氮磷追肥配施对云南松幼苗根系生长的影响

云南松是我国西南地区主要的造林树种,在区域经济发展和生态环境建设中发挥着重要作用。但目前云南松苗期生长缓慢,这使得云南松经济效益与生态效益的发挥受到了阻碍。氮磷添加是目前农林业促成培育中一种常见技术手段,通过对云南松苗木在不同氮、磷施肥处理下其生长状况的研究,以期为云南松苗木培育提供依据。本次试验以90d生的云南松幼苗为试验材料,对其进行氮磷根部追肥配施试验,比较不同氮磷浓度水平下云南松幼苗根系生长的变化规律。研究表明,氮磷配施后,随着氮磷用量的增加,云南松幼苗根冠比降低。地下部分的生长优势降低,地上部分的生长优势升高,且氮元素对于地上部分的增长作用强于磷元素。

Effects of nitrogen and phosphorus on the root growth of Pinus yunnanensis seedlings

Pinus yunnanensis was the main economic tree species in southwest China and played an important role in regional economic development and ecological environment construction. But at present, the phenomenon of seedling squatting was very easy to occur after afforestation of Pinus yunnanensis, which hinders the development of its economic and ecological benefits. Nitrogen and phosphorus topdressing and application was a common technical means to promote plant growth in current agroforestry technology. Through the study on the growth status of Pinus yunnanensis under different nitrogen and phosphorus concentrations, it will be helpful to determine the nitrogen and phosphorus content suitable for the growth of Pinus yunnanensis, and then solve the problem of slow growth of Pinus yunnanensis when the phenomenon of crouching seedlings occurs. In this experiment, 90-day-old Pinus yunnanensis seedlings were used as experimental materials to carry out nitrogen and phosphorus root topdressing experiment. The growth and biomass of Pinus yunnanensis seedlings under different nitrogen and phosphorus concentrations were compared. The main results showed nitrogen and phosphorus can promote the growth of aboveground parts of plants. When comparing the root-shoot ratio of Pinus yunnanensis seedlings, it was found that the ratio of nitrogen to phosphorus increased with the increase of nitrogen and phosphorus. reduce. The growth advantage of the underground part was reduced, and the growth advantage of the aboveground part was increased. And in the experiment, it was found that the growth of nitrogen on the aerial part is stronger than that of phosphorus.