采伐迹地青■和云杉两种人工群落生长规律的初步研究

PRELIMINARY STUDY ON THE GROWTH LAW OF PICEA ASPERATA AND P. WILSONII ARTIFICAL COMMUNITY ON CLEAR CUT AREA

研究了采伐迹地３２ａ生的青（Ｐｉｃｅａｗｉｌｓｏｎｉ）和２９ａ生的云杉（Ｐｉｃｅａａｓｐｅｒａｔａ）两种人工群落平均木地径（Ｄｂ／ｃｍ）、胸径（ＤＢＨ／ｃｍ）、树高（ｈ／ｍ）、生物量（Ｖｉｎｄ／ｍ３）以及群落的生物量（Ｖ／ｍ３ｈｍ－２）生长过程，探讨了两群落的生物量和两种群个体数分布规律．主要结果为：①云杉的平均带皮地径（Ｄｂｂ／ｃｍ）、带皮胸径（ＤＢＨｂ／ｃｍ）、平均ｈ和Ｖｉｎｄ分别为１６．３、１２．９、９．１４、０．０５９０８，而青的则分别为８．１、５．２、５．６５、０．００５７１．②云杉和青群落的Ｖ／ｍ３·ｈｍ－２分别是１５５．０９和２３．５５．③云杉Ｄｂ、ＤＢＨ、ｈ、和Ｖｉｎｄ生长高峰期分别在树龄１０～１６ａ、１４～１８ａ、２０～２４ａ和２０ａ；而青的上述值生长高峰期则分别在树龄２４ａ、１８～２２ａ、２０～２４ａ和３２ａ．④按胸径级分布，云杉和青群落中胸径＜１３ｃｍ的个体的Ｖ分别占各群落总生物量（Ｖｔ）的２５．５１％和１００％；其个体数分别占各群落总个体数的５８．７４％和１００％．⑤按生长级分布，云杉和青群落的Ｉ、Ｉ级木的Ｖ分别占各群落Ｖｔ的９０％和５７．６４％；其个体数分别占各群落总个?

The growth processes,such as the basal diameter ( D b/cm), D.B.H. ( D BH /cm),tree height ( h /m) and biomass of average individuals ( V ind /m 3) and community biomass of 29 a P. asperata community and 32 a P. wilsonii community were studied, and, the distribution law and the individual number of the two communities were also discussed. The results indicated as:①The average basal diameter with barks ( D bb /cm), D.B.H. with barks ( D BHb /cm), tree height and biomass of P. asperata community were 16.3 cm,12.9 cm,9.14 m and 0.05908 m 3 per individual, respectively, and those of P. wilsonii community were 8.1 cm, 5.2 cm, 5.65 m and 0.00571 m 3, respectively. ②The biomass of the P. asperata community and P. wilsonii community were 155.09 m 3/hm 2 and 23.55m 3/hm 2. ③The fastest growth age for basal diameter,D.B.H.,tree height and biomass of P. asperata were 10～16 a,14～18 a,20～24 a and 20 a old, and those for P. wilsonii were 24 a,18～22 a,20～24 a and 32 a old. ④The biomass and individual number of P. asperata whose D.B.H. was less than 13 cm were 25.51% and 58.74% of the total, respectively, and those of P. wilsonii were 100% and 100% of the total. ⑤The biomass and individual number of P. asperata including class I(best) and class II(better) were 90 and 63.7% of the total, and those of P. wilsonii were 57.64% and 22.08%, respectively.