Preliminary studies on calorific value and nutrient composition in tianzhu alpine Polygonum Viviparum meadow
Hu Zi-zhi, Sun Ji-xiong, Zhang Ying-sheng, Xu Chang-lin, Zhang Zi-he
Chin J Plan Ecolo. 1990, 14 (2):
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The calorific values and nutrient compositions of 4 parts of the biomass of the Polygonum viviparum in the meadow from June to September or November were determined. The results obtained are as follows,1. The average calorific value of standing crop was 18330 j/g DM (20279 ash-free matter,AFM) and ranged from 17980 to 18763 j/g DM(19751 to 20830 AFM). It was higher than that of the standing dead+litter,live roots or dead roots, while that of dead roots is higher than that of live roots. There was some seasonal fluctuation of the calorific value, the highest value of standing crop being in the seed ripening period (August 22) of the dominant species Polygonum viviparum, the lowest being in the withering period. The values of standing dead +litter decreased significantly (P<0.05) as time went on, with live roots and dead roots showing opposite trends.2. The average nutrient components of standing crop were crude protein 13.52, crude fat 2.00, crude fiber 22.99, nitrogen-free extract 51.88, crude ash 9.61% and calcium 1.627 and phosphorus 0.164. Compared with the other 3 parts, the characteristics of the standing crop were. higher crude protein and phophorus and lower crude fiber and crude ash. There were clear seasonal changes in the nutrient compositions of the 4 parts of the biomass and each was different from the others.3. Considering the topography, and its floristic composition, production, easiness of grazing, palatability, and caloric and nutritious values, the authors regard the alpine Polygonum viviparum a good grass for grazing.