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结合塔克拉玛干沙漠南缘策勒绿洲外围地下水盐分含量,于2006年8~10月在策勒绿洲前沿实验研究了一年生骆驼刺幼苗在不同NaCl处理条件下的生理响应和适应性,探讨了NaCl对骆驼刺幼苗生长状况的影响.研究结果表明:随着NaCl处理浓度的增加,骆驼刺幼苗的水势和净光合速率降低,气孔导度和胞间CO2浓度也表现出相似的变化规律,而气孔限制值则随处理浓度的增加而增大;骆驼刺幼苗的生物量随NaCl处理浓度的增加而显著减少.NaCl处理50天,Na+在骆驼刺幼苗体内各器官的含量基本为:小枝>茎>叶>根,Cl-在骆驼刺幼苗体内的分布为:地上部分>根.NaCl处理50天,水势降低造成的气孔限制仍然是影响骆驼刺幼苗光合作用的主要因素;随着NaCl处理时间的增长,骆驼刺幼苗的水势和净光合速率总体呈下降趋势;处理50天,150和250mmol·L-1处理水平下骆驼刺幼苗的清晨水势略高于处理30天,这可能是骆驼刺幼苗对盐环境有一定适应的结果.3个NaCl处理水平下,骆驼刺幼苗从处理30天到50天保持较稳定的生长,其根冠比随处理时间的延长而增大,但增加的幅度不尽一致,150和250mmol·L-1处理水平下的根冠比相比50mmol·L-1处理水平有较大幅度的增加.结果显示:骆驼刺幼苗有较强的耐盐性和适盐能力,能够在中等浓度的盐分环境中生存.
According to the salinity content of groundwater in the Cele oasis on the southern margin of Taklamakan Desert, the physiological response and adaptability of annual camellia seedlings under different NaCl treatments were studied at the front of Cele oasis from August to October in 2006. The results showed that with the increase of NaCl concentration, the water potential and net photosynthetic rate decreased, and the stomatal conductance and intercellular CO2 concentration also showed similar changes, and the stomatal limitation value The biomass of Alhagi sparsifolia seedlings decreased significantly with the increase of NaCl concentration.The content of Na + in organs of Alhagi sparsifolia seedlings was basically as follows: twig> stem> leaf> The distribution of Cl- in the body of Alhagi sparsifolia was: aerial part> root.NaCl treatment for 50 days, stomatal limitation caused by decreased water potential was still the main factor affecting the photosynthesis of Alhagi sparsifolia seedlings. With the increase of NaCl treatment time, The water potential and net photosynthetic rate of thorns seedling generally showed a decreasing trend. The water stress of camel saplings at 50 days and 150 and 250 mmol·L-1 treatments was slightly higher than that of 30 days Can Alhagi tabacum seedlings have some adaptation to the salt environment results.At three NaCl treatment levels, camel seedlings from the treatment of 30 days to 50 days to maintain a more stable growth, the root-to-shoot ratio increased with the treatment time, But the increasing range was not consistent, the root-crown ratio at 150 and 250 mmol·L-1 treatment increased significantly compared with that at 50 mmol·L-1 treatment.The results showed that the salt tolerance of salt-tolerant seedlings was higher Sexual and salt-tolerant ability to survive in moderate salt concentrations.