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- Title
Foliar free polyamine and inorganic ion content in relation to soil and soil solution chemistry in two fertilized forest stands at the Harvard Forest, Massachusetts
- Authors
Magill, Alison H.; Long, Stephanie; Minocha, Rakesh; McDowell, William H.; Aber, John
- Abstract
Polyamines (putrescine, spermidine, and spermine) are low molecular weight, open-chained, organic polycations which are found in all organisms and have been linked with stress responses in plants. The objectives of our study were to investigate the effects of chronic N additions to pine and hardwood stands at Harvard Forest, Petersham, MA on foliar polyamine and inorganic ion contents as well as soil and soil solution chemistry. Four treatment plots were established within eachstand in 1988: control, low N (50 kg N ha-1 yr-1 as NH4NO3), low N + sulfur (74 kg S ha-1 yr-1 as Na2SO4), and high N (150 kg N ha-1 yr-1 as NH4NO3). All samples were analyzed for inorganic elements; foliage samples were also analyzed for polyamines and total N. In the pine stand putrescine and total N levels in the foliage were significantly higher for all N treatments as compared to the control plot. Total N content was positively correlated with polyamines in the needles (P ≤ 0.05). Both putrescine and N contents were also negatively correlated with most exchangeable cations and total elements in organic soil horizons and positively correlated with Ca and Mg in the soil solution (P≤ 0.05). In the hardwood stand, putrescine and total N levels in the foliage were significantly higher for the high N treatment only ascompared to the control plot. Here also, total foliar N content was positively correlated with polyamines (P ≤ 0.05). Unlike the case with the pine stand, in the hardwood stand foliar polyamines and N were significantly and negatively correlated with foliar total Ca, Mg, and Mn (P ≤ 0.05). Additional significant (P ≤ 0.05) relationshipsin hardwoods included: negative correlations between foliar polyamines and N content to exchangeable K and P and total P in the organic soil horizon; and positive correlations between foliar polyamines and N co
- Subjects
MASSACHUSETTS; UNITED States; SOILS; SOIL science; PLANT nutrition; BOTANY; SOIL chemistry
- Publication
Plant & Soil, 2000, Vol 222, Issue 1/2, p119
- ISSN
0032-079X
- Publication type
Article