scholarly journals Drought resistance of two Douglas fir species (Pseudo- tsuga menziesii (Mirb.) Franco and Pseudotsuga macro- carpa (Torr.) Mayr.): relative importance of water use efficiency and root growth potential

1989 ◽  
Vol 46 (Supplement) ◽  
pp. 384s-387s ◽  
Author(s):  
G. Aussenac ◽  
P. Grieu ◽  
J. M. Guehl
Keyword(s):  
Root Growth ◽  
Water Use Efficiency ◽  
Water Use ◽  
Drought Resistance ◽  
Douglas Fir ◽  
Growth Potential ◽  
Relative Importance ◽  
Root Growth Potential ◽  
Use Efficiency

Carbohydrate reserves and root growth potential in Douglas-fir seedlings before and after cold storage

1982 ◽  
Vol 12 (4) ◽  
pp. 905-912 ◽  
Author(s):  
Gary A. Ritchie
Keyword(s):  
Root Growth ◽  
Cold Storage ◽  
Drought Resistance ◽  
Dry Weight ◽  
Douglas Fir ◽  
Growth Potential ◽  
Frost Hardiness ◽  
Root Growth Potential ◽  
Carbohydrate Reserves ◽  
Before And After

Carbohydrate reserves and root growth potential (RGP) of 2 + 0 Douglas-fir (Pseudotsugamenziesii (Mirb.) Franco) seedlings were monitored through a lifting season and during dark, cold storage. Concentrations of total nonstructural carbohydrate and extractable sugars in root and stem tissues remained relatively constant through winter, while foliar sugars showed a sharp midwinter peak at about 195 mg•g−1 dry weight. RGP was lowest in November and March and peaked in January. During storage at +2 and −1 °C, carbohydrates were depleted in all tissues through respiratory consumption. In contrast, RGP increased during the first 6 months in storage and then fell rapidly. The results do not support the view that changes in RGP are driven by changes in carbohydrate concentrations. Storage may affect frost hardiness and drought resistance through its effect on sugar concentrations.

scholarly journals Root Growth Potential and Microsite Effects on Conifer Seedling Establishment in Northern Idaho

Forests ◽  
2021 ◽  
Vol 12 (5) ◽  
pp. 597
Author(s):  
Jacob A. Reely ◽  
Andrew S. Nelson
Keyword(s):  
Root Growth ◽  
Douglas Fir ◽  
Seedling Quality ◽  
Growth Potential ◽  
Larix Occidentalis ◽  
Root Growth Potential ◽  
Western Larch ◽  
Neighborhood Conditions ◽  
Seedling Performance ◽  
Survival And Growth

Environmental conditions and seedling quality interact to produce complex patterns of seedling survival and growth. Root growth potential (RGP) is one metric of seedling quality that can be rapidly measured prior to planting, but the correlation of RGP and seedling performance is not consistent across studies. Site factors including microsite objects that cast shade and competing vegetation can also influence seedling performance. We examined the effects of RGP, presence/absence of a microsite object, and competition cover on the survival and growth of three native conifers to the Inland Northwest, USA, over 5 years. We found that RGP had no effect on the survival or growth of western larch (Larix occidentalis), Douglas fir (Pseudotsuga menziesii var. glauca), and grand fir (Abies grandis) at a mesic north aspect site and a xeric south aspect site. Comparatively, the presence of a microsite increased the odds of survival by 37% for western larch and 158% for grand fir, while the absence of forb cover increased the odds of survival of western larch by 72% and of grand fir by 26%. Douglas fir was less sensitive to microsites and competition. The strong effects of neighborhood conditions around seedlings help inform silvicultural practices to enhance the establishment of western larch and grand fir, including planting seedlings near shading objects and competition control, while these practices may not be as important for Douglas fir.

Effects of Water Retaining Agent on the Growth and Water Use Efficiency of Hemarthria compressa

2013 ◽  
Vol 864-867 ◽  
pp. 2236-2239
Author(s):  
Jun Ying Jin ◽  
Wei Hua Zhang ◽  
Bao Chang
Keyword(s):  
Water Use Efficiency ◽  
Water Use ◽  
Drought Resistance ◽  
Normal Growth ◽  
Proline Content ◽  
Chlorophyll Contents ◽  
Physiological Indices ◽  
Use Efficiency ◽  
Hemarthria Compressa ◽  
Maximum Threshold

The application of water retaining agent could evidently improve water use efficiency. The WUE was increased with the duration of using water retaining agent, compared with the control, it increased 5 to 11 times with the duration of 8 to16d, and the growth (eg. height, the ratio of shoot to root, and yield et al) and physiological indices (eg. root activities and chlorophyll contents) were not affected. Moreover, compared with the control, the proline content increased 3 times, which showed that the application of water retaining agent improve the drought resistance, and the maximum threshold was 16d for keeping the normal growth of Hemarthria compressa in this study.

scholarly journals Vegetable Grafting as a Tool to Improve Drought Resistance and Water Use Efficiency

2017 ◽  
Vol 8 ◽  
Author(s):  
Pradeep Kumar ◽  
Youssef Rouphael ◽  
Mariateresa Cardarelli ◽  
Giuseppe Colla
Keyword(s):  
Water Use Efficiency ◽  
Water Use ◽  
Drought Resistance ◽  
Use Efficiency

Evapotranspiration and water use efficiency in different-aged Pacific Northwest Douglas-fir stands

2009 ◽  
Vol 149 (6-7) ◽  
pp. 1168-1178 ◽  
Author(s):  
Rachhpal S. Jassal ◽  
T. Andrew Black ◽  
David L. Spittlehouse ◽  
Christian Brümmer ◽  
Zoran Nesic
Keyword(s):  
Water Use Efficiency ◽  
Pacific Northwest ◽  
Water Use ◽  
Douglas Fir ◽  
Use Efficiency
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