The results are as follows:① The population structure of Picea schrenkiana-Dryopteris filix-mas pure stands is stable, the patterns of age, diameter and the height of Picea schrenkiana-Dryopteris filix-mas pure stands are all in inverse J-shaped curves, indicating a typical uneven-aged stand structure.

以西天山國家自然保護區(qū)內1 hm^2原始鱗毛蕨(Dryopteris filix-mas)天山云杉純林臨時標準地調查材料為基礎，分析鱗毛蕨天山云杉林胸徑农村老熟妇乱子伧视频、樹高和年齡結構外国操逼视频网站、種群存活曲線以及基本測樹因子之間的相互關系。

Control method were applied to natural mixed uneven-aged stands at the first time in China, and its inventory method were improved.

本研究將檢查法應用于我國天然針闊混交林經(jīng)營四川一级毛片美女，并對調查方法加以改進黄大片视频在线观看大片。

that: uneven-aged, double layer and mixed structure were the key elements of forest structure.

目前，北京山區(qū)天然林結構多為異齡综合婷婷色色、復層和混交黄色免费视色，而人工林多數(shù)是同齡、單層和純林国产一级a爱免费视频在线。

This research not only provided management technology and method for the mixed uneven-aged stands of coniferous and broad-leaved trees in Changbai mountains, also it have important referring value on the mixed uneven-aged stands management in other area.

本研究不僅為長白山地區(qū)云冷杉針闊混交林的經(jīng)營利用提供了方法技術国产原创中文在线观看视频，而且對其他林區(qū)的針闊混交林經(jīng)營也有著重要的參考價值和借鑒意義。

The confirmation method of mature level in uneven-aged forest is an insoluble problem both in forestry theory and forestry production at present.

以林木經(jīng)濟成熟徑級確定為例射射射射射偷拍，通過徑級價值量被其徑級材積除的模式轉換辦法特级毛片全部免费播放A一级，解析異齡林林木成熟的確定方法，進而為改善林業(yè)生產中異齡林采伐的盲目性提供依據(jù)99re在线视频。

uneven-aged forest：異齡林

understocked立木度不足的 | uneven-aged forest異齡林 | uniform flow均勻流;等速流

uneven-aged stand：異齡林

過熟林分;老齡過熟林分(木) overmature stand | 異齡林 uneven-aged stand | 不規(guī)則林;不整齊林 irregular stand

uneven-aged stand：異齡林分

異齡林 Uneven-aged forest | 異齡林分 Uneven-aged stand | 同Uneven-aged forest Uneven-aged wood

Uneven-aged forest Uneven-aged wood：同

異齡林分 Uneven-aged stand | 同Uneven-aged forest Uneven-aged wood | 圓材 Unhewn timber