Mineral nitrogen dynamics in Dark Chestnut soil of Leymus chinensis grassland in the Xilin River Basin, China
Received date: 2004-07-16
Revised date: 2004-11-22
Online published: 2005-06-15
In the paper, the dynamic features of mineral nitrogen （SMN, NH+4-N+NO-3-N） of the 0-30cm Dark Chestnut soil were studied, its seasonal variations during growing season and the SMN content differences among different research points were analyzed. All the samples were taken randomly from three different managed Leymus chinensis grasslands of Xilin River Basin in Inner Mongolia of China. The results showed that in Dark Chestnut soil the prevailing form of SMN was NH+4-N,the plant available nitrogen only takes a very small part of the soil total nitrogen, always below 1%（0.20%～0.92%）.With the increase of grassland grazing intensity, the SMN content changed oppositely. The sequence of SMN content from high to low was: fenced grassland﹥rotational grazing grassland﹥random grazed grassland. During the growing season, the contents of NH+4-N and NO-3-N in different soil layers of three different managed grasslands changed evidently with the changes of soil temperature, moisture and plant absorbance, the trends of seasonal change were similar in different soil layers. The mineral nitrogen content of 0-10cm surface soils fluctuated most significantly, the content of NO-3-N was the highest in April and that of NH+4-N was higher in July and August. The content of NH+4-N was higher than that of NO-3-N in three different soil layers, and their contents decreased with the increase of sampling depth. The SMN content changed just the same order as the soil total nitrogen, organic carbon and soil water content with the increase of the depth, but there were no significant correlations between SMN content and anyone of them.
YANG Xiao-hong, DONG Yun-she, QI Yu-chun, GENG Yuan-bo . Mineral nitrogen dynamics in Dark Chestnut soil of Leymus chinensis grassland in the Xilin River Basin, China[J]. GEOGRAPHICAL RESEARCH, 2005 , 24(3) : 387 -393 . DOI: 10.11821/yj2005030007
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