云南亚高山云冷杉林林窗的研究

Canopy gaps in subalpine spruce fir forests of the hills around Bitahai Lake, Yunnan Province

研究了云南碧塔海两块亚高山云冷杉（Ｐｉｃｅａ－Ａｂｉｅｓ）林内中小尺度林窗的干扰体系，结果表明：林窗和扩展林窗分别占林地面积的１９％和４１％，平均面积为４４ｍ２和１３９ｍ２，林窗的形成频率为０．００５～０．００７／ｙ。估计平均林窗周期为１６７年。大多数林窗（占８７％）的制造林窗树木（ｇａｐ－ｍａｋｅｒ，简记为ＧＭ）为１个以上，平均每个林窗的ＧＭ为２．９个，同一林窗内的ＧＭ常常死于不同的时间。在所有调查的ＧＭ中，折断占６０％，而根拔和直立死亡分别为２８％和１２％

The disturbance regime of small and middle scale gap in two stands of a subalpine old growth Picea Abies (spruce fir) forest around Bitahai Lake, north west corner of Yunnan Province, were examined. Canopy gaps and expanded gaps covered 19% and 41% of total land area. The mean area of gaps and expanded gaps were 44 m 2 and 139 m 2 respectively. The gaps were formed with a frequency of 0.005 to 0.007 per year, and the estimated mean gap return interval was 167 years. Most gaps (87%) had more than one gap maker (overall means: 2.9 gap makers per gap), and gap makers within a gap were often from mortality events in separated time. In all gap makers investigated snap were 60%, but uproot and died standing were 28% and 12% respectively.