Lesson 32 Mineral Cycling - Alaska Geobotany Center
Lesson 32 Mineral Cycling - Alaska Geobotany Center
Lesson 32 Mineral Cycling - Alaska Geobotany Center
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Trends in potassium storage in plants and<br />
resorption of K over time at Hubbard Brook<br />
Rate of storage of K in living and dead biomass<br />
(mol ha -1 yr -1 ) and net soil release of K in<br />
Watershed 6 (control watershed at HBEF)<br />
Estimate of resorption of K in Watershed 6.<br />
• Potassium is a very mobile ion that is<br />
lost from the system through leaching<br />
if it is not captured by biomass.<br />
• Net soil release of K and storage of K<br />
in biomass declined markedly over 27<br />
years in Watershed 6 (control). In<br />
1987-1992 biomass assimilation of K<br />
was less than 17% of that in 1965-<br />
1977.<br />
• Concomitant with decline in rates of<br />
biomass assimilation, K in throughfall<br />
and biomass storage of K declined.<br />
• More of the available K was resorbed<br />
from leaves before they senesced and<br />
leaching of K declined.<br />
Likens, et al. 1994. Biogeochemisty 25: 61-125. Kluwer Academic Publishers
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