Predicting fine root lifespan from plant functional traits in temperate trees
Predicting fine root lifespan from plant functional traits in temperate trees
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DOI：
10.1111/j.1469-8137.2012.04198.x
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发表时间：
2012-09-01
期刊：
影响因子：
9.4
通讯作者：
Eissenstat, David M.
中科院分区：
文献类型：
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作者：
McCormack, M. Luke;Adams, Thomas S.;Eissenstat, David M.
尽管叶和全株性状与叶寿命之间的联系已被严格研究，但对全株性状和细根性状与根寿命之间的相似联系的了解有限。在跨物种的比较中，叶中发现的一系列特征是否也存在于根中，这些特征是否可以用来预测根的寿命？采用微型加速器对12种温带树种的细根寿命进行了观察，并将其中值寿命与细根和全株性状进行了比较。然后，我们确定了哪组组合性状在预测根的寿命模式方面最有用。根寿命中位数在不同树种间差异很大(95336 D)。根直径、钙含量和树木密度与根寿命呈正相关，而比根长、氮碳比和植株生长速率与根寿命呈负相关。根直径和植株生长率一起(R2=0.62)或与根N/C比(R2=0.76)一起预测12个树种的根寿命。我们的结果突出了温带树木细根寿命与植物功能性状之间的联系，这可能会减少在更广泛的空间尺度上预测根寿命或跨物种周转的不确定性。
Although linkages of leaf and whole-plant traits to leaf lifespan have been rigorously investigated, there is a limited understanding of similar linkages of whole-plant and fine root traits to root lifespan. In comparisons across species, do suites of traits found in leaves also exist for roots, and can these traits be used to predict root lifespan? We observed the fine root lifespan of 12 temperate tree species using minirhizotrons in a common garden and compared their median lifespans with fine-root and whole-plant traits. We then determined which set of combined traits would be most useful in predicting patterns of root lifespan. Median root lifespan ranged widely among species (95336 d). Root diameter, calcium content, and tree wood density were positively related to root lifespan, whereas specific root length, nitrogen (N) : carbon (C) ratio, and plant growth rate were negatively related to root lifespan. Root diameter and plant growth rate, together (R2 = 0.62) or in combination with root N : C ratio (R2 = 0.76), were useful predictors of root lifespan across the 12 species. Our results highlight linkages between fine root lifespan in temperate trees and plant functional traits that may reduce uncertainty in predictions of root lifespan or turnover across species at broader spatial scales.