| Influence of allocation models on characteristics of photosynthes is and dry matter accumulation in cotton intercropped with jujube |
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| DOI：10.7606/j.issn.1000-7601.2013.06.006 |
| Key Words: jujube cotton intercropping allocation model planting density photosynthesis dry matter accumulation Xinjiang |
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| Abstract: |
| By using different planting densities with wide narrow row (45 cm+15 cm) and even row space (30 cm), the effects of allocation models on characteristics of photosynthesis and dry matter accumulation in cotton intercropped with jujube were investigated in Xinjiang. The results showed that:
(1) The difference of leaf area index (LAI), SPAD and net photosynthesis rate (Pn) in cotton did not reach significant level before full bloom stage among different allocation models, while it was opposite after full bloom stage. (2) The change of Pn in cotton was parabolic, and it was higher in outer canopy than in lower canopy during the whole growth period. During bud stage,
the Pn was relatively high under low density with even row space, and it tended to decrease with the increase of planting density. The Pn reached the peak values at full bloom stage, in which the highest value was 34 μmol·m-2·s-1 under middle density with wide narrow row. During full boll stage and boll opening stage, the Pn was the highest under
high density with wide narrow row. (3) High planting density was beneficial to decrease t0 and increase Vm under wide narrow row. The maximum value of Vm under high planting density was 269.8 kg·d-1, being 11% and 52.8% higher, respective, than that under middle and low planting density. The value of Vm under middle and low planting density with even row space was higher than that with wide narrow row, but it was opposite under high planting density. The value of △t, t1 and t2 were sequenced as: high density＞middle density＞low density. Therefore, it was suitable to plant cotton in high planting density with wide narrow row in jujube cotton intercropping system. |
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