The response of two nutrient acquisition strategies: root traits and leaf nutrient resorption and their relationships to long-term mowing in a temperate steppe
The response of two nutrient acquisition strategies: root traits and leaf nutrient resorption and their relationships to long-term mowing in a temperate steppe
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DOI：
10.1007/s11104-022-05533-y
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发表时间：
2022-06
期刊：
影响因子：
4.9
通讯作者：
Qingmei Li;Wenming Bai;Yumeng Guo;J. Sheng;Yujia Yuan;Wen‐Hao Zhang;Meng Zhou
中科院分区：
文献类型：
--
作者：
Qingmei Li;Wenming Bai;Yumeng Guo;J. Sheng;Yujia Yuan;Wen‐Hao Zhang;Meng Zhou
目的刈割对草本植物养分吸收的影响可能会对草本植物的养分吸收策略产生深远的影响，这是因为刈割会沿着养分的流失。根系吸收养分和衰老叶片吸收养分是多年生草本植物获取养分的两种主要途径。然而，在这方面，方法在长期刈割试验平台上，测定了7种不同株高的多年生草本植物的根系特征和叶片氮吸收效率（2003-2020）在温带草原。结果我们发现，高，矮物种的根系性状对长期割草的反应不大。而刈割对两种植物群体叶片NRE的影响相反，刈割显著降低了高大植物的NRE，但增加了矮小植物的NRE（无茎委陵菜除外）。此外，根系吸收能力（根系性状）与叶片NRE高的物种在控制地块呈正相关，但割草消除了这种关系。相比之下，对于短的物种，根性状和叶NRE没有相关性，在控制地块，而割草导致根吸收能力和叶resorption rates.ConclusionsOur结果表明，多年生草本植物改变了替代资源收购策略之间的关系，在温带草原长期割草。这些发现为了解温带草原草本植物对刈割的适应性提供了新的视角。
PurposeMowing may exert profound influences on nutrient acquisition strategies of herbaceous species due to the nutrient removal along with the mown plants. Nutrient uptake by roots and nutrient resorption from senescent leaves, are two main nutrient acquisition strategies of perennial herbaceous species. However, few studies have considered both nutrient acquisition strategies in exploring the effects of long-term mowing on the nutrient acquisition of perennial herbs.MethodsWe measured root traits of absorptive roots and leaf nitrogen resorption efficiency (NRE) of seven herbaceous species with different plant height on a long-term mowing experimental platform (2003-2020) in a temperate steppe.ResultsWe found that root traits of tall and short species had little response to long-term mowing. While, mowing exerted opposite effects on leaf NRE of the two plant groups, i.e., mowing significantly decreased the NRE of tall species, but increased that of short species (except forPotentilla acaulis). Furthermore, root absorption capacity (indicated by root traits) was positively correlated with leaf NRE for tall species in control plots, but mowing eliminated this relationship. In contrast, for short species, root traits and leaf NRE had no correlation in control plots, while, mowing led to synergic relationship between root absorption capacity and leaf resorption rates.ConclusionsOur results suggested that perennial herbs changed the relationships between alternative resource acquisition strategies in response to long-term mowing in temperate steppe. These findings provide new perspectives for understanding the adaptation of herbaceous species to mowing in the temperate steppe.