From: Stomatal conductance limited the CO2 response of grassland in the last century
Treatment | Plot No. (subplot) | P/K input (g m−2 year−1) | N input (g m−2 year−1) | Functional group composition (%-G/%-F/%-L) | Species richness | pH | Total herbage yield (g m−2) | NNI | PNI | N to P | Nutrient limitation |
---|---|---|---|---|---|---|---|---|---|---|---|
No nitrogen | |||||||||||
CONTROL.L | 2/2(a), 3(a) | 0/0 | 0 | Dicot-rich (48/40/12) | 43 | 7.2 | 224 | 0.4 | 0.6 | 11.3 | Co-limitation |
CONTROL.U | 3(d) | 0/0 | 0 | Dicot-rich (63/33/4) | 41 | 5.2 | 149 | 0.4 | 0.5 | 12.9 | Co-limitation |
PK.L | 7/2(a) | 3.5/22.5 | 0 | Dicot-rich (54/21/25) | 29 | 6.8 | 501 | 0.5 | 1.2 | 4.9 | N-limitation |
Sodium nitrate | |||||||||||
N*1.L | 17(a) | 0/0 | 4.8 | Dicot-rich (62/36/2) | 36 | 7.1 | 244 | 0.4 | 0.4 | 14.9 | Co-limitation |
N*1PK.L | 16(a) | 3.5/22.5 | 4.8 | Dicot-rich (68/20/12) | 26 | 6.7 | 496 | 0.5 | 1.2 | 4.8 | N-limitation |
N*2.PK.L | 14/2(a) | 3.5/22.5 | 9.6 | Grass-rich (80/17/3) | 31 | 6.9 | 487 | 0.5 | 1.2 | 5.2 | Co-limitation |
Ammonium sulfate | |||||||||||
N1.L | 1(b) | 0/0 | 4.8 | Dicot-rich (66/33/1) | 30 | 6.2 | 208 | 0.5 | 0.5 | 15.6 | Co-limitation |
N1.U | 1(d) | 0/0 | 4.8 | Grass-rich (97/3/0) | 6 | 4.1 | 100 | 0.5 | 0.4 | 20.1 | Co-limitation |
N2PK.L | 9/2(b) | 3.5/22.5 | 9.6 | Grass-rich (90/7/3) | 19 | 6.3 | 545 | 0.5 | 1.1 | 5.3 | N-limitation |
N2PK.U | 9/2(d) | 3.5/22.5 | 9.6 | Grass-rich (99/1/0) | 5 | 3.7 | 355 | 0.5 | 0.8 | 7.9 | N-limitation |
N3PK.L | 11/1(b) | 3.5/22.5 | 14.4 | Grass-rich (91/9/0) | 16 | 6.2 | 560 | 0.6 | 1.1 | 6.0 | N-limitation |
N3PK.U | 11/1(d) | 3.5/22.5 | 14.4 | Grass-rich (100/0/0) | 2 | 3.6 | 374 | 0.6 | 0.7 | 9.9 | Co-limitation |