棉花冠层叶面积的动态模拟

根据试验资料,在系统分析棉花冠层叶面积时空分布规律的基础上,充分考虑叶面积空间垂直分布的异质性,以生育期内累积的每日相对热效应为预报因子,构建了棉花叶面积垂直分布和叶面积指数的动态模拟模型。利用不同年份不同播期的试验资料对模型进行了验证,累积叶面积指数L（z）的模拟结果与1∶1直线之间的R^2和均方根误差分别为0.969和0.257,叶面积指数LAI的模拟结果与1∶1直线之间的R^2和均方根误差分别为0.936和0.305。结果说明模型具有较好的预测性和实用性。模型的模拟结果可作为冠层结构参数,用于冠层辐射传输模型和光合作用模型。     

桃新品种‘秋露蜜’的选育

‘秋露蜜’是从‘国庆’桃实生后代中选出的浓甜晚熟桃新品种。平均单果重248.3 g,果面鲜红,果肉乳白色,甘甜,品质上等,平均硬度达15.30kg/cm²,可溶性固形物含量19.08%。在晋南地区,果实9月上中旬成熟,果实发育期162 d左右。离核。     

虚拟现实技术在多媒体课件开发中的应用

目前虚拟现实技术在高校教学多媒体课件开发过程中应用较为广泛,在分析虚拟现实技术及其在课件开发中的应用优势的基础上,针对虚拟现实技术在多媒体课件开发中的具体应用展开了相关论述,以期实现更深层次发展。     

大兴安岭火烧迹地主要目的树种的天然更新

对不同火烧方式、火烧强度、林分组成、坡向、坡位、郁闭度、土壤厚度、下木盖度、地被物盖度、林龄等条件下的样地的天然更新情况进行了调查。结果表明:地表火火烧迹地的天然更新效果好于树冠火火烧迹地;中度火烧迹地好于重度火烧迹地;发生火烧的林分比未发生火烧的林分天然更新效果好。     

玉米新品种抗旱性品比试验

玉米是毕节地区最重要的粮食作物,年均播种面积占粮食总播种面积的35%,产量占粮食总产的40%以上,玉米的丰欠在全区粮食总产中起着举足轻重的作用。近年来,随着科技兴农进程的推进,杂交品种及其配套技术得到广泛的应用,玉米产量不断提高。但在一些地区历年春、伏旱极为严重,人畜     

Cellular Localization of Rice SUMO/SUMO Conjugates and in vitro Sumoylation Using Rice Components

正Many proteins are regulated by post-translational modifications,such as the reversible covalent attachment of ubiquitin and ubiquitin-like proteins in eukaryotes(Kerscher et al, 2006). Post-translational modification of proteins by the SUMO protein family is involved in diverse cellular processes, including development, hormonal responses, and biotic and abiotic stress signaling(Park et al, 2011). SUMO modification can modulate protein-protein interactions, intracellular localization or the activities of the protein(Gareau and Lima, 2010).     

Evaluation on the fitness and population projection of Nilaparvata lugens in response to elevated CO2 using two-sex life table

Abstract

The life history and fitness of Nilaparvata lugens being reared under ambient level (current CO₂ concentration), medially elevated (550?µL/L) and highly elevated (750?µL/L) CO₂ concentration for long-term generation were compared using two-sex life table instead of traditional age-specific life table. The results showed that significantly longer larval duration and lower fecundity of N. lugens were observed in 750?µL/L relative to 550?µL/L treatment (P?<?0.05). Accordingly, 550?µL/L CO₂ significantly enhanced population parameters of N. lugens, including significantly higher intrinsic rate of increase (r), finite rate (λ) and net reproductive rate (R_O), but not for 750?µL/L CO₂. Taken together, N. lugens performs enhanced development rate, fecundity and survival in individual life history and higher potential in population multiplication under 550?µL/L CO₂ level, while only indicates the less enhanced development rate and survival without significant increased capacity of population expansion under 750?µL/L CO₂ level. These results should facilitate predicting the fitness and potential population damage of N. lugens, which is valuable for the integrated control of N. lugens in the future increasing CO₂ concentration.     

Streptomyces TOR3209介导盐碱地金花葵根际的生态效应

为研究植物微生物联合改良盐碱地的效果和根际效应,以耐盐植物金花葵(Hibiseu manihot L.)和根际益生菌链霉菌Streptomyces TOR3209为材料,采用磷脂脂肪酸(PLFAs)生物标记法和生物多样性指数测度法,在始蕾期和成熟期,检测了TOR3209+金花葵(T1)、金花葵(T2)和裸地原土(空白CK)根际微生物总量和主要菌群结构的变化,同时检测了根围土壤主要酶活性和理化性状的变化。结果表明:T2处理能显著提高土壤磷脂脂肪酸(Phospholipid-derived fatty acids, PLFA)含量和多样性,改善微生物群落结构,但G+/G-值高于CK,土壤却转向贫瘠。T1处理的金花葵生长旺盛,全株生物量提高了113.22%;在2个生长期,碱解氮、速效磷、速效钾含量也有显著提高,根围土壤电导率和pH值均下降;土壤蔗糖酶、脲酶和碱性磷酸酶活性均有所提高;微生物总量提高,土壤微生物Shannon多样性指数、Simpson优势度指数和Margalef丰富度指数显著改善,细菌、放线菌、细菌/真菌和AM真菌总量等提高;且G+/G-值低于CK,土壤由贫瘠转向丰富。T1处理土壤理化性质和生物学指标均更优于T2处理。冗余分析(RDA)表明,土壤微生物与碱解氮、速效磷、有机质呈正相关,与pH和电导率呈负相关,是影响根际微环境的重要因子。链霉菌TOR3209与根系互作,通过改善根际微环境,显著提高了植株的耐盐能力和生产性能。植物微生物联合改良盐碱地具有良好前景。