After the Japanese occupied the Korea, the neighbor of China, many Korean farmers were forced to immigrate into the Northeastern China in succession for escaping from the enslavement of the Japanese colonialism domination.
The Chinese government and people generally thought that the Koreans in the Northeastern China were the Japanese pioneers of invading Northeastern China, therefore the warlords of the Northeastern China restricted and excluded the Korean Minority, creating so many incidents to persecute the Korean Minority in the late 1920' s that the relations between the Korean Minority and Han nationality strained and deteriorated day by day.
Japanese imperialism in China's northeast region for the 14 years of colonial rule, through coercive means to education in the colonial education track and ruin the normal development of the North-East culture.
In modern time,Japanese government adopted all means to grab privileges in China's Northeast("Manchuria" and Inner Mongolia) ,and gradually got the "special interests".
The method of trend surface analysis was used to analyze the distribution of landscape elements along environmental gradients in Jingouling forest farm, northeast China's Jilin Province.
This study was conducted at Maoershan Forest Research Station (45°21'-45°25'N, 127°30'-127°34'E) owned by Northeast Forestry University in Harbin, northeast China.
The lithosphere of northeastern China is composed of the Erguna, Xingan, Songnen, Jiamusi blocks and Mesozoic Wandashan accretionary complex from west to east.
The studied floral assemblage is compared with several floras of East Asia: the Mongugai flora of Primor'e, the Tianqiaoling flora of northeastern China, the Yamanoi and Nariwa floras of Japan.