Nitrogen (N) deposition impacts seedling growth of Pinus massoniana via N:P ratio effects and the modulation of adaptive responses to low P (phosphorus).
Nitrogen (N) deposition impacts seedling growth of Pinus massoniana via N:P ratio effects and the modulation of adaptive responses to low P (phosphorus).
复制标题
氮 (N) 沉积通过 N:P 比率效应和对低磷（磷）的适应性响应调节影响马尾松幼苗生长。
DOI：
10.1371/journal.pone.0079229
复制
发表时间：
2013
期刊：
影响因子：
3.7
通讯作者：
Yang Q
中科院分区：
文献类型：
--
作者：
Zhang Y;Zhou Z;Yang Q
在磷缺乏的森林生态系统中，大气氮沉降对与磷吸收和磷利用相关的营养性状的影响可能决定植物生长和植被生产力。以4个马尾松全同胞家系为材料，采用两种N沉降模拟方法，研究了3种土壤磷素条件（均匀缺磷，均匀低磷;异质缺磷，低底土磷，高表土磷;高磷）对马尾松全同胞家系N沉降的影响。在均质磷缺乏下，氮对生长的影响较小，由于较高的氮：磷比，而氮敏感基因型具有较低的氮：磷比和更大的氮敏感性。在高磷条件下，由于磷浓度的增加和平衡的N：P比，N的影响增加。N：P阈值为12.0-15.0，当N：P ≤ 12.0时，N促进生长，当N：P ≥ 15.0时，P促进生长。在均匀缺磷条件下，通过氮沉降提高磷的利用效率促进生长。在异质性磷缺乏，更大的磷缺乏氮沉降下，由于增加N：P比诱导更大的适应性反应，低P（根酸性磷酸酶分泌和表土根增殖），提高P的收购和增长。氮沉降的影响幼苗生长在不同的P条件和基因型，通过N：P比的影响和调制的适应性反应低P。氮对生长的积极影响是基因型特异性的，增加土壤中的P除了由于平衡的N：P比。这些结果表明，培育氮敏感的树木基因型和改善森林土壤磷状况，以补偿增加的氮沉降的意义。
In forest ecosystems with phosphorus (P) deficiency, the impact of atmospheric nitrogen (N) deposition on nutritional traits related to P uptake and P use potentially determines plant growth and vegetation productivity. Two N deposition simulations were combined with three soil P conditions (homogeneous P deficiency with evenly low P; heterogeneous P deficiency with low subsoil P and high topsoil P; high P) using four full-sib families of Masson pine (Pinus massoniana). Under homogeneous P deficiency, N had a low effect on growth due to higher N:P ratios, whereas N-sensitive genotypes had lower N:P ratios and greater N sensitivity. The N effect increased under higher P conditions due to increased P concentration and balanced N:P ratios. An N:P threshold of 12.0–15.0 was detected, and growth was increased by N with an N:P ratio ≤ 12.0 and increased by P with an N:P ratio ≥ 15.0. Under homogeneous P deficiency, increased P use efficiency by N deposition improved growth. Under heterogeneous P deficiency, a greater P deficiency under N deposition due to increased N:P ratios induced greater adaptive responses to low P (root acid phosphatase secretion and topsoil root proliferation) and improved P acquisition and growth. N deposition diversely affected seedling growth across different P conditions and genotypes via N:P ratio effects and the modulation of adaptive responses to low P. The positive impact of N on growth was genotype-specific and increased by soil P addition due to balanced N:P ratios. These results indicate the significance of breeding N-sensitive tree genotypes and improving forest soil P status to compensate for increasing N deposition.
登录
查看更多内容
影响因子：
5.2
作者：
Liu, Y;Mi, GH;Zhang, FS
通讯作者：
Zhang, FS
影响因子：
5.5
作者：
Farley, RA;Fitter, AH
通讯作者：
Fitter, AH
影响因子：
5.5
作者：
Hidaka, Amane;Kitayama, Kanehiro
通讯作者：
Kitayama, Kanehiro
影响因子：
5
作者：
Gallant, AL;Hansen, AJ;Betz, DW
通讯作者：
Betz, DW
影响因子：
3.6
作者：
Kubartova, Ariana;Ranger, Jacques;Beguiristain, Thierry
通讯作者：
Beguiristain, Thierry