A study on the dynamic change of gross caloric value and ash content of the several tall grasses

Abstract

Abstract: Monthly changes in the calorific values and ash contents of 8 tall grasses (three C₃ photosynthetic species (Arundo donax, Themeda villosa, Phragmites communis), five C₄ photosynthetic species (Miscanthus floridulus, M. sinensis, M. sacchariflorus, Saccharum arundinaceum, M. lutarioripara) are discussed in this paper to explore the prospects for applying a scientific basis to develop a screening evaluation for energy plants of these tall grasses. 1) The ash contents of the 8 tall grasses differed and varied with season; the annual average ash contents of the three C₃ photosynthesis species were 7.17±1.09% for A. donax, 6.33±0.60% for T. villosa, and 7.89±1.09% for P. communis; while those of the five C₄ photosynthesis species were 4.92±1.38% for M. floridulus, 6.27±0.94% for M. sinensis, 6.99±1.13% for M. sacchariflorus, 5.13±0.88% for S. arundinaceum, and 5.10±0.82% for T. lutarioripara. 2) Among the three C₃ photosynthesis species A. donax had the highest calorific values, while among the five C₄ photosynthesis species the calorific values of M. floridulus, M. sinensis, S. arundinaceum ,M. lutarioripara were closer to each other with no significant difference. M. sacchariflorus had the lowest calorific values. 3) Gross calorific values were correlated with ash contents for A. donax(P＜0.05), they were strongly correlated for M. floridulus and P. communis(P＜0.01), whereas there was no significant correlation between gross calorific values and ash contents for the other species. 4) The average ash free caloric values of the C₃ photosynthetic species were (19.01±0.27) kJ/g for A. donax, (18.58±0.31) kJ/g for T. villosa, (18.72±0.23) kJ/g for P. communis; and those of the C₄ photosynthesis species were (18.52±0.32) kJ/g for M. floridulus, (18.69±0.47) kJ/g for M. sinensis,(18.54±0.33) kJ/g for M. sacchariflorus, (18.48±0.41) kJ/g for S. arundinaceum, (18.49±0.37) kJ/g for M. lutarioripara. The seasonal changes in ash free caloric values were different from those of the gross caloric values due to differing ash contents in the 8 tall grasses.

CLC Number:

Q949.9

NING Zu-lin, CHEN Hui-juan, WANG Zhu-na, ZHANG Zhuo-wen, QIU Ying-jun. A study on the dynamic change of gross caloric value and ash content of the several tall grasses[J]. Acta Prataculturae Sinica, 2010, 19(2): 241-247.

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