Root morphology and seedling growth of three tree species in southern China in response to homogeneous and heterogeneous phosphorus supplies
Root morphology and seedling growth of three tree species in southern China in response to homogeneous and heterogeneous phosphorus supplies
复制标题
中国南方三种树种根系形态和幼苗生长对同质和异质磷供应的响应
DOI：
10.1007/s00468-019-01858-x
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发表时间：
2019-10
期刊：
影响因子：
--
通讯作者：
Wu Pengfei
中科院分区：
文献类型：
--
作者：
Yan Xiao Li;Wang Chen;Ma Xiangqing;Wu Pengfei
研究了3种主要树种根系形态和幼苗生长对均匀和非均匀磷供应的响应（Cunninghamia lanceolata，Pinus massoniana，and Phoebe zhennan）。盆栽试验包括两个同源磷和五个异源磷供应不同的磷剂量水平进行了三个物种。对根长、根平均直径、根生物量、地上生物量、根冠比、磷积累量、磷效率比以及苗高和苗粗生长量进行了定量分析。三种植物的根系表现出对称和不对称的增长响应homo-P和hetero-P供应，分别。富磷斑块的根系生物量和平均直径均大于贫磷斑块，而贫磷斑块的根系比相反斑块的根系更细、更长。在同等磷用量下，异磷处理的根长和根生物量均高于同磷处理。异质性大小与地上生物量呈负相关，与根系生物量和根冠比呈正相关。磷效率比与施磷量呈负相关。生长反应包括根系形态和根冠比的综合调整。根系生长方式发生变化，以适应土壤磷素有效性的降低，根冠比增加，优化养分分配，促进磷素吸收。
Key messageTrees adjust their root morphological characteristics to respond heterogeneous phosphorus conditions, and root length and root-to-shoot ratio will increase to improve phosphorus nutrient absorption in heterogeneous phosphorus soils.AbstractThis study examined the responses of root morphology and seedling growth to homogeneous and heterogeneous phosphorus (P) supplies in three major tree species (Cunninghamia lanceolata,Pinus massoniana, andPhoebe zhennan) in southern China. Pot experiments including two homo-P and five hetero-P supplies with different P dosage levels were conducted across three species. Root length, root average diameter, root biomass, aboveground biomass, root-to-shoot ratio, P accumulation, P-efficiency ratio, and increments in height and diameter of seedlings were quantified. Roots of the three species showed symmetric and asymmetric growth in response to homo-P and hetero-P supplies, respectively. The root biomass and average diameter were greater in the P-rich patch than in the P-poor patch, and roots in the P-poor patch were thinner and longer than their opposite counterparts. The root length and biomass were higher in hetero-P treatments than in homo-P treatments at an equivalent P dosage. The heterogeneity magnitude was negatively correlated with the aboveground biomass and positively correlated with the root biomass and root-to-shoot ratio. TheP-efficiency ratio was negatively correlated with the dose of added P. The growth responses include a comprehensive adjustment in the root morphology and root-to-shoot ratio. The root growth pattern can change to adapt to lower P availability in soil, and the root-to-shoot ratio will increase to optimize nutrient partitioning and improve P-nutrient absorption in hetero-P soils.
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影响因子：
9.4
作者：
Hodge, A;Stewart, J;Fitter, AH
通讯作者：
Fitter, AH
影响因子：
6.5
作者：
H. Scherer;S. Sharma
通讯作者：
H. Scherer;S. Sharma
影响因子：
2.3
作者：
Beebe, SE;Rojas-Pierce, M;Lynch, JP
通讯作者：
Lynch, JP
影响因子：
4
作者：
D. Rothstein;D. Zak;K. Pregitzer;P. Curtis
通讯作者：
D. Rothstein;D. Zak;K. Pregitzer;P. Curtis
影响因子：
--
作者：
Liu Ai-qin;Ma Xiangqing;L. Xia;Huang Yi-jiang;Feng Li-zhen
通讯作者：
Liu Ai-qin;Ma Xiangqing;L. Xia;Huang Yi-jiang;Feng Li-zhen