我国集体林区林业规模经营的现实分析与实现路径

林业规模经营是我国实现林业现代化发展的一个必要过程。新一轮集体林权制度改革既为发展林业规模经营带来了挑战,但同时也为其创造了必要的条件。文中通过对规模经营相关理论的分析,对我国集体林区发展林业规模经营的现实必要性以及阻碍其发展的制约因素进行探讨,并就其实现路径提出如下建议:创新林地流转机制、培育新型林业规模经营主体、逐步建立健全林业社会化服务体系、把握好林业规模经营的\"度\",以期为我国林业向规模化、集约化和现代化方向发展提供参考。     

乌兹别克斯坦林业发展现状

乌兹别克斯坦是新丝绸之路经济带上的重要国度, 了解乌兹别克斯坦林业发展动态对于加快中乌林业合作、推动中国林业可持续发展有着重要意义。文中介绍乌兹别克斯坦森林资源、林业法规政策、林业机构、森林经营、林产品生产贸易和林业科研教育等现状, 在此基础上总结乌兹别克斯坦林业发展的主要特点和问题, 展望中国与乌兹别克斯坦林业合作的良好前景。     

中国省际粮食贸易碳转移空间格局及其责任分担

开展省域尺度粮食贸易碳转移空间格局及其责任分担研究,对于合理划分碳减排责任、探索面向粮食安全的省际协同碳减排策略具有重要现实意义。该研究采用2020年中国31个省级行政区截面数据,基于粮食贸易线性规划方法和粮食贸易碳排放量计算模型对省际粮食贸易及其碳排放进行了核算,并揭示了其空间转移格局;采用粮食贸易碳排放量责任分担计算方法探讨了各省份粮食贸易碳排放责任分布特征。结果表明：1）在省际粮食贸易与粮食贸易碳排放格局中,输出区主要为东北、华北、西北和华中地区,输入区主要为西南、华南和华东地区。2020年全国粮食贸易总量为1.53 亿t,输出区中东北地区累计向外输送7 126.54万t,占贸易总量的46.7%,华北地区累计向外输送2 617.38万t,占贸易总量的17.1%,西北地区累计向外输送455.51万t,占贸易总量的3.0%,华中地区累计向外输送5 069.71万t,占贸易总量的33.2%;2）粮食贸易碳排放在空间上呈现出     

不同光照处理下外施营养液和激素对万圣节法师叶色变化的影响[1]

To study the effects of light, external nutrition, and hormones on the color changes of Aeonium aeonium \"Halloween\" leaves. In this study, the 1-year-old stem cuttings of the Aeonium aeonium \"Halloween\" were used as materials. The leaves were sprayed with 25mg/L methyl jasmonic acid, 3‰ potassium dihydrogen phosphate, and 1‰ calcium magnesium boron mixture for two consecutive times, with an interval of 3 days. The experiment consisted of CK (water control), LS, DS (dark culture for 1 week). After 1 week of treatment, the leaf color parameters and anthocyanin pigment content were measured every 7 days for 6 consecutive weeks. The results showed that the treatment time and method had a significant impact on the leaf color parameters. In terms of brightness value L, as the treatment time extended, all three treatments showed an upward downward upward trend. Among them, the highest value was reached after 2 weeks of treatment, gradually decreased after 3 weeks, and sharply increased again after 6 weeks; In terms of red green saturation a value, after 2-4 weeks of treatment, both LS and DS treatments were significantly higher than CK, and the effect significantly decreased after 5 weeks; Light has a significant impact on a value, with DS treatment showing a significant decrease in a value after one week of shading, and a sharp increase after re lighting; In terms of the b value of yellow and blue saturation, the change in CK value is relatively small with the extension of treatment time, while the fluctuation in LS and DS treatment is significant; In terms of color saturation c value, DS treatment significantly increased with the prolongation of treatment time, and there was no significant change in LS and CK treatment within 1-3 weeks. After 3 weeks of treatment, there was no significant difference between the three treatments; With the extension of treatment time, the anthocyanin content of each treatment showed a trend of first increasing and then decreasing. After 2-3 weeks of treatment, the anthocyanin content was higher, and gradually decreased after 4 weeks of treatment; Correlation analysis shows that anthocyanin content is highly significantly positively correlated with a and c values, and anthocyanin content is a key factor in the red color of Aeonium aeonium \"Halloween\".     

猪腺病毒3型TaqMan探针荧光定量PCR检测方法建立

猪腺病毒3型(PAdV-3)导致猪肠道性疾病。为能够快速特异检测该病毒,本研究根据PAdV-3 hexon基因序列保守区设计特异性引物和探针,成功建立了一种针对PAdV-3的TaqMan探针实时荧光定量PCR(qPCR)检测方法。结果显示：该方法特异性好,可鉴别PAdV-3与其他猪病病毒,最低检测限为10 copies/μL,敏感性高于常规PCR 100倍。该检测方法的建立为PAdV-3的快速诊断提供了重要的分子诊断工具。     

基于产业链理论的生态产品价值实现增值机理与推进路径探析

生态产品价值实现是经济社会发展全面绿色转型的必然要求和重要着力点。借助产业链理论,文中将生态产品价值实现过程解析为涵盖投入、生产、加工、流通、营销和服务6大核心环节的全产业链过程;以此为基础,结合各地实践案例,探究产品、服务、信息化平台、特色品牌和环节衔接等生态产品产业链增值途径,搭建以深层生态为增值本底、核心环节为增值基础、内外驱动为增值动力、资源配置为增值约束、目标协同为增值保障的增值内在逻辑框架;最后,从全空间谋划、全要素驱动、多主体参与的系统性角度提出生态产品价值实现的推进路径。     

大豆抗孢囊线虫4号生理小种新品种的选育研究

 从 1991年开始进行大豆抗孢囊线虫 (HeteroderaglycinesIchinohe)的育种研究 ,并利用一些抗源 (P14 376 5 4、灰皮支黑豆等 )进行了大量杂交工作 ,通过连续单株选拔、加大抗性好的组合群体数量、南繁北育、早代鉴定等措施 ,筛选出一些高抗、中抗的品种和品系 ,如中黄 12 (中作 5 2 39)、中黄 13(中作 975 )及中黄 17(中作 976 )等品种己正式审定推广 ,后两个品种己通过国家审定 ;有一批品系正在参加国家和省的大豆区域试验。这些品种和品系将对推动大豆生产起一定作用。     

淡竹开花生物学特性

以淡竹(Phyllostachys glauca Mc Clure)为研究材料,对花期物候、花序形态结构等进行研究。结果显示:淡竹为续次发生花序,盛花期为4月30日至6月5日,开花时顶部花先开,内、外稃不张开,果实为颖果;淡竹花序由小穗组成,每一小穗仅含1朵小花;小花具内、外稃各1枚,浆片3枚,雄蕊3枚,雌蕊1枚,柱头为长花柱型。雌雄同熟。     

腌肉习俗在农村地区的合理性研究

随着科学技术的发展和医学知识的不断完善,以腌肉、腌菜为代表的腌制品的健康性受到了质疑.然而,每到腊月底的时候,我国大部分农村地区都有门前挂腌肉的景象.腌肉何以在农村长期存在,其背后的合理性因素值得研究和探讨.     

蛹虫草的研究和产品开发进展

综述了蛹虫草的驯化、药理研究及产品开发等方面的研究进展。