Saihanba in Hebei Province was once a desert, but now it has become the biggest man-made forest in China.
河北省的塞罕坝曾经是一片沙漠，但现在它已经成为中国最大的人工林。
The timbers of our country man made forest have poor quality and some defects, which indicate their low strength and unstable size.
我国目前人工林本材材质差、缺陷多，主要表现在强度低、尺寸稳定性差。
Result shows, This competition index is suitable to Chinese fir man-made forest, and individual tree growth model accords with the demands of accuracy, it can be used to estimate growth of stands.
结果表明：该竞争指标对杉木人工林适用，所建立的单木生长模型符合精度要求，可用于预估林分生长。
Result shows, This competition index is suitable to Chinese fir man-made forest, and individual tree growth model accords with the demands of accuracy, it can be used to estimate growth of stands.
结果表明：该竞争指标对杉木人工林适用，所建立的单木生长模型符合精度要求，可用于预估林分生长。
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