Impact of land use/land cover types on surface humidity in northern China in the early 21st century

In the context of global change, it is essential to promote rational development and utilization land resources, improve quality regional ecological environment, harmonious human nature for sustainability. We identified use/land cover types in northern China from 2001 2018 with ENVI images ArcGIS software. Meteorological data were selected 292 stations China, potential evapotranspiration was calculated Penman—Monteith formula, reanalysis humidity observed obtained. The minus observation (RMO, i.e., difference between humidity) can effectively characterize impact different (forestland, grassland, cultivated land, construction water body unused land) on surface early 21st century. results showed that 2018, area forestland expanded (increasing by approximately 1.80×104 km2), while reduced (decreasing 5.15×104 environment improved. Consequently, most areas tended be wetter. contributions changes related environment. six highest northeastern region a better lowest northwestern region, fragile Surface closely variation vegetation coverage; when coverage positive (negative) (reduced), became greatest. Unused associated serious negative humidity. Affected distribution pattern vegetation, seasons decreased east west China. seasonal growth vegetation: summer, followed autumn spring, winter. According results, expected increase decrease likely region.