Influence of Drought Stress on Transpiring Water-consumption of Seedlings
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Water consumption
Water Stress
Platycladus
Drought stress
Afforestation
Water balance
Water use
Water Use Efficiency
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In this study,potted maize was subjected to three grades of soil water content,and we observed and compared stoma density,stoma open,stoma length and width of new developing leaves,and assayed the effects of different soil water content on stomatal conductance,water transpiration consumption and biomass of different organs.The experiment results showed that the decrease of soil water content led to an increase of the stomatal density and a decrease of the stomatal conductance.The reduction of stoma width under soil drought stress was more significant than the length.The mild water stress and medium water stress resulted in a decrease in water transpiration consumption by about 16.3% and 36.9%,while the biomass decreased by 17.8% and 40.2%,whereas root/shoot ratio increased by 5.9% and 17.7%.Under mild water stress and moderate water stress,compared to control,the yield of maize decreased by 3.92% and 69.6%,while the water use efficiency increased by 13.6% and decreased 51.8% respectively.This research indicated that mild soil water stress increased the water use efficiency in the case of no reduction of corn yield,whereas the medium water stress decreased the yield significantly,and tasseling stage is the period at which the daily water consumption was the maximum.
Stoma (medicine)
Stomatal Conductance
Water Use Efficiency
Water consumption
Water Stress
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In the 22-day drought period after sufficient irrigation,the leaf and stem water potential of four years apple trees were determined at 8:00 and 15:00,respectively,and the diurnal variation of the leaf and stem water potential under well irrigation,medium water deficiency and sever drought stress were measured.The results showed that the change range of leaf water potential was 0.2 MPa,and there had not significant difference under three soil water conditions.The stem water potential at 15:00 was-0.6 MPa under well irrigation,and was-1.8 MPa under sever drought stress,which decreased by 1.2 MPa.In the whole drought stress,the change of stem water potential was affected by the day evaporation,and the change trend consistent with that of soil water potential.With the aggravation of drought resistance,the water potential gradient of stem and leaf changed greatly,which was 1.5 MPa under well irrigation,and was 0 MPa under sever drought stress.The water potential of outside shoots,and the changes of the water potential gradient of stem and leaf were more sensitive to soil water deficit than leaf water potential.
Water potential
Main stem
Potential evaporation
Water Stress
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Study on adaptability of physiological ecology of Quercus liaotungensis seedlings under soil drought
Using Quercus liaotungensis as experiment material and pot culture experiments simulating different soil drought, its physiological ecology response under soil drought were studied. The results showed that its consumption water was obvious descended and ahead of peak of consumption water with soil water decreasing. Peak feature of consumption water changed from single to double under severe soil drought. Its leaf potential changed slowly early stress and descended rapidly later. Especially, model of leaf potential was “M” under severe stress. Leaf water content wasn't sensible to soil water content. Water holding ability had slightly increased under media drought. It was a low transpiration tree and average transpiration rate 2.98 μg·cm -2·s -1.Diurnal change of transpiration rate was different in different season. Diurnal change of transpiration rate was double peak curve under normal water and single peak curve under media drought and maintained low level or up and down change under severe drought in August. Transpiration rate decreased 50% in September and had obvious single and double peak. Simple correlation of transpiration rate and environmental factors was analyzed to show that photosynthetic radiation had significant effected on transpiration rate under normal and media drought and air temperature had obvious effected on transpiration rate under severe drought. Transpiration rate ascended under media drought and rapidly descended under severe drought and photosynthesis rate, WUE, carboxylation efficiency decreased with soil water decreasing. Root/Shoot increased and growth of shoot and WUE1 decreased. WUE2 ascended under media drought and descended under severe drought. Its seeding had weak resistance to high temperature and intensive radiation which decreased photosynthesis rate and transpiration rate and physiological activity had significant decreased under severe drought especially.
Water Use Efficiency
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In order to provide theoretical basis for vegetation restoration in rocky desertification district,the seedlings of 5 tree species,Dodonaea viscosa( Linn.) Jacq.,Fokienia hodginsii( Dunn) Henry et Thomas,Platycladus orientalis( Linn.) Franco,Zanthoxylum bungeanum Maxim,and Cinnamonum camphora L. with same age in the district were used as study objects,through potted water control experiments,to measure and calculate the chlorophyll content,net photosynthetic rate,transpiration rate,stomatal conductance,intercellular CO2concentration, water use efficiency,and some other physiological and ecological index,and the adaptabilities and differences among the 5 tree species under different moisture gradients were compared. The results are as follows.( 1) With the increasing drought stress,the chlorophyll content of 5 tree species changed in different levels,D. viscosa showed a trend of gradually reducing,P. orientalis and F. hodginsii showed a trend of decrease and then increase,while Z. bungeanum and C. camphora showed a trend of increase and then decrease;( 2) The physiological and ecologicalparameters expressed different variation: the net photosynthetic rate,transpiration rate,and stomatal conductance showed decreasing trends,and under moderate and severe drought stress,they reduced significantly,the net photosynthetic rate of P. orientalis decreased by 100. 5%,which was the sharpest decline under severe drought stress; the intercellular CO2concentration dropped under mild drought stress,while increased under moderate and severe drought stress; the water use efficiency increased under mild and moderate drought stress,but decreased under severe drought stress; the water use efficiency of C. camphora decreased under severe drought,but still 1. 05 times that of the contrast.( 3) Based on a comprehensive analysis of the physiological and ecological indexes,it showed that all the seedlings could tolerate a certain degree of drought stress,belonging to the stronger drought-resistant ability trees,but the water control drought tolerance ability of C. camphora was higher than that of the other 4 species and is more capable to adapt to environment of rocky desertification district.
Cinnamomum camphora
Platycladus
Stomatal Conductance
Water Use Efficiency
Drought stress
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Based on the growth and development rule of tomato,the lower limits of soil moister in its seedling stage,flowering and fruit setting stage,fruiting bearing stage were respectively set as 50%,60%,75% of field maintaining water quantity,soil irrigation maximum in each growing periods was set as three water supply levels water supply levels,effects of water stress on growth development and physiological characteristic of tomato were studied.The results show that water stress affected plant height,stem diameter,chlorophyll content,diurnal photosynthetic and transpiration rate.The time when the maximum points diurnal change for leaf photosynthetic rate appeared was earlier under water stress than that without water stress,along with water stress degree increasing,the transpiration rate decreased,which was beneficial to regulate transpiring water consumption.According to the relationship between irrigation water and yield,the preferable yield(12.84×104 kg/hm2) was obtained when irrigation water amount was 4025.80 m3/hm2.
Water Stress
Water Use Efficiency
Stomatal Conductance
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Vitex negundo
Drought Tolerance
Drought stress
Water Use Efficiency
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Pot-cultured seabuck thorn seedling's growth,photosynthesis and water relations under soil water stress were researched.The main results showed that:transpiration rate (Tr) declined with the deepening of soil water stress,while the diurnal change of Tr had little change.They all displayed parabolic shape,which peak value was at 11:00.The decreasing range of water content,water potential,osmotic potential and turgor were smaller,and leaf growth rate of side shoot and photosynthesis rate (Pn) in a higher level under light stress and medium water stress,which showed the typical physiological character belonging to drought-enduring plant.Serious soil water stress made above index fell remarkably and 33.3% seabuckthorn seedlings died after long term drought stress.
Turgor pressure
Water potential
Stomatal Conductance
Water Stress
Osmotic pressure
Water Use Efficiency
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Responses of Quercus ilex L. seedlings from three different localities in Italy to experimentally imposed drought stress were analysed. Predawn (Ψpd) and midday (Ψm) leaf water potential of stressed seedlings decreased on an average until -4.0 and -4.2 MPa, respectively, in the severe water stress. At the end of the severe water stress the relative water content (RWC) was 72.5 - 83.6 % and the photosynthetic rates (PN) near zero. The critical threshold value of Ψpd for complete stomatal closure was from -4.0 to -4.5 MPa. The leaf damage after the severe water stress was significantly greater in seedlings originated from the acorns of climax area (45 % total leaf injured area and 40 % fallen leaves) than in the other seedlings (on an average 20.5 % total leaf injured area and 21 % fallen leaves).
Water Stress
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The growth and water use efficiency characteristics of four native grasses in Loess Plateau were studied under different soil water contents.The results showed that water consumption of those species decreased with the increase of soil drought stress,and water consumption of those grasses was different: Bothriochloa ischaemumAgropyron cristatumCleistogenes songoricaStipa bungeana.The highest water consumption in one day,ten-day and one month were different.The highest water consumption day of medium and severe drought stress occurred about 10 days earlier than the adequate soil water content.The time of day when the greatest water consumption occurred arrived early with the decrease of soil water contents.The growth of plant height and single leaf area of the four native grasses were the fastest under adequate soil water contents,and were the lowest under severe drought.Under drought condition,the growth of four grasses was all inhibited,especially for S.bungeana and C.songorica.The leaf water content of different species decreased with the increase of soil water stress.The leaf water content of A.cristatum and B.ischaemum were higher than that of S.bungeana and C.songorica obviously.Water use efficiency of S.bungeana and C.songorica decreased with the decrease of soil water content,they had lower water consumption and low WUE characteristics.A.cristatum and B.ischaemum had the highest WUE under medium drought treatments,respectively.A.cristatum had low water consumption and high WUE characteristic,B.ischaemum had high water consumption and high WUE characteristic.
Water Use Efficiency
Loess plateau
Water use
Water consumption
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Pot experiments were conducted to study the effects of drought and rewatering on photosynthetic characteristics and leaf water use efficiency of winter wheat under different fertility conditions.The results showed that photosynthesis rate,transpiration rate,stomatal conductance and intracellular CO2 content decreased with the reduction of fertilizer levels under the same water condition,and decreased with the serious of drought levels under the same fertility condition.Photosynthesis rate,transpiration rate,stomatal conductance and intracellular CO2 content all presented compensatory or ultra compensatory effect after 24 hours of rewatering,and the restoration degree was greater under moderate drought stress than under serious drought stress.Photosynthesis rate of high fertility and 85% soil water treatment was the highest among all the treatments,while leaf water use efficiency exhibited the highest in high fertility and 55% soil water treatment.The results suggested that properly increasing fertilizer amount was conducive to the recovery of photosynthetic system and increase of water use efficiency winter wheat,which were rewaterd after moderate drought stress at regreen stage.And the amount of the base fertilizer should be reduced under serious drought stress.
Stomatal Conductance
Water Use Efficiency
Water Stress
Drought Tolerance
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