不同类型有机肥对烤烟石油醚提取物及香气物质含量的影响

采用田间试验方法,研究不同类型有机肥对石油醚提取物及香气物质含量的影响。结果表明:1)施用有机肥均能增加石油醚提取物含量,其中T3(无机化肥+芝麻饼肥+生物有机肥)处理的中、上部叶石油醚提取物含量最大,分别为7.76%、8.75%;2)施用有机肥处理对上部叶的增香效果优于中部叶,有机肥处理的上部叶有24种香气物质含量均高于CK,中部叶有18种高于CK;其中T3处理的中、上部叶致香物质总量最大,分别高达1 291.45、1 524.34μg/g,较CK处理分别增加3.32%、34.86%。     

河南周口市粮食生产核心区建设面临的问题与建议

周口市作为河南省粮食生产大市,粮食核心区建设在全省乃至全国占据重要地位。分析了周口市目前核心区建设现状、遇到的瓶颈,对下一步的工作提出了建议,以期为粮食生产核心区建设提供理论参考。     

绿肥对于麦田硝酸氮含量之影响

华北土壤普遍缺乏氮肥及有机质。豆科绿肥为补充土壤氮素及有机质方法之一。但华北旱田鲜有实行绿肥者。同时中央农业实验所在陕西关中区举行之绿肥肥料试验及绿肥示范,其结果并未充分表现绿肥之效能,有时绿肥完全无效,有时绿肥尚能增加作物之产量,但其增加之产量远逊于南方绿肥之效果。华北绿肥效果不大之原因何在,颇值研究。中央农业实验所北平农事试验场于民国卅五年至卅六年间曾举行小麦绿肥试验,于卅元年夏播种绿豆,八月下旬压青,十月初播种小麦。于绿肥压青前后及小麦生长期间,定期测定土壤水分及硝酸氮含量,比较夏闲区与绿肥压青区之硝酸氮含量,研究绿肥压青对于硝酸氮含量之影响。兹将所得结果略述于后。     

高温胁迫对无柄小叶榕光合作用的影响

以无柄小叶榕为材料,研究了不同时间高温处理对无柄小叶榕气体交换参数、叶绿素荧光参数和Rubisco活力的影响.结果表明,随着高温处理的持续,净光合速率(Pn)持续下降,而气孔导度(Gs)下降非常缓慢,蒸腾速率(Tr)则先开始快速上升随后保持稳定,但是胞间CO2浓度(Ci)却没有明显变化.进一步研究发现,在高温胁迫下,开放PSII反应中心激发能捕获效率(Fv''/Fm'')、光化学猝灭(gP)、PSⅡ实际量子产额(Φ<,PSⅡ>)和电子传递速率(ETR)都持续下降.Rubisco初始活力下降速度则快于这些荧光参数的变化.非光化学猝灭(NPQ)14是先迅速上升后来略有下降.这些结果表明高温抑制无柄小叶榕的光合作用不是由于气孔因素引起的,而是由于高温抑制了Rubisco活力,进而影响PSⅡ活力和电子传递.     

探索“中国风”——谈中国插花艺术的传承与创新

中国传统插花艺术源远流长,因其具备端庄典雅的造型、富有诗意的画面、形神兼备的意境、师法自然的手法等特点而备受推崇和青睐。随着时代的发展,中国现代插花艺术该如何传承与创新,文章试从中国传统插花艺术的风格与特点出发,探讨现代插花艺术设计中的"中国风"。     

发菜生存与生长分布的微生态环境

通过野外调查 ,研究和分析了对发菜生存与生长发育起直接作用的微土壤、微气候、微地形、微植被和风向等微生态环境。发菜对生存环境的选择性很强。其中 ,干一湿交替的微气候环境是一个起决定作用的关键性因子 ,是发菜生存和生长发育的必要条件。一方面 ,发菜藻体在干燥的状态下 ,有利于干物质的积累 ,是发菜生存和生长的必要前提 ;另一方面 ,发菜藻体只有在一定湿润状态下 ,才能生长发育。由于干旱气候环境所限 ,野生发菜的生长速度极为缓慢。     

Analysis on the effect of runoff retention and pollution load control for two vegetation roofs during rainfall events

In order to understand the effect of runoff retention and pollution load control for vegetation roofs during rainfall events, the evaluation criterion of vegetation roof performance is redefined and two vegetation roofs are established artificially based on the code for the design of roof greening, which is investigated during rainfall events. Results show that ophiopogon japonicus roof can delay the production of runoff by 25〖XC半字线.tif,JZ〗48 min compared to the rain occurring and retention runoff volume by 40%〖XC半字线.tif,JZ〗58%, while sambucus dhinensis roof can make the generation of runoff 60〖XC半字线.tif,JZ〗130 min later than the rain beginning and runoff volume retention can be as high as 54%〖XC半字线.tif,JZ〗80%. In addition to PO 3-4 P, the reduction of pollution load of NO -2 N, NH3 N, TP, COD, TN and NO -3 N by both vegetation roofs can reach 95.1%〖XC半字线.tif,JZ〗98.6%, 87.2%〖XC半字线.tif,JZ〗93%, 72.4%〖XC半字线.tif,JZ〗83%, 76%〖XC半字线.tif,JZ〗81.8%, 68.7%〖XC半字线.tif,JZ〗78.4% and 40.9%〖XC半字线.tif,JZ〗60.6% respectively. The level of pH, COD, NH3 N and TP in vegetation roofs runoff can meet class Ⅲ surface water standard. Meanwhile, both vegetation roofs have similar effect in neutralization acid deposition (i.e., from 5.8〖XC半字线.tif,JZ〗6.0 (in rain water) to 7.0〖XC半字线.tif,JZ〗7.6 (in eco roof runoff water)). Plants grown on vegetation roofs can influence the performance of vegetation roofs. Based on the results, ophiopogon japonicus has an advantage of sambucus chinensis in controlling phosphorus pollution, while sambucus chinensis manifests better in reducing nitrogen load. Vegetation roofs are becoming an important urban landscape more and more, and study results in this paper provide references for the improvement of vegetation roofs construction and more reasonable evaluation of their running performance.     

Can sieving size affect the determination of soil available micronutrients?

<正>Dear Editor,Globally, approximately two billion people suffer from micronutrient deficiencies(Tulchinsky, 2010; Myers et al.,2014).Soil micronutrient availability is of great importance for the evaluation of soil fertility and the determination of appropriate measures for improving crop quality and human health.The diethylenetriamine-penta-acetic(DTPA)     

玉米群体辐射传输特征

实验观测分析了玉米群体总辐射的透过率、截获率、反射率和消光系数,结果表明玉米群体总辐射透过率、反射率和消光系数具有明显日变化特征;玉米雄穗开花前后其群体透过率和截获率有明显变化;日际反射率随玉米生育期而异,初期达0.23,之后逐渐下降至0.14左右;生育期平均反射率约为0.19;总辐射和净辐射的消光系数分别为0.51和0.41。提出了总体消光系数的概念,该系数在观测期较稳定,约为0.26,依此利用入射总辐射可算出作物群体冠层辐射截获量。     

Function and relationship between c-Jun N-terminal kinase and caspase in apoptosis

Apoptosis is important to the development of diseases.Research recently indicates that c-Jun N-terminal kinase (JNK) and cysteinyl aspartate-specific protease (caspase) play key roles in apoptosis and affect the development of diseases.This article is to introduce the function and relationship between JNK and caspase in apoptosis during the process of diseases.