Define horn fruit layers of thickness and horn fruit layers of density rape important colony quality index; it is the comprehensive economic indicator too.
明确了结角层厚度与结角层密度是油菜重要的群体质量形态指标，也是综合性经济指标。
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"Thickness is important, especially in the winter, because it is the best overall indicator of the health of the ice cover," said NSIDC scientist Walt Meier.
Based on the comprehensiveness of forest coverage rate, total standing forest stock, average forest volume, a new indicator called 'Forest Thickness'(FT) is put forward in this paper.