Relationship between soil moisture and leaf water potential of three forest tree species

1983 ◽  
Vol 25 (6) ◽  
pp. 462-467 ◽  
Author(s):  
J. Huzulák ◽  
F. Matejka
Keyword(s):  
Soil Moisture ◽  
Water Potential ◽  
Leaf Water Potential ◽  
Tree Species ◽  
Forest Tree ◽  
Leaf Water ◽  
Forest Tree Species

Criteria for Scheduling the Irrigation of wheat

1981 ◽  
Vol 17 (2) ◽  
pp. 157-162 ◽  
Author(s):  
R. D. Misra ◽  
P. C. Pant
Keyword(s):  
Soil Moisture ◽  
Field Experiment ◽  
Water Potential ◽  
Leaf Water Potential ◽  
Sandy Loam ◽  
Leaf Water ◽  
Pan Evaporation ◽  
Loam Soil ◽  
Moisture Conditions ◽  
Better Than

SUMMARYA field experiment evaluating criteria for scheduling wheat irrigation was conducted from 1975 to 1977 in a sandy loam soil with treatments scheduled according to physiological stages, soil moisture conditions, pan evaporation and leaf water potential. Grain and straw yields, spikes/m, fertile spikelets/spike and number and weight of grains/spike were significantly influenced by treatments. Irrigation based on leaf water potential was as good as when based on physiological stages or soil moisture, and the use of pan evaporation was no better than other methods of scheduling.

scholarly journals Predictors and mechanisms of the drought-influenced mortality of tree species along the isohydric to anisohydic continuum in a decade-long study of a central US temperate forest

2015 ◽  
Vol 12 (2) ◽  
pp. 1285-1325 ◽  
Author(s):  
L. Gu ◽  
S. G. Pallardy ◽  
K. P. Hosman ◽  
Y. Sun
Keyword(s):  
Water Potential ◽  
Leaf Water Potential ◽  
Tree Species ◽  
Tree Mortality ◽  
Leaf Water ◽  
Extreme Drought ◽  
Positive Temperature ◽  
Drought Intensity ◽  
Predawn Leaf Water Potential ◽  
Annual Variations

Abstract. Using decade-long continuous observations of tree mortality and predawn leaf water potential (ψpd) at the Missouri Ozark AmeriFlux (MOFLUX) site, we studied how the mortality of important tree species varied along the isohydric to anisohydric continuum and how such variations may be predicted. Water stress determined inter-annual variations in tree mortality with a time delay of one year or more, which was predicted by predawn leaf water potential integral (PLWPI), mean effective precipitation interval (a time period with no daily precipitation rates exceeding a threshold) with a daily threshold precipitation at 5 mm day−1 (MEPI5), and precipitation variability index (PVI). Positive temperature anomaly integral (PTAI) and vapor pressure deficit integral (VPDI) also worked reasonably well, particularly for moderate droughts. The extreme drought of the year 2012 drastically increased the mortality of all species in the subsequent year. Regardless of the degree of isohydry and drought intensity, the ψpd of all species recovered rapidly after sufficiently intense rain events. This, together with a lack of immediate leaf and branch desiccation, suggests that hydraulic disconnection in the xylem was absent even during extreme drought and tree death was caused by significant but indirect effects of drought. We also found that species occupying middle positions along the isohydric to anisohydric continuum suffered less mortality than those at either extremes (i.e. extremely isohydric or extremely anisohydric). Finally, our study suggested that species differences in mortality mechanisms can be overwhelmed and masked in extreme droughts and should be examined in a broad range of drought intensity.

scholarly journals AN EVALUATION OF DIFFERENT MULCHES USED IN SOIL MOISTURE CONSERVATION OF COCONUT LANDS

CORD ◽  
1998 ◽  
Vol 14 (02) ◽  
pp. 34
Author(s):  
Vidhana Arachchi L P
Keyword(s):  
Soil Moisture ◽  
Water Potential ◽  
Leaf Water Potential ◽  
Bare Soil ◽  
Leaf Water ◽  
Dry Period ◽  
Water Losses ◽  
Different Types ◽  
Ecological Region ◽  
Soil Moisture Status

An investigation on the ability ofdifferent types of mulches to conserve soil moisture and their effect on coconutpalm (Dwarfx Tall; CRIC 65) was carried out in Madampe soil series at Bandirripuwa Estate, Lunuwila located in agro ecological region of IL3 of Sri Lanka. Different types ofmulches compared in this study were dried coconut fronds and leaves, cover crop with Pueraria phasioloides and Brachiaria milliformis versus bare soil (Control). Soil moisture status was monitored using the neutron scattering technique. Leaf water potential of coconut with respect to different treatments was also monitored during dryperiod   Results showed that Brachiaria milliformis and Pueraria phasioloides extracted significantly (p<0.001) more waterfrom soils than diied mulch and the control. The amount of water extracted in the above treatments were 74.4Yo, 62.5Yo, 59.79yo and 61.3% respectively. However, the extraction was not significantly different when the rainfall was greater than 100 mm. About 33 mm of water retained in Brachiaria milliformis introduced soil profiles even by the end of dry period Water losses by Pueraria phasioloides grown plots, specially through evapotranspiration, were 1higher in initial stages of the dry period, but later stage losses were lower than that of Brachiaria due to defoliation of Pueraria leaves during severe dry period Leaf water potential of coconut with respect to stress conditions of different treatments revealed that Pueraria phasioloides and Brachiaria milliformis did not adversely affect coconut palm grown in Madampe series, although those live materials extracted more waterfrom soilprofile compared to the other treatments. In general, dry mulching wasfound to be the most efficient moisture conservative practice that can be adoptedfor coconut lands.

Plant hydraulics accentuates the effects of atmospheric moisture stress on transpiration

2020 ◽  
Author(s):  
Alexandra Konings ◽  
Yanlan Liu ◽  
Mukesh Kumar ◽  
Xue Feng ◽  
Gabriel Katul
Keyword(s):  
Soil Moisture ◽  
Water Potential ◽  
Leaf Water Potential ◽  
Moisture Stress ◽  
Hydraulic Model ◽  
Leaf Water ◽  
Empirical Approach ◽  
Joint Control ◽  
Atmospheric Moisture ◽  
Plant Hydraulics

&lt;p&gt;Transpiration directly links the water, energy and carbon cycles. It is commonly restricted by soil (through soil moisture) and atmospheric (through vapor pressure deficit, VPD) moisture stresses governed by the movement of water through plants, also known as plant hydraulics. These sources of moisture stress are likely to diverge under climate change, with globally enhanced VPD due to increased air temperatures but more variable and uncertain changes in soil moisture. In most Earth system and land surface models, the ET response to each of the two stresses is evaluated through independent empirical relations, while neglecting plant hydraulics. Comparison of these two models is challenged by the difficulty of ensuring any perceived differences are due to the model structure, not an imperfect parametrization. Here, we use a model-data fusion approach applied to long-term ET records collected at 40 sites across a diverse range of biomes to demonstrate that the widely used empirical approach underestimates ET sensitivity to VPD, but compensates by overestimating the sensitivity to soil moisture stress. The bias originates from the joint control of leaf water potential on plant response to soil moisture and VPD stress. To a lesser degree, it also overestimates from increased sensitivity to VPD under dry (low leaf water potential) conditions in the plant hydraulic model. As a result, a hydraulic model captures ET under high-VPD conditions for wide-ranging soil moisture states better than the empirical approach does. Our findings highlight the central role of plant hydraulics in regulating the increasing importance of atmospheric moisture stress on biosphere-atmosphere interactions under elevated temperatures.&lt;/p&gt;

scholarly journals Terrestrial Laser Scanning Intensity Captures Diurnal Variation in Leaf Water Potential

2020 ◽  
Author(s):  
Samuli Junttila ◽  
Teemu Hölttä ◽  
Eetu Puttonen ◽  
Masato Katoh ◽  
Mikko Vastaranta ◽  
...  
Keyword(s):  
Diurnal Variation ◽  
Water Potential ◽  
Leaf Water Potential ◽  
Tree Species ◽  
Laser Scanning ◽  
Terrestrial Laser Scanning ◽  
Leaf Water ◽  
Water Dynamics ◽  
Plant Water ◽  
Plant Mortality

Drought-induced plant mortality has increased globally during the last decades and is forecasted to influence global vegetation dynamics. Timely information on plant water dynamics is essential for understanding and anticipating drought-induced plant mortality. The most common metric that has been used for decades for measuring water stress is leaf water potential (&Psi;L), which is measured destructively. To obtain information on water dynamics from trees and forested landscapes, remote sensing methods have been developed. However, the spatial and temporal resolution of the existing methods have limited our understanding of water dynamics and diurnal variation of &Psi;L within single trees. Thus, we investigated the capability of terrestrial laser scanning (TLS) intensity in observing diurnal variation in &Psi;L during a 50 hour monitoring period and aimed to improve understanding on how large part of the diurnal variation in &Psi;L can be captured using intensity observations. We found that TLS intensity at 905 nm wavelength was able to explain 78% of the variation in &Psi;L for three trees of two tree species with a root-mean square error of 0.137 MPa. Based on our experiment with three trees, time-series of TLS intensity measurements can be used in detecting changes in &Psi;L, and thus it is worthwhile to expand the investigations to cover a wider range of tree species and forests and further increase our understanding of plant water dynamics at wider spatial and temporal scales.

scholarly journals LEAF WATER POTENTIAL OF THE PURPLE ELEPHANT GRASS, PENNISETUM PURPUREUM SCHUMACH. (POACEAE) AND IT�S RELATIONSHIP WITH SOIL MOISTURE

2018 ◽  
Vol 11 (22) ◽  
pp. 1-7
Author(s):  
Euriel Mill�n-Romero ◽  
Andr�s Mass-Cruz ◽  
Yerye Chajin-Salcedo ◽  
Carlos Mill�n-P�ramo ◽  
◽  
...  
Keyword(s):  
Soil Moisture ◽  
Water Potential ◽  
Leaf Water Potential ◽  
Leaf Water ◽  
Pennisetum Purpureum ◽  
Elephant Grass
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