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为了阐明滨海湿地不同密度柽柳(Tamarix chinensis)林的生长动态,探索滨海湿地柽柳林的密度合理性,在黄河三角洲莱州湾南岸的山东昌邑海洋生态特别保护区内,利用标准木树干解析法,对10a生的3种密度(2400株/hm2、3600株/hm2和4400株/hm2)的柽柳林地上生物量、林木生长动态和基径分布特征进行研究。结果表明,3种密度林分的地上生物量、树高生长量和林木基径生长过程差别较大。随着林分密度增大,林木单株生物量和基径减小,但单位面积林分生物量增加;树高、基径的速生期都出现滞后现象。3种密度林分基径分布的偏度系数(SK)差别较大;密度为3600株/hm2林分的SK值为0.085,接近正态分布,林分密度结构和基径分布较为合理;密度为2400株/hm2和4400株/hm2林分的SK值分别为-0.842和0.303,偏离正态分布,林分密度结构不合理。密度为2400株/hm2林分的峰度系数(K)为0.017,林木生长相对整齐;密度为3600株/hm2和4400株/hm2林分的K值相差不大;密度因素对林木分化作用较小。若不考虑10a间的林木间伐利用,该区柽柳人工造林合理的初植密度建议为3600株/hm2(株行距约2.0m×2.0m)。
In order to clarify the growth dynamics of Tamarix chinensis forest in coastal wetlands and to explore the density rationality of Tamarix chinensis forests in the coastal wetlands, using the standard tree trunk analysis method in the Changyi Marine Ecological Special Protection Area on the south coast of Laizhou Bay in the Yellow River Delta, The aboveground biomass, tree growth dynamics and basal diameter distribution of Tamarix elongata at 3 density (2400 plants / hm2, 3600 plants / hm2 and 4400 plants / hm2) were studied. The results showed that the aboveground biomass, tree height growth and tree basic growth differed greatly among the three stands. With the increase of stand density, the biomass and the base diameter of single plantation decreased, but the stand biomass per unit area increased. The hysteresis appeared at the fast growth stage of tree height and base diameter. The skewness coefficient (SK) of base density distribution varied greatly among three kinds of density stands. The SK value of stand with density of 3600 plants / hm2 was 0.085, close to normal distribution, and the stand density structure and base diameter distribution were more reasonable. The density The SK values of 2,400 plants / hm2 and 4400 plants / hm2 were -0.842 and 0.303, respectively, deviating from the normal distribution and the stand density structure was not reasonable. The kurtosis coefficient (K) of 2400 plant / hm2 stands was 0.017, and the growth of forest trees was relatively neat. The K values of 3600 plants / hm2 and 4400 plants / hm2 had no significant difference. small. If we do not consider the inter-decadal use of interforestation, the reasonable planting density of Tamarix chinensis in this area is 3600 plants / hm2 (plant spacing of about 2.0m × 2.0m).