【摘要】 <正> 一.绪言本项工作的目的,在初步了解渤海海岸盐土和砂土地带的植物群落组成的特点,找出它们的分佈如何受海潮、海水浪花、小地形和土壤的影响,并且对于调查植物群落的方法藉以进行研究。因为工作时间短促,对于山地酸性灰棕壤的植物,只就所采集的标本,作简略叙述,以供比较;所以植物群落分布图(462页)也是初步草图,希望日后另作进一步的调查,再作更正。更多还原

【Abstract】 The area surveyed lies in the eastern part of Hopei province in latitude 39°55′ north,longitude 119°58′ east.The mean annual precipitation of the area is 666 mm,annual mean temperature,9.9℃.Physiographically, the area is a part of the sea coast of the Gulf of Pohai,which is characterised by maritime vegetation,affected more or less profoundly by the neighbourhood of the sea.The plant associations observed in the area are enumerated in the following: 1.The sandy sea shore constantly exposed to the direct effect of the tides and to salt spray supports a characteristic vegetation of halophytic psammophytes,named Cared Kobomugi-Calystegia soldanella-Ixeris repens Association. 2.Iris dichotoma-Ephedra sinica-Allium anisopodium Association is found on the terrace of the sandy sea shore on exposed coast,not reached by tides but subject to the effect of sea spray driven on to the land by the wind, which shows a mixture of halophytic and non-halophytic species. 3.The saline soil protected from the violent wave action,exposed to immersion in salt water at some high tides composes of halophptes or halophilous plants,many of them growing only when supplied with salt water, though other,can do without it.There occurs Suaeda ussuriensis-Statice bicolor-Artemisia scoparia-Scorzonera mongolica-Aeluropus littoralis Association. 4.The salt-marsh community,Salicornia herbacea-Suaeda ussuriensis, has much in common with that of the above-mentioned one,but includes more hydrophytic species. 5.In the coastal sand-dunes the soil on the slope shows a pH of 6.5, while that on the depression,a pH of 8.0-8.5,The community is less exposed to the direct effect of the tides but shows more or less maritime influence because of salt ground water. 6.The vegetation of the hilly area being out of reach of the tides and not subject to the effect of sea spray shows the absence of any halophytic species. There appears Pinus tabulaeformis-Quercus sp.-Themeda japonica Association. The plant associations just enumerated except the last one are not only constantly found in proximity because they all depend on maritime influence, they are also frequently interdependent.更多还原