Study on the diet composition and trophic niche of main herbivores in the Inner Mongolia Typical steppe——Taking Leymus chinensis community as an example

Abstract

Abstract: In order to discuss the relations of grassland degradation and the diet composition and trophic niche of main herbivores (Ovis aries, Spermophilus dauricus, Oedaleus asiaticus) in the Inner Mongolia steppe, we research change of diet composition and trophic niche of main herbivores in the different grazing intensity in June-July 2003 by using n-alkane technique. The results showed that the richness of Leymus chinensis and Stipa krylovii decreased significantly with the increase of grazing intensity, while the proportion of Potentilla acaulis in the community increased at the same time. The proportion of Carex korshinskii ingested by O. aries increased significantly with the increase of grazing intensity, and Achnatherum sibiricum and Agropyron michnoi were not ingested by O. aries instead of P. acaulis. The proportion of L. chinensis ingested by S. dauricus inside fence more than outside fence significantly, but A. michnoi, C. korshinskii and P. acaulis were not ingested inside fence. There was no comparison of dietary in O. asiaticus between inside and outside fence due to having no capture it, but the proportion of S. krylovii ingested by O. asiaticus reduced significantly with the increase of grazing intensity, and instead of increasing the proportion of A. michnoi and P. acaulis. The same plant species of ingested were L. chinensis and C. squarrosa. Furthermore, the selected index of L. chinensis was highest. The tropic niche of O. aries was broadened with the increased grazing intensity, on the contrary S. dauricus and O. asiaticus, furthermore, the overlap of trophic niche among three herbivores were similar. In conclusion, an action of heavy grazing in Inner Mongolia steppe changed the L. chinensis community into the P. acaulis community, and this succession lead to the degradation of grassland. While the spoliating grassland resources by O. aries, S. dauricus, O. asiaticus have accelerated the process.

CLC Number:

S812.29

LIU Gui-he, WANG Guo-jie, WANG Shi-ping, ZHANG Ying-jun, WAN Xin-rong, HAO Shu-guang. Study on the diet composition and trophic niche of main herbivores in the Inner Mongolia Typical steppe——Taking Leymus chinensis community as an example[J]. Acta Prataculturae Sinica, 2013, 22(1): 103-111.

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