Study on the caloric value of typical steppe community in Inner Mongolia
The caloric values of tWO typical steppe communities(Leymus chinensis and Stipa grandis The caloric values of two typical steppe communities (Leymus chinensis and Stipa grandis) in Inner Mongolia were measured and analyzed on the scale of community in July and August 2006, meanwhile, the plant composition and biomass of community were investigated. The caloric value of L. chinensis was 19.03 kJ/g (CV= 1. 61%); and the value of S. grandis was 19. 13 kJ/g (CV = 1. 33%). The analysis of variance showed that the caloric values of two species were not significantly different whether they were from same plot or not, and same season or not. The values value showed an increasing trend in observing period along with the season, and might be described with 2-order polynomial model for L. chinensis,and better with linear model for S. grandis. At the community level, S. grandis had the higher caloric values that were 19. 03 kJ/g and 19. 28 kJ/g respectively in two communities. The species with the low value were Axyris amaranthoides and Chenopodium glau-cum in L. chinensis community (15. 04 kJ/g), and Salsola collina in S. grandis community (12. 75 kJ/g). The caloric value of L. chinensis community (18. 73 kJ/g) was higher than that of S. grandis community (18. 43 kJ/g). The caloric value of aboveground biomass was higher than underground biomass and the species from gramineae family was higher than those from other families. The caloric value slightly varied with the growing season and community structure.
国家科技期刊平台
NSTL
万方数据
维普
