Leaf resorption and stoichiometry of N and P of 1, 2 and 3 year-old lucerne under one-time P fertilization

文献类型： 外文期刊

第一作者： Lu, Jiaoyun

作者： Lu, Jiaoyun;Liu, Minguo;Yang, Mei;Yang, Huimin;Lu, Jiaoyun;Xie, Junhong;Li, Lingling

作者机构：

关键词： Alfalfa; Stand age; One-time P fertilization; Nutrient resorption; Relative nutrient limitation

期刊名称：SOIL & TILLAGE RESEARCH （ 影响因子：5.374； 五年影响因子：6.368 ）

ISSN： 0167-1987

年卷期： 2020 年 197 卷

页码：

收录情况： SCI

摘要： Nutrient resorption is one of the key processes of a plant to conserve nutrients and to less depend on soil nutrient availability, which makes the plant more adaptive to adverse environments. Understanding of the effect of phosphorus (P) fertilization on leaf nutrient resorption of legume species is still limited. The aim was to test the responses of leaf nutrient resorption and stoichiometry to immediate and post effects of P fertilization in the Loess Plateau of China where soil P availability is largely restricted due to soil erosion and drought. Nitrogen resorption efficiency (NRE), P resorption efficiency (PRE), green leaf N:P (N:P-gr) and senesced leaf N:P (N:P-sen) were investigated in 1-3 year lucerne (Medicago sativa L.), a widely used forage in this rainfed region. The NRE and PRE increased with stand age increase from 1 to 3 years. The P fertilization had no effect on NRE, but significantly affected PRE. The PRE increased with P fertilization in the first year and PRE was the highest at 60 kg P2O5 ha(-1) in the second and third years. The N:P-gr decreased and N:P-sen increased with stand age, suggesting more P limitation along lucerne growth. The one-time P fertilization imposed no impacts on NRE but on PRE in an age-specific way. Compared with N:P-gr, N:P-sen, may be more representative to show relative nutrient limitation in soils. Leaf nutrient resorption changed with leaf N:P which indicates the shift of relative nutrient limitation of soils. The P fertilization at 60 kg P2O5 ha(-1) could guarantee the greatest PRE, equal NRE and higher dry biomass production in this region. Considering P resource finiteness and production cost, reduced amount or frequency of P fertilization is a desirable way of management for lucerne production in the Loess Plateau of China.

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