Variations in foliar nutrient resorption efficiency of different plant growth forms in a temperate sandy grassland

• Autorzy: Mao W. , Li Y. , Cui J. , Zuo X. , Zhao X.
• Języki publikacji: EN

Abstrakty

EN

Foliar nutrient resorption is an important strategy which allows leaf nutrients to be reused rather than lost with leaf fall, particularly in nutrient-poor ecosystems where even small nutrient losses can have significantly negative impacts on plant survival, competitive ability, and fitness. However, plants vary greatly in nitrogen (N) and phosphorus (P) resorption among plant growth forms during leaf senescence, which may be vital to understand the role of plant growth forms in ecosystem functioning. Green and senesced leaf N and P concentrations of 39 plant species in sandy grassland (Horqin Sand Land) of northern China were analyzed to detect variations of nutrient resorption efficiency among plant growth forms. The results showed that nitrogen resorption efficiency (NRE) ranged from 29% to 74%, with an average ([plus or minus] SD) of 50.3 [plus or minus] 11.2%, and phosphorus resorption efficiency (PRE) varied among species between 46% and 82%, with a mean ([plus or minus] SD) of 68.4 [plus or minus] 6.9%, suggesting that nutrient resorption is a vital nutrient conservation strategy in this ecosystem. In addition, NRE and PRE differed significantly among the dominant plant growth forms in this sandy grassland. NRE for N-fixing species and graminoids were significantly lower relative to NRE for shrubs and forbs, but mean PRE of graminoids was significantly higher than those of N fixers, shrubs and forbs. These data give indirect evidence that the differentiation of N and P conservation serve as an important mechanism permitting the co-existence of growth forms in arid systems.

Słowa kluczowe

EN

Horqin Sand Land; leaf nitrogen concentration; leaf phosphorus concentration; nitrogen resorption efficiency; phosphorus resorption efficiency

PL

stężenie azotu w liściach; stężenie fosforu w liściach; wydajność resorpcja azotu; wydajność resorpcja fosforu

• Wydawca: Museum and Institute of Zoology, Polish Academy of Sciences
• Czasopismo: Polish Journal of Ecology
• Rocznik: 2011
• Tom: Vol. 59, nr 2
• Strony: 355--365
• Opis fizyczny: Bibliogr. 48 poz.,Rys., tab.,

Twórcy

autor

Mao W.

autor

Li Y.

autor

Cui J.

autor

Zuo X.

autor

Zhao X.

• Naiman Desertification Research Station Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, 322 Donggang West Road, Lanzhou 730000, China ; Extreme Stress Resistance and Biotechnology Laboratory Cold and A,

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