Distribution Characteristics of Soil Total Nitrogen in Low-efficiency Forest Land in the Northern Windy Desert Area of Jingbian County

[Objectives]The paper was to investigate the distribution characteristics of soil total nitrogen in low-efficiency forest land in the northern windy desert area of Jingbian County. [Methods]The distribution of soil total nitrogen in the 0-40 cm soil layer of 5 towns in the northern windy desert area of Jingbian County was studied through field sampling and laboratory detection. [Results]The average soil total nitrogen contents of Hongdunjie Town, Haizetan Town, Huanghaojie Town, Ningtiaoliang Town, Dongkeng Town and windy desert area in the 0-20cm soil layer were 0.259, 0.224, 0.242, 0.248, 0.431 and 0.275 g/kg, respectively. The soil total nitrogen content in Dongkeng Town was higher than those in other towns, while there was little difference among other regions. The average total nitrogen contents in the 20-40cm soil layer were 0.239, 0.285, 0.113, 0.262, 0.349 and 0.241 g/kg, respectively. The soil total nitrogen content in Huanghaojie Town was slightly lower than those in other towns, while that in Dongkeng town was higher. The variation coefficient of soil total nitrogen content in the survey area was greater than 30%, and there was great difference in spatial distribution. With the increase of soil depth, there was little change in soil total nitrogen content, namely the soil total nitrogen contents in 5 towns and windy desert area were not statistically different in the 0-40 cm soil layer. According to the nutrient grading standard of the second national soil survey, the soil total nitrogen content in the survey area was in the deficiency grade. [Conclusions]The research will provide a scientific guidance for the healthy and sustainable development of vegetation in arid regions.