碌曲县天然草地围栏封育及补播改良效果分析

Improvement Analysis of Effect of Fens and Resowing on Degraded Rangeland in Luqu County

对围栏封育及补播3年后,披碱草、异针茅、短柄草及嵩草等不同类型草地的主要经济类群及地上生物量进行了研究。结果表明,围栏封育对恢复披碱草、异针茅、短柄草及嵩草等类型草地的植物经济类群发生明显变化,各类型草地的地上生物量显著增加。莎草科、禾本科和豆科牧草的生物量分别较对照提高165.63%、119.33%、56.23%,杂类草的生物量分别下降22.1%、49.33%。

The economic groups and biomass aboveground of Elymus adhuricus, stipa aliena Keng and kobresia were studied after fens and resowing for three years. The results showed that remarkable restoration effect were made after fens were used in degraded grassland in Elymus adhuricus ,stipa aliena keng,kobresia wiUd types. After fens were constructed,the biomass ofaU kinds of benefit grasses were remarkably increased,and the composition of grassland changed greatly.The biornass of Cyperus Linn. ,Leguminosea and Gramineae were increased by 165.63% , 119.33% and 56.23%, respectively. The types and production of forbs were decreased by 22.1% and 49.33% respectively.