【摘要】 【目的】河南省南阳市是南水北调中线工程渠首所在地和核心水源区，是全国石漠化较严重的区域之一，探索该区植被净初级生产力（net primary productivity, NPP）的时空演变趋势及驱动因素，对该区水源地保护及生态安全保障有重要意义。【方法】基于MOD17A3数据集，结合气象数据、土地利用数据和河南省第四次全国岩溶地区石漠化调查数据，利用Theil-Sen Median趋势分析、相关性分析和土地利用变化贡献率等分析方法，研究2000—2020年河南省南阳市及其石漠化区域的NPP时空变化特征，探究其对气候变化和土地利用变化的响应。【结果】1)2000—2020年，南阳市90%以上的区域NPP显著增长；2）南阳市NPP变化的主要气候因子驱动类型为气温驱动，占全市面积的23.61%，非气候因子驱动区占全市面积的69.65%;3）长时间土地利用持续有利于NPP增长，土地利用类型间转换越剧烈，其对NPP的影响越大；4)2000—2020年，石漠化区域年均NPP高于非石漠化区域，气温驱动区占区域面积的51.45%。【结论】2000—2020年，南阳市NPP呈增长趋势，气温驱动为主要驱动类型，土地利用持续有利于NPP增长，土地利用变化越大则对NPP变化影响越大，这可为南阳市土地的合理利用和石漠化生态治理提供科学依据。更多还原

【Abstract】 【 Objective】 Nanyang, Henan Province is the head of the South-North Water Diversion Project and the core water source area, and is one of the more serious areas of rocky desertification in the country. Exploring the spatial and temporal evolution trends and drivers of vegetation net primary productivity(NPP) in the region is important for water source protection and ecological safety assurance.【 Method】 Based on MOD17A3 dataset, combined with meteorological data, land use data and the fourth national rocky desertification survey data, the spatial and temporal characteristics of NPP in Nanyang, Henan Province and the rocky desertification areas from 2000 to 2020 were investigated by the Theil-Sen Median trend analysis, correlation analysis and land use change contribution ratio, to explore its response to climate change and land use change.【Result】1) From 2000 to 2020, over 90%of the regional NPP significantly increased in Nanyang; 2) The main driving type of NPP changing in Nanyang is temperature driven, accounting for 23.61% of the city’s area, non-climate factor driven areas account for 69.65% of the city’s area; 3) Long term continuous land use is beneficial for NPP growth, and the more intense the conversions between land use types, the greater the impact on NPP; 4) From 2000 to 2020, the annual average NPP is higher in rocky desertification areas than in non-rocky desertification areas, the temperature driven zone accounts for 51.45% of the rocky desertification area.【Conclusion】From 2000 to 2020, the NPP showed an increasing trend in Nanyang, with temperature driven as the main driving type. The sustained land use was beneficial for NPP growth, and the more frequent the land use change, the more significant impact on NPP change, which can provide scientific basis for the rational land use and the ecological management of rocky desertification in Nanyang.更多还原