西藏聂荣县不同退化草地植被群落特征及营养品质分析

Analysis of Community Characteristics and Nutrient Quality of Different Degraded Meadow in Nierong County

探讨了高寒草地植物多样性和营养状况对退化等级的响应,为退化草甸草地修复提供参考。试验以基于西藏那曲市聂荣县不同退化程度的高寒草甸草地为研究对象,分析高寒草甸草地植被群落组成、生产力及其营养品质变化。研究表明,与退化草甸草地相比,围栏封育的未退化草地植物种类最多,地上生物量最高。围栏封育的未退化草地粗蛋白(112.7 g/kg)和中性洗涤纤维(638.32 g/kg)含量较不同程度的退化草地上升显著(P<0.05);高寒草甸草地粗蛋白和中性洗涤纤维含量随着高寒草地退化的加剧而降低。

The research on the vegetation community characteristics and nutritional quality of degraded alpine meadows is very important in Tibet.Based on the alpine meadows with different degrees of degradation in Nierong County,Nagqu City,Tibet,the changes in vegetation community composition,productivity and nutritional quality of alpine meadows were analyzed,and the responses of plant diversity and nutritional status to degradation grades in alpine meadows were explored.The results showed that the non-degraded meadows enclosed by fences had the most plant species,and the above ground biomass was the highest compared with degraded grasslands.There were obvious differences in the nutritional quality of community plants between different plots,and the content of crude protein(112.7g/kg)and neutral detergent fiber(638.32g/kg)in the non-degraded meadow enclosed by the fence was significantly higher than that in the degraded meadow with different degrees(P<0.05),the content of crude protein and neutral detergent fiber decreased with the aggravation of alpine meadow degradation.