“益培灵”的抑菌效果及对大花蕙兰类原球茎增殖与分化的影响

将被萎蔫短小杆菌污染的大花蕙兰的类原球茎置于MS培养基中,以添加不同浓度、不同处理方法的"益培灵"杀菌剂进行正交实验,并观察类原球茎的平均增殖倍数及芽与根的生长分化情况。结果表明:"益培灵"对培养后期的萎蔫短小杆菌基本无抑菌效果。由于污染程度有差异,引起类原球茎平均增殖倍数、芽与根的生长数及分化率的差异。以培养基中添加0.05g/L"益培灵"和消毒液浸泡6min组合的类原球茎增殖倍数高,芽和根的生长数多,分化率高。     

Relationships between students’ demographic characteristics,perceived naturalness and patterns of use associated with campus green space,and self-rated restoration and health

There is increasing awareness of the benefits of campus green space in promoting student's health. However, information on how campus green spaces benefit students’ health is insufficient or limited to guide the planning or management process. As a result, the present study collected 897 valid responses to examine the differences in campus green space usage patterns among students with varying individual characteristics and to assess the interrelationships between students’ socio-demographic characteristics, perceived naturalness, patterns of use, and self-rated restoration and health using a structural equation model. The findings indicated that there were gender disparities in the presence of companions and frequency of use of campus green space, as well as discipline differences in companion presence. Additionally, gender, age, and discipline had distinct associations with perceived naturalness, patterns of use and self-rated restoration and health. Perceived naturalness positively contribute to patterns of use and self-rated restoration and health, while the frequency of use positively contributed to self-rated restoration and health. Moreover, students’ perceived health can be improved in part through the mediating effect of the self-rated restoration. The study findings demonstrated how campus green spaces benefit students’ health and provided valuable information for campus green space managers and designers. Therefore, we propose that presenting diverse natural elements, manipulating them in natural forms, providing feelings of wildness or friendliness, and eatablishing vast, high-quality, and diverse green spaces to promote students’ health.     

水涝胁迫对豫楸1号嫁接苗MDA和质膜透性的影响

通过对水涝胁迫条件下豫楸1号4种砧木嫁接苗MDA和质膜透性的测定,结果表明：在整个涝渍胁迫期间,豫楸1号4种砧木嫁接苗的质膜透性和MDA含量均呈上升趋势。I号与II号间的MDA差异达到显著水平（p〈0.05）     

铁皮石斛新品种‘青谷1号’的选育

从云南多地收集的16份野生铁皮石斛材料中筛选出表现较好的1份材料,再通过自交在后代中筛选出优良单株,经过组培扩繁后种植3 a,对该品系的特异性、一致性和稳定性进行评价。结果表明:该品系的8个外观性状、4个数量性状和1个质量性状都有较高的特异性,其多糖含量高达47.65%,且该品系单株和群体的一致性和稳定性都较高。之后,该品系被命名为‘青谷1号’,于2013年通过云南省林业厅园艺植物新品种注册登记办公室的认定。     

Study on the Lime Shape in the Essential System of Activated FA with Water Reducer

This paper studies the lime shape in the essential system of activated FA with water reducer.It shows that the water reducer has passive influence on activation of FA when lime is unslaked,and it will have positive influence when lime is slaked.A primary analysis has been done.     

延安市近60年气温与降水趋势突变分析

利用延安市1951～2008年的气温和降水资料,采用Mann-Kendall方法对延安市近60年的平均气温、平均最高、最低气温和降水量的变化序列进行了突变分析。结果表明:延安市年平均气温、年平均最高、最低气温均呈上升趋势,年降水量的变化呈下降趋势,延安市年平均气温与年降水量的突变点均出现在1990年,平均最高、最低气温的突变时间为1997年与1987年。60年间,延安市气候变化的总趋势为暖干化。     

元素硫的氧化及其添加污水污泥的利用前景

将污水污泥和元素硫以不同的比率混合， 为了控制混合物的ｐ Ｈ， 分别加入石灰（ Ｌｉｍ ｅ） 和磷矿石 （ｒｅｃｋ－ Ｐｈｏｓｐｈａｔｅ）。在一定的温度 （３０℃） 和湿度 （９０％ ） 条件下进行培养， 经过９ 周的培养证明， 混合物中污水污泥的含量增加， 元素硫的氧化率增加； 碱性环境有利于混合物中元素硫的氧化； 磷矿石对提高混合物中元素硫的氧化率无效。石灰能促进元素硫的氧化， 加入石灰使元素硫的氧化率从０９８％ 增加到３１１３％ 。从而提高混合物做为一种硫肥的肥料价值。     

淮北砂姜黑土区地下水调控措施探讨

本文分析了淮北砂姜黑土的“四水”特点及不同目的要求的地下水埋深。经过试验及调查分析,探讨了适宜本区特点的地下水调控措施     

Internal browning disorder and fruit quality in modified atmosphere packaged ‘Bartlett’ pears during storage and transit

Internal browning (IB) can be a serious problem with the use of modified atmosphere packaging (MAP) for ‘Bartlett’ pears (Pyrus communis L.) grown in the Pacific Northwest during storage and transit to distant markets. To investigate this disorder, ‘Bartlett’ pears harvested at commercial maturity were packed in a commercial MAP (MAPc), an experimental MAP (MAPe) and commercial perforated plastic bags (control) and stored in air at −1.1 °C. After 1 and 3 months of storage, samples of MAPc and control fruit were transferred to rooms at temperatures of 2, 4.5, 7.5, and 10 °C for 3 weeks to simulate transit temperatures and the time required to reach distant markets. MAPc maintained an average internal atmosphere of 12.3% O₂ + 5.6% CO₂ and significantly extended ‘Bartlett’ pear storage life with high eating quality and without IB and other disorders for up to 4 months at −1.1 °C. The internal gas atmosphere of MAPe equilibrated at 2.2% O₂ + 5.7% CO₂, which resulted in fruit with 25.5 and 62.3% IB after 3 and 4 months of storage, respectively. During simulated transit conditions of 2, 4.5, 7.5, and 10 °C, the CO₂ level in MAPc was maintained at 5.6–7.9%, while O₂ was reduced dramatically to 10.5, 5.0, 2.5, and 1.0%, respectively. IB developed at 7.5 and 10 °C but not at 2 and 4.5 °C, regardless of pre-transit storage duration (1 and 3 months) at −1.1 °C. The longer the storage duration and the higher transit temperature, the higher the incidence and severity of IB. The MAP-related IB disorder observed in this study included two types of symptoms: classic pithy brown core and wet brown flesh. The MAPc storage gas atmospheres maintained fruit firmness, color and higher eating quality after ripening, eliminated senescent scald and core breakdown, suppressed the loss of ascorbic acid (AsA) and titratable acidity, and slowed the accumulation of malondialdehyde (MDA) during storage at −1.1 °C for up to 4 months or 3 months + 3 weeks at simulated transit temperatures of 2 and 4.5 °C. In contrast, fruit held in MAP with low O₂ levels (1.0–2.5%) developed IB that appeared to be associated with a reduction in AsA, accumulated MDA and exhibited an increase in membrane leakage. MAP inhibited ripening at high CO₂ + high O₂ but lead to IB when the packaging material or elevated temperatures resulted in high CO₂ + low O₂ conditions. The incidence of IB closely correlated with lipid peroxidation and appeared to be related to fruit AsA concentration. The MAPc designed for pears appears to be suitable for ‘Bartlett’ fruit stored at −1.1 °C for up to 4 months or storage for 3 months and a transportation duration of up to 3 weeks at 0–4.5 °C during the early season and at 0–2 °C during the late packing season. These conditions yielded fruit of high eating quality and without IB or over-ripening upon arrival at distant markets.