Table 1. Coverage and population structure of A. ordosica in the four patches.

	Coverage	Individuals in the 900-m2 plots
		Total	Saplings (proportion)	Adults (proportion)
	11.2%	865	515 (59.5%)	350 (40.5%)
Patch edges	13.8%	594	244 (41.1%)	350 (58.9%)
	15.1%	839	493 (58.8%)	346 (41.2%)
	15.3%	426	116 (27.2%)	310 (72.8%)
	47.3%	900	23 (2.6%)	877 (97.4%)
Patch centers	40.2%	745	36 (4.8%)	709 (95.2%)
	41.9%	859	22 (2.6%)	837 (97.4%)
	39.4%	925	44 (4.8%)	881 (95.2%)
Probability for equality	<0.001*		0.012*	0.012*

Note: *indicates a significance level of p<0.05 (by T-test).