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

引用

Journal of Plant Ecology 2022年第2期15卷 223-236页

作者： Wei-Ping Zhang Dario Fornara Guang-Cai Liu Josep Peñuelas Jordi Sardans Jian-Hao Sun Li-Zhen Zhang Long Li Beijing Key Laboratory of Biodiversity and Organic Farming Key Laboratory of Plant and Soil InteractionsMinistry of EducationDepartment of Ecology and Ecological EngineeringCollege of Resource and Environmental ScienceChina Agricultural UniversityBeijing 100193China Sustainable Agri-Food Science Division Agri-Food&Biosciences InstituteBT95PX BelfastUK CSIC Global Ecology Unit CREAF-CSIC-UAB08913 BellaterraCataloniaSpain CREAF 08913 Cerdanyola del VallèsCataloniaSpain Institute of Soil Fertilizer and Water-Saving AgricultureGansu Academy of Agricultural SciencesLanzhou 730070China Gansu Agro-technology Extension Station Lanzhou 730020China

Quantifying stoichiometry of crop N and P acquisition(*** from farmland)under different agronomic practices is essential for understanding nutrient budgets and optimizing N and P fertilizer application in *** 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 ***,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 ***-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 ***-level N:P ratios of the two intercrops were different from those of the corresponding monoculture at ***(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.

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

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