雷州半岛东海岸海涂土壤

雷州半岛东海岸潮间带及其紧邻5m等深线以上海涂约211万亩,土壤分1个土类(潮滩土)3个亚类和8个土种。因腹地植被生长较差和成土母质的矿质养分较低,故海涂土壤的有机质和磷、氮含量不高,铜、锌、锰等微量元素含量也低于全国土壤平均水平。土壤含盐量是随质地和滩面水的总盐量的变化而不同,如潮滩沙土由小于0.5%至3.3%。本区地表水量不充裕,但滩面平坦和避浪条件较好,适宜发展海水养殖,部分泥质或沙泥质潮滩土尚有围垦种植的可能。

STUDY ON BEACH SOILS OF EAST COAST OF LEIZH PENINSULA

The beach soils of intertidal zone and its immediate neibour above negative 5m isoline in east coast of Leizhou Peninsula have a area about 1.41X105ha.The beach soils are classified into one greatgroup,three subgroups and eight species.Because the vegetion is poor and mineral nutrient such as phosphorus and manganese in parent materials is low in the beach land,therefore,the contents of organic matter,nitrogen and phosphorus are low and contents of microelement such as Cu,Zn and Mn are loewr than mean levels of soil in China.The salinity of soils varies greatly with texture of soils and total salinity of seawater and ranges from<0.5% (sandy tidal flat soil) to 3.3%.The land surface water is not sufficient,but surfaces of beach are considerably flat and the topography is suitable for the protection from the wave in this area.It is good for the development of maricuture.A small fraction of beach soils such as muddy and sand-muddy tidal flat soils has the posibility for the reclaimation by embankment.The development prospect of the area is very promismg.