Taxonomic, phylogenetic, and environmental trade-offs between leaf productivity and persistence
Taxonomic, phylogenetic, and environmental trade-offs between leaf productivity and persistence
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叶子生产力和持久性之间的分类学、系统发育和环境权衡
DOI：
10.1890/08-1126.1
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发表时间：
2009-10-01
期刊：
影响因子：
4.8
通讯作者：
Fang, Jingyun
中科院分区：
文献类型：
--
作者：
He, Jin-Sheng;Wang, Xiangping;Fang, Jingyun
评估气候、土壤肥力和物种特性对叶片性状关系的影响，对于了解植物对环境的适应和解释跨空间尺度的叶片性状关系至关重要。在对中国地区174个草地站点的171种植物的田间比较研究中，我们研究了叶片持久性(单位面积叶质量)与叶片生产力(基于质量的光合作用速率、A(质量)、N和P含量以及光合N利用效率(PNUE)之间的权衡。我们询问这些权衡在多大程度上受到以下因素的影响：(1)物种内不同地点之间的差异，由于气候和土壤变量而分解为差异；(2)物种间差异，分解为分类学、功能或系统发育类群之间的差异；以及(3)物种和地点之间差异的共同贡献。我们使用协方差的混合模型分析将叶片性状之间的双变量关系划分为权衡成分。我们发现，LMA-A(MASS)、LMA-N、LMA-P和LMA-PNUE的显著基于质量的持久性-生产力权衡与之前的大范围研究结果一致。总体而言，(1)种内变异解释了14-23%，(2)种内变异解释了20-34%，(3)两者共同解释了叶片性状总协方差的42-63%。LMA-A、LMA-N和LMA-P的种间权衡大于立地间权衡。气候变量和土壤变量的协方差相对较小。然而，我们发现，LMA-N和LMA-P在降雨量较大时的权衡较强，而LMA-PNUE在土壤肥力较高时的权衡较强，如果通过结合种内和种间变异的长轴回归表现出来的话。物种和地点内的剩余权衡很弱，这表明种内、地点内的生理差异不如物种身份或地点之间的环境差异所造成的差异重要。我们对草原生物群的研究结果进一步证明了生产力的根本性质--植物的持久性权衡。没有任何个人因素成为这些权衡的唯一主要原因。相反，叶片性状之间的总协方差是由一系列因素组合解释的，每个因素都贡献了一系列解释能力。
Assessing the influence of climate, soil fertility, and species identity on leaf trait relationships is crucial for understanding the adaptations of plants to their environment and for interpreting leaf trait relationships across spatial scales. In a comparative field study of 171 plant species in 174 grassland sites across China, we examined the trade-offs, defined as negative covariance between two traits, between leaf persistence (leaf mass per area, LMA) and leaf productivity (mass-based photosynthetic rate, A(mass), N and P content, and photosynthetic N use efficiency, PNUE). We asked to which extent these trade-offs were influenced by: (1) variation among sites within species, decomposed into variation due to climatic and soil variables; (2) variation among species within sites, decomposed into variation among taxonomic, functional, or phylogenetic groups; and (3) the joint contribution of variation among species and sites. We used mixed-model analysis of covariance to partition bivariate relationships between leaf traits into trade-off components. We found significant mass-based persistence-productivity trade-offs of LMA-A(mass), LMA-N, LMA-P, and LMA-PNUE consistent with previous broadscale findings. Overall, (1) variation among sites within species explained 14-23%, (2) variation among species within sites explained 20-34%, and (3) the two together explained 42-63% of the total covariance between leaf traits. Interspecific trade-offs of LMA-A(mass), LMA-N, and LMA-P were stronger than inter-site ones. A relatively low amount of covariance was explained by climatic and soil variables. However, we found the trade-offs were stronger for LMA-N and LMA-P at higher precipitation and for LMA-PNUE at greater soil fertility, if displayed by major axis regression, which combined both intra-and interspecific variation. Residual trade-offs within species and sites were weak, suggesting that intraspecific, intra-site variation in physiology was less important than variation imposed by species identity or environmental differences among sites. Our results from grassland biomes add evidence for the fundamental nature of productivity-persistence trade-offs in plants. No individual factor emerged as the single major cause for these trade-offs. Rather, the total covariance between leaf traits was explained by a combination of factors, each contributing a range of explanatory power.