贵州黄壤小白菜生长、品质、光合特性及氮素利用对新型肥料的响应

Response of Chinese cabbage growth, quality, photosynthesis and nitrogen utilization to new fertilizers in Guizhou yellow soil

  • 摘要: 为探究不同新型肥料对贵州省酸性黄壤小白菜产量、品质、光合特性及肥料利用的影响, 同时筛选出适合贵州黄壤施用的新型肥料产品, 以贵州酸性黄壤为基础, 通过盆栽试验设置对照(CK, 不施氮肥)、西洋复合肥(常规施肥)、保水型功能性肥和稳定性缓释肥4个处理, 研究了新型肥料对小白菜产量、品质、光合特性以及养分吸收利用的影响。结果表明: 施用保水型功能性肥和稳定性缓释肥可显著增加小白菜播种后34 d的生物量, 较常规施肥处理相比鲜重分别增加4.16%和22.28%, 干重分别增加41.55%和62.35%; 施用新型肥料还可以改善小白菜的营养品质, 与常规施肥处理相比, 保水型功能性肥可显著降低硝酸盐含量18.61%, 而还原性糖、Vc和游离氨基酸含量分别增加25.74%、130.95%和16.91%; 而稳定性缓释肥则使硝酸盐、还原糖和Vc含量分别提高26.68%、15.35%和50.00%, 但是游离氨基酸含量则较常规施肥相比降低14.43%; 而且新型肥料还增强了小白菜叶片的光合能力(净光合速率Pn、气孔导度gs、胞间CO2浓度Ci以及蒸腾速率Tr), 其中以稳定性缓释肥处理的小白菜光合能力最佳, 且气孔因素是导致净光合速率增加的主要原因。施用新型肥料小白菜对氮素的吸收显著增加, 氮肥利用效率显著提高, 新型肥料处理的氮肥农学效率(AEN)、偏生产力(PFPN)、生理利用率(PEN)和表观利用率(REN)平均分别为48.30 -1、59.85-1、95.46 -1和52.79%, 以稳定性缓释肥处理的氮肥利用效率最佳, 尤其是氮肥表观利用率达66.66%。此外, 相关性分析结果显示, 小白菜产量与叶片净光合速率Pn、气孔导度gs以及蒸腾速率Tr均呈显著正相关关系, 说明提高小白菜叶片的气体交换参数PngsTr可以增加小白菜产量; 同时小白菜叶片氮含量与氮肥生理利用率和氮肥表观利用率存在极显著相关性, r值分别为0.937和0.978, 表明增加小白菜叶片氮含量可以提高小白菜对氮肥的利用效率。综上所述, 新型肥料对贵州酸性黄壤上小白菜的生物增产效应以及光合特性提高等效果显著, 可为将来在贵州农业生产中推广应用提供参考和理论依据。

     

    Abstract: The effects of new fertilizers on the yield, quality, photosynthetic characteristics and fertilizer utilization of Chinese cabbage in Guizhou acid yellow soils were investigated in a pot experiment. The soil used in the experiment was typical yellow soil with pH 6.08, collected from the experimental base of Academy of Agricultural Sciences of Guizhou. The four treatments studied in the experiment included the contrast treatment (CK, no nitrogen fertilizer), compound fertilizer (FH, conventional fertilizer), water retaining fertilizer (BS) and stable slow-release fertilizer (WD). The biomass, contents of nitrate, reducing sugar, Vc and free amino acid as well as leaf gas exchange parameters and nitrogen content and utilization of Chinese cabbage were investigated at different times after sowing. The results showed that at 34 days after sowing, BS and WD treatments significantly increased Chinese cabbage biomass. Compared with FH treatment, BS and WD treatments increased Chinese cabbage fresh weights by 4.16% and 41.55%, and dry weights by 22.28% and 62.35%, respectively. Application of new fertilizers also improved nutritional quality of Chinese cabbage. Compared with FH treatment, BS treatment significantly reduced nitrate content by 18.61% while increased contents of reducing sugar, Vc and free amino acid, respectively, by 25.74%, 130.95% and 16.91%. However, WD treatment increased nitrate, reducing sugar and Vc contents, respectively, by 26.68%, 15.35% and 50.00%, while decreased free amino acid content by 14.43%. The application of the new fertilizers also enhanced the photosynthetic capacity of Chinese cabbage leaves, including the net photosynthetic rate (Pn), stomatal conductance (gs), intercellular CO2 concentration (Ci) and transpiration rate (Tr), forwhich WD treatment had the best performance. The stomata regulation was the main enhancement factor for photosynthetic capacity. Nitrogen uptake of Chinese cabbage obviously increased and nitrogen use efficiency apparently enhanced as well. Average agronomic nitrogen efficiency (AEN), partial factor productivity (PFPN), physiological utilization (PEN) and recovery efficiency (REN) for new fertilizer treatments were respectively 48.30 kg.kg-1, 59.85kg.kg-1, 95.46 kg.kg-1 and 52.79%. Then the treatment with the best efficiency was WD treatment, especially for nitrogen recovery efficiency (which was 66.66%). Correlation analysis showed that yield and net photosynthetic rate (Pn), stomatal conductance (gs) and transpiration rate (Tr) had significant positive correlations. This suggested that improvement in net photosynthetic rate (Pn), stomatal conductance (gs) and transpiration rate (Tr) increased yield of Chinese cabbage. Concurrently, there was a significant correlation between nitrogen content, physiological utilization (PEN) and recovery efficiency (REN), with r values of 0.937 and 0.978, respectively. This suggested that increase in nitrogen content improved nitrogen utilization efficiency. Furthermore, the new fertilizers significantly enhanced biological yield and photosynthetic characteristics of Chinese cabbage in Guizhou acid yellow soils. The study laid a solid scientific reference and theoretical basis for future applications of new fertilizers in agricultural production in Guizhou Province.

     

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