Effect of Thinning and Harvest Type on Storage and Losses of Phosphorous in Pinus taeda L. Plantations in Subtropical Argentina

Table 4

Phosphorous export index (EI) and phosphorous stability index of plantations (SIP) for 20-year-old Pinus taeda, for two final cutting harvest scenarios (SO and WT).

Harvest	Treatment	EI	SIP
scenario	(% thinning)		Option 1	Option 2
SO	0	8.64	4.42	1.08
	33	9.38	3.34	0.90
	66	11.7	2.15	0.50
WT	0	7.77	6.08	2.49
	33	8.18	4.84	2.19
	66	9.98	3.38	1.11

Option 1: includes available P in mineral soil; Option 2: includes available P in mineral soil, plus P contained in organic debris from the forest floor, understory, and harvest residues.