施磷量对不同磷敏感棉花品种光合特性的影响
毕业论文关键词：棉花（Gossypium hirsutum L.）；施磷量；光合特性
Effects of Phosphorus application on Photosynthetic Characteristics of Two Cotton Cultivars with different Phosphorus Sensitivities
Abstract：The poverty of phosphorus (P) and the low utilization rate of phosphate fertilizer in our country cause the limitation of crop production. In order to explore the effects of phosphate fertilizer on different cotton cultivars with different P Sensitivities, pot experiment with five potassium levers (0、1.5、3.0、4.5、6.0 g P2O5 /pot) and two cotton cultivars (Yuzaomian 9110, P-tolerant cultivar; Lumian 54, P-sensitive cultivar) with different P sensitivities was conducted. Compared with 0 g P2O5 pot-1, the P application increased SPAD value, net photosynthetic rate (Pn), stomatal conductance(Gs), the primary light energy conversion efficiency of PS II in the dark (Fv/Fm), quantum yield of PS II; qP, coefficient of photochemical quenching(ΦPS II), the coefficient of non-photochemical quenching (qP) and electron transport rate (ETR) of cotton leaf in peak boll formation stage and boll opening stage. The P rate of 6.0 g P2O5 /pot was optimal among the five P rates. Compared with the P-sensitive cultivar, the P-tolerant cultivar possesses obviously higher SPAD value, Pn, Gs, ΦPS II, qP and ETR in middle and late growth stage in the treatment of 0 g P2O5 /pot. In conclusion, under the level of 6.0 g P2O5 /pot, the photosynthetic capability of cotton leaves were higher and photosynthetic duration was longer, which was conducive to the efficient utilization of P.
Key words: cotton; phosphorus fertilization; photosynthetic characteristic
目 录
摘要 1
关键词 1
Abstract 1
Key words 1
引言 1
1 材料与方法 2
1.1 实验设计 2
1.2 测定项目及方法 2
1.2.1 叶绿素含量（SPAD） 2
1.2.2 光合性能 2
1.2.3 叶绿素荧光参数 2
1.3 统计分析方法 2
2 结果与分析 2
2.1 施磷量对不同磷敏感品种棉花功能叶叶绿素含量(SPAD值)的影响 3
2.2 施磷量对不同磷敏感品种棉花功能叶净光合速率与气体交换参数的影响 3
2.3 施磷量对不同磷敏感品种棉花功能叶叶绿素荧光参数的影响 4
2.4 施磷量对不同磷敏感品种棉花功能叶光能吸收与分配的影响 5
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