| Effects of interspecific interactions on productivity of the intercropping system of intercropping Stylosanthes guianensis/Paspalum atratum |
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| DOI：10.7606/j.issn.1000-7601.2017.02.38 |
| Key Words: interspecific interactions intercropping system productivity soil nutrient |
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| Abstract: |
| To uncover effects of interspecific interactions on productivity of the intercropping system of intercropping Stylosanthes guianensis/Paspalum atratum, three treatments, respective monoculture of S.guianensis and P.atratum, P.atratum/S. guianensis reciprocal intercropping, were designed to observe difference in growth, biomass, and equivalent ratio of the biomass of the whole plant, phenology, as well as soil organic matter, total nitrogen and total phosphorus of sample plot under the three treatments in the whole growth period. The results showed the LER of biomass above-ground and underground was 3.05 and 3.52 respectively 270 days after planting in intercropping system and LER was greater than 1, which indicated that the intercropping system had its advantage. Compared with monoculture, phenology of P.atratum in intercropping system delayed for 5 days, and its growth and biomass were higher than those in monoculture. Its plant height, root length, dry yield and root yield were higher than those in monoculture by 9.67 cm, 7.33 cm, 345.50 g·strain-1, 131.67 g·strain-1 respectively. Compared with monoculture, the stage of branch, flower buds and flowering of S.guianensis in intercropping system delayed for 5 days, 15 days and 5～15 days respectively, and its growth and biomass were lower than those in monoculture. Its plant height, root length, root shoot ratio were lower than those in monoculture by 10.64 cm, 0.54 cm, 0.08, 0.84 grain·strain-1, 14.29 g·strain-1 and 1.48 g·strain-1. The increase in organic matter, total nitrogen and total phosphorus in the intercropping sample plot after planting was 0.039% 0.003% and 0.001%. The increase in organic matter and total nitrogen in monoculture of S.guianensis was 0.063% and 0.006% after planting. The total phosphorus decreased by 0.001% after planting. Organic matter and total nitrogen decreased in monoculture of P.atratum by 0.017% and 0.002% after planting. It was concluded that S.guianensis used phosphobacteria for nitrogen fixation in BNF process. Phosphorus consumption led to the decrease in total phosphorus and increase in total nitrogen in monoculture of S.guianensis. |
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