绢蒿荒漠草地两种主要植物的生态化学计量特征分析

Study on Ecological Stoichiometry of Two Plants in Seriphidium transiliense Desert Grassland

【目的】研究退化伊犁绢蒿荒漠草地恢复后,主要植物的生态化学计量特征的变化,为干旱区草地恢复提供理论依据。【方法】以该草地的建群种伊犁绢蒿(Seriphidium transiliense)和伴生种木地肤(Kochia prostrata)为对象,分析两种植物的C、N、P、K含量及计量比以及放牧和封育条件下,两种植物的生态化学计量特征,研究两种植物的养分利用策略以及封育对两种植物的生态化学计量特征的影响。【结果】伊犁绢蒿的P(0.82 g/kg)极显著高于木地肤的P(0.58 g/kg),伊犁绢蒿的N(15.11 g/kg)、K(13.06 g/kg)含量和N/P(22.46)极显著低于木地肤的N(25.14 g/kg)、K(21.17 g/kg)含量和N/P(43.75)。封育改善了荒漠草地植物的生长环境,但与放牧相比,伊犁绢蒿与木地肤的C、N、P、K含量及元素计量比变化不显著。【结论】伊犁绢蒿与木地肤的养分利用策略不同,伊犁绢蒿以吸收利用P为主,木地肤以吸收利用N和K为主,伊犁绢蒿的生长率高于木地肤。封育对荒漠草地两种植物的生态化学计量特征影响不显著。

【Objective】 To study the changes of the ecological stoichiometry of the major plants in the restoration of the degraded Seriphidium transiliense desert grassland in the hope providing the theoretical basis for the grassland restoration in the arid region.【Method】S. transiliense and Kochia prostrata in desert grassland were taken as the research objects to study the nutrient utilization strategies of the two plants and the effects of enclosure on the eco-stoichiometric characteristics of the two plants, the contents of C, N, P, K and stoichiometric ratios were analyzed, and the eco-stoichiometric characteristics were compared under grazing and enclosure conditions.【Result】The P(0.82 g/kg) content of S. transiliense was significantly higher than that of K. prostrata(0.58 g/kg), but the N(15.11 g/kg) and K(13.06 g/kg) contents and N/P(22.46) of S. transiliense were significantly lower than thaose of K. prostrata N(25.14 g/kg), K(21.17 g/kg) and N/P(43.75)(P<0.01). Enclosure improved the environment of desert grassland, but compared with grazing, the C, N, P, K contents and stoichiometric ratios of the two plants were not significant.【Conclusion】The nutrient utilization strategies of S. transiliense and K. prostrata are different. S. transiliense mainly absorbs P, while K. prostrata mainly absorbs N and K. The growth rate of S. transiliense is higher than that of K. prostrata. The eco-stoichiometric characteristics of the two plants are not significantly affected by enclosure.