年份Year | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 |
减少土壤废弃 Land erosion reduction | 3.71 | 3.76 | 3.76 | 3.77 | 3.78 | 3.81 | 3.88 |
保持土壤养分 Nutrient conservation | 8.58 | 8.68 | 8.69 | 8.71 | 8.74 | 8.79 | 8.96 |
总价值Total | 12.29 | 12.44 | 12.45 | 12.48 | 12.52 | 12.60 | 12.84 |