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罗志斌, Zhi-Bin Luo, Carlo Calfapietra, Giuseppe Scarascia-Mugnozza, Marion Liberloo, Andrea Polle
Plant Soil (2008) 304: 45-57,-0001,():
-1年11月30日
The goal of this study was to investigate whether increased nitrogen use efficiency found in Populus nigra L. (Jean Pourtet) under elevated CO2 would correlate with changes in the production of carbon-based secondary compounds (CBSCs). Using Free-Air CO2 Enrichment (FACE) technology, a poplar plantation was exposed to either ambient (about 370 μmol mol-1 CO2) or elevated (about 550 μmol mol-1 CO2) [CO2] for 5 years. After three growing seasons, the plantation was coppiced and half of the experimental plots were fertilized with nitrogen. CBSCs, total nitrogen and lignin-bound nitrogen were quantified in secondary sprouts in seasons of active growth and dormancy during 2 years after coppicing. Neither elevated CO2 nor nitrogen fertilisation alone or in combination influenced lignin concentrations in wood. Soluble phenolics and soluble proteins in wood decreased slightly in response to elevated CO2. Higher nitrogen supply stimulated formation of CBSCs and increased protein concentrations. Lignin-bound nitrogen in wood ranged from 0.37-1.01 mg N g-1 dry mass accounting for 17-26% of total nitrogen in wood, thus, forming a sizeable nitrogen fraction resistant to chemical degradation. The concentration of this nitrogen fraction was significantly decreased by elevated CO2, increased in response to nitrogen fertilisation and showed a significant CO2 × fertilisation interaction. Seasonal changes markedly affected the internal nitrogen pools. Soluble proteins in wood were 52-143% higher in the dormant than in the growth season. Positive correlations existed between the biosynthesis of proteins and CBSCs. The limited responses to elevated CO2 and nitrogen fertilisation indicate that growth and defence are well orchestrated in P. nigra and that changes in the balance of both resources-nitrogen and C-have only marginal effects on wood chemistry.
Lignin, Phenolics, Tannins, Soluble proteins, Internal nitrogen pools, Populus
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罗志斌
,-0001,():
-1年11月30日
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罗志斌, ZHI-BIN LUO*, CARLOCAL FAPIETRA†, MARION LIBERLO‡, GIUSEPPE SCARA SCIA-MUGNOZZA† and ANDREA POLLE*
Global Change Biology (2006) 12, 272-283,-0001,():
-1年11月30日
To determine whether globally increasing atmospheric carbon dioxide (CO2) concentrations can affect carbon partitioning between nonstructural and structural carbon pools in agroforestry plantations, Populus nigra was grown in ambient air (about 370 lmol mol 1 CO2) and in air with elevated CO2 concentrations (about 550 lmol mol 1 CO2) using freeair CO2 enrichment (FACE) technology. FACE was maintained for 5 years. After three growing seasons, the plantation was coppiced and one half of each experimental plot was fertilized with nitrogen. Carbon concentrations and stocks were measured in secondary sprouts in seasons of active growth and dormancy during 2 years after coppicing. Although FACE, N fertilization and season had significant tissue-specific effects on carbon partitioning to the fractions of structural carbon, soluble sugars and starch as well as to residual soluble carbon, the overall magnitude of these shifts was small. The major effect of FACE and N fertilization was on cell wall biomass production, resulting in about 30% increased above ground stocks of both mobile and immobile carbon pools compared with fertilized trees under ambient CO2. Relative C partitioning between mobile and immobile C pools was not significantly affected by FACE or N fertilization. These data demonstrate high metabolic flexibility of P. nigra to maintain C-homeostasis under changing environmental conditions and illustrate that nonstructural carbon compounds can be utilized more rapidly for structural growth under elevated atmospheric [CO2] in fertilized agroforestry systems. Thus, structural biomass production on abandoned agricultural land may contribute to achieving the goals of the Kyoto protocol.
agroforestry, bark, biomass, carbon sequestration, global change, Kyoto protocol, Populus, sugar, starch, xylem
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