Seasonal variation in the atmospheric deposition of inorganic constituents and canopy interactions in a Japanese cedar forest.
The seasonal changes in throughfall (TF) and stemflow (SF) chemistry and the canopy interactions of K+ and N compounds were studied in a Japanese cedar forest near the Sea of Japan. The fluxes of most ions, including non-sea-salt SO4(2-), from TF, SF, and rainfall showed distinct seasonal trends, increasing from autumn to winter, owing to the seasonal west wind, while the fluxes of NH4+ and K+ ions from TF+SF might have a large effect of canopy interactions. The contact angle (CA) of water droplets on leaves decreased with leaf aging, suggesting that surface wettability increases with leaf age. The K+ concentration in TF was negatively correlated with the CA of 1-year-old leaves, while the NH4+ concentration was positively correlated with the CA. The net fluxes of NH4+ and NO3(-) from TF were positively correlated with the CA. The increase in wettability may accelerate leaching of K+ or uptake of NH4+.
Sase
Hiroyuki
H
Ecological Impact Research Department, Acid Deposition and Oxidant Research Center, 1182 Sowa, Nishi-ku, Niigata 950-2144, Japan. sase@adorc.gr.jp
Takahashi
Akiomi
A
Sato
Masahiko
M
Kobayashi
Hiroyasu
H
Nakata
Makoto
M
Totsuka
Tsumugu
T
D000327:Adsorption; D000393:Air Pollutants / Q000032:analysis*; D032485:Cryptomeria; D004784:Environmental Monitoring / Q000379:methods*; D007564:Japan; D008855:Microscopy, Electron, Scanning; D009573:Nitrites / Q000032:analysis; D009584:Nitrogen / Q000032:analysis; D018515:Plant Leaves / Q000502:physiology / Q000648:ultrastructure; D018547:Plant Stems / Q000378:metabolism; D011188:Potassium / Q000032:analysis; D000644:Quaternary Ammonium Compounds / Q000032:analysis; D011891:Rain; D012621:Seasons; D014197:Trees; D017155:Wettability; D014919:Wind
D000393:Air Pollutants; D009573:Nitrites; D000644:Quaternary Ammonium Compounds; D009584:Nitrogen; D011188:Potassium