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首页> 外文期刊>Plant and Soil >Light inhibition of leaf respiration as soil fertility declines along a post-glacial chronosequence in New Zealand: an analysis using the Kok method
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Light inhibition of leaf respiration as soil fertility declines along a post-glacial chronosequence in New Zealand: an analysis using the Kok method

机译：随着土壤肥力的下降，冰川后的时间序列对叶片呼吸的光抑制作用：使用Kok方法进行的分析

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摘要

Our study quantified variations leaf respiration in darkness (R (D)) and light (R (L)), and associated traits along the Franz Josef Glacier soil development chronosequence in New Zealand. At six sites along the chronosequence (soil age: 6, 60, 150, 500, 12,000 and 120,000 years old), we measured rates of leaf R (D), R (L) (using Kok method), light-saturated CO2 assimilation rates (A), leaf mass per unit area (M (A)), and concentrations of leaf nitrogen ([N]), phosphorus ([P]), soluble sugars and starch. The chronosequence was characterised by decreasing R (D), R (L) and A, reduced [N] and [P] and increasing M (A) as soil age increased. Light inhibition of R occurred across the chronosequence (mean inhibition = 16 %), resulting in ratios of R (L):A being lower than for R (D):A. Importantly, the degree of light inhibition differed across the chronosequence, being lowest at young sites and highest at old sites. This resulted in R (L):A ratios being relatively constant across the chronosequence, whereas R (D):A ratios increased with increasing soil age. Log-log R-A-M (A)-[N] relationships remained constant along the chronosequence. By contrast, relationships linking rates of leaf R to [P] differed among leaves with low vs high [N]:[P] ratios. Slopes of log-log bivariate relationships linking R (L) to A, M (A), [N] and [P] were steeper than that for R (D). Our findings have important implications for predictive models that seek to account for light inhibition of R, and for our understanding of how environmental gradients impact on leaf trait relationships.
机译：我们的研究量化了新西兰的弗朗茨·约瑟夫冰川土壤发育历时序列中黑暗（R（D））和光（R（L））中叶片呼吸的变化以及相关性状。在按时间顺序排列的六个位置（土壤年龄：6、60、150、500、12,000和120,000年），我们测量了叶片的R（D），R（L）（使用Kok方法），轻饱和CO2同化率比率（A），每单位面积的叶片质量（M（A））以及叶片氮（[N]），磷（[P]），可溶性糖和淀粉的浓度。时间序列的特征是随着土壤年龄的增加，R（D），R（L）和A降低，[N]和[P]降低，M（A）升高。在整个时间序列上对R的光抑制作用（平均抑制= 16％），导致R（L）：A的比率低于R（D）：A的比率。重要的是，光抑制的程度在时间序列上是不同的，在年轻场所最低，而在老场所最高。这导致R（L）：A比率在整个时序序列中相对恒定，而R（D）：A比率随土壤年龄的增加而增加。对数对数R-A-M（A）-[N]关系沿时间序列保持恒定。相比之下，在[N]：[P]比率较低与较高的叶片之间，将叶片R与[P]的比率联系起来的关系是不同的。将R（L）链接到A，M（A），[N]和[P]的对数-对数二元关系的斜率比R（D）的斜率陡。我们的发现对寻求解释光抑制R的预测模型以及我们对环境梯度如何影响叶片性状关系的理解具有重要意义。

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