Preliminary Investigation On The Response Of Moss Crusts Growth To Nitrogen Deposition And Its Application In Desertification Control

With the intensification of global changes,both soil erosion and desertification in desert ecosystems are undergoing serious changes.Biological soil crusts distributed in desert ecosystems improve the resistance of soil to wind erosion and play an important role in stabilizing sand surfaces.The research on the changes of moss crusts in desert areas subject to nitrogen addition and its application in desertification control can provide experimental basis and data support for the restoration of deserts.Atmospheric nitrogen content is one of the factors affecting this global change.Nitrogen concentration can affect the growth of this plant,nutrient distribution and interface circulation.At the same time,preliminary research focused on planting,forests and grasslands and other ecosystems.In this study,The results of the study showed that the morphological characteristics of mosses(plant density,plant height,stem and leaf angle)were most affected at the N addition concentration of 1 g N,and the morphological characteristics of mosses(leaf width,leaf length,hair tip length)were most significantly inhibited at the N addition concentration of 3 g N·at this time.N and P contents of above-ground parts of moss plants were significantly higher than those of below-ground parts,and this difference was not affected by the increase of N deposition.With the increase of nitrogen deposition,the nitrogen and phosphorus contents of above-and below-ground parts of moss basically showed an increase followed by a decrease,and high nitrogen(1.5 g N-3 g N)concentration inhibited the uptake of nitrogen and phosphorus by moss.Nitrogen addition on total nitrogen and total phosphorus of mosses,showed promotion and then inhibition,with the greatest effect at nitrogen concentrations of 1 and 1.5 g N.Culture in substrate blocks showed the best expansion of mosses when treated whole and the greatest effect on cover,and fragmentation culture was more effective in both sand and substrate blocks in terms of population density compared to whole culture.In sand-cultured mosses,the addition of water retention agents significantly affected both YII and Fv/Fm to shorten the cycle time.Understanding the victorious ecological influence pattern of moss crust on the increase of nitrogen deposition in desert ecosystem can help us better manage land desertification and provide theoretical and practical guidance significance for the subsequent desertification control.