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Response of nutrient resorption of Leymus chinensis to nitrogen and phosphorus addition in a meadow steppe of northeast China.
Plant Biology ( IF 4.2 ) Pub Date : 2020-06-28 , DOI: 10.1111/plb.13153 B Shi 1 , X Ling 1 , H Cui 1 , W Song 1 , Y Gao 1 , W Sun 1
中文翻译：
东北草甸草原羊草的养分吸收对氮，磷添加的响应
更新日期：2020-06-28
Plant Biology ( IF 4.2 ) Pub Date : 2020-06-28 , DOI: 10.1111/plb.13153 B Shi 1 , X Ling 1 , H Cui 1 , W Song 1 , Y Gao 1 , W Sun 1
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- Nutrient resorption, one of the most important strategies for plant nutrient conservation, is significantly affected by soil fertility. However, the effects of experimentally altered soil fertility on plant N and P resorption are poorly understood.
- The potential nutrient resorption response mechanisms of the dominant species Leymus chinensis to six N addition levels (0, 2.5, 5, 10, 20 and 40 g·N·m−2·year−1), two P addition levels (0 and 10 g P·m−2·year−1) and their interactions were studied after 3 years of treatments in a temperate meadow steppe.
- In both green leaves and culms, N and P addition significantly increased N and P concentrations, respectively. Nitrogen addition led to a decrease in the N resorption efficiency (NRE) of both leaves and culms. Within each N treatment, P addition decreased the P resorption efficiency (PRE) of both leaves and culms and the NRE of leaves, except in the N2.5 treatment. Both NRE and PRE in leaves were higher than those in culms under N and P addition conditions. The nutrient concentrations and resorption efficiency were significantly correlated with the soil nutrient availability.
- Our results suggest that plants rely more on nutrient absorption from the soil, reducing the proportion of elements obtained through nutrient resorption in nutrient‐rich environments.
中文翻译：
东北草甸草原羊草的养分吸收对氮，磷添加的响应
- 养分吸收是植物养分保护的最重要策略之一，其显着影响土壤肥力。但是，对土壤肥力的实验性改变对植物氮和磷吸收的影响知之甚少。
- 优势羊草对六个氮添加水平（0、2.5、5、10、20和40 g·N·m -2 ·年-1），两个磷添加水平（0和10的潜在养分吸收响应机制） g P·m -2 ·year -1）及其相互作用在温带草原草原上处理3年后进行了研究。
- 在绿叶和茎秆中，氮和磷的添加分别显着增加了氮和磷的浓度。氮的添加导致叶片和茎的氮吸收效率（NRE）降低。在每次N处理中，除N2.5处理外，添加P都会降低叶片和茎秆的P吸收效率（PRE）以及叶片的NRE。在氮和磷添加条件下，叶片的NRE和PRE均高于茎秆。养分浓度和吸收效率与土壤养分利用率显着相关。
- 我们的结果表明，植物更多地依赖于从土壤中吸收养分，从而减少了在养分丰富的环境中通过养分吸收而获得的元素比例。
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