Chinese Journal of Plant Ecology >
Effects of intercropping on photosynthetic rate and net photosynthetic nitrogen use efficiency of maize under nitrogen addition
Received date: 2018-01-30
Revised date: 2018-04-25
Online published: 2018-06-11
Supported by
Supported by the Yunnan Agricultural Joint Project(2017FG001-027);the Reserve Talent Young Academic and Technical Leaders of Yunnan Province(2017HB027);the National Natural Science Foundation of China(41201289);the National Natural Science Foundation of China(41361065)
Aims The aim of this study was to explore the response of photosynthetic carbon assimilation and photosynthetic nitrogen (N) use efficiency (PNUE) of maize to intercropping system of maize and potato under different N addition, which has a great significance for the N regulation and N fertilizer management for the increase in intercropping yield.
Methods In order to analyze the effects of intercropping and additional N level on leaf characteristics, photosynthetic parameters, PNUE and yield of maize, field experiment with mono- and inter-cropping system under four N addition levels (N0, 0 kg·hm -2, N1, 125 kg·hm -2, N2, 250 kg·hm -2 and N3, 375 kg·hm -2) treatments were set up.
Important findings The results showed that inter-cropping planting significantly increased leaf dry mass of maize and leaf mass per area compared with maize monoculture. Among different N treatment levels (except N3), leaf area of maize under intercropping close to potato increased compared with that under maize monoculture. Intercropping also increased the light saturation point of photosynthesis and dark respiration rate of maize compared with maize monoculture. PNUE decreased as the increasing of N levels in monoculture maize, intercropping maize leaves close to potato (I-P) and leaves close to maize of other row (I-M), and the largest decline was found in I-P. At the same N level (less than 250 kg N·hm-2), PNUE and photosynthetic rate (Pn) of maize in I-P were significantly higher than those in M and I-M system. Intercropping system significantly improve the yield of maize (land equivalent ratio > 1). This study concluded that higher PNUE and Pn of maize close to the potato contributed to the increase of intercropped maize yield under less than or equal to 250 kg N·hm-2 addition.
ZHU Qi-Lin, XIANG Rui, TANG Li, LONG Guang-Qiang . Effects of intercropping on photosynthetic rate and net photosynthetic nitrogen use efficiency of maize under nitrogen addition[J]. Chinese Journal of Plant Ecology, 2018 , 42(6) : 672 -680 . DOI: 10.17521/cjpe.2018.0033
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