品供应链各参与主体的最优决策及利润;在此基础上,分别设计了成本共担契约、纳什讨价还价模型以及考虑风险态度和讨价还价能力的利益协调机制来实现订单农业、股权合作、产销一体等三种生产经营模式下农畜产品供应链的利益协调。最后,通过数值分析验证了利益协调机制的有效性。

生鲜度影响需求下的水产品供应链协调

生鲜度是评价水产品质量的重要指标,也是影响水产品供应链流通环节损耗重要因素。当前我国水产品供应链环节损耗不容乐观,基于生鲜度影响需求下的水产品供应链协调问题,成为当前水产品供应链研究重要课题。本文主要从水产品供应链生鲜度现状入手,对生鲜度影响需求下的水产品供应链协调对策进行研究。

借鉴美国经验优化我国农产品电子商务发展的路径

生鲜电子商务的交易模式迎合了当前互联网购物的大趋势,也是我国农业产业化发展的重要手段。从保持农产品生鲜度的角度来看,目前我国的生鲜电子商务面临着一些问题,包括物流成本高、标准化低、物流体系基础薄弱等。促进生鲜电商的健康快速发展要借鉴国外优秀生鲜电商的成功经验,并结合自身特点,在充分破解当前困境的同时促进生鲜电商的不断升级和完善。

Study on height growth model of Pinus koraiensis

Growth model is an efficient way to study growing process of some factors of plants quantitatively. Height growth of Korean pine (Pinus koraiensis) was studied by using Hyperbola equation, Logistic equation, Richards equation with three parameters, and Richards equation with four parameters in this paper. The results showed that Richards equation with four parameters was the most suitable and could be turned into other theoretical equations when some parameters were given different value. The maximum height of trees could be given in advance when using Richards equation with four parameters, and it was even more corresponding to reality. In addition, a height growth model with real height of fixed age as a parameter was discussed in this paper. This kind of growth model could be used to calculate height growth of a given tree effectively.

Impacts of Primo MAXX Growth Regulator on the Growth of Bermuda Grass

[Objective] The aim was to investigate the effects of Primo MAXX growth regulator on growth of Bermuda grass,explore appropriate application concentration of Primo MAXX on Bermuda grass,and provide basis for the application of Primo MAXX in Bermuda meadow.[Method]The height,leaf colour and the aerial part＇s fresh weight of Bermuda grass treated with different concentrations were researched using single factor random block test.[Result]Primo MAXX application effectively reduced the height in all treatment without significant difference;appropriate application of Primo MAXX can enrich the color;and 35 days after application,Bermuda grass roots were become thicker.[Conclusion]The application of Primo MAXX with effective dose of 150-300 g/hm2 on Bermuda grass in southern China is more appropriate.

Research Progress in Formation and Detection Method of Dextran in Sugarcane Production

Dextran in sugarcane production process is formed by Leuconostoc rnesenteroides. The content levels of dextran is related to sugarcane varieties, field condition （planting pattern, temperature, humidity, sunlight, soil, foreign material）, de- gree of injury （refractory cane, harvesting methods）, and can be rapidly and accu- rately measured by Dextran Immunonephelometric Test Kit. The presence of dextran indicates that sucrose has been lost, so sugarcane dextran is a direct and reliable indicator to measure sugarcane freshness and quality.

Diversity patterns and phylogenetic structure of vascular plants along elevational gradients in a mountain ecosystem, South Korea

Recently, a phylogenetic diversity and community structure analysis as complementary to species-centric approaches in biodiversity studies provides new insights into the processes of community assembly. In this study, we analyzed species and phylogenetic diversity and community structures for woody and herbaceous plants along two elevational transects on Mt. Baekhwa, South Korea. The species richness and phylogenetic diversity of woody plants showed monotonic declining patterns with increasing elevation along all transects, whereas herbaceous plants showed different patterns, such as no relationship and a reversed unimodal pattern, between the study transects. The main drivers of these patterns were climate and habitat variables for woody and herbaceous plants, respectively. In addition, the phylogenetic community structure primarily showed phylogenetic clustering regulated by deterministic processes, especially environmental filtering, such as climate or habitat factors, along the two transects, although herbaceous plants along a transect depicted phylogenetic randomness as a result of a neutral process. Our findings suggest that deterministic and neutral processes may simultaneously control the community structures along small-scale elevational gradients such as local transects, although the deterministic process may be the predominant type.

生鲜农产品供应链关系契约稳定性影响研究——以冷链设施补贴模式为视角

基于我国当前生鲜农产品供应链中产品价格、盟员关系不稳定,农户和消费者利益受损的现实,本文通过构建两种供应链组织模式下的利润模型,研究了关系契约对农产品生鲜度及供应链利润的影响,并探讨了其"自我执行"机制;分析不同组织模式下冷链设施补贴模式对关系契约稳定性的影响。研究表明,关系契约在提升农产品生鲜度及供应链利润方面有显著作用,但不能完全保证契约的稳定性;引入冷链设施虽在进一步提高生鲜度及利润方面有明显作用,但不同引入方式对关系契约稳定性影响较大,而选择恰当的冷链设施补贴模式("公司+合作社+农户"组织模式下政府对农业合作社的补贴)可提升农产品生鲜度及农户盈利水平,最终提升生鲜农产品供应链关系契约的稳定性。