scholarly journals Experimental and simulated CO2 responses of photosynthesis in leaves of Hippophae rhamnoides L. under different soil water conditions

2019 ◽  
Author(s):  
Qin Wu ◽  
Cheng Li ◽  
Qiang Chen
Keyword(s):  
Soil Moisture ◽  
Soil Water ◽  
Hippophae Rhamnoides ◽  
Photosynthetic Parameters ◽  
Response Curves ◽  
Rectangular Hyperbola ◽  
Hippophaë Rhamnoides ◽  
Hilly Region ◽  
Water Conditions ◽  
Soil Water Conditions

AbstractCO2 concentrations and soil moisture conditions seriously affect tree growth and physiological mechanisms. CO2 responses of photosynthesis are an important part of plant physiology and ecology research. This study investigated the photosynthetic CO2 responses in the leaves of two-year-old Hippophae rhamnoides L. under eight soil water conditions in a semi-arid loess hilly region, and discussed the quantitative relationship between CO2 responses and soil moisture. CO2 response curves and parameters were fitted using a rectangular hyperbola model, non-rectangular hyperbola model, exponential equation, and modified rectangular hyperbola model. Results revealed that the relative soil water content (RWC) required to maintain a high photosynthetic rate (Pn) and carboxylation efficiency (CE) ranged from 42.8% to 83.2%. When RWC fell outside these ranges, the photosynthetic capacity (Pnmax), CE, and CO2 saturation point (CSP) decreased. CO2 response curves and three parameters, CE, CO2 compensation point (Γ), and photorespiration rate (Rp), were well fitted by the four models when RWC was appropriate. When RWC exceeded the optimal range, only the modified rectangular hyperbola model fitted the CO2 response curves and photosynthetic parameters better.

scholarly journals What Do Plants Leave after Summer on the Ground?—The Effect of Afforested Plants in Arid Environments

Water ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 2559
Author(s):  
César Dionisio Jiménez-Rodríguez ◽  
Miriam Coenders-Gerrits ◽  
Stefan Uhlenbrook ◽  
Jochen Wenninger
Keyword(s):  
Soil Moisture ◽  
Soil Water ◽  
Shaanxi Province ◽  
Hydraulic Lift ◽  
Soil Conditions ◽  
Arid Environments ◽  
Stable Water Isotopes ◽  
Water Conditions ◽  
Soil Water Conditions ◽  
Willow Trees

The implementation of afforestation programs in arid environments in northern China had modified the natural vegetation patterns. This increases the evaporation flux; however, the influence of these new covers on the soil water conditions is poorly understood. This work aims to describe the effect of Willow bushes (Salix psammophila C. Wang and Chang Y. Yang) and Willow trees (Salix matsudana Koidz.) on the soil water conditions after the summer. Two experimental plots located in the Hailiutu catchment (Shaanxi province, northwest China), and covered with plants of each species, were monitored during Autumn in 2010. The monitoring included the soil moisture, fine root distribution and transpiration fluxes that provided information about water availability, access and use by the plants. Meanwhile, the monitoring of stable water isotopes collected from precipitation, soil water, groundwater and xylem water linked the water paths. The presence of Willow trees and Willow bushes reduce the effect of soil evaporation after summer, increasing the soil moisture respect to bare soil conditions. Also, the presence of soil water with stable water isotope signatures close to groundwater reflect the hydraulic lift process. This is an indication of soil water redistribution carried out by both plant species.

RESPONSE OF PEAS TO ENVIRONMENT: IV. EFFECT OF FIVE SOIL WATER REGIMES ON GROWTH AND DEVELOPMENT OF PEAS

1968 ◽  
Vol 48 (2) ◽  
pp. 129-137 ◽  
Author(s):  
A. R. Maurer ◽  
H. F. Fletcher ◽  
D. P. Ormrod
Keyword(s):  
Water Stress ◽  
Soil Water ◽  
Growth And Development ◽  
Dry Matter ◽  
Fresh Weight ◽  
Water Regimes ◽  
Severe Water Stress ◽  
Water Conditions ◽  
Before And After ◽  
Soil Water Conditions

Pea plants growing in "weighing lysimeters" were subjected to five soil-water regimes to determine their response to varying conditions of soil water imposed at different stages of development. Plants subjected to a minimal water stress developed luxuriantly and continued to grow up to the harvest period. Pea yield and plant height were not reduced, but fresh weight and dry matter were less if irrigation was applied when soil water fell to 60% rather than 88% of that available. A severe water stress after blossom reduced pea yield, irrespective of soil-water conditions prior to blossom. Plants which had been given ample soil water before blossom wilted visibly when a severe stress was imposed in the post-blossom period, yet wilting did not occur in plants subjected to severe water stress both before and after blossom. Severe water stress prior to blossom did not cause a decrease in pea yield if ample soil moisture was made available after blossom.

scholarly journals ОКРЕМІ ПИТАННЯ АНАЛІЗУ УШКОДЖЕНЬ БУДІВЕЛЬНИХ ОБ’ЄКТІВ ВЕЛИКОЇ ПЛОЩІ

2018 ◽  
pp. 356-364
Author(s):  
Марек Дохойда ◽  
Йоанна Вітковска-Добрев
Keyword(s):  
Soil Water ◽  
Expansion Joints ◽  
Concrete Shrinkage ◽  
Design And Implementation ◽  
Water Conditions ◽  
Complex Engineering ◽  
Soil Water Conditions ◽  
Bottom Slab

У роботі представлений перелік проблем, що супроводжують будівельні об'єкти великої площі, в тому числі й підземні гаражі. Здійснено технічний аналіз окремих проблем, що виникають в таких будівлях під час їх експлуатації. Проектування, а пізніше і будівництво підземних гаражів найчастіше, пов'язане з вирішеням складних інженерних питань. Згідно з ними до найпоширеніших конструкційних недоліків у підземних гаражах віднесні: тріщини нижньої плити, порушення поверхових перекриттів, невластиве кручення бетону, відсутність дилатації або також помилково прийняті ґрунтово-водні умови.The paper concerns complex engineering challenges associated with multi-storey underground car parks. An analysis of selected issues in underground garages during the exploitation was performed. The design and implementation of structures of which function are underground garages is most often associated with serious engineering challenges. For structural reasons frequently occurring faults in garages may include fracture of the bottom slab and intermediate floors resulting from improper design of reinforcement, concrete shrinkage, lack of expansion joints or incorrectly adopted soil-water conditions.

scholarly journals Soil water Conditions and The Root Distribution of Salix matsudana in The Mu Us Desert, China

1987 ◽  
Vol 51 (5) ◽  
pp. 126-131
Author(s):  
Takuro MASUDA ◽  
Tatsuaki KOBAYASHI ◽  
Yukihiro MORIMOTO ◽  
Ken YOSIKAWA
Keyword(s):  
Soil Water ◽  
Root Distribution ◽  
Mu Us Desert ◽  
Water Conditions ◽  
Salix Matsudana ◽  
Soil Water Conditions

Effects of zinc fertilizer on maize yield and water-use efficiency under different soil water conditions

2020 ◽  
Vol 248 ◽  
pp. 107718 ◽  
Author(s):  
Li Zhang ◽  
Minfei Yan ◽  
Hongbing Li ◽  
Yuanyuan Ren ◽  
Kadambot HM Siddique ◽  
...  
Keyword(s):  
Water Use Efficiency ◽  
Soil Water ◽  
Water Use ◽  
Maize Yield ◽  
Water Conditions ◽  
Zinc Fertilizer ◽  
Use Efficiency ◽  
Soil Water Conditions

Modeling Soybean Leaf‐Water Potentials Under Nonlimiting Soil Water Conditions 1

1981 ◽  
Vol 73 (2) ◽  
pp. 251-254 ◽  
Author(s):  
C. D. Stanley ◽  
T. C. Kaspar ◽  
H. M. Taylor
Keyword(s):  
Soil Water ◽  
Leaf Water ◽  
Water Potentials ◽  
Water Conditions ◽  
Soybean Leaf ◽  
Soil Water Conditions

scholarly journals Root responses of Siberian larch to different soil water conditions

2011 ◽  
Vol 5 ◽  
pp. 93-97 ◽  
Author(s):  
Mie Miyahara ◽  
Chisato Takenaka ◽  
Rie Tomioka ◽  
Takeshi Ohta
Keyword(s):  
Soil Water ◽  
Siberian Larch ◽  
Water Conditions ◽  
Root Responses ◽  
Soil Water Conditions

Shoot hydraulic characteristics, plant water status and stomatal response in olive trees under different soil water conditions

2013 ◽  
Vol 373 (1-2) ◽  
pp. 77-87 ◽  
Author(s):  
J. M. Torres-Ruiz ◽  
A. Diaz-Espejo ◽  
A. Morales-Sillero ◽  
M. J. Martín-Palomo ◽  
S. Mayr ◽  
...  
Keyword(s):  
Soil Water ◽  
Water Status ◽  
Plant Water Status ◽  
Plant Water ◽  
Stomatal Response ◽  
Hydraulic Characteristics ◽  
Water Conditions ◽  
Olive Trees ◽  
Soil Water Conditions
Sign in / Sign up

Export Citation Format

Share Document