Gansu Provincial Key Laboratory of Remote Sensing, Hei'he Remote Sensing Experimental Research Station, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China.
Xining Comprehensive Survey Center of Natural Resources, China Geological Survey, Xining 810000, China.
Int J Environ Res Public Health. 2023 Jan 25;20(3):2179. doi: 10.3390/ijerph20032179.
The Qinghai Lake Basin acts as a natural barrier, preventing the western desert from spreading eastward. This is an important link in preserving the ecological stability of the northeastern region of the Qinghai-Tibet Plateau (QTP). Therefore, quantitative research into the net primary productivity (NPP) of vegetation and its driving force in the Qinghai Lake Basin is required. The effects of land use/cover change (LUCC) and climate change on NPP in the Qinghai Lake Basin were studied using R-contribution ratio and partial correlation analysis methods using MOD17A3H products, Land Use/Land Cover (LULC) data, and meteorological data. (1) The LULC of the Qinghai Lake Basin showed a trend that "the area of grassland, cultivated land, and unused land continued to decrease, while the area of other LULC types increased" from 2000 to 2020, according to the study's findings. Grassland, water bodies, construction land, and unused land dominated the mutual transformation of LULC types. (2) The NPP of the basin showed a growing trend, with a growth rate of 3.93 gC·m·a before 2010 and 0.88 gC·m·a after 2010. Significant regional heterogeneity was found in NPP, with gradients decreasing from southeast to northwest. (3) The impact of LUCC on overall NPP changes had gradually increased. Climate change has been the primary driver of NPP changes in the Qinghai Lake Basin over the last 20 years.
青海湖流域起到了天然屏障的作用，阻止了西部荒漠向东蔓延。这是维护青藏高原东北部生态稳定的重要环节。因此，需要对青海湖流域植被的净初级生产力（NPP）及其驱动力进行定量研究。本研究采用 R 贡献比和偏相关分析方法，利用 MOD17A3H 产品、土地利用/土地覆盖（LULC）数据和气象数据，研究了土地利用/土地覆盖变化（LUCC）和气候变化对青海湖流域 NPP 的影响。（1）研究结果表明，2000 年至 2020 年，青海湖流域的土地利用/土地覆盖呈现出“草地、耕地和未利用地面积持续减少，而其他土地利用/土地覆盖类型面积增加”的趋势，草地、水体、建设用地和未利用地是土地利用/土地覆盖类型相互转化的主要类型。（2）流域 NPP 呈增长趋势，2010 年前的增长率为 3.93 gC·m·a，2010 年后为 0.88 gC·m·a。NPP 存在显著的区域异质性，从东南向西北逐渐降低。（3）LUCC 对整体 NPP 变化的影响逐渐增大。在过去的 20 年里，气候变化一直是青海湖流域 NPP 变化的主要驱动因素。
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