Table 3 Analysis results of RSEI principal component from 2001 to 2020.
From: Analysis of ecological quality changes and influencing factors in Xiangjiang River Basin
Index | NDVI | LST | WET | NDBSI | EV(PC1) | ECR (PC1%) |
---|---|---|---|---|---|---|
2001 | 0.434 | − 0.656 | 0.217 | − 0.576 | 0.03 | 67.3 |
2002 | 0.429 | − 0.554 | 0.255 | − 0.665 | 0.02 | 56.8 |
2003 | 0.423 | − 0.646 | 0.269 | − 0.574 | 0.03 | 76.1 |
2004 | 0.464 | − 0.622 | 0.294 | − 0.557 | 0.03 | 70.7 |
2005 | 0.311 | − 0.645 | 0.371 | − 0.596 | 0.03 | 66 |
2006 | 0.378 | − 0.597 | 0.294 | − 0.643 | 0.03 | 63.7 |
2007 | 0.394 | − 0.512 | 0.308 | − 0.697 | 0.03 | 72.6 |
2008 | 0.391 | − 0.642 | 0.296 | − 0.589 | 0.03 | 63.9 |
2009 | 0.453 | − 0.568 | 0.251 | − 0.639 | 0.03 | 71.3 |
2010 | 0.433 | − 0.566 | 0.262 | − 0.652 | 0.03 | 70.5 |
2011 | 0.464 | − 0.553 | 0.214 | − 0.657 | 0.03 | 73.2 |
2012 | 0.465 | − 0.602 | 0.225 | − 0.607 | 0.03 | 67.9 |
2013 | 0.461 | − 0.618 | 0.219 | − 0.597 | 0.03 | 75.1 |
2014 | 0.501 | − 0.545 | 0.189 | − 0.644 | 0.03 | 66.7 |
2015 | 0.522 | − 0.408 | 0.229 | − 0.712 | 0.03 | 67.1 |
2016 | 0.507 | − 0.532 | 0.207 | − 0.644 | 0.03 | 73.6 |
2017 | 0.477 | − 0.581 | 0.235 | − 0.615 | 0.03 | 74.1 |
2018 | 0.507 | − 0.516 | 0.256 | − 0.641 | 0.03 | 76.5 |
2019 | 0.487 | − 0.502 | 0.261 | − 0.664 | 0.03 | 75 |
2020 | 0.435 | − 0.571 | 0.259 | − 0.645 | 0.03 | 71.2 |