During this period, the vegetation coverage and VI of TRHR grassland showed an upward trend, and the bald spot rate and NPP showed a decreasing trend.
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Dynamic Response and Adaptation of Grassland Ecosystems in the Three-River Headwaters Region under Changing Environment: A Review.
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The sentences
Most of the studies mentioned above showed an increasing trend in NDVI, especially since the 21st century, but differences were observed in the results.