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银杏中抗病原真菌的内生真菌的分离筛选 总被引:4,自引:0,他引:4
从银杏的根、茎、叶中分离到66株内生真菌,研究结果表明,内生真菌数量与银杏树龄有关,树龄越高,其含有的内生真菌数量越多。抑菌试验测定结果表明,29株银杏内生真菌代谢产物对农作物病原真菌具有一定的抑制作用,表明银杏中存在农用活性菌株。 相似文献
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Shoujia Sun Runze Gu Richen Cong Shaochen Che Junping Gao 《Frontiers of Forestry in China》2007,2(3):316-322
For this paper, GREENSPAN sap flow system was used to monitor the dynamics of trunk sap flow of Gingkgo biloba. Results indicate that sap flow velocity is significantly different among different heights, depths, and directions of the
trunk. Sap flow velocity at the upper position of the trunk is higher than that of the middle and lower position, but cumulative
flux is not significantly different among the upper, middle and lower sections. Sap flow velocity at 10 mm reached the most
and that at 20 mm the least. However, sap flow velocity at 5 mm and 15 mm was similar and was second among the four depths.
Results also showed that sap flow velocity of the south was the highest, and that of the west was next. An Automatic Weather
Station of HOBO was synchronously applied to measure these meteorological parameters, and the relationship between these parameters
and the changes of trunk sap flow velocity were analyzed. We found that the change of sap flow velocity was a single-crest
curve on clear days and multi-crest curve on cloudy and rainy days. In addition, it is also revealed that by stepwise regression
analyses photosynthetical active radiation (PAR), temperature and wind speed are the main environmental factors affecting
sap flow velocity. The efficient methods of reducing water transpiration of trees, including leaf pruning, overshadowing and
antitranspirant spraying, were found by investigating the effects on inhibiting transpiration, which indicated that spraying
of antitranspirants, leaf pruning and overshadowing could significantly reduce transpiration but the effects of leaf pruning
and overshadowing were far better than that of antitranspirant spraying.
Translated from Scientia Silvae Sinicae, 2006, 42(5): 22–28 [译自: 林业科学] 相似文献
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为了动态地掌握银杏的蒸腾耗水规律,并揭示其生态、生理作用机理,采用热扩散式液流探针(TDP)监测银杏树体不同生长阶段的茎流变化,并通过气象站同步测定环境因子参数。结果表明:在典型的晴天、多云、阴雨天气下,银杏树干茎流的日变化差异显著,日累积茎流通量为晴天>多云天气>阴雨天气;银杏茎流的季节变化趋势呈现为先上升后下降的态势,在新梢生长期的蒸腾耗水量最大,日耗水量可达23L左右。在叶速生期、新梢生长期和叶黄期银杏日蒸腾耗水量的波动明显,其中以新梢生长期最为显著,日间差异最大可达20L。以各阶段日均耗水量来估算,12年生银杏年耗水量大约为2580L;银杏在年生长周期中茎流通量的变化趋势与气温、土壤湿度、土壤温度、相对湿度、光合有效辐射以及降雨量的季节变化趋势基本一致,逐步回归分析表明银杏年生长周期中大气温度是茎流最为主要的影响因子,回归方程达到极显著水平。 相似文献
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银杏内生真菌的分离及其抑菌活性初探 总被引:2,自引:0,他引:2
从银杏的茎和根中分离得到32株内生真菌,并对其发酵液和菌丝丙酮提取物的抑菌活性进行了测定。结果表明:筛选出1株对4种供试菌均有强烈抑菌作用的菌株,命名为L25菌株,其抑菌活性成分在90℃以下和对紫外线稳定。 相似文献
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银杏树体茎流变化及其对环境因子的响应 总被引:2,自引:1,他引:2
为了动态地掌握银杏的蒸腾耗水规律,并揭示其生态、生理作用机理,采用热扩散式液流探针(TDP)监测银杏树体不同生长阶段的茎流变化,并通过气象站同步测定环境因子参数。结果表明:在典型的晴天、多云、阴雨天气下,银杏树干茎流的日变化差异显著,日累积茎流通量为晴天>多云天气>阴雨天气;银杏茎流的季节变化趋势呈现为先上升后下降的态势,在新梢生长期的蒸腾耗水量最大,日耗水量可达23L左右。在叶速生期、新梢生长期和叶黄期银杏日蒸腾耗水量的波动明显,其中以新梢生长期最为显著,日间差异最大可达20L。以各阶段日均耗水量来估算,12年生银杏年耗水量大约为2580L;银杏在年生长周期中茎流通量的变化趋势与气温、土壤湿度、土壤温度、相对湿度、光合有效辐射以及降雨量的季节变化趋势基本一致,逐步回归分析表明银杏年生长周期中大气温度是茎流最为主要的影响因子,回归方程达到极显著水平。 相似文献
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