Repositorio
Institucional

Stock, Svenja C.

Koester, Moritz

Najera, Francisco

Boy, Jens

Matus, Francisco

Merino, Carolina

Abdallah, Khaled

Spielvogel, Sandra

Gorbushina, Anna A.

Dippold, Michaela A.

Kuzyakov, Yakov

Vegetation strategies for nitrogen and potassium acquisition along a climate and vegetation gradient: From semi-desert to temperate rainforest

ELSEVIER

GEODERMA

en

Nutrient acquisition strategies of plants regulate water flow and mass transport within ecosystems, shaping earth surface processes. Understanding plant strategies under current conditions is important to assess and predict responses of natural ecosystems to future climate and environmental changes. Nitrogen (N) and potassium (K) (re-)utilization from topsoil and their acquisition from subsoil and saprolite were evaluated in a continental transect, encompassing three study sites - an arid shrubland, a mediterranean woodland, and a temperate rainforest - on similar granitoid parent material in the Chilean Coastal Cordillera. The short-term (< 1 year) plant N and K acquisition was traced with N-15 and the K analogs rubidium and cesium. To do so, the tracers were either injected into topsoil, subsoil, or saprolite, in the immediate vicinity of eight individual plants per study site and injection depth. The long-term (> decades) K uplift by plants was investigated by the vertical distribution of exchangeable K+ and Na+. Recoveries of N-15 and K analogs by arid shrubland plants were similar from topsoil, subsoil, and saprolite. Mediterranean woodland shrubs recovered the tracers primarily from topsoil (i.e., 89 % of recovered N-15 and 84 % of recovered K analogs). Forest plants recovered the tracers from topsoil (N-15 = 49 %, K analogs = 57 %) and partially from greater depth: 38 % of recovered N-15 and 43 % of recovered K analogs were acquired from subsoil and saprolite, respectively. Low nutrient accessibility in the topsoil (e.g., because of frequent droughts) drives shrubland plants to expand their N and K uptake to deeper and moister soil and saprolite. Woodland and forest plants dominantly recycled nutrients from topsoil. In the forest, this strategy was complemented by short-term uplift of N and K from depth. The vertical distribution of exchangeable K indicated long-term uplift of K by roots in all three sites. This highlighted that long-term K uplift from depth complements the nutrient budget across the continental transect.

artículo original

10.1016/j.geoderma.2022.116077

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Subsoil nutrient tracing

N-15 and K analog tracer

Nutrient uplift and recycling

Nutrient cycles

Chilean Coastal Cordillera

(semi)arid to humid-temperate natural ecosystems

PINE ARAUCARIA-ANGUSTIFOLIA

COASTAL CORDILLERA

HYDRAULIC REDISTRIBUTION

NUTRIENT ACQUISITION

GLOBAL PATTERNS

SOIL NUTRIENTS

ROOT ACTIVITY

PLANT

NITRATE

GROWTH

Ciencia del suelo

Seguimiento de nutrientes del subsuelo

Trazador analógico N-15 y K

Elevación y reciclaje de nutrientes

Ciclos de nutrientes

Cordillera Costera de Chile

Ecosistemas naturales (semi)áridos a templados húmedos

PINO ARAUCARIA-ANGUSTIFOLIA

CORDILLERA COSTERA

REDISTRIBUCIÓN HIDRÁULICA

ADQUISICIÓN DE NUTRIENTES

GLOBAL PATRONES

NUTRIENTES DEL SUELO

ACTIVIDAD DE LAS RAÍCES

PLANTA

NITRATO

CRECIMIENTO

Ciencias del suelo

Ecología

Ciencias del Medio Ambiente

Vegetation strategies for nitrogen and potassium acquisition along a climate and vegetation gradient: From semi-desert to temperate rainforest

artículo original

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