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Factors Controlling Soil Carbon Levels in New Zealand Grasslands

Is Clay Content Important?

Harry J. Percival, Roger L. Parfitt and Neal A. Scott

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



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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

 


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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

 





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