The grassland in Inner Mongolia, one of the largest remaining grassland ecosystems in the world, is extensive and covers an area of up to 68% of the entire region. Recently, with the increasing needs of livestock products, the ecological function of the grassland is severely degraded by overgrazing. The effect of grazing has become an urgent and crucial issue in the study of grassland ecology. The early researches mainly focused on the effects of grazing on the productivity, community structure and biodiversity of the grasslands through the browsing, trampling around and excretion of livestock. Focusing on C4 soil or plants, only a few studies have considered the effects of grazing on the stoichiometry traits of soil and plants. The mechanism by which grazing affects the stoichiometry traits of soil and plants is far from clear. For this issue, we carried out a study considering the role of grazing on the stoichiometry traits of soil and plant at both population and community scales.
In large scale, plant stoichiometry is mainly affected by latitude and longitude. Many works has have been done to study the effects of temperature on plant stoichiometry along the latitude gradient, while researches on the precipitation along the longitude gradient are rare. In this research, we studied the stoichiometry characteristics of grassland communities along the longitude gradient in Hulunbeir. The results showed as follow: 1) the range of leaf carbon was 440. 76-452. 72 mg / g, leaf nitrogen was 17. 79-30. 88 mg / g,and leaf phosphorous was 1. 31-1. 71 mg / g. Both the leaf carbon and C / N
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