Fast-growing Larix kaempferi suffers under nutrient imbalance caused by phosphorus fertilization in larch plantation soil

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http://hdl.handle.net/10138/307909

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Li , J , Wu , G , Guo , Q , Korpelainen , H & Li , C 2018 , ' Fast-growing Larix kaempferi suffers under nutrient imbalance caused by phosphorus fertilization in larch plantation soil ' , Forest Ecology and Management , vol. 417 , pp. 49-62 . https://doi.org/10.1016/j.foreco.2018.02.046

Title: Fast-growing Larix kaempferi suffers under nutrient imbalance caused by phosphorus fertilization in larch plantation soil
Author: Li, Junyu; Wu, Guoxi; Guo, Qingxue; Korpelainen, Helena; Li, Chunyang
Contributor: University of Helsinki, Department of Agricultural Sciences
Date: 2018-05-15
Language: eng
Number of pages: 14
Belongs to series: Forest Ecology and Management
ISSN: 0378-1127
URI: http://hdl.handle.net/10138/307909
Abstract: There are significant differences in the morphological and physiological responses of larch species with contrasting growth rates under fertilization. However, little is known about species-specific differences in responses to nutrient imbalance caused by fertilization. Therefore, in this study, the effects of nitrogen (N) and phosphorus (P) fertilization on the morphological, physiological and chloroplast ultrastructural traits of two contrasting larch species, fast-growing Larix kaempferi and slowly-growing L. olgensis, grown in larch plantation soil, were investigated during two growth seasons. It was shown that N and combined N and P (NP) fertilization increased plant photosynthesis, foliar N contents, chlorophyll contents, and dry mass accumulation and partitioning in aboveground organs in both larch species. Although P fertilization enhanced P accumulation, its presence reduced the N content in soluble proteins in the foliage of both larch species. Yet, P fertilization exhibited some differences in the two species: P fertilization increased photosynthesis, chlorophyll content and biomass accumulation of L. olgensis, while it decreased these parameters dramatically in L. kaempfert P fertilization increased foliar N content in L. olgensis, while it reduced it in L. kaempferi. P fertilized L. kaempferi had more damaged chloroplast ultrastructure than L. olgensis. In addition, L. kaempferi exhibited lower acid phosphatase activities, and higher photosynthesis and biomass accumulation than L. olgensis, except under P fertilization. L. kaempferi allocated more biomass into needles, except under P fertilization, while L. olgensis allocated more into stems under fertilization. In conclusion, it was shown that nutrient imbalance caused by P fertilization has greater negative effects on a fast-growing species than on a slowly-growing one, and the negative effects are related to differences in acclimation strategies, N partitioning to photosynthetic components, and P transportation and metabolism in the foliage.
Subject: Contrasting growth rates
Nutrient imbalance
Biomass allocation strategies
N partitioning
Chloroplast ultrastructure
ALFALFA MEDICAGO-SATIVA
BIOMASS ALLOCATION
POPULUS-CATHAYANA
AMINO-ACIDS
NITROGEN DEPOSITION
NORTHEAST CHINA
N-FERTILIZATION
LEAF NITROGEN
HYDRAULIC ARCHITECTURE
TERRESTRIAL BIOSPHERE
4112 Forestry
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