河北北部低山丘陵区主要草地类型、牧草产量及营养物质动态

FORAGE YIELD AND NUTRIENT DYMAMICS OF THE MAIN GRASSLANDS TYPES IN NORTHERN HEBEI LOW HILL AREAS

本文对河北北部低山丘陵区主要草地类型的牧草产量和牧草营养物质含量动态进行了研究。结果表明生长季内草地牧草产量的积累为单峰型;林缘草甸、草甸草原牧草产量较典型草原和沙地植被的高。草地牧草粗蛋白含量随生长季的延长而降低;粗纤维含量在优势种结实前为上升,结实后下降;林缘草甸中牧草粗蛋白含量最高,粗纤维含量最低;典型草原的牧草粗纤维含量最高,粗蛋白含量最低。

The dymanics of forage yield and nutrient content of four grassland communities was studied. The results showed that each type had one yield peak during the growing season. The forage yield of the grassland communities was higher in the meadow—steppe and meadow on the border of forests than that in the typical steppe and the sand vegetation. The crude protein content of the forage decreased consistently throughout the growing season in various grassland types and crude fiber content increased before fructuation and decreased after fructuration of dominant species. Crude protein content was highest and crude fiber was lowest in the forage of the meadow on the border of forests, reversely in the forage of the typical steppe.