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首页> 外文期刊>Oecologia >Association between tree-ring and needle delta C-13 and leaf gas exchange in Pinus halepensis under semi-arid conditions
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Association between tree-ring and needle delta C-13 and leaf gas exchange in Pinus halepensis under semi-arid conditions

机译：半干旱条件下哈林松树轮和针状三角洲C-13与叶片气体交换的关系

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摘要

Associations between delta(13)C values and leaf gas exchanges and tree-ring or needle growth, used in ecophysiological compositions, can be complex depending on the relative timing of CO2 uptake and subsequent redistribution and allocation of carbon to needle and stem components. For palaeoenvironmental and dendroecological studies it is often interpreted in terms of a simple model of delta(13)C fractionation in C-3 plants. However, in spite of potential complicating factors, few studies have actually examined these relationships in mature trees over inter- and intra-annual time-scales. Here, we present results from a 4 years study that investigated the links between variations in leaf gas-exchange properties, growth, and dated delta(13)C values along the needles and across tree rings of Aleppo pine trees growing in a semi-arid region under natural conditions or with supplemental summer irrigation. Sub-sections of tissue across annual rings and along needles, for which time of formation was resolved from growth rate analyses, showed rapid growth and 6 C responses to changing environmental conditions. Seasonal cycles of growth and delta(13)C (Up to similar to 4%.) significantly correlated (P<0.01) with photosynthetically active radiation, vapour pressure deficit, air temperature, and soil water content. The irrigation significantly increased leaf net assimilation, stomatal conductance and needle and tree-ring growth rate, and markedly decreased needle and tree-ring delta(13)C values and its sensitivity to environmental parameters. The delta(13)C estimates derived from gas-exchange parameters, and weighted by assimilation, compared closely with seasonal and inter-annual delta(13)C values of needle- and tree-ring tissue. Higher stomatal conductances of the irrigated trees (0.22 vs. 0.08 mol m(-2) s(-1) on average) corresponded with similar to 2.0% lower average delta(13)C values, both measured and derived. Derived and measured delta(13)C values also indicated that needle growth, which occurs throughout the stressful summer was supported by carbon from concurrent, low rate assimilation. For Aleppo pine under semi-arid and irrigated conditions, the delta(13)C of tree-ring and needle material proved, in general, to be a reasonable indicator of integrated leaf gas-exchange properties.
机译：生态生理成分中使用的delta（13）C值与叶片气体交换和树木年轮或针叶生长之间的关联可能很复杂，具体取决于吸收二氧化碳的相对时间以及随后碳向针叶和茎成分的重新分配和分配。对于古环境和树状生态学研究，通常以C-3植物中delta（13）C分离的简单模型来解释。然而，尽管存在潜在的复杂因素，但很少有研究实际检查过年际和年内时间尺度上成熟树木中的这些关系。在这里，我们提供了一项为期4年的研究结果，该研究调查了在半干旱地区生长的阿勒颇松树针叶间和跨年轮的叶片气体交换特性变化，生长和带日期的delta（13）C值之间的联系。自然条件或夏季补充灌溉的地区。年轮和沿针的组织子区域的生长速度分析可解决形成时间，该区域可迅速生长，并且对不断变化的环境条件具有6 C响应。生长和δ（13）C（最多接近4％）的季节性周期与光合有效辐射，蒸气压亏空，气温和土壤含水量显着相关（P <0.01）。灌溉显着提高了叶片净吸收，气孔导度以及针和树环的生长速率，并显着降低了针和树环的delta（13）C值及其对环境参数的敏感性。从气体交换参数得出的delta（13）C估计值，并通过同化加权，与针状和年轮组织的季节性和年际delta（13）C值进行了比较。灌溉树木的较高气孔导度（平均为0.22 vs. 0.08 mol m（-2）s（-1））与测量和推导的平均delta（13）C值均低2.0％相似。派生和测得的delta（13）C值还表明，在整个紧张的夏季发生的针叶生长受到同时低速同化的碳的支持。对于半干旱和灌溉条件下的阿勒颇松，树轮和针叶材料的δ（13）C通常被证明是综合的叶片气体交换特性的合理指标。

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