Reproductive Ecology of Male and Female Strobili and Mating System in Two Different Populations of Pinus roxburghii

Table 3

Production potential of reproductive organs in P. roxburghii.

Observed variables	Lower altitude (900 m asl)				Higher altitude (1900 m asl)
	1998	1999	2000	2001	1998	1999	2000	2001
Pollen cone production per tree (×10^3)	28.3±1.56	42.44±8.32	22.6±1.72	33.60±6.78	21.9±0.34	28.1±0.89	20.3±1.22	24.48±1.78
Ovulate cone production per tree	101.0±2.13	210.4±3.54	27.0±3.49	47.6±5.52	57.4±0.87	143±3.76	17.2±2.92	33.9±4.7
Pollen grains production per cone (×10^6)	71.9±4.08	77.22±9.76	68.58±3.62	72.12±8.2	66.8±2.9	68.1±3.25	66.3±2.19	67.2±3.58
Pollen grains production per tree (×10^11)	22.1±1.37	27.66±3.15	22.04±1.41	23.6±3.29	15.4±1.23	18.3±0.76	13.9±1.48	16.2±1.25
Ovulate cone production per 100 male cone	0.36±0.01	0.65±0.003	0.158±0.015	0.216±0.02	0.26±0	0.57±0.01	0.14±0.01	0.18±0.02
Pollen-ovule ratio/individual	25.1±1.59	13.16±3.98	85.48±0.89	53.4±4.95	26.1±0.99	12±2.08	74.6±2.2	53.5±2.52