Soil CO2 evolution from Korean pine virgin forest at Changbai Mountain     

Ma Yueqiang  Yan Xiaodong  Yang Sihe 《林业研究》1998,9(3):192-194

The soil CO₂ evolution rate was measured in a virgin Korean pine forest. The results in June showed that the lowest value of evolution rate was 220 mg/(m²·h) and appeared at 6:00 a.m. The highest value was 460 mg/(m²·h) at 18:00. The rates of CO₂ evolution were related with soil temperature. On the basis of the constructed regression equation and the monthly average values of temperature, the magnitude of CO₂ evolution from Korean pine forest soil was 10.4 t/hm² during a growing season. This project was funded by the Opened Research Station of Changbai Mountain Forest Ecosystem, Chinese Academy of Sciences. Responsible editor: Zhu Hong  相似文献   

近期国内外食糖市场分析与展望     

马光霞 《农业展望》2008,4(6):25-28

对近期国内外糖料及食糖市场产销基本情况作了较为详细的分析，同时反映了中国主要含糖食品产量增长情况。主要对近期国内外食糖市场供求情况、价格走势进行了客观的判断分析，对国内外食糖价格走势进行了对比，分析了中国食糖市场的宏观调控。  相似文献   

不同脱水方式对马拉巴栗种子脱水敏感性和膜脂过氧化的影响   总被引：3，自引：0，他引：3  

李永红  马颖敏 《热带作物学报》2008,29(6):738-743

研究在不同脱水速率下，马拉巴栗种子的脱水敏感性与膜脂过氧化的关系。结果表明，在脱水过程中，种子的萌发率、活力指数、出苗率逐渐下降，相对电导率、膜脂过氧化产物MAD含量、POD活性逐渐上升，SOD活性、种子内源ABA含量在脱水初期增加，然后下降。比较3种脱水速率对种子生活力的影响发现，经硅胶脱水后的种子表现出脱水敏感性较低，其次是KNO3脱水和NaCl脱水。因此，快速脱水有利于改善马拉巴栗种子的贮藏寿命。  相似文献   

The effect ofDendrolimus superans breakout on growth of trees     

Ma Dongmei  Qin Shili  Song Chunbin  Lu Kuicheng  Zhang Baohong  Liu Jiming 《林业研究》1998,9(4):269-272

The effect ofDendrolimus superans on growth of trees was investigated after the breakout in Shibazhan forest area in 1990. Stem analysis was conducted for determining the tree increment loss. The result showed that the current annual increment for extreme heavily damaged, heavily damaged, moderately damaged and lightly damaged stands is 14%, 39.8%, 64% and 82% of that of the control forest respectively. (Responsible Editor: Chai Ruihai)  相似文献   

大力推广方格蔟,提高蚕茧质量   总被引：1，自引：0，他引：1  

马秀康  陈国勋 《蚕桑通报》1999,30(1):5-8

本文在总结湖州雠主格蔟成绩的基础上，针对当前在方格蔟推广上存在的问题，提出了大力推广方格蔟，提高茧质的建议。  相似文献   

水杉人工林抚育间伐的效果比较     

周林  傅先义 《江苏林业科技》1998,25(4):12-15

在１５ａ生水杉人工林内设立标准地，定量机械间伐，定期测定生长量，对抚育间伐７ａ后的效果及经济效益进行分析，结果表明：（１）不同初植密度的林分采用较小的强度ｐｎ＝２５％，３３％进行间伐，与对照林分相比，平均每公顷生长量分别提高５．９７，９．２７ｍ３，增加９．５７％，１４．８７％；采用较大强度ｐｎ＝５０％进行间伐，与对照林分相比，平均每公顷生长量下降９．７ｍ３，减少１５．５７％。（２）抚育间伐过的林分（间伐强度ｐｎ＝２５％，３３％，５０％）与对照林分相比，单位面积保留木平均生长率分别提高１．３４％，２．００％，１．９７％。（３）抚育间伐的林分与对照林分相比，平均每公顷总产值和利润分别增加６２７８，５７８４元，增长７．７％，９．５％。  相似文献   

Different genes can be responsible for crown rot resistance at different developmental stages of wheat and barley     

Xueming Yang  Jun Ma  Haobing Li  Hongxiang Ma  Jinbao Yao  Chunji Liu 《European journal of plant pathology / European Foundation for Plant Pathology》2010,128(4):495-502

Crown rot, caused by several Fusarium species, is one of the most damaging diseases in wheat and barley. Growing resistant varieties has long been recognised as an integral part in effectively managing the disease. One of the factors hindering the progress of breeding for crown rot resistance is the lack of a reliable and high throughput bioassay that allows rapid and accurate assessment of large numbers of genotypes so that highly susceptible materials can be quickly rejected and potentially resistant lines identified for more focused further assessments. We developed a method which, by growing several inoculated seedlings wrapped in a single piece of moist paper towel, offers significant advantages over all of the existing methods. The new soil-less assay takes only about two weeks, requires very little space, and removes variability associated with the use of soil/potting mixes. Results from the new assay are highly reproducible and agree well with known field performances of different varieties. However, mapping studies conducted using the new soil-less assay did not detect all of the quantitative trait loci found with a soil-based assay. These results show that, although different resistance genes may all contribute to the performance of a variety, caution should be used when comparing results from different assays.  相似文献   

3种熏蒸剂对椰心叶甲的熏蒸效果及寄主切叶的影响   总被引：1，自引：0，他引：1  

李朝绪  覃伟权  马子龙  彭正强  黄山春 《热带作物学报》2009,30(12):1847-1851

分别利用磷化钙、3%高效氯氰菊酯烟雾剂(烟魁)和溴甲烷3种熏蒸剂熏蒸处理椰心叶甲[Brontispalongissima(Gestro)]各虫态及散尾葵切叶,观察椰心叶甲各虫态的死亡情况和对散尾葵叶片的影响.结果表明:烟魁使用时灼伤散尾葵切叶,不适合处理散尾葵切叶.其他2种熏蒸剂对切叶没有明显影响,影响熏蒸剂对椰心叶甲各虫态致死的主要因素是熏蒸剂的浓度和熏蒸时间.磷化钙处理而言,其分解为磷化氢气体需要时间,需要熏蒸24 h,使用0.3 mg/m~3即可达到完全杀死椰心叶甲的目的;而对于溴甲烷处理而言,用量相对较大,但熏蒸时间较短,20g/m~3的浓度2 h才可以满足生产上对椰心叶甲除害的需要.研究结果对处理棕榈植物鲜切叶或苗木有重要的借鉴意义.  相似文献   

不同药剂对小麦种子萌发及根芽生长的影响   总被引：1，自引：1，他引：0  

郭秀林  杨国立  马春红  崔四平 《河北农业科学》1998,2(4):38-40

由于干旱或种子发芽率不高,种植作物时经常出现缺苗断垄等情况.保证作物苗全苗壮是争取高产高效的前提条件.采用化学药剂在播前浸种或拌种是目前农业生产上常见的保苗方法之一.本试验旨在筛选促进种子萌发和根芽生长的有效药剂.  相似文献   

钴离子(Co~(2 ))对月季鲜切花生理结构的影响     

张静  马国瑞 《浙江大学学报(农业与生命科学版)》1998,(6)

在实验室常温条件下，将月季（ＲｏｓａＣｈｉｎｅｓｅｓｊａｃｑ．）鲜切花品种“萨蒙莎”置于２％蔗糖和不同浓度ＣｏＣｌ２溶液进行瓶插培养．在有蔗糖提供营养的基础上，Ｃｏ２＋可以延缓细胞膜差别透性的降低，抑制月季茎切口端和培养液微生物特别是真菌的生长，并能维持茎中央薄壁细胞和花瓣表面乳突状细胞的完整性，减少“弯颈”现象的发生．  相似文献