摘要
根据 1998～ 1999年 4个航次粤西海域浮游植物的调查资料 ,在 GIS的支持下对该海域浮游植物丰度的时空分布特征及其密集中心位置的变化进行了分析和模拟。结果显示 ,粤西海域浮游植物具有明显的时空分布特征。春季、秋季和冬季 3个季节浮游植物丰度的分布趋势相似 ,均呈北部水域高、南部水域低或近岸水域高、离岸水域低的趋势 ,其密集分布区均出现在电白至海陵岛一带的近岸水域 ,其中以冬季密集区的分布范围最广 ,丰度最高 ,平均值达 4 12 .70× 10 4 ind/ m3,其次为秋季 ,丰度的平均值为 14 9.75× 10 4 ind/ m3。与上述 3个季节不同 ,夏季浮游植物的丰度处于全年的最低值 ,平均为 15 .6 4× 10 4 ind/ m3,其相对密集区的分布范围狭小 ,仅出现于川山群岛南侧的小片水域中 ,其余大部分水域的丰度均低于 2 0 .0 0× 10 4 ind/ m3。丰度密集中心的分析结果表明 ,春季、秋季和冬季浮游植物的密集中心位置彼此相近 ,漂移规律不明显 ,而夏季密集中心则明显向东南方向漂移 ,其最大漂移距离横向达 2 4 .74′,纵向达 16 .78′
Based on the 4 cruises investigation data of phytoplankton in the Western Guangdong Waters from 1998 to 1999, we analyzed and simulated the spatial-temporal distribution patterns and the density center variations of phytoplankton cell abundance in the area with the linear interpolation method supported by Geographical Information System (GIS). Our results indicated that there was a distinctive spatial-temporal distribution of the phytoplankton in the Western Guangdong Waters. It had a similar distribution pattern in spring, autumn and winter with a higher cell abundance in the northern region than the southern region, or a higher cell abundance in the inshore waters than the offshore waters. The density areas in above 3 seasons all occurred in the inshore waters from Dianbai County to Chuanshan Islands of Taishan city. The density area in winter covered the largest region with the highest cell abundance, followed by autumn. However, the average phytoplankton cell abundance in all the regions were 412.70×10~4ind/m^3 in winter and 149.75×10~4ind/m^3 in autumn. Differing greatly from the 3 seasons mentioned above, the density area in summer occurred in a narrow area of southern side of Chuanshan Islands. The cell abundance in the density area was higher than 20×10~4ind/m^3 while it was less than 20×10~4ind/m^3 in the most part of the other areas. The average cell abundance was 15.64×10~4ind/m^3, the lowest in the seasons.The seasonal variation of the phytoplankton cell abundance in the Western Guangdong Waters showed a trend of winter > autumn > spring > summer. Species succession during the year highlighted different dominant species in different seasons. The dominant species in spring, summer, autumn, and winter were Eucampia zoodiacus, Chaetoceros curvisetus and Skeletonema costatum (Ecotype: coastal warm-water species and inshore widespread species), Thalassionema frauenfeldii, Navicula subminuscula, Oscillatoria sp., Thalassionema nitzschioides and Skeletonema costatum (Ecotype: estuary low salinity species, offshore low salinity species and inshore widespread species), Thalassionema nitzschioides, Thalassiosira subtilis, Thalassionema frauenfeldii and Navicula subminuscula (Ecotype: offshore low salinity species and oceanic widespread species) and Thalassiosira subtilis and Detonula pumila (Ecotype: oceanic widespread species), respectively. With the cell abundance of 1295.3×10~4ind/m^3 and 29.5% of the total abundance, Thalassiosira subtilis was the most abundant species, followed by Eucampia zoodiacus (955.0×10~4ind/m^3 and 21.8% of the total). Our studies on the density center showed the geographical positions of the density center in spring, autumn and winter were close to each other without any obvious excursion, but in summer the density center shifted significantly to the southeast of the investigation region. From spring to summer, the density center shifted east of 24.74′ in longitude and south of 15.74′ in latitude, and from summer to autumn, the density center shifted west of 16.48′ in longitude and north of 16.78′ in latitude.
出处
《生态学报》
CAS
CSCD
北大核心
2004年第10期2143-2148,共6页
Acta Ecologica Sinica
基金
国家海洋勘测专项资助项目 ( HY12 6-0 2 -0 3 )
广东省重大科技兴海资助项目 ( A2 0 0 0 99E0 1)~~
关键词
GIS
浮游植物
时空分布
密集中心
粤西海域
GIS
phytoplankton
spatial-temporal distribution
density center
Western Guangdong Waters
