Effects of soil water content on stomatal conductance, transpiration, and photosynthetic rate of Caragana korshinskii under the influence of coal mining subsidence

Abstract The purpose of this study was to evaluate growth, chlorophyll content, and photosynthesis in Jatropha at different levels of soil moisture. Plants were cultivated in containers and the treatments of the soil water content evaluated were: 0% (without watering), 20, 40, 60, and 80% soil water content. Plant height was statistically similar for all treatments, but the number of leaves differed significantly. Total dry matter and chlorophyll at 40, 60, and 80% soil water content were statistically similar, but different from 0 and 20% soil water content. Leaf area at 40, 60, and 80% soil water content was statistically different from 0 and 20% soil water content. The photosynthetic rate, transpiration and stomatal conductance at 60 and 80% soil water content were statistically similar but different from 0 and 20% soil water content. Water stress affected growth, chlorophyll content, photosynthetic rate, transpiration, and stomatal conductance.

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Effect of Soil Water Content on Growth, Photosynthetic Rate, and Stomatal Conductance of Kimchi Cabbage at the Early Growth Stage after Transplanting

Protected horticulture and Plant Factory ◽

10.12791/ksbec.2017.26.3.151 ◽

2017 ◽

Vol 26 (3) ◽

pp. 151-157

Author(s):

Sung Kyeom Kim ◽

성겸 김 ◽

Hee Ju Lee ◽

Hee Su Lee ◽

Boheum Mun ◽

...

Keyword(s):

Stomatal Conductance ◽

Water Content ◽

Soil Water ◽

Soil Water Content ◽

Photosynthetic Rate ◽

Growth Stage ◽

Early Growth ◽

Early Growth Stage

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Coupling model of ecohydrology and simulation of typical shrub ecosystems on the Loess Plateau

10.5194/egusphere-egu2020-4423 ◽

2020 ◽

Author(s):

Yu Zhang ◽

Xiaoyan Li ◽

Wei Li ◽

Weiwei Fang ◽

Fangzhong Shi

Keyword(s):

Water Content ◽

Soil Water ◽

Soil Water Content ◽

Loess Plateau ◽

Field Experiments ◽

Annual Precipitation ◽

The Loess Plateau ◽

Rainfall Interception ◽

Area Index ◽

Caragana Korshinskii

Shrub is the main vegetation type for vegetation restoration in the Loess Plateau, which plays an important role in the regional ecosystem restoration. Study on the relationships between vegetation and soil water of typical shrub ecosystems are significant for the restoration and reconstruction of ecosystems in the Loess Plateau. Three typical shrub (Hippophae rhamnoides Linn., Spiraea pubescens Turcz., and Caragana korshinskii Kom.) ecosystems were chosen in the Loess Plateau. Field experiments were conducted to investigate the factors that influencing the processes of rainfall interception and root uptake of typical shrubs. S-Biome-BGC model was established based on the Biome-BGC model by developing the rainfall interception and soil water movement sub-models. The model was calibrated and verified using field data. The calibrated S-Biome-BGC model was used to simulate the characteristics of leaf area index (LAI), net primary productivity (NPP), soil water content and the interactions among them for the shrub ecosystems along the precipitation gradients in the Loess Plateau, respectively. The results showed that the predictions of the S-Biome-BGC model for soil water content and LAI of typical shrub ecosystems in Loess Plateau were significantly more accurate than that of Biome-BGC model. The simulated RMSE of soil water content decreased from 0.040~0.130 cm3 cm-3 to 0.026~0.035 cm3 cm-3, and the simulated RMSE of LAI decreased from 0.37~0.70 m2 m-2 to 0.35~0.37 m2 m-2. Therefore, the S-Biome-BGC model can reflect the interaction between plant growth and soil water content in the shrub ecosystems of the Loess Plateau. The S-Biome-BGC model simulation for LAI, NPP and soil water content of the three typical shrubs were significantly different along the precipitation gradients, and increased with annual precipitation together. However, different LAI, NPP and soil water correlations were found under different precipitation gradients. LAI and NPP have significant positive correlations with soil water content in the areas where the annual precipitation is above 460~500 mm that could afford the shrubs growth. The results of the study provide a re-vegetation threshold to guide future re-vegetation activities in the Loess Plateau.

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Physiological and climate controls on foliar mercury uptake by European tree species

10.5194/bg-2021-239 ◽

2021 ◽

Author(s):

Lena Wohlgemuth ◽

Pasi Rautio ◽

Bernd Ahrends ◽

Alexander Russ ◽

Lars Vesterdal ◽

...

Keyword(s):

Stomatal Conductance ◽

Water Content ◽

Soil Water ◽

Soil Water Content ◽

Tree Species ◽

Physiological Activity ◽

Growing Season ◽

Relevant Parameter ◽

Uptake Rates ◽

Mercury Uptake

Abstract. Despite the importance of vegetation uptake of atmospheric gaseous elemental mercury (Hg(0)) within the global Hg cycle, little knowledge exists on the physiological, climatic and geographic factors controlling stomatal uptake of atmospheric Hg(0) by tree foliage. We investigate controls on foliar stomatal Hg(0) uptake by combining Hg measurements of 3,569 foliage samples across Europe with data on tree species traits and environmental conditions. To account for foliar Hg accumulation over time, we normalized foliar Hg concentration over the foliar life period from the simulated start of the growing season to sample harvest. The most relevant parameter impacting daily foliar stomatal Hg uptake was tree functional group (deciduous versus coniferous trees). On average, we measured 3.2 times higher daily foliar stomatal Hg uptake rates in deciduous leaves than in coniferous needles of the same age. Across tree species, for foliage of beech and fir, and at two out of three forest plots with more than 20 samples, we found a significant (p < 0.001) increase in foliar Hg values with respective leaf nitrogen concentrations. We therefore suggest, that foliar stomatal Hg uptake is controlled by tree functional traits with uptake rates increasing from low to high nutrient content representing low to high physiological activity. For pine and spruce needles, we detected a significant linear decrease of daily foliar stomatal Hg uptake with the proportion of time, during which vapor pressure deficit (VPD) exceeded the species-specific threshold values of 1.2 kPa and 3 kPa, respectively. The proportion of time within the growing season, during which surface soil water content (ERA5-Land) in the region of forest plots was low correlated negatively with corresponding foliar Hg uptake rates of beech and pine. These findings suggest that stomatal uptake of atmospheric Hg(0) is inhibited under high VPD conditions and/or low soil water content due the regulation of stomatal conductance to reduce water loss under dry conditions. We therefore propose, that foliar Hg measurements bear the potential to serve as proxy for stomatal conductance. Other parameters associated with forest sampling sites (latitude and altitude), sampled trees (average age and diameter at breast height) or regional satellite observation-based transpiration product (GLEAM) did not significantly correlate with daily foliar Hg uptake rates. We conclude that tree physiological activity and stomatal response to VPD and soil water content should be implemented in a stomatal Hg model, to assess future Hg cycling under different anthropogenic emission scenarios and global warming.

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Photosynthesis and Stomatal-Conductance Responses of Johnsongrass (Sorghum halepense) to Water Stress

Weed Science ◽

10.1017/s0043174500082990 ◽

1985 ◽

Vol 33 (5) ◽

pp. 635-639 ◽

Cited By ~ 11

Author(s):

Bryan L. Stuart ◽

Daniel R. Krieg ◽

John R. Abernathy

Keyword(s):

Water Stress ◽

Stomatal Conductance ◽

Water Potential ◽

Water Content ◽

Soil Water ◽

Soil Water Content ◽

Osmotic Potential ◽

Grain Filling ◽

Leaf Temperature ◽

Sorghum Halepense

The influence of water stress on johnsongrass [Sorghum halepense(L.) Pers. ♯ SORHA] physiology was evaluated in a semiarid environment. Stomatal conductance of johnsongrass responded to more negative leaf water potential and increasing leaf temperature. The sensitivity of the leaf temperature effect was dependent on the soil water content. At low soil water content, conductance was limited by low water potential, and increasing leaf temperature had little effect. Conductance of CO2was related to net photosynthesis in a curvilinear manner, with conductance levels greater than 0.3 mol·m-2· s-1being in excess of that necessary for maximum photosynthesis. At both high conductance levels and low levels associated with increased water stress, intercellular CO2concentration increased, indicating nonstomatal limitations to photosynthesis. Decreased osmotic potential provided the highest correlation with the linear decline of photosynthetic rate as stress intensified. The expression of osmotic adjustment in johnsongrass is reported during grain filling. Plants in the milkdough stage of grain filling had approximately 0.3 MPa lower osmotic potential at any relative water content than those at anthesis.

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Estimating mesophyll and biochemical limitations to carbon assimilation of potato crop during drought

10.5194/egusphere-egu21-11021 ◽

2021 ◽

Author(s):

Quentin Beauclaire ◽

Bernard Longdoz

Keyword(s):

Water Content ◽

Soil Water ◽

Soil Water Content ◽

Photosynthetic Rate ◽

Potato Crop ◽

Carbon Assimilation ◽

Development Stage ◽

Rate Variation ◽

Drought Treatment ◽

The Impact

Understanding how plant crops respond to drought is essential for both improving photosynthesis modelling and predicting the impacts of climate change on agricultural production. Over the past years, researches have focused on identifying the stomatal processes that restrict the net photosynthetic rate and quantifying the importance and how different factors limit it. However, the constraints to photosynthesis coming from perturbation in the mechanisms taking place from sub-stomatal cavities to carboxylation sites in chloroplasts are not yet fully understood especially in plant crops. The aim of our study was to investigate the impact of drought on the light-limited photosynthesis rate for potato (Solanum Tubersosum) by measuring the photosynthesis limitations and partitioning them between stomatal, mesophyll and biochemical constrains during a field-experiment that took place in Wallonia during the summer 2020. Gas-exchange and fluorescence techniques were used to quantify mesophyll conductance (gm), stomatal conductance (gs), Rubisco carboxylation rate (Vcmax) and electron transport rate (Jmax) in response to low soil water content during the tuber development stage. We obtained a clear reduction of the leaf assimilation and performed a limitation analysis identifying which factor contributed the most to the light-saturated photosynthetic rate (An) decrease. During the one-month drought treatment, An, gm, Jmax and Vcmax significantly decreased when the relative extractable water (REW) passed below a threshold ranging from 0.5 to 0.7 . On the opposite, g1, the slope of the gs dependence on environmental factors, remained constant. When soil water was not limiting, most of the light-saturated photosynthetic rate variation was explained by VPD while mesophyll and biochemical influence progressively increased when soil water content declined. At the maximum drought intensity, gm and Vcmax reduction explained respectively 40 % and 30% of the light-saturated photosynthetic rate decrease. The coexistence of aerial drought (high VPD) accounted only for 3% of the total limitation. This highlights the importance of mesophyll and biochemical limitations on potato photosynthesis and development.

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Soil Moisture Dynamics and Water Balance of Caragana microphylla and Caragana korshinskii Shrubs in Horqin Sandy Land, China

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.864-867.2545 ◽

2013 ◽

Vol 864-867 ◽

pp. 2545-2549

Author(s):

Na Zhang ◽

De Ming Jiang ◽

Toshio Oshid

Keyword(s):

Water Balance ◽

Water Content ◽

Soil Water ◽

Soil Water Content ◽

Water Dynamics ◽

Soil Horizon ◽

Horqin Sandy Land ◽

Sandy Land ◽

Caragana Korshinskii ◽

Caragana Microphylla

Based on the soil water balance theory, soil water dynamics and evapotranspiration (ET) of artificial sand-fixing Caragana microphylla and Caragana korshinskii shrubs with three different densities were researched in Horqin sandy land during the growing season. Results showed that mean soil water content of three shrub densities changed with time, different density caused spatial changes of soil water content in the deep soil horizon, but brought little influence on soil water temporal trends. The annual ET/P ratio varied between 83.21% and 99.6% for three shrub densities and the ET was not continually increased along with increase in shrub density. Based on the comprehensive analysis of soil water content, ET, and plant coverage for three shrub densities, the optimum density of C. microphylla and C. korshinskii shrubs (20 years old) in the study area could be about 1000 trees/ha. The findings were helpful for vegetation restoration in Horqin sandy land of China.

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