Changes in nitrogen and phosphorus cycling suggest a transition to phosphorus limitation with the stand development of larch plantations
Changes in nitrogen and phosphorus cycling suggest a transition to phosphorus limitation with the stand development of larch plantations
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DOI：
10.1007/s11104-017-3473-9
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发表时间：
2017
期刊：
影响因子：
4.9
通讯作者：
Tao Yan;X. Lü;Jiaojun Zhu;Kai Yang;Li-zhong Yu;Tian Gao
中科院分区：
文献类型：
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作者：
Tao Yan;X. Lü;Jiaojun Zhu;Kai Yang;Li-zhong Yu;Tian Gao
目的整个种植园树木生长养分限制状态的变化对种植园管理具有重大影响。然而，这种转变的根本机制却很少得到解决。虽然植物养分利用策略会因土壤养分变化而改变，但它们也可能对土壤养分动态产生反馈，从而影响植物养分限制状态。方法我们检查了整个种植园时间序列中中国东北地区的优势用材树种落叶松（Larix kaempferi）的土壤和叶面养分。结果在整个时间序列中，土壤总氮增加，但土壤总磷减少。同样，绿叶中的氮浓度与林龄呈正相关，磷浓度与林龄呈负相关。叶面 N:P 比率、N 和 P 吸收效率以及 PRE:NRE 与林龄呈正相关，表明在整个时间序列中从 N 限制向 P 限制的转变。在整个时间序列中，衰老叶片中的磷浓度下降，氮磷比增加，这对分解和养分释放具有影响。结论随着林龄的增加，养分吸收、土壤pH值、生物量磷固存以及氮磷输入不平衡将导致磷限制的发生。此外，适应性施肥管理策略应考虑养分限制模式随时间顺序的变化。
AimsThe changes of nutrient limitation status for tree growth across a plantation chronosequence have great implications for plantation management. The underlying mechanisms for such a shift, however, have seldom been addressed. While plant nutrient use strategies would change in response to soil nutrient alteration, they may also create feedback on soil nutrient dynamics and thus plant nutrient limitation status.MethodsWe examined soil and foliar nutrients of larch (Larix kaempferi), the dominant timber species in Northeast China, across a plantation chronosequence.ResultsTotal soil N increased but total soil P decreased across the chronosequence. Similarly, N concentrations in the green leaves were positively correlated, and P concentrations were negatively correlated with stand age. Foliar N:P ratios, N and P resorption efficiencies and PRE:NRE were positively correlated with stand age, indicating the shift from N-limitation to P-limitation across the chronosequence. P concentration in senesced leaves decreased and N:P ratios increased across the chronosequence, which has implications for decomposition and nutrient release.ConclusionsNutrient resorption, soil pH, biomass P sequestration and imbalanced inputs of N and P would contribute to the occurrence of P-limitation with increased stand age. Furthermore, adaptive fertilization management strategies should consider the shift of nutrient limitation patterns across the chronosequence.