深圳湾北岸泥滩大型底栖动物次级生产力研究

Secondary production of macrobenthos on the mudflat of northern Shenzhen Bay

根据2005年3、6、9月和12月在深圳湾北岸泥滩9个取样站采集的大型底栖动物4个季度的定量样品,运用Brey(1990)的经验公式进行了大型底栖动物栖息丰度、生物量、次级生产力和P/B值的研究计算.整个研究区域大型底栖动物年次级生产力平均值(去灰干重)为54.55g/(m2.a),其中观鸟屋附近泥滩(A断面)较高,为68.85g/(m2.a),凤塘河口附近泥滩(H断面)为50.62g/(m2.a)次之,沙嘴码头附近泥滩(F断面)较低,为44.18g/(m2.a),深圳湾北岸泥滩大型底栖动物年平均P/B为2.95.可见,大型底栖动物次级生产力越靠近深圳河河口越低,这与越靠近深圳河河口,大型底栖动物个体越小、生活史更短的结果是一致的.

Base on the macrobenthos samples taken in 9 stations on the mudflat of northern Shenzhen bay in 4 surveys in 2005, data on the biomass and abundance of macrobenthos was obtained. Using Brey＇s（1990） empirical formula,we calculated the secondary production and P/B ratio with result that the mean secondary production of macrobenthos in the studied area is 54. 55g（AFDW）/（m^2 · a）.The transect A at the intertidal mudflat of northern Shenzhen bay had the highest production which was 68.85g（AFDW）/（ m^2 · a） ,the production of the transect H was 50. 62g（ AFDW）/（ m^2 · a）, and the transect F had the lowest value which was 44. 18g（AFDW）/（ m^2 · a）. The mean P/B ratio of macrobenthos was 2. 95. It shows that the secondary production of macrobenthos decreases with smaller body size and shorter life span towards the Shenzhen River estuary.