Stoichiometric Characteristics of Carbon, Nitrogen, and Phosphorus in Leaves of Differently Aged Lucerne (Medicago sativa) Stands.
Stoichiometric Characteristics of Carbon, Nitrogen, and Phosphorus in Leaves of Differently Aged Lucerne (Medicago sativa) Stands.
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不同龄苜蓿林叶片碳、氮、磷化学计量特征
DOI：
10.3389/fpls.2015.01062
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发表时间：
2015
影响因子：
5.6
通讯作者：
Zhang Q
中科院分区：
文献类型：
--
作者：
Wang Z;Lu J;Yang M;Yang H;Zhang Q
植物内的元素浓度对于维持功能和适应环境至关重要，可能会随着植物的生长而变化。然而，多年生物种中碳 (C)、氮 (N) 和磷 (P) 如何随林分生长（即年龄或砍伐）发生化学计量变化，仍然没有受到影响。本研究检验了苜蓿 (Medicago sativa) C:N、C:P 和 N:P 应随林龄和采伐而变化的假设。叶片C:N、C:P和N:P随林龄的变化而变化，在不同剪裁的苜蓿中表现出不同的趋势。一般来说，最大的化学计量比是在 8 年林和第二次割伐时测量的。它们受到叶片总氮和总磷浓度的显着负面影响，但不受有机碳浓度的影响。叶片C:N、C:P、N:P之间呈显着正相关。然而，叶片C:N、C:P和N:P几乎不受土壤特征的影响。总之，苜蓿 C、N 和 P 化学计量具有年龄和剪切特异性，并且主要受叶片 N、P 浓度和化学计量调节。与土壤肥力几乎没有相关性。据我们所知，这是首次尝试从年龄角度阐明多年生草本豆科植物的化学计量。
Element concentration within a plant which is vital to function maintenance and adaptation to environment, may change with plant growth. However, how carbon (C), nitrogen (N), and phosphorus (P) vary stoichiometrically with stand growth, i.e., ages or cuts, was still untouched in perennial species. This study tested the hypothesis that lucerne (Medicago sativa) C:N, C:P, and N:P should change with stand age and cut. Leaf C:N, C:P, and N:P changed with stand age, showing various trends in different cuts of lucerne. Generally the greatest stoichiometric ratios were measured in 8 year stand and in the second cut. They were affected significantly and negatively by total N and P concentrations of leaf, but not by organic C concentration. There were significantly positive correlations among leaf C:N, C:P, and N:P. However, leaf C:N, C:P, and N:P were hardly affected by soil features. Conclusively, lucerne C, N, and P stoichiometry are age- and cut-specific, and regulated mainly by leaf N, P concentrations and stoichiometry. There are few correlations with soil fertility. To our knowledge, it is the first try to elucidate the stoichiometry in the viewpoint of age and cut with a perennial herbaceous legume.