Spatiotemporal Characteristics of Grassland Net Primary Productivity and Precipitation Use Efficiency in Qinghai Plateau [青海高原草地净初级生产力和降水利用效率时空特征]

作者：Huang X.-T.; Yao B.-Q.; Ma Z.; Zhou H.-K.^*

来源：草地学报, 2019, 29: 19-26.

DOI：10.11733/j.issn.1007-0435.2021.Z1.003

• Grassland
• NPP
• PUE
• Qinghai Plateau
• Spatiotemporal characteristics

To explore the spatial and temporal characteristics of grassland net primary productivity (NPP) and precipitation use efficiency (PUE) in Qinghai, the spatial and temporal characteristics of NPP and PUE in Qinghai grassland from 2001 to 2017 were analyzed through spatial statistics of geographic information system based on the remote sensing NPP data and precipitation spatial interpolation data released by the national Qinghai-Tibet Plateau scientific data center. The results showed that: From 2001 to 2017, the av erage NPP of Qinghai grassland was 42. 81 gC ? m-2. The high values were mainly distributed in the east and south of Qinghai Plateau, and the low values were mainly distributed in the northwest of Qinghai Plat-eau. From 2001 to 2017, the annual variation of grassland NPP in Qinghai Plateau was relatively stable, with an average annual rate of 0. 09 gC ? m-2. The average PUE of Qinghai grassland from 2001 to 2017 was 0. 089 gC ? m-2 ? mm-1. The high values were mainly distributed in the east and south of Qinghai Plateau, and the low values were mainly distributed in the west and northwest of Qinghai Plateau. From 2001 to 2017, the annual change of PUE in Qinghai grassland showed a weak fluctuating downward trend, with an average annual decline rate of 0. 0023 gC ? m-2 ? mm-1. From 2001 to 2017, the interannual varia-tion of PUE in Qinghai grassland was negatively correlated with the interannual variation of precipitation. This study provides an important theoretical reference and data support for sustainable utilization of grass-land in Qinghai Plateau.

• 单位
  中国科学院大学