青海省那棱格勒河下游绿洲区生态环境现状评价

摘要

采用归一化植被指数、景观多样性指数、景观均匀度指数等技术指标,评价那棱格勒河下游绿洲的生态环境现状.结果表明:那棱格勒河下游绿洲区主要为中植被覆盖(覆盖度30%~60%)区域,占绿洲区总面积的42.83%;低植被覆盖类型(覆盖度10%~30%)和高植被覆盖类型(覆盖度>60%)次之.极低植被覆盖(覆盖度<10%)区域最少,占绿洲区总面积的3.96%.稀疏草地和荒漠为该区域的优势景观,自然生产力等级低,生态系统受外界干扰后难以恢复,极易发生退化与沙化,系统的恢复稳定性与阻抗稳定性都较弱.%This paper evaluated the ecological status in the lower reaches oasis of Nalenggele River using the technical indicators such as normalized difference vegetation index, landscape diversity index, landscape evenness index et al..The results showed that the oasis in the low reaches of Nalenggele River were mainly middle vegetation cover area (coverage was 30%~60%),accounting for 42.83% of the total oasis area.Followed by low vegetation types (10%~30%) and high vegetation types (>60%).The very low vegetation cover area (<10%) was the least, accounting for 3.96% of the total oasis area.The sparse grass and desert were the superior regional landscape.The ecological environment in the study area was fragile, the natural productivity level was low, the ecosystem was difficult to recover once it was subject to external interfered, and degradation and desertification would take occurrence extremely easily, system restore stability and the impedance stability were both weaker.