【摘要】 荒漠草原是荒漠与草原间的过渡带，生态系统非常脆弱，一旦被破坏，难以恢复。四子王旗荒漠草原作为内蒙古温带草原中最干旱的一个类型，其生态系统景观格局演变不仅关系到自身草原生态系统多样性，而且对邻近草原的生态功能恢复具有重要意义。本研究利用卫星遥感技术结合景观生态学理论和InVEST模型，评估了2003—2017年四子王旗生态系统景观格局和生境质量演变，并进一步选取草地生产力NPP作为关键生态系统参数，分析了四子王旗草原生态系统对气候因子的响应。结果表明：2003—2017年，四子王旗生态系统景观格局破碎化程度提升，优势斑块景观连接性进一步减弱，总体生境质量下降了约2%,表现出明显的区域差异；四子王旗NPP总体趋势是逐年降低，并呈现北少南多的空间分布特征；相较于气温，四子王旗草地NPP与累积降水的相关性更大，并且存在明显的滞后效应，滞后时间2.96个月。更多还原

【Abstract】 Desert steppe is an ecotone between desert and steppe. Desert steppe is very fragile. Furthermore, it is difficult to restore once destroyed. Desert steppe in Siziwang Banner is one of the most arid types in the temperate steppe of Inner Mongolia. The evolution of landscape pattern in desert steppe is not only related to the diversity of grassland ecosystem, but also has important significance for the restoration of ecological functions of neighboring ecosystems. In this study, we assessed the change of landscape pattern and habitat quality in Siziwang Banner desert steppe based on remote sensing technology, landscape ecology theory, and InVEST model. We analyzed its responses to climate factors based on the key parameter NPP to enhance our understanding of desert steppe. From 2003 to 2017, the fragmentation degree of ecosystem landscape pattern in Siziwang Banner was increased, the connectivity of dominant patch landscape was further weakened, and the overall habitat quality was decreased by about 2%, showing obvious regional differences. The NPP of Siziwang Banner decreased year by year, with a spatial distribution pattern of decreasing in the north and increasing in the south. NPP in Siziwang Banner grassland was more correlated with cumulative precipitation than with air temperature. There was an obvious legacy effect, with a lag time of 2.96 months.更多还原