珠江口伶仃洋的海涂土壤资源

伶仃洋是珠江口东北部浅海湾,汇集珠江东四口门的来水,在潮间带及紧邻的潮下带(-5米以浅)形成大片海涂。土壤质地较粘重,有机质含量在1.5—2.2％之间,含盐量为0.2—1.5％,pH 为6.5—8.0,自然肥力较高,有很高的开发利用价值。因潮位带和生态条件不同,可分为 1.宜农围垦带,集中于西部浅滩,土壤含盐量较低,有机质和磷钾养分丰富,宜种水稻、甘蔗、香蕉等作物;2.水产养殖带,包括不宜围垦的潮间带和向海侧的潮下带,宜养鲻鱼、对虾、牡蛎等;3.城市、港口和工业填海造陆岸段,集中于东部浅滩。

THE RESOURCES OF TIDAL FLAT SOILS OF LINGDING BAY IN THE ZHUJIANG RIVER MOUTH

The Lingding Bay, 2110km2 in erea, is situated in the northestern part of the zhujiang River mouth in Guangdong Province. The area abounds in resources of tidal flat soils. Through centuries the inhabitants of the area have built dikes around it and brought it under cultivation. The main crops are rice and sugar cane.The present paper discusses the physico-chemical properties of the soils. Its texture is medium clay. The salt and organic matter contents are generally 0.2-1.5% and 1.5-2.2%, respectively. They are mostly neutral-alkaline in reaction with pH value (between, 6.5-8.0). The natural fertility of the soils is high. The soil data are very useful for the area development, especially for the rational production system of agriculture and fishery. The development prospect of this area is very promising.