共查询到20条相似文献，搜索用时 234 毫秒
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本文主要是对森林虫生真菌的研究与应用进行介绍,分析了虫生真菌的作用,综合国内外的研究情况,就虫生真菌的致病机理及其毒力、菌株选育、制剂研究自然发生与流行规律、作为杀虫剂适用的引入定殖、流行病的诱发与调整等进行研究,主要对虫生真菌在福建省龙岩市永定区森林中的应用情况进行深入分析。 相似文献
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真菌多糖的免疫调节作用 总被引：24，自引：2，他引：22
真菌多糖是从真菌中分离出的由十个以上的单糖以糖甙键连接而成的高分子多聚物。真菌多糖通过对淋巴细胞、巨噬细胞、网状内皮系统等的作用而调节机体的免疫功能。本文概述了真菌多糖的免疫调节作用。1 香菇多糖 (Ｌｅｎｔｉｎａｎ ,ＬＴＮ) 是从香菇中分离到的具有 β - 1,6 相似文献
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以盆栽‘红地球’葡萄为试材,对筛选自甘肃莫高、陕西泾阳、陕西杨凌和山西永济等地葡萄园土壤中的3 株菌根真菌和5 株溶磷真菌促生能力进行考察,测定了目标菌株对‘红地球’葡萄株高、干质量、叶绿素含量、植株含磷量和土壤有效磷、蒸腾速率、气孔导度和净光合速率等11 个相关指标,利用SPSS 软件对这些促生效应指标进行相关分析和因子分析,并利用因子得分进行综合评价。提取4 个公因子作为新的综合指标来代替原来的11 个指标,并命名为：生物量因子（F1）、蒸腾作用因子（F2）、土壤有效磷因子（F3）和光合作用因子（F4）。其中生物量因子（F1）对原指标体系的方差贡献率最大,因此,F1 因子所包含的植株株高、植株干质量、含磷量及叶绿素含量是评价真菌促生效应最重要的生物量指标。综合分析结果得出,3 株菌根真菌的促生能力明显高于5 株溶磷真菌。而溶磷真菌中,MG-（1）的促生能力最高,其余真菌虽有一定的促生作用,但促生能力低于平均水平,其能力大小依次为YL-D >JY-B > YL-F > YJ-7。 相似文献
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口感好硒含量高采摘期长,这是海南省“澄迈福橙”的特点,澄迈县将福橙促销瞄准大超市。2009年2月20日,该县在省城海口市召开福橙品尝推介会,向超市促销这一地方名牌农产品。 相似文献
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Fatemeh Bakhtiari Jette Bredahl Jacobsen Frank Søndergaard Jensen 《Urban Forestry & Urban Greening》2014,13(4):662-671
Conflicts among forest visitors have direct effects on the quality of a recreational experience. As the number of visitors to forests close to residential areas increases, as well as the number of different activities, so does the potential for perceived conflicts. According to the literature, expanding knowledge of conflict characteristics and their causes is important for recreation planners and managers who aim to reduce conflicts.In the present study, different forest user groups were identified and categorised according to their pursued activities, and for each group, causes of conflict were identified. Furthermore, a choice experiment was constructed to estimate the distance visitors are willing to travel to encounter few visitors as opposed to many visitors, and thereby potentially experience fewer conflicts. Comparing the marginal willingness to travel (WTT) of different user groups suggests that some groups have a WTT further than the average to reach a forest with ‘Few’ visitors. The average WTT to reach a forest area with ‘Few’ visitors. ‘Mountain bikers,’ ‘Peace and nature lovers’ and ‘Horse riders’ are willing to travel 4 km more than the average per visit to reach a less crowded forest. At the other end of the scale, we find that people who are doing physical exercise are willing to travel 2 km less than the average to reach a less crowded forest. 相似文献
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桃砧木筑波4号和筑波5号抗根癌病鉴定评价 总被引：2，自引：0，他引：2
以当年实生筑波4号(Prunus persica‘tsukuba-4’)和筑波5号(Prunus persica‘tsuku-ba-5’)的新梢为材料,采用人工接种发根土壤杆菌(Agrobacterium rhizogenes)的方法研究了其对根癌病的抗性及其分离情况。结果表明,筑波4号实生群体中免疫、高度抗病、中度抗病、中度感病和高度感病类型分别占0.90%、1.80%、9.01%、18.92%和69.37%。筑波5号实生群体中免疫、高度抗病、中度抗病、中度感病和高度感病类型分别占1.01%、3.03%、8.08%、38.38%和49.49%。筑波4号和筑波5号对发根土壤杆菌的抗性存在显著分离现象,可从中筛选出抗性极强的植株。 相似文献
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Landscape Ecology - It has been widely acknowledged that exposure to green space (e-GS) has positive health benefits to urban residents. While most studies estimate e-GS from an availability or... 相似文献
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Robert E. Kennedy David P. Turner Warren B. Cohen Michael Guzy 《Landscape Ecology》2006,21(2):213-224
Biogeochemical models offer an important means of understanding carbon dynamics, but the computational complexity of many
models means that modeling all grid cells on a large landscape is computationally burdensome. Because most biogeochemical
models ignore adjacency effects between cells, however, a more efficient approach is possible. Recognizing that spatial variation
in model outputs is solely a function of spatial variation in input driver variables such as climate, we developed a method
to sample the model outputs in input variable space rather than geographic space, and to then use simple interpolation in
input variable space to estimate values for the remainder of the landscape. We tested the method in a 100 km×260 km area of
western Oregon, U.S.A. , comparing interpolated maps of net primary production (NPP) and net ecosystem production (NEP) with
maps from an exhaustive, wall-to-wall run of the model. The interpolation method can match spatial patterns of model behavior
well (correlations>0.8) using samples of only 5 t o 15% of the landscape. Compression of temporal variation in input drivers
is a key step in the process, with choice of input variables for compression largely determining the upper bounds on the degree
of match between interpolated and original maps. The method is applicable to any model that does not consider adjacency effects,
and could free up computational expense for a variety of other computational burdens, including spatial sensitivity analyses,
alternative scenario testing, or finer grain-size mapping. 相似文献
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M.J. Sánchez-Blanco M.F. Ortuño S. Bañon S. Álvarez 《The Journal of Horticultural Science and Biotechnology》2019,94(2):137-150
The shortage of water in many parts of the world has led to the development of new irrigation strategies such as regulated deficit irrigation and sustained deficit irrigation. Water deficit induces different morphological and physiological responses in ornamental plants, but the application of irrigation strategies can obtain quality plants well adapted to the environment. Deficit irrigation controls plant growth, and can be considered a sustainable technique which avoids the use of plant growth regulators. In addition, root system morphology can be modified by water stress to improve the ability to extract water from the soil and strengthen a plant’s physical support. In addition, the application of deficit irrigation during nursery period is a technique frequently used to harden plants before transplanting. Water deficit affects morphological and physiological aspects that might provide a capacity to adapt to adverse conditions. All these features contribute to increasing water use efficiency and the root to shoot ratio and root density, promoting the more rapid establishment of ornamental plants in garden or landscape settings. In view of the results obtained, it is possible to apply and validate the most appropriate irrigation strategy for each species and to obtain the full benefits of applying deficit irrigation.
Abbreviations: DI, Deficit irrigation; ETc, Crop evapotranspiration; gs, stomatal conductance; Pn, Net photosynthesis; RDI, Regulated deficit irrigation; SLA, Specific leaf area; WUE, Water use efficiency 相似文献