植物生态学报 ›› 2021, Vol. 45 ›› Issue (7): 738-748.DOI: 10.17521/cjpe.2021.0125

所属专题: 生态化学计量

• 研究论文 • 上一篇    下一篇

呼伦贝尔草地植物茎秆和叶片中养分的时间动态与回收

张效境1,2, 梁潇洒1,2, 马望1, 王正文1,*()   

  1. 1中国科学院沈阳应用生态研究所, 额尔古纳森林草原过渡带生态系统研究站, 沈阳 110016
    2中国科学院大学, 北京 100049
  • 收稿日期:2021-04-06 接受日期:2021-06-16 出版日期:2021-07-20 发布日期:2021-10-22
  • 通讯作者: 王正文 ORCID:0000-0002-4507-2142
  • 作者简介:* 王正文: ORCID: 0000-0002-4507-2142, wangzw@iae.ac.cn
  • 基金资助:
    国家自然科学基金(31870422)

Temporal variation and resorption of nutrients in plant culms and leaves in Hulun Buir grassland

ZHANG Xiao-Jing1,2, LIANG Xiao-Sa1,2, MA Wang1, WANG Zheng-Wen1,*()   

  1. 1Erguna Forest-Steppe Ecotone Research Station, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China
    2University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2021-04-06 Accepted:2021-06-16 Online:2021-07-20 Published:2021-10-22
  • Contact: WANG Zheng-Wen ORCID:0000-0002-4507-2142
  • Supported by:
    National Natural Science Foundation of China(31870422)

摘要:

明确植物不同器官中的养分回收状况对探究植物养分利用策略与养分循环有重要意义。以往关于养分回收的研究多聚焦于叶片, 而对于茎秆研究较少。此外, 以往研究对植物生长盛期的叶片取样均在同一时间完成, 忽略了不同物种养分峰值可能存在时间差异, 进而导致养分回收效率被低估。该研究以呼伦贝尔草地22种多年生草本植物为研究对象, 在生长季不同时期进行茎秆和叶片取样, 测定其氮(N)、磷(P)含量, 分析茎秆和叶片两类器官中的养分在生长季内的变化情况与养分回收效率。结果表明: 1)植物N、P含量在生长季内有明显的时间变化规律, 呈现出先增加后减少的趋势; 不同物种峰值对应时间存在显著差异, 大部分物种养分峰值出现于8月下旬。2)茎秆和叶片两类器官养分回收模式存在差异, 植物叶片的N回收效率高于茎秆, 但P回收效率两者差异不明显; 叶片中N、P回收效率显著正相关, 而两者关系在茎秆中不显著。3)枯叶中养分含量是回收效率重要的影响因子, 植物养分回收效率与枯叶期养分含量呈显著负相关关系, 与生长盛期养分含量无关。4)以往研究中不同植物种在生长盛期同一时间取样, 造成茎秆和叶片N、P回收效率被不同程度地低估。该研究重新审视了养分回收研究中的取样策略, 表明依据不同物种在生长季内养分含量峰值出现时间决定生长盛期成熟组织的取样时间, 能够增加养分回收效率计测的准确性和科学性。

关键词: 草本植物, 元素含量, 时间动态, 植物器官, 养分回收

Abstract:

Aims Nutrient resorption in different organs of plants is important for plant nutrient use strategies and elemental biogeochemical cycles. Previous researches on nutrient resorption have focused on leaves, but neglected culms. Additionally, leaves of different species have been collected at the same time during the peak growth stage in previous studies, ignoring the different peak times of nutrient content of different species, which leads to the underestimation of nutrient resorption efficiency.

Methods In order to explore the seasonal variation of nutrients and nutrient resorption efficiency in the culms and leaves of herbaceous plants, 22 common plants in Hulun Buir grassland were chosen as the research objects to determine the temporal dynamics of nutrient content during the growing season, and the resorption efficiency of nitrogen (N) and phosphorus (P) in plant culms and leaves.

Important findings The content of N, P in plants had obvious temporal dynamics during the growing season, showing an increasing trend first and then a decreasing trend. For most of the 22 species, the maximum content occurred in the middle and late August, but the peak time differed among different species. The resorption efficiency of N in leaves was higher than in culms, but that of P did not differ between leaves and culms. Nutrient resorption efficiency of plants was closely related to the nutrient content at the senescence stage, but not to that at the growth stage. In previous studies, different plants were sampled at the same time during the growth stage, which led to underestimation of N and P resorption efficiency of culms and leaves. This study re-examined the sampling strategy in nutrient resorption studies, and showed that the sampling time of mature tissues in the growth stage could be determined according to the peak nutrient content time of different species.

Key words: herbaceous, element content, temporal dynamics, plant organ, nutrient resorption