Aboveground net production and dry matter allocation of Pinus pumila forests in the Kiso mountain range, central Japan

1994 ◽  
Vol 9 (2) ◽  
pp. 193-204 ◽  
Author(s):  
Takuya Kajimoto
Keyword(s):  
Dry Matter ◽  
Mountain Range ◽  
Pinus Pumila ◽  
Central Japan ◽  
Net Production ◽  
Dry Matter Allocation

Needle browning and death in Pinus pumila in the alpine region of central Japan were not related to mechanical damage of cuticle and cuticle thickness

2012 ◽  
Vol 42 (1) ◽  
pp. 167-178 ◽  
Author(s):  
Aoi Nakamoto ◽  
Takefumi Ikeda ◽  
Emiko Maruta
Keyword(s):  
Natural Environment ◽  
Mechanical Damage ◽  
Early Spring ◽  
Alpine Region ◽  
Pinus Pumila ◽  
Central Japan ◽  
Alpine Regions ◽  
Cuticle Thickness ◽  
Cuticular Resistance ◽  
Evergreen Conifers

The browning and death of needles of evergreen conifers in alpine regions occur mainly in early spring at the point where the shoot protrudes from the snowpack. They are thought to be caused by excessive transpiration due to mechanical damage to the cuticle or to a thinner cuticle. However, there are a few studies that do not necessarily agree with this idea. We assessed needle browning and death in Pinus pumila (Pallas) Regel. in the alpine region of Japan in relation to mechanical damage to the cuticle, cuticular resistance, and cuticle thickness. Mechanical damage was not observed on needle cuticles of Pinus pumila browning in a natural environment. The color of needles with artificially abraded cuticles changed from green to brown in the abraded part. However, the brown color at the abraded part differed from the brown of a browning needle in its natural environment. There was no correlation between cuticular resistance and cuticle thickness. Needle browning and death in P. pumila were not related to mechanical damage of the cuticle or to cuticle thickness but might be due to changes in the quality and structure of the cuticle and other stresses.

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