Shao Jing, Chen Xiao-Ping, Li Jin-Long, Hu Dan-Dan, Wang Man-Tang, Zhong Quan-Lin, Cheng Dong-Liang
Fujian Provincial Key Laboratory of Plant Ecophysiology, Fujian Normal University, Fuzhou 350007, China.
Institute of Geography, Fujian Normal University, Fuzhou 350007, China.
Ying Yong Sheng Tai Xue Bao. 2021 Apr;32(4):1193-1200. doi: 10.13287/j.1001-9332.202104.010.
Nutrient resorption is an important strategy of nutrient conservation, which reflecting the ability of plants to conserve and utilize nutrients and adapt to environment. To explore the relationship between nutrient content and nutrient resorption of broadleaved woody species of different life forms (., evergreen vs. deciduous), we sampled 30 broadleaved woody species in subtropical region of China located in Yangjifeng National Nature Reserve, Jiangxi Province. The nitrogen (N) and phosphorus (P) concentrations in green and senescent leaves of each species were measured to calculate nutrient resorption efficiency. Furthermore, we analyzed the relationship of leaf nutrient concentration and resorption efficiency for the different life forms. The results showed that N and P concentrations in green leaves were significantly higher in deciduous trees than those in evergreen trees. The P concentrations of senescent leaves in deciduous woody species was significantly higher than that in evergreen woody species. There was no significant difference of N concentration in senescent leaves between evergreen and deciduous species. Nitrogen resorption efficiency (NRE) and phosphorus resorption efficiency (PRE) of the 30 broadleaved woody species were 49.6% and 50.9%, respectively. There were no significant differences between the NRE and PRE of evergreen and deciduous species. NRE and PRE negatively correlated with N and P concentrations in senescent leaves, respectively. Additionally, evergreen and deciduous species showed similar relationships between nutrient resorption efficiency and nutrient concentration in senescent leaves. The sca-ling exponent of allometric relationship between NRE and PRE was 1.18 across all the species. The nutrient resorption efficiency of all the species were affected by the nutrient status of the senesced leaves. Plants examined in this study generally re-absorbed P from senescing leaves than N.
养分重吸收是养分保存的一项重要策略，它反映了植物保存和利用养分以及适应环境的能力。为了探究不同生活型（如常绿与落叶）阔叶木本植物的养分含量与养分重吸收之间的关系，我们在中国江西省阳际峰国家级自然保护区的亚热带地区采集了30种阔叶木本植物的样本。测量了每个物种绿叶和衰老叶片中的氮（N）和磷（P）浓度，以计算养分重吸收效率。此外，我们分析了不同生活型叶片养分浓度与重吸收效率之间的关系。结果表明，落叶树绿叶中的N和P浓度显著高于常绿树。落叶木本植物衰老叶片中的P浓度显著高于常绿木本植物。常绿和落叶物种衰老叶片中的N浓度没有显著差异。30种阔叶木本植物的氮重吸收效率（NRE）和磷重吸收效率（PRE）分别为49.6%和50.9%。常绿和落叶物种的NRE和PRE之间没有显著差异。NRE和PRE分别与衰老叶片中的N和P浓度呈负相关。此外，常绿和落叶物种在衰老叶片养分重吸收效率与养分浓度之间表现出相似的关系。所有物种中NRE和PRE之间异速生长关系的标度指数为1.18。所有物种的养分重吸收效率受衰老叶片养分状况的影响。本研究中检测的植物通常从衰老叶片中重新吸收的P比N多。
