s-1, the little arbor that are slightlyshade-tolerant should be put the second synusia,the shrub that are shade-tolerant should be put the third synusia if Im>1100μmol?
(3) The Fv/Fm relative variable ratio (V%) of shade -tolerant and shade -loving species was higher than that of shade -intolerant and sun -loving species.
The leaf area, leaf specific weight, chrolophyll and carotenoid of the shade-tolerant varieties increased after domesticated with 1/5 natural light for 15 to 20days.
(2) The value of Fv/Fm of shade -tolerant species was higher than that of shade -intolerant species, and the most were sun -loving species with different shade -tolerant degrees;
Photosynthetic rate of the plant is the highest under 1 200 lx. At the same time, the content of the chlorophyll in its leaves is 300μmol· m -2 and its chlorophyll a/b 1.14. Both of them are lower than usual sun plant,w hich shows that the Myric nana is probably a shade tolerant species.
Our results also showed that seventy four per cent of the seedlings and saplings of shade tolerant species was recorded under the canopy. Interestingly, more than 70% of total natural regeneration of Korean pine was found within 2.5 m from the standing live trees, which is the average radius of crown projection.
However, it produced browning problems, although adding active carbon and transferring frequently can reduce the browning effect, it didn't differed much. According to the study on the fresh weight、 dry weight and water content, the leaf structure, the chlorophyll content and value of Ca/Cb, the photosynthesis characteristic of leaves, The shade tolerant ability of five plants (from strong to week) was in the order: Iris japonica、 Iris pseudacorus、 Iris tectorum、 Iris kaempferi、 Iris sanguinea。
and the interference of other shade tolerant evergreen broad leaved species gradually impeded the growth of the adult trees of P.massoniana by weakening the ability of its material synthesis and intensifying the ability of material decomposition along with the community succession, and withered away gradually.
Seedling of sunny species Albizzia lebbeck showed the most obvious response, while the two shade tolerant species Ormosia glaberrima and Ormosia pachycarpa showed the least responses.
Species represented a range of shade tolerance, but all individuals were measured in light gaps to control for environmental conditions and the availability of herbivores.
C4 grasses are virtually absent from shaded habitats, and the biochemical model is employed to examine the implications of IVD for shade-tolerance in C4 grasses.
We examined saplings and mature trees of paper birch, yellow birch, red maple and sugar maple, which varied in successional status (shade-tolerance) and co-occurred at Harvard Forest, Petersham, Mass., USA.
Mechanisms of adaptation of the photosynthetic apparatus at the level of pigment complex in a shade-tolerant bugle plant (Ajuga reptans L.) grown at full solar irradiation in an open plot were studied.
The data obtained indicate the role of the violaxanthin cycle in the protection of photosynthetic apparatus in a shade-tolerant plant against destruction under excessive irradiation.
This is contrasted to shade-tolerant species, in which specific gravity may take several decades to attain a minimum value, followed by only moderate increases thereafter.
Leaves are found to be steeply inclined in the upper canopy levels and foliage mass is located higher in the canopy than frequently observed in more shade tolerant species.
When large trees (dbh>amp;gt;70 cm) of the very shade tolerant species, Tsuga canadensis, die and fall, they are usually replaced by less tolerant species such as Betula alleghaniensis, Liriodendron tulipifera, and Magnolia fraseri.
Most species showed a complex growth response in which they resembled the shade intolerant extreme in some aspects of the response, and the shade tolerant extreme in other aspects.
Leaf loss decreased, and leaf survival percentages increased with increasing shade tolerance of species, indicating a slower leaf turnover for more shade tolerant species.
This paper present a species of extraneous weed that is native to the Andes of the south America. Now, it has become the wide distribution in low altitude region of the southern Yunnan.
The Spirit Valley forest, though seriously damaged in its past, has been well protected since 1940s. It possesses the genetal characteristics of the local vegetation in its floristic composition, appeatance and stand structure and is now in a stage of successional change. As compared with that in 1951, the pine forest (Pinus mass-oniana) is now reaching its mature age. Though its seedlings are numerous, none of them has become established. Several hardwood species have invaded the pine forest, their young t...
In this paper, the authors analyse on geographical distribution, climatic and soil adaptability, nutrient absorption and cycling, and photosynthesis rate of Tapiscia sinensis. It has been found that T. sinensis distributes sporadically in subtropical, medium lower-medium height mountainous regions. It is a tree with great adaptability to acidity in soils with pH values of 4.5 to 8.5 and can grow in cool climate, plentiful rainfall, great humidity, loose and well drained soil with abundant can stand moderate...
耐荫
shade tolerance
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