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在新疆尉犁县的防护林带内,乔木的主栽树种是4种杨树,包括中天杨(Populus×xiaozhuanica“Zhongtian”)、新疆杨(Populus alba var.pyramidalis)、银新杨(Populus alba×Populus alba var.pyra-midalis)和胡杨(Populus euphratica)。文中选择叶片脯氨酸含量、K+/Na+、Cl-含量、SOD(超氧化物歧化酶)活性、MDA(丙二醛)含量和δ13C值等6个生理生态指标,对4种杨树苗期的耐盐性进行综合评价,为尉犁县建立耐盐型防护林选择适宜树种提供依据。研究的初步结论是中天杨和胡杨的耐盐性较强,所受的土壤盐胁迫较轻,表现在叶片MDA含量较低,δ13C值较高。但是二者的耐盐机理不同,中天杨主要通过提高叶片的Cl-含量和SOD活性耐盐,而胡杨主要通过增加叶片脯氨酸含量和K+/Na+来耐盐。
Among the shelterbelts in Yuli County, Xinjiang, four main poplar trees were poplar, including Populus × xiaozhuanica “Zhongtian”, Populus alba var. Pyramidalis, Populus alba × Populus alba var. pyra-midalis and Populus euphratica. In this paper, six physiological and ecological indexes, such as proline content, K + / Na +, Cl- content, SOD activity, MDA content and δ13C value, Salt tolerance of a comprehensive evaluation for the establishment of salt-resistant shelterbelt Yuli county to choose the appropriate species to provide the basis. The preliminary conclusion of this study is that the salt tolerance of Populus euphratica and Populus euphratica is relatively strong, and the soil salt stress is mild, which is characterized by lower MDA content and higher δ13C value. However, both of them have different mechanism of salt tolerance. Populus euphratica can tolerate salt mainly by increasing Cl-content and SOD activity of leaves, while Populus euphratica can tolerate salt mainly by increasing proline content and K + / Na + in leaves.