Analyse on benefits of grassland rehabilitation from crop field in Jinsha river basin

The experiment of grasses rehabilitation from crop field was conducted in 2002 in Jinsha river basin which was located in Yiliang county of Zhaotong distict Yunnan provine. The sites were 2000m above sea level. 9 species and mixture combinations were used in the trials. The productive capacity such as above-ground-biomass, plant height and growing rate were analyzed in the year of 2003. The results showed that 9 species could survive from winter. These grasses had an advantage in productive characters and can be used as the species of planting grass in the local conditions. Festuca arundinacea F. and Promus inermis leyss B. were better than Lolium Perenne L. and Festuca rabra in the characters of growth and yields. The result showed that the combinations of Trifolium repens L. +Lolium Perenne L. had an advantage in adaptation and the combinations of Trifolium repeens L. +poa pratensis L. had an advantage in the vegetable yield production. The eco-environmental benefits of the cropland conversion was remarkable under the dry and windy conditions because the vegetation of the grassland have the ability of continuable , benign and cyclical hold water, thus to protect fertilizer and reduce the soil erosion.