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Are phenolic compounds released from the Mediterranean shrub Cistus albidus responsible for changes in N cycling in siliceous and calcareous soils?
Author(s) -
Castells Eva,
Peñuelas Josep,
Valentine David W.
Publication year - 2004
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.2004.01021.x
Subject(s) - mineralization (soil science) , soil water , cycling , nitrification , calcareous , chemistry , environmental chemistry , nitrogen cycle , botany , nitrogen , biology , ecology , history , archaeology , organic chemistry
Summary• We studied the effects of Cistus albidus leaf leachates on nitrogen‐cycling processes in two siliceous soils (granite and schist) and one calcareous soil. We compared those effects with gross N‐transformation rates in soils sampled underneath Cistus . • Soils amended with leachates and soils sampled under Cistus had higher NH 4 + immobilization and lower nitrification compared with control soils. Gross N mineralization increased under Cistus but decreased in soils amended with leachates. These effects were especially strong in granite soil. • To determine whether phenolic compounds were causing those effects, we incubated granite soils with leachate and a leachate fraction containing only nonphenolic compounds. Nonphenolic compounds increased NH 4 + immobilization and decreased gross nitrification, while decreases in gross N mineralization were estimated to be caused by phenolic compounds. • Our results show that although phenolic compounds leached from green foliage changed gross N mineralization, their effects on net N rates were eclipsed by the changes produced by polar nonphenolic compounds such as carbohydrates. Plant nonphenolic compounds may drive N cycling under Cistus .