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Factors Controlling Soil Carbon Levels in New Zealand Grasslands

Is Clay Content Important?

Landcare Research, Private Bag 11052, Palmerston North, New Zealand

View larger version (31K): [in a new window]   Fig. 1 Relationships between various soil properties and soil organic C (t ha-1): (a) clay – all pedons; (b) Siox – all pedons; (c) Siox – Allophanic soil; (d) Alpy – all pedons; (e) Alpy – Allophanic soils; (f) Alpy – Brown soils; (g) Alpy – Gley soils; (h) Alpy – Pallic soils; (i) Alpy – Recent soils. R2 values and levels of significance are given in Table 4

View larger version (30K): [in a new window]   Fig. 2 Relationships between various soil properties and soil organic C (g kg-1): (a) clay – all pedons; (b) Siox – all pedons; (c) Siox – Allophanic soils; (d) Alpy – all pedons; (e) Alpy – Allophanic soils; (f) Alpy – Brown soils; (g) Alpy – Gley soils; (h) Alpy – Pallic soils; (i) Alpy – Recent soils. R2 values and levels of significance are given in Table 5