Interspecific interactions affect N and P uptake rather than N:P ratios of plant species: evidence from intercropping
Zhang, Wei-Ping (China Agricultural University)
Fornara, Dario (Agri-Food and Biosciences Institute)
Liu, Guang-Cai (China Agricultural University)
Peñuelas, Josep (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Sardans i Galobart, Jordi (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Sun, Jian-Hao (Gansu Academy of Agricultural Sciences)
Zhang, Li-Zhen (China Agricultural University)
Li, Long (China Agricultural University)

Data:	2021
Resum:	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.
Ajuts:	European Commission 610028
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Ecological stoichiometry ; Growth-rate hypothesis ; Intercropping system ; Interspecific competition ; Nitrogen addition ; Nutrient budget ; Plastic film mulch
Publicat a:	Journal of Plant Ecology, Vol. 15, Issue 2 (April 2021) , p. 223-236, ISSN 1752-993X

DOI: 10.1093/jpe/rtab084

14 p, 2.4 MB

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