长三角地区红豆杉的造林栽培与生态功能分析

Afforestation,Cultivation and Ecological Function Analysis of Taxus chinensis in the Yangtze River Delta

为了探讨长三角地区红豆杉(Taxus chinensis (Pilger) Rehd.)的造林栽培以及生态功能,本研究考察了长三角沿海地区红豆杉造林栽培以及生态功能情况,在两轮冬季海水过后测量树苗生长变化;通过冗余分析确定主要影响因素;评估实验造林区和附近对照区之间的草本群落相似性,以检测实验造林对生态系统的影响。结果发现,红豆杉种植在海拔163 m以上的树苗成活率87.93%;所有测量的生长指数(树高,胸高直径,树冠宽度和树叶密度)随着海水深度的增加而下降;完全淹没的树苗的平均枯死高度为-0.67 m,较大初始叶密度导致树高和茎直径增加;Shannon-Wiener指数在试验区和对照区之间没有显著差异,但试验区和对照区之间草本植物群落的相似性较低(平均为0.238),表明植树造林可以丰富植物群落结构,提高沿岸带生态系统的稳定性。初步研究表明,红豆杉可以为长三角沿海地区造林提供多种生态系统服务,也是一种很有前景的风景植物。

tTo explore the afforestation and ecological function of Taxus chinensis(Pilger)Rehd.In Yangtze River Delta.This study investigated the afforestation,cultivation and ecological functions of Taxus chinensis in the coastal area of the Yangtze River Delta,and measured the growth changes of seedlings after two rounds of winter seawater;determine the main influencing factors through redundancy analysis;assess the similarity of herb communities between the experimental afforestation area and the nearby control area to detect the impact of experimental afforestation on the ecosystem.The results showed that the survival rate of seedlings of Taxus chinensis planted above 163 m above sea level was 87.93%;all measured growth indexes(tree height,breast height diameter,crown width and leaf density)decreased with the increase of sea water depth;the average dead height of completely submerged seedlings is-0.67 m,and the higher initial leaf density leads to the increase of tree height and stem diameter;the Shannon-Wiener index has no significant difference between the test area and the control area,but the similarity of the herb community between the test area and the control area is low(average 0.238),indicating that afforestation can enrich the plant community structure and improve the stability of the coastal zone ecosystem.Preliminary research shows that Taxus chinensis can provide a variety of ecosystem services for afforestation in the coastal areas of the Yangtze River Delta,and is also a promising landscape plant.