Table 1. Distribution of study plots by provinces.

Provinces	Seoul, Gyeonggi	Gangwon	Chungbuk	Chungnam	Jeonbuk	Jeonnam	Gyeongbuk	Gyeongnam	Jeju	Total
No. of NFI plots	1,302	2,880	1,049	1,175	982	1,491	3,507	2,190	563	15,139
No. of plots dominated more than 50% by P. densiflora	77	543	193	221	228	328	1,406	665	4	3,665