He Xue-Fei, Huang Zhan, Zhang Wen-Tai, Chen Bo-Lang, Zhou Yan-Hui-Zi, Chai Zhong-Ping
College of Grassland and Environment Sciences, Xinjiang Agricultural University, Urumqi 830052, China.
Xinjiang Key Laboratory of Soil and Plant Ecological Processes, Urumqi 830052, China.
Ying Yong Sheng Tai Xue Bao. 2020 Aug;31(8):2637-2643. doi: 10.13287/j.1001-9332.202008.026.
Using C pulsed labeling technique, we examined the biomass and carbon accumulation of different organs as well as the distribution characteristics of C assimilate of 6-year-old Korla fragrant pear trees under three nitrogen application levels, ., 150, 300, and 450 kg N·hm (marked as N, N, and N, respectively). Results showed that the biomass, carbon accumulation, C fixation and leaf assimilation capacity of the whole pear tree increased while root to shoot ratio decreased with increasing nitrogen application. Both biomass and carbon accumulation amount of reproductive organs (., fruits) were the highest under N treatment. The C content and distribution rate of each organ changed dynamically along with increasing nitrogen application. At the new shoot growing stage, leaves and roots had stronger competitive abilities for photosynthate, with C distribution rates being the highest under N treatment. During fruit swelling and mature stages, leaves and fruits were more competitive, with C content and distribution rate in leaves being the highest under N treatment and those in fruits being the highest under N treatment. According to the absorption and distribution characteristics of carbon assimilate across organs under the three nitrogen application levels, the optimal nitrogen application level for achieving high fruit yield in the 6-year-old Korla fragrant pear tree orchard is recommended as 300 kg·hm .
采用¹⁴C脉冲标记技术，研究了3种施氮水平（分别为150、300和450 kg N·hm⁻²，标记为N₁、N₂和N₃）下6年生库尔勒香梨树不同器官的生物量、碳积累以及碳同化物的分配特征。结果表明，随着施氮量增加，整株梨树的生物量、碳积累、碳固定和叶片同化能力增强，根冠比降低。生殖器官（如果实）的生物量和碳积累量在N₂处理下最高。各器官的碳含量和分配率随施氮量增加而动态变化。在新梢生长期，叶片和根系对光合产物的竞争能力较强，N₁处理下碳分配率最高。在果实膨大期和成熟期，叶片和果实的竞争更强，N₂处理下叶片的碳含量和分配率最高，N₃处理下果实的碳含量和分配率最高。根据3种施氮水平下碳同化物在各器官的吸收和分配特征，推荐6年生库尔勒香梨园实现高产的最佳施氮水平为300 kg·hm⁻²。
