中文摘要：

社区结构和有在北华南海的环境因素的免费生活的海洋的线虫和他们的关系的生物多样性上的量的研究基于在深海在五个车站收集的样品被执行(从 313～1 600 m )并且浅水里的一个车站( 87 m )在在2010年9月的巡航期间。结果证明许多水兵线虫从 224 ～ 1 996 ind./(10 厘米 ²) 。69 个免费生活的海洋的线虫类的一个总数，属于 26 个家庭和三份订单，被识别。最主导的类是 Sabatieria， Linhystera， Aegialoalaimus 和 Daptonema 根据痴笑分析。簇分析的结果揭示了海洋的线虫社区的四种类型(或车站组) 在采样区域。以营养的结构，非选择的存款 feeders (1B ) 和选择存款 feeders (1A ) 是有最高的类数字和丰富的主导的营养的类型，它暗示那器官的岩屑是在北华南海的海洋的线虫的主要食物来源。男线虫的百分比是低的，从 2.22% ～ 17.81%，当那些从 36.99% ～ 82.09% 少年个人时。为海洋的线虫的类水平差异， Shannon 牛肉熏香肠差异索引(H) 从 3.76 ～ 4.57 并且与水深度有高度重要的否定关联。一般来说，在五点的差异索引 H 在深海(超过 200 m ) 驻扎在浅水(87 m ) 里的车站是比那低的。BIOENV 分析证明控制海洋的线虫社区的最重要的环境因素是水深度。

英文摘要：

A quantitative study on the community structure and biodiversity of free-living marine nematodes and their relationship with environmental factors in the northern South China Sea were carried out based on the samples collected at five stations in the deep sea （from 313 to 1 600 m） and one station in shallowwaters （87 m） during the cruise in September, 2010. Results showed that the abundance of marine nematodes ranged from 224 to 1 996 ind./（10 cm2）. A total of 69 free-living marine nematode genera, belonging to 26 families and three orders, were identified. The most dominant genera were Sabatieria, Linhystera, Aegialoalaimus and Daptonema according to SIMPER analysis. Results of CLUSTER analysis revealed four types of marine nematode community （or station groups） in the sampling area. In terms of trophic structure, non-selective deposit feeders （1B） and selective deposit feeders （1A） were the dominant trophic types with highest genera numbers and abundances, which implied that organic detritus was the main food source of marine nematodes in the northern South China Sea. The percentage of male nematode was low, ranging from 2.22% to 17.81%, while those of juvenile individuals ranged from 36.99% to 82.09%. For genera level diversity of marine nematodes, Shannon-Wiener diversity indices （H＇） ranged from 3.76 to 4.57 and had highly significant negative correlation with water depth. In general, diversity indices H＇ at the five stations in deep sea （over 200 m） were lower than that at the station in shallow waters （87 m）. BIOENV analysis showed that the most important environmental factor controlling marine nematode communities was water denth.