单叶蔓荆生态效应的初步研究

A Preliminary Study on the Ecological Effects of Vitex trifolia var simplicifolia

通过对福建省莆田市平海乡卓东村沿海风沙地单叶蔓荆植被生态效应的调查研究、结果表明：多年生蔓荆植被具有明显的改良土壤作用，表现在其土壤的物理性粘粒含量分别比无植被地、木麻黄地及老鼠刺地的高出23％、33％和23％；速效钾含量分别比后三种植被地高出88％、256％和100％；速效磷含量分别比后三种植被地高出104％、213％和124％；水解氮含量分别比后三种植被地高出310％、107％和105％；有机质含量分别比后三种植被地高出74％、38％和38％；PH值分别比后三种植被地低出0.58、0.54和0.55PH值单位.以上各指标经分析均达显著性差异水平之上．蔓荆植被也具有显著地降低地表风速、改善地表空气湿度和空气温度作用．单叶蔓荆植被改良后的土壤各指标接近于农地水平，并对防护林种木麻黄的生长发育具有明显的促进作用，表现在其地上生长的木麻黄的茎生长和树高生长明显优于无植被地及老鼠刺植被地上生长的木麻黄，且这种差异均达显著水平.

Investigation and analysis on the ecological effects of Vitex trifolia var. simplicifolia growingon the coastal sandy sites in Putian, Fujian, were made. The results showed that the properties of the soilsbeneath V. trifolia var. simplicifolia were significantly different from that beneath other vegetation types inthat region. The contents of physical clay, available potassium, available phosphorus, hydrolytic nitrogen,and organic matter in the soils featuring V. trifolia var. simplicifolia were 23%, 88%, 104%, and 310%greater, respectively, than that at devegetated sites ; 33 %, 256 %, 213 %, 107 %, and 38 % greater, respectively,than that beneath Casuarina equisetifolia ; and 23%, 100%, 124%, 105%, and 38% greater, respectively,than that beneath Symplocos stellaris.. The pH values of the soils under V. trifolia var. simplicifolia, were0. 58, 0. 54, and 0. 55 lower, respectively, than that under the above three mentioned vegetation types. Thesoils developed under V. trifolia var. simplicifolia, of which the physical and chemical properties were similar to arable land, stimulated significantly the growth of diameter and height of Casuarina equisetifiia V. trifolia van. simplicifolia, played a role in decreasing wind speed and regulating temperature and humidity of theair near the ground.