Changes in the Tree-Ring Width-Derived Cumulative Normalized Difference Vegetation Index over Northeast China during 1825 to 2013 CE

Vegetation coverage is very important in terrestrial ecosystems and climate systems. However, the observational record of normalized difference vegetation index (NDVI), which started 1980s when satellites became widely used, too short to investigate history variation beyond modern observation period. Here, we present a 189 y series based on total 349 Mongolian pine (Pinus sylvestris var. mongolica Litv) cores from seven locations central–western Da Hinggan Mountains (CW–DHM), northeastern China. We found significant relationship between tree-ring width regional cumulative (CNDVI). The correlation ring-width chronology June–July CNDVI (CNDVIJJ) was significant, with r = 0.68 (n 32, p < 0.001) an explained variance 45.8% (44.0% after adjustment for loss degree freedom). On this basis, designed transfer function reconstruct CNDVIJJ CW–DHM region 1825 2013 CE (Common Era). During last years, there were 28 years high values, another low values. also observed fluctuations at inter-annual decadal time scales, including eight value periods nine periods. Based our analysis, associated climatic factors, such as temperature, precipitation Palmer Drought Severity Index (PDSI), combines both temperature precipitation. From 1950 2002 CE, showed noticeable decreasing trend region, whereas 2003 exhibited apparent increase, has been southern Central Siberia, eastern Mongolia China, indicating that change related local some parts Asia.