Wyniki wyszukiwania - BazTech

1

Experimental and numerical investigation on runoff reduction and water stress of green roofs with varying soil depth and saturated water content under dry–wet cycles

Ma Ming, Wang Jun, Garg Ankit, Mei Guoxiong

Acta Geophysica

|

2023

|

Vol. 71, no. 2

893--903

EN

The soil layer is the most important structure for green roof runoff reduction and vegetation growth. The mechanisms of runoff reduction and water content of green roofs with varying soil depth and saturated water content (θs) under dry–wet cycles are not well understood. Field and numerical methodologies were adopted for investigation in this study. The green roof drainage and water content were observed for a given period (i.e., August 2020 to July 2021). A numerical model was calibrated and validated for the analysis of annual runoff reduction and water stress with different θs and soil depths. Based on climate in southern China, the green roof's annual runoff reduction rate (ARR) (100 mm soil) was 33%, and the annual water stress was 168 days. With an increase in θs by 0.1 mm3 /mm3 , the ARR of green roofs increased by an average of 5% while the water stress was reduced by an average of 32 days. With an increase in soil depth by 100 mm, the average ARR increased by 4%, whereas the average water stress was reduced by 6 days. It was shown that the runoff reduction is enhanced with an increasing θs and soil depth during a longer antecedent dry weather period, but it had no significant effect on runoff reduction during back-to-back rainfall events. Increasing soil depth had no significant improvement in runoff reduction and water stress beyond a certain point. Consequently, the optimal structural configuration of green roofs was considered as a soil depth of 200 mm (θs of 0.5 mm3 /mm3 ).

2

Ponowne wprowadzanie i wykorzystanie wody

Zimoch I., Mulik B.

Wodociągi - Kanalizacja

|

2018

|

nr 4

14--16

3

Reakcja roślin ziemniaka napromieniowanych mikrofalami na symulowany stres suszy

Jakubowski T.

Inżynieria Rolnicza

|

2009

|

R. 13, nr 8

15-21

PL

W pracy przedstawiono wyniki trzyletniego doświadczenia dotyczącego reakcji roślin ziemniaka bardzo wczesnej odmiany Felka Bona, których sadzeniaki napromieniowano mikrofalami, na symulowany stres wodny w warunkach tunelu foliowego. Wyniki badań wskazują, że promieniowanie mikrofalowe istotnie modyfikuje strukturę plonu roślin ziemniaka w warunkach stresu suszy.

EN

The paper presents results of a three-year experiment on the reaction of potato plants belonging to a very early variety - Felka Bona, to simulated water stress in foil tunnel conditions. Seed potatoes of the plants were irradiated with microwaves. Research results indicate that microwave radiation substantially modifies the structure of potato plant crop in drought stress conditions.

4

Water requirements of two landscape tree species Prosopis glandulosa (D.C.) and Conocarpus erectus (L.) grown in arid regions

Moftah A., Al-Ghanim W.

Polish Journal of Ecology

|

2008

|

Vol. 56, nr 2

217-226

EN

Six-month-old honey mesquite (Prosopis glandulosa DC) and buttonwood (Conocarpus erectus L.) tree seedlings were grown under different soil water potentials ([psi]soil) in order to determine the minimum soil water potential at which both species can survive and grow fairly well, and to study the soil-plant water relationship at different irrigation regimes. The results showed that growth of Prosopis was not affected significantly until soil water potential was lower than -0.12MPa, while growth of Conocarpus seedlings was affected at water potential of about -0.08MPa, below which, plant height, leaf area and shoot and root dry weights were severely reduced by soil water deficit. Water stress decreased osmotic potential ([psi][pi]) of leaves and roots of both species, however the decrease in [psi][pi] of Conocarpus leaves and roots were much more pronounced (10.15%, resp.) than that of Prosopis. Leaves tended to osmoregulate their cell sap through osmotic adjustment as their content of soluble sugars increased, which occurred in Prosopis at water stress higher than that needed for Conocarpus. The satisfying survival under low [psi]soil could be related to increased osmotic adjustment. [psi]soil values seem to be a more useful tool than the field capacity values to estimate plant water requirements and can be used over an extended period of time, for plant grown under different soil types and different environmental conditions. The study indicates that Conocarpus seedlings can withstand reasonable water stress and can survive at moderately low water potential, but can not be classified as a high drought tolerant or resistant species, while Prosopis can survive at an extremely low water potential and may be classified as a drought tolerant species.

5

Reakcja komonicy zwyczajnej (Lotus corniculatus L.) uprawianej na glebie mineralnej i organicznej na stres wodny

Olszewska M.

Woda-Środowisko-Obszary Wiejskie

|

2004

|

T. 4, z. 2b

185-193

PL

W dwóch doświadczeniach szklarniowych badano reakcję komonicy zwyczajnej (Lotus corniculatus L.) odmiany Skrzeszowicka na stres wodny. W pierwszym doświadczeniu wazony wypełniono glebą mineralną, w drugim zaś organiczną. Wilgotność gleby mineralnej utrzymywano na poziomie 35 i 70% PPW, natomiast organicznej na poziomie 40 i 80% PPW. W okresie wegetacji mierzono intensywność fotosyntezy (urządzeniem do pomiaru parametrów wymiany gazowej Li-Cor) oraz indeks zieloności liści (chlorofilometrem SPAD). Rośliny ścinano trzykrotnie. Uzyskaną biomasę poddano analizie chemicznej. Wyniki badań wykazały, że stres wodny istotnie ograniczał intensywność fotosyntezy i plonowanie roślin oraz zwiększał ilość chlorofilu w liściach komonicy zwyczajnej. Stwierdzono istotną dodatnią korelację między intensywnością fotosyntezy a plonem suchej masy i ujemną korelację między indeksem zieloności liści SPAD a intensywnością fotosyntezy. Gleba, na której uprawiano komonicę zwyczajną, wpływała na intensywność fotosyntezy, plonowanie i skład chemiczny roślin, nie miała natomiast wpływu na zawartość chlorofilu wyrażoną jako indeks zieloności liści SPAD.

EN

The response of Lotus corniculatus L. var. Skrzeszowicka to water stress was studied in two greenhouse experiments. In the first experiment the pots were filled with mineral soil, and in the other - with organic soil. Mineral soil humidity was 35 and 70% field water capacity, and organic soil humidity - 40 and 80% field water capacity. During the vegetation period the rate of photosynthesis was determined with an apparatus for measuring gas exchange parameters Li-Cor, and the leaf greenness index - with a SPAD c hlorophyll meter. The plants were cut three times. Obtained biomass was subjected to chemical analysis. The results showed that water stress considerably reduced the rate of photosynthesis and plant yield, and increased the chlorophyll content of Lotus corniculatus L. leaves. There was a significant positive correlation between the rate of photosynthesis and dry matter yield, and a negative correlation between the leaf greenness index (SPAD) and the rate of photosynthesis. Soil type affected the rate of photosynthesis, yield and chemical composition of plants but had no influence on the chlorophyll content expressed as the leaf greenness index (SPAD).