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Interspecific interactions affect N and P uptake rather than N:P ratios of plant species: evidence from intercropping

文献类型： 外文期刊

作者： Zhang, Wei-Ping 1 ; Fornara, Dario 2 ; Liu, Guang-Cai 1 ; Penuelas, Josep 3 ; Sardans, Jordi 3 ; Sun, Jian-Hao 5 ; Zhang, Li-Zhen 1 ; Li, Long 1 ;

作者机构： 1.China Agr Univ, Coll Resource & Environm Sci, Dept Ecol & Ecol Engn,Key Lab Plant & Soil Intera, Beijing Key Lab Biodivers & Organ Farming,Minist, Beijing 100193, Peoples R China

2.Agrifood & Biosci Inst, Sustainable Agrifood Sci Div, Belfast BT9 5PX, Antrim, North Ireland

3.CREAF CSIC UAB, Global Ecol Unit, CSIC, Bellaterra 08913, Catalonia, Spain

4.CREAF, Cerdanyola Del Valles 08913, Catalonia, Spain

5.Gansu Acad Agr Sci, Inst Soil Fertilizer & Water Saving Agr, Lanzhou 730070, Peoples R China

6.Gansu Agrotechnol Extens Stn, Lanzhou 730020, Peoples R China

关键词： ecological stoichiometry; growth-rate hypothesis; intercropping system; interspecific competition; nitrogen addition; nutrient budget; plastic film mulch

期刊名称：JOURNAL OF PLANT ECOLOGY （ 影响因子：1.78； 五年影响因子：2.674 ）

ISSN： 1752-9921

年卷期： 2022 年 15 卷 2 期

页码：

收录情况： SCI

摘要： Quantifying stoichiometry of crop N and P acquisition (i.e. removal from farmland) under different agronomic practices is essential for understanding nutrient budgets and optimizing N and P fertilizer application in agroecosystems. It is not clear how plant N and P uptake and N:P stoichiometry vary between monoculture and intercropping throughout an entire growing season under different N fertilization and mulching practices. Here, we addressed how plant interspecific competition for nutrients have affected the temporal dynamics of crop N and P uptake (and N:P ratios) in five cropping systems (wheat, maize and barley monocultures, and wheat/maize and barley/maize intercropping), under two N levels (0 and 225 kg N ha(-1)) and two maize mulching treatments (with and without). Wheat and barley had greater N and P competitive ability than maize, leading to an increase in N and P uptake of wheat and barley and a decrease in N and P uptake of maize during co-growth stages in intercropping. N:P ratios of three crop species decreased with plant growth. Crop-level N:P ratios were either not affected by intercropping or did not change consistently with N fertilization while film mulching decreased maize N:P ratios. Community-level N:P ratios of the two intercrops were different from those of the corresponding monoculture at maturity. Because (i) the proportion of N and P removal from intercropping differs from monocultures, and (ii) N and P uptake by crops is decoupled under N fertilization and mulching, these findings may have practical implications for the nutrient budget of intercropping systems.

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