The sown vegetation characteristics of mixed grassland with 4-year old artificial controlling were studied in the source region of Three Rivers. The results showed that the coverage and biomass of mixed communities under artificial control measures were all higher than those in CK (Natural succession of grassland), especially the sown community biomass was significantly higher than CK,grassland primary productivity was improved. The growth rate dynamics of the communities showed reversed "V" patterns, with artificial controlling average growth rate of the communities varied from 0.65-0.70 cm/d in growing season, CK average growth rate varied from 0.55-0.65 cm/d. Artificial controlling height of the grass layer was higher than the CK communities, each layer's biomass distributed uniform relatively, community structure showed a pyramid shape, its stability was better than the natural succession of grassland. Therefore, it is extremely important to prevent the cultivated grassland degradation, and improve efficiency through strengthening the grassland management such as fertilizing, preventing and weeding weeds in alpine region.%对三江源区人工调控的4龄混播草地人工植被特征进行研究.结果表明,人工调控的混播群落盖度和植物量均高于对照(自然演替草地),尤其是人工群落植物量显著高于对照,提高了草地初级生产力.全生长季内混播草群的生长速度呈倒"Ⅴ"字型分布,人工调控混播草群的平均生长速度为0.65～0.70 cm/d,对照为0.55～0.65 cm/d;人工调控的草层群落高度比对照高,各层的植物量分配相对均匀,群落垂直结构均呈"金字塔"形,其稳定性优于对照的自然演替草地.所以加强高寒地区人工草地建成后期管理如毒杂草防除和施肥等,对防止人工草地退化,提高利用效率极为重要.
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