Effects of salt and alkali stress on biomass and nitrogenous compounds of Kochia sieversiana

Seedlings of Kochia sieversiana were exposed to salt stress and alkali stress treatments. Differences in nitrogenous compound accumulation in K. sieversiana under salt and alkali stress were investigated by determining and analyzing the changes in biomass and contents of nitrogenous compounds, among other factors. The results showed that treatment with both salt and alkali stress inhibited the biomass accumulation of K. sieversiana, with the inhibition effects of alkali stress being more serious than those of salt stress. Contents of nitrogenous compounds, such as NO₃^–-N, NH₄⁺-N, proline, and betaine, among others, in K. sieversiana shoots were affected by increasing duration of salt and alkali stress. The effects of alkali stress was more severe than those of salt stress. Therefore, alkali stress strongly disturbs nitrogen metabolism in K. sieversiana. The regulation mechanism of nitrogen metabolism in K. sieversiana in response to alkali stress is extremely complex and requires further analysis.