共查询到19条相似文献,搜索用时 125 毫秒
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为了解决高羊茅冷季型草种在武汉安全越夏的问题,进行了Houndog、Arid、Barlexal等高羊茅品种单播及品种混播试验,结果表明:Houndog、Shenandon、Barlexal、Arid品种在本地区越夏情况表现较好。Arid+shenandon、Houndog+Shenandon等比例混合播种,其草坪抗病性比单播的明显增强。 相似文献
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为了解决高羊茅冷季型草种在武汉安全越夏的问题,进行了高羊茅草坪不同土壤基质对比试验。结果表明:黄粘土、河沙因过粘或沙性过重均不利于草坪生长,降低抗逆性,黄粘土与河沙按40%~60%混合,改良效果好。 相似文献
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优良草坪品种—假俭草 总被引:17,自引:0,他引:17
作为草坪种植的草种,按其对温度的要求可分为暖季型草种和冷季型草种两大类.近年来,南京市引进种植的多为冷季型草种.如剪股颖、早熟禾、黑麦草等.这类草种对温度要求较低(地上部分在4℃以上即开始生长),但在南京地区,因夏季气温较高,有休眠现象,病害也较重,故极易造成斑秃,不宜大面积使用.而暖季型草种在长江流域一带只有狗牙根、结缕草等,草种比较单调.根据我们对南京市各公园不同草种生长状况的调查,认为假俭草是一种适应性强、生长 相似文献
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通过对冷季草坪草种的引种与栽培试验,筛选出了一批适宜我省推广应用的冷季草种,总结了一套冷季草坪铺装与管理技术,并指出因地制宜、适地适草是建设好冷季草坪的基础,抓好越夏管理是使冷季草坪欣欣向荣的关键。 相似文献
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论观赏草的特性及其在园林景观中的应用 总被引:7,自引:0,他引:7
观赏草是一类新型的植物造景材料,而且越来越多地被用于各种景观设计中。我国应用观赏草的时间较短,对观赏草的认识还不够,为在园林中更好的应用观赏草类,通过对观赏草的概念、观赏特性、生物学特性等的研究阐述,提出观赏草的11种应用形式,并探讨观赏草在园林应用中应注意的问题及解决方法。 相似文献
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Three pines species, three evergreen broadleaf trees, one C(3) and two C(4) perennial grasses of subtropical Taiwan were studied to elucidate the correlation between photosystem II (PSII) efficiency and photochemical reflectance index (PRI = (R(531) - R(570))/(R(531) + R(570))). Measurements were made at two sites differing in altitude (800 and 2600 m) over several growing seasons. At high elevation, potential PSII efficiency, measured by chlorophyll fluorescence (the ratio of variable to maximal fluorescence; F(v)/F(m)) at predawn, decreased with decreasing air temperature and varied greatly among species. At the lowest air temperature (-3 degrees C) studied, variation in F(v)/F(m) among species ranged from 0.33 to 0.72. In contrast, at low elevation where air temperature was moderate, seasonal variation in F(v)/F(m) was small in all of the study species. When species, elevation and season data were pooled, despite the high variation in F(v)/F(m) among species, a good correlation between F(v)/F(m) and PRI was observed. When compared at the same value of PRI, F(v)/F(m) of evergreen trees was higher than that of perennial grasses; however, when the minimum temperature on the measurement day was below 0 degrees C, F(v)/F(m) was underestimated relative to PRI. We conclude that PRI could be used as a remote indicator of photosynthetic function when air temperature is above 0 degrees C. 相似文献
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J. A. Nboyine D. Saville S. Boyer R. H. Cruickshank S. D. Wratten 《Journal of pest science》2017,90(1):173-182
The effects of the association between grasses and fungal endophytes on orthopterans are very poorly studied although they are important grassland pests. Here, the endemic New Zealand weta, Hemiandrus sp. ‘promontorius’, and Festulolium loliaceum infected with Epichloë uncinata, were used to study the effect of endophyte-mediated resistance in grasses on this large orthopteran insect in the laboratory, and the effects of this interaction on the grass. The insect was presented with F. loliaceum with and without E. uncinata infection in no-choice and paired choice experiments. Other controls were Epichloë festucae-infected Festuca rubra and endophyte-free Lolium perenne. In no-choice experiments, persistent attempts by the insect to graze the endophyte-infected grasses (but promptly abandoning them) resulted in a significantly higher number of plants lost due to excision at their stems after the first bite (P = 0.004). The inability of affected grasses to compensate for the lost biomass resulted in a lack of significant difference between the dry biomass of endophyte-infected and endophyte-free controls (P = 0.206). However, in choice experiments, there was a preference for the endophyte-free controls when they were paired with the endophyte-infected grasses (P < 0.05). The current work shows that endophyte-infected grasses can sustain high plant losses when attacked by an orthopteran insect in the absence of an alternative food source. This contrasts other endophyte/herbivory experiments in which high herbivory occurs because chemical plant defences are at a low concentration or the endophytes have other non-toxin roles in the plant. 相似文献
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Silvopastoral systems may overyield compared to monocultures as a result of higher resource capture and/or facilitation effects
of the trees on the pastures. Festuca pallescens (St. Ives) Parodi, a forage species of Patagonia, is vulnerable to water deficit, suggesting that it may benefit from the
facilitative effects of trees. Radiation (PPFD), temperature, relative humidity (RH) and soil water distribution during the
growing season were measured under different tree cover levels in ponderosa pine-based silvopastoral systems. PPFD decreased
with increasing tree cover, and the decrease was lower in the positions under than between tree crowns. No significant differences
were observed for temperature, RH nor for soil water content between treatments. Pre-dawn water potential of grasses during
the growing season showed similar high values in all treatments. However, cumulative water stress was slightly lower in high
tree cover treatments than in open situations. Leaf water potential of the grasses during the day was always lower in open
grassland than in forested plots. The growth of the grasses showed no significant differences between treatments, but mean
growth tended to decrease in the more densely planted treatments. We concluded that F. pallescens is a species that is biologically sound for use in silvopastoral systems, because the balance between facilitation and competition
can be positive under the semiarid conditions of Patagonia. 相似文献
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M. P. Clavijo P. S. Cornaglia P. E. Gundel M. Nordenstahl E. G. Jobbagy 《Agroforestry Systems》2010,80(2):275-282
Forage production in silvopastoral systems of the Flooding Pampa is based on cool season grasses with a relatively asynchronous
phenology regarding their accompanying deciduous trees. However, the productivity of cool season grasses in these systems
is usually low. The hypothesis of this work is that the low productivity of cool season grasses is caused by tree litter constraining
plant recruitment. Emergence and establishment (reproductive propagation), and tillering (vegetative propagation) patterns
of tall fescue, a cool season grass in the region, were studied in two pairs of adjacent non-afforested and afforested poplar
stands (tree age 26–28 years, tree density 453–797 plants ha−1). Observational and manipulative (i.e. addition of seeds, leaf litter removal) experiments indicated that the recruitment
of tall fescue plants is strongly limited by the fall of poplar leaves over emerged seedlings, during autumn. Results suggest
that any management practice capable of removing poplar litter, either through grazing or machinery, could neutralize this
limitation enhancing the herbaceous primary production of the system. 相似文献
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