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K.S. Bremer
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Capturing the Plant-Water Dynamics of Corn
A study on the stomatal conductance and the leaf water potential of corn during the growing season
Master thesis
(2019)
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Karin Bremer, Susan Steele-Dunne, Nick van de Giesen, Bob Ursem, Hadi Hajibeygi, Paul Vermunt
This study aims to characterize the variation in stomatal conductance and leaf water potential of corn plant in height over time on a diurnal time-scale and on a seasonal time-scale, under well-watered and water stressed conditions.
An additional objective was the development of a protocol for plant-water relation measurements in radar experiments.
Field experiments were done to measure the leaf water potential by conducting pre-dawn measurements three times a week, evening measurements once a week and a mid-day measurement in the beginning and at the end of the growing season. The stomatal conductance was measured multiple times per day for three days a week, given that there was no precipitation. As the research is part of a larger project, additional hydrological data, soilmoisture data and sap flow data were collected.
For the stomatal conductance a clear variation over height was observed. This variation was caused by limited solar radiation for the lower leaves. The leaves that received full solar radiation had clear diurnal cycle in stomatal conductance and a high variation in stomatal conductance. In water-stressed conditions, it is expected to see a change in stomatal behaviour in these leaves.
For the leaf water potential, no values were reached that have been connected to water stress in the literature. Also, no water stress coping mechanisms were observed in the corn. From this it can be concluded that no water stress took place during this experiment for the days on which data was collected. In the leaf water potential data a clear influence of the soil water potential was observed. For the leaf water potential, no values were reached that have been connected to water stress in the literature. Also, no water stress coping mechanisms were observed in the corn. From this it can be concluded that no water stress took place during this experiment for the days on which data was collected. In the leaf water potential data a clear influence of the soil water potential was observed. ...
An additional objective was the development of a protocol for plant-water relation measurements in radar experiments.
Field experiments were done to measure the leaf water potential by conducting pre-dawn measurements three times a week, evening measurements once a week and a mid-day measurement in the beginning and at the end of the growing season. The stomatal conductance was measured multiple times per day for three days a week, given that there was no precipitation. As the research is part of a larger project, additional hydrological data, soilmoisture data and sap flow data were collected.
For the stomatal conductance a clear variation over height was observed. This variation was caused by limited solar radiation for the lower leaves. The leaves that received full solar radiation had clear diurnal cycle in stomatal conductance and a high variation in stomatal conductance. In water-stressed conditions, it is expected to see a change in stomatal behaviour in these leaves.
For the leaf water potential, no values were reached that have been connected to water stress in the literature. Also, no water stress coping mechanisms were observed in the corn. From this it can be concluded that no water stress took place during this experiment for the days on which data was collected. In the leaf water potential data a clear influence of the soil water potential was observed. For the leaf water potential, no values were reached that have been connected to water stress in the literature. Also, no water stress coping mechanisms were observed in the corn. From this it can be concluded that no water stress took place during this experiment for the days on which data was collected. In the leaf water potential data a clear influence of the soil water potential was observed. ...
This study aims to characterize the variation in stomatal conductance and leaf water potential of corn plant in height over time on a diurnal time-scale and on a seasonal time-scale, under well-watered and water stressed conditions.
An additional objective was the development of a protocol for plant-water relation measurements in radar experiments.
Field experiments were done to measure the leaf water potential by conducting pre-dawn measurements three times a week, evening measurements once a week and a mid-day measurement in the beginning and at the end of the growing season. The stomatal conductance was measured multiple times per day for three days a week, given that there was no precipitation. As the research is part of a larger project, additional hydrological data, soilmoisture data and sap flow data were collected.
For the stomatal conductance a clear variation over height was observed. This variation was caused by limited solar radiation for the lower leaves. The leaves that received full solar radiation had clear diurnal cycle in stomatal conductance and a high variation in stomatal conductance. In water-stressed conditions, it is expected to see a change in stomatal behaviour in these leaves.
For the leaf water potential, no values were reached that have been connected to water stress in the literature. Also, no water stress coping mechanisms were observed in the corn. From this it can be concluded that no water stress took place during this experiment for the days on which data was collected. In the leaf water potential data a clear influence of the soil water potential was observed. For the leaf water potential, no values were reached that have been connected to water stress in the literature. Also, no water stress coping mechanisms were observed in the corn. From this it can be concluded that no water stress took place during this experiment for the days on which data was collected. In the leaf water potential data a clear influence of the soil water potential was observed.
An additional objective was the development of a protocol for plant-water relation measurements in radar experiments.
Field experiments were done to measure the leaf water potential by conducting pre-dawn measurements three times a week, evening measurements once a week and a mid-day measurement in the beginning and at the end of the growing season. The stomatal conductance was measured multiple times per day for three days a week, given that there was no precipitation. As the research is part of a larger project, additional hydrological data, soilmoisture data and sap flow data were collected.
For the stomatal conductance a clear variation over height was observed. This variation was caused by limited solar radiation for the lower leaves. The leaves that received full solar radiation had clear diurnal cycle in stomatal conductance and a high variation in stomatal conductance. In water-stressed conditions, it is expected to see a change in stomatal behaviour in these leaves.
For the leaf water potential, no values were reached that have been connected to water stress in the literature. Also, no water stress coping mechanisms were observed in the corn. From this it can be concluded that no water stress took place during this experiment for the days on which data was collected. In the leaf water potential data a clear influence of the soil water potential was observed. For the leaf water potential, no values were reached that have been connected to water stress in the literature. Also, no water stress coping mechanisms were observed in the corn. From this it can be concluded that no water stress took place during this experiment for the days on which data was collected. In the leaf water potential data a clear influence of the soil water potential was observed.
Sustainable land and water management in Myanmar are desired since the country is rapidly changing. An analysis of the discharge data and an estimation on the groundwater recharge are desired to obtain this. In this paper, the discharge data of seven gauge stations in the Irrawaddy river are analyzed. Also, a method is described to estimate the groundwater recharge based on the Water Accounting + framework (WA+). This is done for the Irrawaddy basin in Myanmar upstream Pyay, and the Chindwin basin, which is part of the Irrawaddy basin. The groundwater recharge estimation is made with the use of remote sensing data, no ground measurements were needed for this. The method is based on the water balance and uses precipitation data (CHIRPS), actual evaporation data (ETensv1.0.) and output from the PCRaster Global Water Balance model. On a yearly basis, it is assumed that the change in storage is zero. Therefore, the annual discharge for the Chindwin basin and at Pyay could be used to validate the remote sensing precipitation minus evaporation. For the period 2005-2010 the 6-year average groundwater recharge is estimated to be 430-500 mm/year (20-23% of the rainfall) in the Chindwin basin and 340-400 mm/year (19-22% of the rainfall) for the Irrawaddy basin upstream Pyay. Most groundwater recharge takes place in the Northern part of Myanmar, as expected considering the high rainfall there. Some simplifications were made in the groundwater recharge estimation and the calculations were made on a cell basis. This is taken into account when determining the range. The method provided in this paper can be applied everywhere with remote sensing data. However, ground truth is recommended to validate the results.
...
Sustainable land and water management in Myanmar are desired since the country is rapidly changing. An analysis of the discharge data and an estimation on the groundwater recharge are desired to obtain this. In this paper, the discharge data of seven gauge stations in the Irrawaddy river are analyzed. Also, a method is described to estimate the groundwater recharge based on the Water Accounting + framework (WA+). This is done for the Irrawaddy basin in Myanmar upstream Pyay, and the Chindwin basin, which is part of the Irrawaddy basin. The groundwater recharge estimation is made with the use of remote sensing data, no ground measurements were needed for this. The method is based on the water balance and uses precipitation data (CHIRPS), actual evaporation data (ETensv1.0.) and output from the PCRaster Global Water Balance model. On a yearly basis, it is assumed that the change in storage is zero. Therefore, the annual discharge for the Chindwin basin and at Pyay could be used to validate the remote sensing precipitation minus evaporation. For the period 2005-2010 the 6-year average groundwater recharge is estimated to be 430-500 mm/year (20-23% of the rainfall) in the Chindwin basin and 340-400 mm/year (19-22% of the rainfall) for the Irrawaddy basin upstream Pyay. Most groundwater recharge takes place in the Northern part of Myanmar, as expected considering the high rainfall there. Some simplifications were made in the groundwater recharge estimation and the calculations were made on a cell basis. This is taken into account when determining the range. The method provided in this paper can be applied everywhere with remote sensing data. However, ground truth is recommended to validate the results.