Table 1.
Relation of studies and NPP values
| Country | No. of studies | % of global NPP | Rank no. studies | Rank NPP |
|---|---|---|---|---|
| A. Countries with more than 1 study and more than 1% of global NPP | ||||
| United States | 80 | 6.50 | 1 | 3 |
| Brazil | 25 | 12.10 | 2 | 1 |
| China | 13 | 5.60 | 4 | 5 |
| India | 13 | 2.30 | 5 | 10 |
| Canada | 9 | 6.00 | 10 | 4 |
| Indonesia | 9 | 3.20 | 12 | 8 |
| United Republic of Tanzania | 8 | 1.10 | 14 | 19 |
| Australia | 7 | 4.90 | 15 | 6 |
| B. Countries with <5 studies and more than 1% of global NPP | ||||
| Russian Federation | 3 | 11.30 | 27 | 2 |
| Argentina | 3 | 2.40 | 23 | 9 |
| Dem. Rep. of the Congo | 0 | 3.70 | 98 | 7 |
| Colombia | 0 | 1.90 | 89 | 11 |
| Peru | 1 | 1.60 | 51 | 12 |
| Angola | 0 | 1.50 | 65 | 13 |
| Mexico | 1 | 1.50 | 48 | 14 |
| Venezuela | 0 | 1.50 | 209 | 15 |
| Bolivia | 0 | 1.40 | 78 | 16 |
| Sudan | 0 | 1.30 | 192 | 17 |
| Kazakhstan | 0 | 1.20 | 131 | 18 |
| C. Countries with 5 or more studies and <1% of global NPP | ||||
| Italy | 14 | 0.24 | 3 | 63 |
| Sweden | 13 | 0.36 | 6 | 50 |
| United Kingdom | 12 | 0.23 | 7 | 65 |
| Malaysia | 10 | 0.56 | 8 | 32 |
| South Africa | 10 | 0.63 | 9 | 28 |
| Germany | 9 | 0.37 | 11 | 46 |
| Thailand | 9 | 0.51 | 13 | 35 |
| Mozambique | 6 | 0.91 | 16 | 22 |
| Austria | 5 | 0.08 | 17 | 97 |
| Belgium | 5 | 0.04 | 18 | 125 |
| Spain | 5 | 0.37 | 19 | 48 |
| Denmark | 4 | 0.05 | 20 | 119 |
| France | 4 | 0.58 | 21 | 31 |
| the Netherlands | 4 | 0.04 | 22 | 123 |
Net primary production (NPP) values calculated based on Haberl et al., (2011). For this table, we counted studies specialized in one country and studies looking at multiple countries, which are considered otherwise as global or regional studies. ‘Studies’ refers to the articles included in this systematic review.