湖北省植被覆盖指数时空分布特征研究

Study on the spatial-temporal pattern of vegetation coverage degree of Hubei Province

以中国资源环境数据库为支撑,计算出1995和2000年湖北省各市县植被覆盖指数及省级归一化系数。结果表明:1995到2000年湖北省级植被覆盖指数归一化系数从269.70增加到269.85,即植被覆盖率呈下降趋势;五年间湖北省植被覆盖指数平均降低了0.1。湖北省植被覆盖程度的空间分异主要受自然地理格局的控制,但是这种控制程度在逐步减弱;不同县域植被覆盖变化规律受制于人类活动尤其是土地利用政策的影响。

Based on Chinese Resources and Environment Database,the vegetation coverage index for each county and its provincial normalized coefficient of 1995 and 2000 of Hubei province are calculated.Calculation indicates that the provincial normalized coefficient increased 0.15 from 269.70 of 1995 to 269.85 of 2000,showing vegetation coverage degradation.The average of vegetation coverage index decreased 0.1 during five years.Maps of the vegetation coverage index show that the vegetation coverage spatial difference mainly controlled by the natural geographical pattern of Hubei province,though the controlling degree decreased step by step and different counties showed different change directions,which mainly affected by human activity,especially land use policy.