Total soil nitrogen (kg/ha): Rainforest, Puerto Rico 900, Amazon Venezuela 1,100, Oxisol forest Venezuela 2,000, Forest, ivory coast 6,400, Forest, Malaysia 8,500, Rainforest, costa Rica 18,000. Turnover time of leaves (in years): Rainforest, Puerto Rico 2.2, Amazon Venezuela 0, Oxisol forest Venezuela 1.8, Forest, ivory coast 1.6, Forest, Malaysia 1.3, Rainforest, costa Rica 1.1. Q7. Speculate as to why trees, in poorer soils produce leaves that las longer than in richer soils. This is interpretation of data