Chin J Plant Ecol ›› 2021, Vol. 45 ›› Issue (7): 738-748.DOI: 10.17521/cjpe.2021.0125

Special Issue: 生态化学计量

• Research Articles • Previous Articles     Next Articles

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)


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