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Assessment of grassland degradation in Guinan county, Qinghai Province, China, in the past 30 years

机译：青海省贵南县近30年草地退化评估

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摘要

In this study, the quantity, quality and spatial changes of grassland in Guinan County, Qinghai Province, China, were assessed by means of interpreting remote sensing satellite imagery during four key periods (1976, 1996, 2001 and 2006) as well as by applying various methods of analysis such as a transition matrix, fractal dimension, dynamic degree modelling and a spatial model of land use change. The assessment results were summarized from three positions. First, grassland area decreased and grassland quality degraded in the past 30 years. The decreased rate of area and the degraded degree of quality were significantly different during different time periods. Both the decline in grassland area and the degradation in grassland quality were determined to be most severe from 1976 to 1996 (especially for high density grassland) and moderate from 1996 to 2001 and from 2001 to 2006. Second, the grassland centre of gravity trended to move along a general southeastern direction; however, the direction of movement of grassland centre of gravity displayed multidirectional and irregular tendencies during different time periods. The primary reason that caused this situation was that the cultivation and protection of grasslands occurred during successive turns. Third, the change observed in grassland behaviour was shaped by a range of factors including natural forces as well as human-induced disturbances. The dominant factor was primarily human activity. The transition matrix method, the fractal dimension method and the spatial model of land use change method showed similar results. Copyright pb 2008 John Wiley & Sons, Ltd.
机译：本研究通过解释四个关键时期（1976年，1996年，2001年和2006年）的遥感卫星图像，并通过应用遥感技术，评估了中国青海省桂南县草地的数量，质量和空间变化。各种分析方法，例如过渡矩阵，分形维，动态度建模和土地利用变化的空间模型。从三个方面总结了评估结果。首先，在过去30年中，草地面积减少，草地质量下降。在不同的时间段内，面积减少率和质量下降程度显着不同。从1976年至1996年（尤其是高密度草原），草地面积的下降和草地质量的下降被确定为最严重的，而1996年至2001年和2001年至2006年则是中等的。第二，草地重心趋势为沿东南方向移动;然而，草地重心的运动方向在不同时期表现出多方向性和不规则的趋势。造成这种情况的主要原因是草地的耕种和保护是在连续的转弯中发生的。第三，草原行为的变化受多种因素影响，包括自然力以及人为干扰。主导因素主要是人类活动。过渡矩阵法，分形维数法和土地利用变化的空间模型法显示了相似的结果。版权所有pb 2008 John Wiley＆Sons，Ltd.

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