论文部分内容阅读
为探讨辽东山区次生林林窗干扰特征,对不同坡向雪/风干扰后形成林窗内的光温空间分布特征进行了研究。结果表明:东北和东南坡向的林窗中,各时段光量子通量密度(PPFD)和气温的空间分布格局类似但大小并不相同;8:00—10:00 PPFD最高值均出现在林窗中央偏西(东北坡169μmol·m-2·s-1,东南坡350μmol·m-2·s-1),11:00—13:00PPFD最高值出现在林窗中央偏北侧(东北坡234μmol·m-2·s-1,东南坡400μmol·m-2·s-1),而14:00—16:00均以林窗东侧PPFD最大(东北坡74μmol·m-2·s-1,东南坡56μmol·m-2·s-1),且两个坡向的PPFD在各时段大小差异显著(P<0.05)。两个坡向林窗内平均气温的空间分布均表现为8:00—10:00西高东低,11:00—13:00北高南低,14:00—16:00东高西低的趋势,而在各时段的差异为8:00—10:00、11:00—13:00东北坡气温显著低于东南坡(P<0.01),14:00—16:00则显著高于东南坡(P<0.01)。上述结果表明,林窗坡向及林窗内位置不同,使其光温环境发生异质性,进而影响到林窗区域种子萌发、幼苗生长发育及植物种群分布等,最终影响到森林的更新。
In order to explore the characteristics of the secondary forest gap disturbances in eastern Liaoning mountainous areas, the spatial distribution characteristics of light and temperature in the gap gaps formed after the different slope snow / wind disturbance were studied. The results showed that the spatial distribution pattern of PPFD and temperature was similar but not the same in the northeast and southeast asphalts, and the highest PPFD appeared in the gap between 8:00 and 10:00 In the central part of the western part of China, the highest value of 169PPDD at the northeast slope (169μmol · m-2 · s-1 in the northeast slope and 350μmol · m-2 · s-1 in the southeast slope) · M-2 · s-1 and southeast slope of 400 μmol · m-2 · s-1), while the maximum PPFD (74 μmol · m-2 · s-1 And 56 μmol · m-2 · s-1 in the southeast slope), and the differences of PPFD in the two slopes were significant (P <0.05). The spatial distribution of the average temperature in the two sloping gaps was as follows: 8: 00-10: 00 in west and east low, 11: 00-13: 00 in north and south low, 14: 00-16: 00 in east and west low While the difference was 8: 00-10: 00 and 11: 00-13: 00 in each period, the temperature in the northeastern slope was significantly lower than that in the southeast slope (P <0.01), and significantly higher than that in the southeast Slope (P <0.01). The above results show that the different position of the gap in the gap and the gap in the gap led to the heterogeneity of the light and temperature environment, which in turn affected the seed germination, the seedling growth and development and the distribution of the plant population in the gap and ultimately affected the forest renewal.