玉米行距配置对套作大豆生物量、根系伤流及养分的影响

doi:10.3864/j.issn.0578-1752.2016.20.019

Abstract

Abstract: 【Objective】 Soybean (Glycine max (L.) Merr.) is an important N-fixing crop, and is a major oilseed crop produced and consumed for protein and oil throughout the world. How maize planting patterns affect the root biomass, bleeding sap and nutrient of soybean were analyzed under maize-soybean relay strip intercropping systems. This study will provide a theoretical basis for reasonable group configuration of maize-soybean strip intercropping. 【Method】The experiment was conducted in 2012-2013 to analyze the effect of maize row-spacing patterns on soybean root biomass, accumulation of N, P and K, bleeding intensity and bleeding sap components at V3, V5 and R2 stages under maize- soybean relay strip intercropping systems. This experiment comprised three maize and soybean intercropping systems and one sole soybean treatment with three replications. Maize cultivar Chuandan418, and soybean cultivar Nandou12 were used as materials. The following maize planting patterns were adopted: A1 (20 cm+180 cm, 20 cm narrow row and 180 cm wide row), A2 (40 cm +160 cm), A3 (60 cm+140 cm). Maize-to-soybean row ratio was also 2:2. Soybean was planted in the wide rows before the reproductive stage of maize. 【Result】 Above-ground biomass, below-ground biomass and root accumulation of N, P and K in soybean were decreased with increasing maize narrow-row spacing, and these parameters under intercropping conditions were less than those of monoculture significantly (P<0.05). Root bleeding intensity of soybean was decreased from V3 to R2 stages, opposite trends were appeared from A1 to A3 treatments at the same growth stage. No significant difference of root bleeding intensity was found in A1 and A2 treatments (P>0.05). Root bleeding intensity at V3, V5 and R2 stage in A1 treatment was decreased by 27.69%, 26.11% and 23.23% compared with those of monoculture, respectively. Nitrate nitrogen, total phosphorus, total potassium, soluble sugar content of bleeding sap and bleeding intensity of soybean root increased gradually with increasing the soybean growth stages except the ammonium nitrogen content. The correlation among root nutrient accumulation, bleeding intensity, bleeding sap component concentration, above-ground and below-ground biomass were significant (P < 0.01). 【Conclusion】Therefore，planting pattern affect the soybean biomass and root bleeding intensity in maize-soybean relay strip intercropping system, this will influence the nutrient absorption and matter transport of soybean root.

Key words: maize, soybean, relay intercropping, biomass, root bleeding sap, nutrient

YANG Feng, LOU Ying, LIU Qin-lin, FAN Yuan-fang, LIU Wei-guo, YONG Tai-wen, WANG Xiao-chun, YANG Wen-yu. Effect of Maize Row Spacing on Biomass, Root Bleeding Sap and Nutrient of Soybean in Relay Strip Intercropping Systems[J].Scientia Agricultura Sinica, 2016, 49(20): 4056-4064.

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Effect of Maize Row Spacing on Biomass, Root Bleeding Sap and Nutrient of Soybean in Relay Strip Intercropping Systems

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