S1 File - Spatio-temporal patterns of carbon, nitrogen and phosphorus in the aboveground parts of plants in alpine grasslands on the Qinghai-Xizang Plateau: Insights from a multi-faceted analysis

S1 Fig. Observed carbon content of plant aboveground parts under the sole effect of climate change or the combined effects of climate change and human activities. S2 Fig. The spatial distribution of (a) carbon content, (b) nitrogen content, (c) phosphorus content, (d) carbon pool, (e) nitrogen pool, (f) phosphorus pool, (g) ratio of carbon to nitrogen (C:N), (h) ratio of carbon to phosphorus (C:P), and (i) ratio of nitrogen to phosphorus (N:P). C: solely affected by climate change. S3 Fig. The spatial distribution of (a) carbon content, (b) nitrogen content, (c) phosphorus content, (d) carbon pool, (e) nitrogen pool, (f) phosphorus pool, (g) ratio of carbon to nitrogen (C:N), (h) ratio of carbon to phosphorus (C:P), and (i) ratio of nitrogen to phosphorus (N:P). H: solely affected by human activities. S4 Fig. The temporal stability of (a) carbon content, (b) nitrogen content, (c) phosphorus content, (d) carbon pool, (e) nitrogen pool, (f) phosphorus pool, (g) ratio of carbon to nitrogen (C:N), (h) ratio of carbon to phosphorus (C:P), and (i) ratio of nitrogen to phosphorus (N:P). C: solely affected by climate change. S5 Fig. The temporal stability of (a) carbon content, (b) nitrogen content, (c) phosphorus content, (d) carbon pool, (e) nitrogen pool, (f) phosphorus pool, (g) ratio of carbon to nitrogen (C:N), (h) ratio of carbon to phosphorus (C:P), and (i) ratio of nitrogen to phosphorus (N:P). H: solely affected by human activities. S6 Fig. The relative change of (a) carbon content, (b) nitrogen content, (c) phosphorus content, (d) carbon pool, (e) nitrogen pool, (f) phosphorus pool, (g) ratio of carbon to nitrogen (C:N), (h) ratio of carbo n to phosphorus (C:P), and (i) ratio of nitrogen to phosphorus (N:P). C: solely affected by climate change. S7 Fig. The relative change of (a) carbon content, (b) nitrogen content, (c) phosphorus content, (d) carbon pool, (e) nitrogen pool, (f) phosphorus pool, (g) ratio of carbon to nitrogen (C:N), (h) ratio of carbon to phosphorus (C:P), and (i) ratio of nitrogen to phosphorus (N:P). H: solely affected by human activities. S8 Fig. Relationships between (a) the change rate of carbon content and carbon content, (b) the change rate of nitrogen content and nitrogen content, (c) the change rate of phosphorus content and phosphorus content, (d) the change rate of carbon pool and carbon pool, (e) the change rate of nitrogen pool and nitrogen pool, (f) the change rate of phosphorous pool and phosphorus pool, (g) the change rate of the ratio of carbon to nitrogen (C:N) and the C:N, (h) the change rate of the ratio of carbon to phosphorus (C:P) and the C:P, and (i) the change rate of the ratio of nitrogen to phosphorus (N:P) and the N:P. C: solely affected by climate change. S9 Fig. Relationships between (a) the change rate of carbon content and carbon content, (b) the change rate of nitrogen content and nitrogen content, (c) the change rate of phosphorus content and phosphorus content, (d) the change rate of carbon pool and carbon pool, (e) the change rate of nitrogen pool and nitrogen pool, (f) the change rate of phosphorous pool and phosphorus pool, (g) the change rate of the ratio of carbon to nitrogen (C:N) and the C:N, (h) the change rate of the ratio of carbon to phosphorus (C:P) and the C:P, and (i) the change rate of the ratio of nitrogen to phosphorus (N:P) and the N:P. H: solely affected by human activities. S10 Fig. Relationships between (a) the change rate of carbon content and carbon content, (b) the change rate of nitrogen content and nitrogen content, (c) the change rate of phosphorus content and phosphorus content, (d) the change rate of carbon pool and carbon pool, (e) the change rate of nitrogen pool and nitrogen pool, (f) the change rate of phosphorous pool and phosphorus pool, (g) the change rate of the ratio of carbon to nitrogen (C:N) and the C:N, (h) the change rate of the ratio of carbon to phosphorus (C:P) and the C:P, and (i) the change rate of the ratio of nitrogen to phosphorus (N:P) and the N:P. C + H: simultaneously affected by climate change and human activities. S11 Fig. Relationships between (a) the relative change of carbon content and the temporal stability of carbon content, (b) the relative change of nitrogen content and the temporal stability of nitrogen content, (c) the relative change of phosphorus content and the temporal stability of phosphorus content, (d) the relative change of carbon pool and the temporal stability of carbon pool, (e) the relative change of nitrogen pool and the temporal stability of nitrogen pool, (f) the relative change of phosphorous pool and the temporal stability of phosphorus pool, (g) the relative change of the ratio of carbon to nitrogen (C:N) and the temporal stability of the C:N, (h) the relative change of the ratio of carbon to phosphorus (C:P) and the temporal stability of the C:P, and (i) the relative change of the ratio of nitrogen to phosphorus (N:P) and the temporal stability of the N:P. C + H: simultaneously affected by climate change and human activities. S12 Fig. Relationships between (a) the relative change of carbon content and the temporal stability of carbon content, (b) the relative change of nitrogen content and the temporal stability of nitrogen content, (c) the relative change of phosphorus content and the temporal stability of phosphorus content, (d) the relative change of carbon pool and the temporal stability of carbon pool, (e) the relative change of nitrogen pool and the temporal stability of nitrogen pool, (f) the relative change of phosphorous pool and the temporal stability of phosphorus pool, (g) the relative change of the ratio of carbon to nitrogen (C:N) and the temporal stability of the C:N, (h) the relative change of the ratio of carbon to phosphorus (C:P) and the temporal stability of the C:P, and (i) the relative change of the ratio of nitrogen to phosphorus (N:P) and the temporal stability of the N:P. C: solely affected by climate change. S13 Fig. Relationships between (a) the relative change of carbon content and the temporal stability of carbon content, (b) the relative change of nitrogen content and the temporal stability of nitrogen content, (c) the relative change of phosphorus content and the temporal stability of phosphorus content, (d) the relative change of carbon pool and the temporal stability of carbon pool, (e) the relative change of nitrogen pool and the temporal stability of nitrogen pool, (f) the relative change of phosphorous pool and the temporal stability of phosphorus pool, (g) the relative change of the ratio of carbon to nitrogen (C:N) and the temporal stability of the C:N, (h) the relative change of the ratio of carbon to phosphorus (C:P) and the temporal stability of the C:P, and (i) the relative change of the ratio of nitrogen to phosphorus (N:P) and the temporal stability of the N:P. H: solely affected by human activities. S14 Fig. The relative contribution of geographic position, climate conditions (mean annual air temperature, precipitation and radiation), soil nutrient conditions (mean soil organic carbon, total nitrogen, total phosphorus, ammonium nitrogen, nitrate nitrogen, available phosphorus, ratio of soil organic carbon to total nitrogen, ratio of soil organic carbon to total phosphorus, and ratio of total nitrogen to total phosphorus) and mean soil pH to the mean (a) carbon content, (b) nitrogen content, (c) phosphorus content, (d) carbon pool, (e) nitrogen pool, (f) phosphorus pool, (g) ratio of carbon to nitrogen (C:N), (h) ratio of carbon to phosphorus (C:P), and (i) ratio of nitrogen to phosphorus (N:P) under the single effect of climate change. S15 Fig. The relative contribution of geographic position, climate conditions (mean annual air temperature, precipitation and radiation), soil conditions (mean soil organic carbon, total nitrogen, total phosphorus, ammonium nitrogen, nitrate nitrogen, available phosphorus, pH, ratio of soil organic carbon to total nitrogen, ratio of soil organic carbon to total phosphorus, and ratio of total nitrogen to total phosphorus) and mean annual maximum normalized difference vegetation index (NDVImax) to the mean (a) carbon content, (b) nitrogen content, (c) phosphorus content, (d) carbon pool, (e) nitrogen pool, (f) phosphorus pool, (g) ratio of carbon to nitrogen (C:N), (h) ratio of carbon to phosphorus (C:P), and (i) ratio of nitrogen to phosphorus (N:P) under the single effect of human activities. S16 Fig. The relative contribution of geographic position, climate stability (the temporal stability of annual air temperature, precipitation and radiation), soil nutrient. en to total phosphorus) and the temporal stability of soil pH to the temporal stability of (a) carbon content, (b) nitrogen content, (c) phosphorus content, (d) carbon pool, (e) nitrogen pool, (f) phosphorus pool, (g) ratio of carbon to nitrogen (C:N), (h) ratio of carbon to phosphorus (C:P), and (i) ratio of nitrogen to phosphorus (N:P) under the single effect of climate change. S17 Fig. The relative contribution of geographic position, climate stability (the temporal stability of annual air temperature, precipitation and radiation), soil stability (the temporal stability of soil organic carbon, total nitrogen, total phosphorus, ammonium nitrogen, nitrate nitrogen, available phosphorus, pH, ratio of soil organic carbon to total nitrogen, ratio of soil organic carbon to total phosphorus, and ratio of total nitrogen to total phosphorus) and the temporal stability of maximum normalized difference vegetation index (NDVImax) to the temporal stability of (a) carbon content, (b) nitrogen content, (c) phosphorus content, (d) carbon pool, (e) nitrogen pool, (f) phosphorus pool, (g) ratio of carbon to nitrogen (C:N), (h) ratio of carbon to phosphorus (C:P), and (i) ratio of nitrogen to phosphorus (N:P) under the single effect of human activities. S18 Fig. The relative contribution of geographic position, climate change (the change rate of annual air temperature, precipitation and radiation), soil nutrient change (the relative change of soil organic carbon, total nitrogen, total phosphorus, ammonium nitrogen, nitrate nitrogen, available phosphorus, ratio of soil organic carbon to total nitrogen, ratio of soil organic carbon to total phosphorus, and ratio of total nitrogen to total phosphorus) and the relative change of soil pH to the relative change of (a) carbon content, (b) nitrogen content, (c) phosphorus content, (d) carbon pool, (e) nitrogen pool, (f) phosphorus pool, (g) ratio of carbon to nitrogen (C:N), (h) ratio of carbon to phosphorus (C:P), and (i) ratio of nitrogen to phosphorus (N:P) under the single effect of climate change. S19 Fig. The relative contribution of geographic position, climate change (the change rate of annual air temperature, precipitation and radiation), soil change (the relative change of soil organic carbon, total nitrogen, total phosphorus, ammonium nitrogen, nitrate nitrogen, available phosphorus, pH, ratio of soil organic carbon to total nitrogen, ratio of soil organic carbon to total phosphorus, and ratio of total nitrogen to total phosphorus) and the change rate of maximum normalized difference vegetation index (NDVImax) to the relative change of (a) carbon content, (b) nitrogen content, (c) phosphorus content, (d) carbon pool, (e) nitrogen pool, (f) phosphorus pool, (g) ratio of carbon to nitrogen (C:N), (h) ratio of carbon to phosphorus (C:P), and (i) ratio of nitrogen to phosphorus (N:P) under the single effect of human activities.
(RAR)