车桑子幼苗生物量分配与叶性状对氮磷浓度的响应差异
收稿日期: 2020-06-18
录用日期: 2020-09-25
网络出版日期: 2020-12-09
基金资助
国家自然科学基金(31460127)
Different responses of biomass allocation and leaf traits of Dodonaea viscosa to concentrations of nitrogen and phosphorus
Received date: 2020-06-18
Accepted date: 2020-09-25
Online published: 2020-12-09
Supported by
National Natural Science Foundation of China(31460127)
调整叶性状和生物量分配格局是植物适应环境变化的主要途径, 研究车桑子(Dodonaea viscosa)幼苗生物量分配与叶性状对氮磷浓度的响应对认识车桑子在氮磷浓度变化下的适应策略具有重要意义。该研究通过砂培法, 测定不同氮浓度(3、5、15、30 mmol·L-1)与不同磷浓度(0.25、0.5、1、2 mmol·L-1)下车桑子幼苗的生长、生物量分配、叶性状的响应特征及其相互关系。结果表明: 高浓度氮(30 mmol·L-1)促进了车桑子幼苗生长、叶片氮含量和生物量积累, 其余氮添加条件(3、5、15 mmol·L-1)下车桑子幼苗各性状无显著差异, 但相比高氮水平, 其生物量积累和叶片氮含量显著降低, 根冠比和氮利用效率显著增加。随着磷添加浓度的增加, 车桑子幼苗生物量显著增加, 低磷条件(0.25、0.5 mmol·L-1)限制了车桑子幼苗生长和生物量积累, 其根冠比和磷利用效率均没有发生显著变化, 但比叶面积和叶/茎生物量比例显著增加, 叶干物质含量显著降低。氮处理下, 叶片氮含量与根冠比显著负相关; 磷处理下, 叶片氮含量与比叶面积显著正相关。同时, 氮处理下, 车桑子幼苗株高、基径、总生物量等生长性状均与根冠比显著负相关, 与叶片氮含量显著正相关, 表明根冠比和叶片氮含量的调整在车桑子适应氮限制中发挥重要作用; 而磷处理下, 株高、基径、总生物量与比叶面积显著负相关, 与叶干物质含量显著正相关, 表明叶片结构性状的调整在车桑子适应低磷环境中具有重要意义。该研究表明, 车桑子幼苗生物量分配和叶性状及性状间的权衡策略对氮、磷的响应具有明显差异性, 在今后的研究中, 应关注氮和磷对植物性状影响的差异性。
王雪梅, 闫帮国, 史亮涛, 刘刚才 . 车桑子幼苗生物量分配与叶性状对氮磷浓度的响应差异[J]. 植物生态学报, 2020 , 44(12) : 1247 -1261 . DOI: 10.17521/cjpe.2020.0199
Aims The adjustment of leaf traits and biomass allocation is an important way for plants to adapt to environmental changes. Revealing the responses of biomass allocation and leaf traits of Dodonaea viscosa seedlings to nitrogen and phosphorus concentrations, is crucial to understand the adaptation strategies of D. viscosa under the changes of nitrogen and phosphorus.
Methods Seedlings of D. viscosa were planted under nitrogen concentrations (3, 5, 15, 30 mmol·L-1) and phosphorus concentrations (0.25, 0.5, 1, 2 mmol·L-1) by sand culture. Plant height, base diameter, biomass allocation, leaf traits and their correlations were quantified.
Important findings The results showed that high nitrogen concentration (30 mmol·L-1) increased the height, diameter, leaf nitrogen concentration, and biomass accumulation of D. viscosa, and there were no significant differences of the traits under other concentrations (3, 5, 15 mmol·L -1). Compared with the high nitrogen level, other treatments significantly reduced the biomass accumulation and leaf nitrogen concentration, and significantly increased the root:shoot biomass ratio and nitrogen utilization efficiency. With the increase of phosphorus concentration, the biomass of D. viscosa increased significantly. Low phosphorus concentrations (0.25, 0.5 mmol·L-1) significantly constrained the growth of D. viscosa, and the root:shoot biomass ratio and phosphorus utilization efficiency did not change significantly. Low phosphorus conditions increased the specific leaf area and the leaf:stem biomass ratio, and decreased leaf dry matter content significantly. Under the nitrogen treatment, leaf nitrogen concentration was negatively correlated with the root:shoot biomass ratio, while under phosphorus treatment, leaf nitrogen concentration was positively correlated with specific leaf area. Height, diameter and total biomass of D. viscosa were negatively correlated with the root:shoot biomass ratio, and positively correlated with leaf nitrogen concentration under the condition of nitrogen treatment, indicating that the adjustment of root:shoot biomass ratio and leaf nitrogen concentration played an important role in adapting to nitrogen limitation. However, under the condition of phosphorus treatment, height, diameter and total biomass were negatively correlated with specific leaf area, and positively correlated with leaf dry matter content, indicating that the adjustment of leaf structural traits was of great significance in adapting to changes of phosphorus. Our findings suggest that the biomass allocation, leaf traits and their relationships responded differently to changes in nitrogen and phosphorus, and the effects of nitrogen or phosphorus on plant traits should be discriminated in the future.
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