为探究吕家坨井田地质构造格局,根据钻孔勘探资料,采用分形理论和趋势面分析方法,研究了井田7......

The Araucaria forest ecosystem in southern Brazil is highly threatened: less than one percent of the original forest rem......

4种南洋杉科树种引种至广东省开平市镇海林场,6年生林分生长结果显示：肯氏南洋杉适应性强,保存率高,生长较快,是表现最好树种;其次......