Regional distribution regularities on soil C / N have been a hot topic in recent years, but currently there were few studies reporting the soil C / N distribution in alpine steppe ecosystem under different vegetation zones in Qinhai鄄Tibetan plateau. In order to reveal the spatial distribution characteristics of the soil C / N on the alpine steppe ecosystem in different vegetation zones, and to provide scientific basis for understanding a regional specific acclimation of vegetation to climate change in Qinhai鄄Tibetan plateau, we surveyed the soil C / N of alpine steppe ecosystem under different vegetation zones. Collectively, we sampled 67 sampling points. The soil C / N of the alpine steppe ecosystem in Qinhai鄄Tibetan plateau was also compared with that of 14 natural transects in areas outside the plateau. The results showed that: (1) Along the horizontal direction in Qinhai鄄Tibetan plateau, C / N appeared higher in northwest and lower in southeast. The higher C / N appeared mainly in the regions with a concentration in the hinterland of northern part of Tibetan Plateau and in the lake basin region of the northern foot of Himalayas. There were significant differences of C / N among different grassland types and natural transects. (2) Along the vertical direction of the soil profiles from aboveground to underground, it could be divided into 5 types of low鄄high鄄low, from high to low, from low to high, high鄄low鄄high鄄low and high鄄low鄄high of C / N distribution patterns among different grassland types and natural transects, and there was significant difference of C / N between the 6 6 摇 22 期 摇 摇 摇 王建林摇 等:青藏高原高寒草原生态系统土壤碳氮比的分布特征 摇
Both nitrogen (N) deposition and livestock grazing are important factors influencing species composition, soil nutrient availability, plant productivity and allocation pattern in grassland ecosystems. However, little is known about their interactive effects on alpine ecosystem carbon cycling process such as ecosystem respiration. In 2010 we started a long鄄term factorial experiment in an alpine meadow in Damxung County in northern Tibet, China, to examine the interactive effects of
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