PLANTS ECOLOGY 1
Lightcompensation point is referred to total light concentrationrepresented on the light curve where the rate at which respirationtakes place is equal to rate of photosynthesis. For instance, carbon(IV) oxide uptake during the process of photosynthesis is preciselyequal to the carbon dioxide released during respiration and oxygenproduced in the process of photosynthesis is similar to carbon (IV)oxide uptake. Notably, respiration rate is always constant to matchthe photosynthesis rate for the plant not to devour or build biomass.In this case, the intracellular concentration of CO2 influences thelevel of photosynthesis and photorespiration (Zufferev et al, 2015).It is, therefore, important for plants to balance the rate ofphotosynthesis and the rate of respiration hence compensation pointis achieved. Therefore LCPs is directly related to transpirationrate.
Belowlight compensation point it is observed that respiration occursrapidly than photosynthesis hence if a plant is close to thissaturation point it will experience little growth or no growth atall. In this case, plant species B will grow at a faster rate sincethey have a higher level of compensation points, therefore,experiences high photosynthesis rate. This response enables them tomaintain a progressive and efficient photosynthesis at low lightintensities.
Plantspecies vary in their response to light therefore in the canopyforest, shade leaves tend to have an active photosynthesis at lowlight levels. Plant species A will have many seedlings and saplingsrespiration rate is very high hence experiencing rapid metabolism.They are also suited to growing at a lower light level.Significantly, light compensation point is lower in plant species Aand are capable of photosynthesizing at a slightly higher rate in thecanopy forest. This plant species has a lower compensation rate and ahigh transpiration rate. In this case, respiration rate is lower, andthe plant species can absorb light rapidly.
Waterstress is directly related to photosynthesis rate hence transpirationrate is also affected. It is noted that the presence of carbon (IV)oxide results in stomatal closure hence photosynthesis metabolismshifts. The rate of transpiration of the two species are observed tovary as well as their pre-dawn water status does not match. Thereduction in photosynthetic level causes conductance in stomata hencethe rate of transpiration is also affected. In this case, plantspecies A experienced the most stress. This is because the pre-waterpotential is observed to be very low before the winter rains comparedto species B. Decrease in rate of transpiration of species A was as aresult of stomatal closure which was followed by a great decrease inwater potential.
Plantspecies A will recover the soonest from the water deficit. It is sobecause the species A is well-adapted water stress as compared to theother species B after the winter rains the species exhibited a verylow transpiration rate with very high water potential. On the otherhand, the relative root depth was small, the number of stomataincreased and shrinking of leaves occurred for species B. Thisoccurred to enhance reduced water absorption and maintain the osmoticpressure.
Plantspecies A is likely to dominate the driest habitat. This is becausethe species managed to have a very low transpiration rate beforewinter rains and a much lower pre-dawn water potential. It`s evidentthat this species` roots were able to tap water from deeper soillayers making it maintain a higher rate of water absorption.
SpeciesA is likely to dominate the N-facing slope while species B willinhabit S-facing slope in great numbers hence differentiating theirdominance. The zone C is a low-density forest that comprises an openhabitat with plenty light from the sun with inadequate shade,therefore, termed as woodland that supports shrubs and herbaceousplants. The N-facing slope also experiences biological interactionsof species with effects of temperature which may be direct orindirect.
First,when the temperature of air is reducing it normally leads to anincreasing height that directly impacts the length of growingpatterns and adaptations at different altitudes of the mountainzones. Secondly, Mountains at higher elevations receive high intenseradiations than the bottom plains. Therefore light is a major factoris the development and growth of plant. Similarly, as warm moist airtends to go up the windward side of the mountain the air temperaturebecomes icy and its ability to hold moisture is reduced, and this isalso noted in cases where moisture is influenced by the degree ofprecipitation.
Zonesare higher on the slope and lower on the other because theyexperience varying environmental conditions hence resulting intoaltitudinal zones as latitude is increased.
VegetativeZone C is likely to have species that are more adapted to dryconditions. The zone is termed as an evergreen woodland forest withlimited shade and adequate sunlight that comprise shrubs andherbaceous plants.
Lowerelevations mostly exhibit fewer species distribution since at thislatitudes the soils are more acidic such as the tropical rain forestzones while in the higher elevations such as the subalpine weatheringis hindered by extremely low temperatures making the ground coarsehence variations in the vegetative distribution.
Thesoils would exhibit different formations and nutrient content. As aresult of this, decomposition levels and weathering will varytherefore the soils will support vegetation at various degrees suchas Rocky Mountain of the western United States.
Theprinciple of allocation summarizes and points out that resources arenot sufficient to supply the needs of all plant functions andactivities. In this case, plant species A and B are subjected todifferent environmental conditions hence can adapt in various ways todefend their survival and reproduction. For instance, the change inphysiological pattern of species A to suite the conditions of waterstress is one way the principle of allocation is significant. Therate of transpiration, as well as their water potential, differsamong the species A and B.
Zufferey,V., Murisier, F., & Schultz, H. R. (2015). A model analysis ofthe photosynthetic response of Vitis vinifera L. cvs Riesling andChasselas leaves in the field: I. Interaction of age, light andtemperature. VITIS-Journal of Grapevine Research,