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Changes in the N and P concentrations, N : P ratios, and tannin content in Casuarina equisetifolia branchlets during development and senescence

机译:木麻黄(Casuarina equisetifolia)小枝在发育和衰老过程中氮和磷浓度,氮:磷比和单宁含量的变化

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摘要

Changes in the N and P concentrations, N:P ratios, and tannin content in Casuarina equisetifolia branchlets across a coastal gradient were studied at Chishan Forestry Center of Dongshan County, Fujian Province, China. (1) Total phenolics and protein precipitation capacity in young branchlets was significantly higher than in mature and senescent branchlets across a coastal gradient; extractable condensed tannin content was higher in young and mature branchlets than in senescent branchlets. Whereas protein-bound condensed tannins increased with senescence, fiber-bound condensed tannins fluctuated without a consistent pattern; (2) N and P concentrations at various stages of branchlet development across a coastal gradient followed the same order: young branchlets > mature branchlets > senescent branchlets; N:P ratio of young branchlets was the lowest, and increased with maturity and senescence across a coastal gradient; phosphorus resorption efficiency was significantly higher than nitrogen resorption efficiency among corresponding coastal gradients in response to P deficiency (high N:P ratio), but nutrient resorption efficiency was influenced by coastal gradients; (3) significant linear relationships between total phenolics and nutrient contents indicated that polyphenolics had a potential effect on nutrient cycling.
机译:在中国福建省东山县赤山林业中心研究了木麻黄木小枝中N和P浓度,N:P比和单宁含量在沿海梯度上的变化。 (1)沿沿海梯度,幼小枝的总酚和蛋白质沉淀能力显着高于成熟和衰老的小枝;年轻和成熟小枝中可提取的浓缩单宁含量高于衰老小枝。与蛋白质结合的单宁浓度随衰老而增加,而与纤维结合的单宁浓度波动却没有规律。 (2)沿沿海梯度的小枝发育各个阶段的氮和磷浓度遵循相同的顺序:年轻的小枝>成熟的小枝>衰老的小枝;幼枝的N:P比率最低,并且随着成熟度和衰老程度的增加,沿沿海梯度增加。磷缺乏时(高N:P比),磷的吸收效率显着高于相应的沿海梯度中的氮吸收效率,但养分吸收效率受沿海梯度影响。 (3)总酚与养分含量之间的线性关系表明,多酚对养分循环具有潜在的影响。

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