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A comparison of selecting data points and fitting coefficients methods for estimating self-thinning boundary line A possible boundary line of the hebaceous plant flora in Gansu province The Mossflora of Mt. Jiuwan, Guangxi and Its Significance in Dividing the Boundary Line Between Tropical and Subtropical Regions in China (To be continued) Growth release determination and interpretation of Korean pine and Koyama spruce in Shengshan National Nature Reserve, Heilongjiang Province, China