Tree shelters facilitate brown oak seedling survival and establishment in a grazing‐dominant forest of Bhutan, Eastern Himalaya

2020 ◽  
Vol 28 (5) ◽  
pp. 1145-1157
Author(s):  
Tshewang Dorji ◽  
José M. Facelli ◽  
Tshewang Norbu ◽  
Steven Delean ◽  
Justin D. Brookes
Keyword(s):  
Seedling Survival ◽  
Eastern Himalaya ◽  
Tree Shelters

scholarly journals A Comparison of Seedling Growth and Light Transmission among Tree Shelters

2005 ◽  
Vol 22 (2) ◽  
pp. 102-110 ◽  
Author(s):  
Hailu Sharew ◽  
Anne Hairston-Strang
Keyword(s):  
Light Transmission ◽  
Seedling Survival ◽  
Flux Ratio ◽  
Height Growth ◽  
Photon Flux ◽  
Diameter Growth ◽  
Northern Red Oak ◽  
Green Ash ◽  
Tree Shelters ◽  
R Ratio

Abstract Survival, height, and diameter growth of seedlings were evaluated for three years after planting using five types of tree shelters and seven species: green ash (Fraxinus pennylvanica), northern red oak (Quercus rubra L.), pin oak (Q. palustris), American sycamore (Platanus occidentalis), black walnut (Juglans nigra L.), flowering dogwood (Cornus florida), and eastern white pine (Pinus strobus). Differences in shelter environments were measured, including: light transmission measured as percent photosynthetic photon flux, ratio of red:far red (r:f-r) light from the red and far-red wavelengths, and air temperature inside the tubes. The differences seen in seedling survival were not significant (p < 0.05) for the presence or type of tree tube, with an average survival of 96% for all but two species. For most species, seedlings grown in high light-transmitting tubes with proportional r:f-r ratio light showed superior height growth (e.g., Miracle Tube, Tree-Pro, and Protex). Diameter growth generally decreased in shelters. Sycamore showed no significant benefit from the use of tubes. The lowest diameter increments were seen using Tubex brown and Mesh Guard shelters, which had low light transmission with high r:f-r ratio and mechanical damage, respectively. Light transmission in translucent tree tubes was within the ranges found in open canopy forest, but the proportion of growth-promoting far-red wavelength was generally lower. In tubes with higher light transmission, r:f-r ratio is closer to natural ranges for that light level. For tubes with lower light transmissivity, this information suggests that seedling height growth might be improved if red wavelengths were blocked more strongly.North. J. appl. For. North. J. Appl. For. 22(2):102–110.

Exacum Tenue (blume) Klack. (Gentianaceae):A New Record for the Flora of Eastern Himalaya

Pleione ◽  
2017 ◽  
Vol 11 (2) ◽  
pp. 516
Author(s):  
Licha Jeri ◽  
Nazir Ahmad Bhat ◽  
Yogendra Kumar ◽  
Dilip Kr. Roy
Keyword(s):  
New Record ◽  
Eastern Himalaya

Screening of F1 progeny for selection of superior hybrids in mulberry (Morus spp.) - A simple approach PART I: Screening of seedlings in relation to seed size

2017 ◽  
Vol 6 (2) ◽  
pp. 5256
Author(s):  
Daryoush Shafiei ◽  
Prof. Basavaiah*
Keyword(s):  
Seed Size ◽  
Seedling Survival ◽  
Size Class ◽  
Medium Size ◽  
Screening Process ◽  
Size Classes ◽  
Morus Spp ◽  
In The Beginning ◽  
Selection Of ◽  
Size Grading

In mulberry (Morus spp.), the process of selection of promising hybrids from F1 population requires the screening of a large number of progenies and a long period. To develop a simple and faster approach for screening, studies were conducted using F1 seeds of two crosses. The details of screening studies conducted in relation to seed-size and seedling-size are reported separately in two parts. In this part, the F1 seeds were size-graded as small, medium and large seeds; their progenies were raised separately and screened in nursery. There was a considerable degree of variation in size of seeds and medium-size class seeds were in high percentage in both the crosses. The length, width and weight of seeds were also varied between the seed size classes significantly in both the crosses. The seed size classes differ with high significance in shoot length and Root collar diameter and also differ significantly in root length and weight of seedlings. The positive correlation between the seed size and growth of seedlings, seed size and germination, seed size and seedling survival in nursery indicated that size-grading of seeds and rejection of small seeds in the beginning of screening process may help to increase the efficiency of screening by increasing the chances of getting superior hybrids from limited progenies. However, confirmation on the performance of large seedlings from small seed size class may help to draw conclusion. Hence, the studies are continued with size- grading of seedlings in the next part of screening study.

Genus Entodon Müll. Hal. (Bryophyta) in Meghalaya

2016 ◽  
Vol 1 (1) ◽  
Author(s):  
A.K. Asthana ◽  
Ankita Srivastava
Keyword(s):  
New Record ◽  
Current Status ◽  
Eastern Himalaya

A recent study on the mosses of Meghalaya has revealed the occurrence of 6 taxa of the genus Entodon viz., E. concinnus (De Not.) Par. ssp. caliginosus (Mitt.) Mizushima, E. rubicundus (Mitt.) Jaeg., E. luridus (Griff.) Jaeg., E. plicatus C. Muell., E. scariosus Ren. & Card. and E. pulchellus (Griff.) Jaeg., out of which E. concinnus (De Not.) Par. ssp. caliginosus (Mitt.) Mizushima is a new addition to eastern Himalaya and E. scariosus is a new record to Meghalaya. Present paper provides the current status and morpho-taxonomic details of above mentioned species of Entodon in Meghalaya.

Genus Entodon Müll. Hal. (Bryophyta) in Meghalaya

2016 ◽  
Vol 1 (1) ◽  
Author(s):  
Ankita Srivastava ◽  
A.K. Asthana
Keyword(s):  
New Record ◽  
Current Status ◽  
Eastern Himalaya

<p>A recent study on the mosses of Meghalaya has revealed the occurrence of 6 taxa of the genus viz., Entodon E. concinnus (De Not.)<br />Par. ssp. caliginosus (Mitt.) Mizushima, E. rubicundus (Mitt.) Jaeg., E. luridus (Griff.) Jaeg., E. plicatus C. Muell., E. scariosus Ren. &amp;<br />Card. and E. pulchellus (Griff.) Jaeg., out of which E. concinnus (De Not.) Par. ssp. caliginosus (Mitt.) Mizushima is a new addition to<br />eastern Himalaya and E. scariosus is a new record to Meghalaya. Present paper provides the current status and morpho-taxonomic details<br />of above mentioned species of Entodon in Meghalaya.<br />Keywords: Meghalaya, eastern Himalaya, Entodon.</p><p> </p><p> </p><p><span>DOI: </span><a id="pub-id::doi" href="http://dx.doi.org/10.21756/cba.v1i1.11017">http://dx.doi.org/10.21756/cba.v1i1.11017</a></p>

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