The Differences in Root Traits and Photosynthesis of Wheat in Lime Concretion Black Soil under Long-term Different Fertilization Patterns

doi:10.7668/hbnxb.2016.03.026

Abstract

Abstract: In order to clarify the difference in the effects of long-term single fertilization model,we studied the effects of five kinds of long-term(34 years)located fertilization models on root traits,photosynthesis and yield of wheat in lime concretion black soil.The results showed that the root traits of CK(no fertilizer application)was the worst,the total root length,total root surface area,total root volume and total root tips of MNPK(mixed application of organic and chemical fertilizer with the same amount of nitrogen)and HMNPK(mixed application of organic and chemical fertilizer with the larger amount of nitrogen)were significant higher than that of NPK(application of single chemical fertilizer)and M(application of single organic fertilizer),in addition,the differences between NPK and M in total root surface area,average root diameter and total root volume were insignificant.When compared to long-term application of single chemical fertilizer(NPK)and organic fertilizer(M),the treatment of long-term mixed application of organic and chemical fertilizer(MNPK and HMNPK)could help to enhance the top-three leaves width and length of wheat.At booting stage,the photosynthetic rate,stomatal conductance and transpiration rate of MNPK were the highest,but there was no significant difference with HMNPK;at middle of filling stage(MNPK and HMNPK happen lodging),the photosynthetic characteristics of NPK and M were better than that of MNPK and HMNPK,and the photosynthetic characteristics of MNPK was also better than that of HMNPK(the most serious lodging).At booting stage,compared to long-term application of single chemical fertilizer and organic fertilizer,the treatment of mixed application of organic and chemical fertilizer could help to improve wheat chlorophyll fluorescence parameters;At middle of filling stage,the chlorophyll fluorescence parameters of M was perform the best,and the Φ_psⅡ,Fv/Fm,ETR,qP of MNPK were significant higher than that of HMNPK.Total root length,total root surface area,average root diameter,total root volume,total root tips were significantly or markedly significantly positively correlated to leaf length and width with high efficiency of photosynthesis and yield;Root traits,yield were significantly or markedly significantly positively correlated to photosynthetic characteristics and chlorophyll fluorescence parameters Fm,Φ_psⅡ,Fv/Fm,ETR,qP,while markedly significantly negatively correlated to intercellular CO₂ concentration,Fo,qN.The findings showed that although mixed application of organic and chemical fertilizer could help to improve root and leaf length and width with high efficiency of photosynthesis of wheat,mixed application of organic and chemical fertilizer with the larger amount of nitrogen might lead to lodging when encountered unusual weather due to higher fertility,and result in a decline of photosynthesis rate.

Key words: Root traits, Leaf length and width, Photosynthetic characteristics, Chlorophyll fluorescence

CLC Number:

S143
S512.01

ZHANG Xiangqian, CAO Chengfu, ZHANG Cunling, QIAO Yuqiang, DU Shizhou, LI Wei, ZHAO Zhu, CHEN Huan. The Differences in Root Traits and Photosynthesis of Wheat in Lime Concretion Black Soil under Long-term Different Fertilization Patterns[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2016, 31(3): 175-183. doi: 10.7668/hbnxb.2016.03.026.

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