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Table 2 and Figure 3 indicate the trends in freeze depth on the TRSR during 1960-2014.
Table 3 and Figure 4 show the trends observed in the freeze first date, freeze last date, and freeze duration on the TRSR during the study period.
These decreasing trends also indicate that, in areas of seasonally frozen soil, the soil remains frozen for fewer days each year, and an accelerated decreasing trend of freeze duration had appeared in the TRSR during the 1985-2014 and 2000-2014 periods, compared with the 1960-2014 period.
These two trends were all larger than the 0.46[degrees]C [decade.sup.-1] recorded from 1980 to 2014 in this region , implying that a significant accelerated warming trend had appeared over the TRSR since 1985.
The relationships between the forcing variables with freeze depth, first date, last date, and duration for the three different time periods on the TRSR are provided in Table 5.
From the data, the maximum snow depth was very shallow on the TRSR compared with that in Russia and North America.
The TRSR (Figure 1), covering 0.36 million [km.sup.2], is located in the northeast of the Tibetan Plateau.
And then we applied 1 km NDVI data products to calculate and analyze annual average maximum vegetation coverage in the periods before (1990-2004) and after (2004-2012) the implementation of ecological conservation program in TRSR, to show the vegetation growing recovery and/or deterioration.
The remote sensing classification system of grassland degradation in TRSR, according to the principles and characteristics of remote sensing image interpretation, and based on a Chinese national standard "the grading index of natural grassland degradation, desertification, salt marshes (GB19377-20031)," was applied to interpret the trends of grassland degradation by remote sensing.
The TRSR has few national and local stations with weather records spanning 1960s to present.
In the periods of 1975-2012, the average annual temperature of meteorological stations in the TRSR was -0.34[degrees]C; the average annual temperature change rate was approximately 0.48[degrees]C/10a (Figure 2).
During 1975-2012, the average annual precipitation of meteorological stations in the TRSR was 481.83 mm, and variation trend was 9.9 mm/10a (Figure 2).
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