潮间带鳗草海草床微生境中鳗草幼苗的分布特征

Characteristics of Distribution of Eelgrass Seedlings in Microhabitats of Eelgrass Seagrass Bed in Intertidal Zone

摘要: 为判断以沉积物容重为指征的微生境是否与鳗草海草床出土幼苗的分布相关联，在山东威海杨家湾潮间带鳗草海草床随机调查了鳗草幼苗的分布情况。结果显示：微生境间的幼苗密度无差异；沉积物容重1.4 g•cm⁻³的微生境中，幼苗均匀分布，出土幼苗发生频率与种子埋深有关；沉积物容重1.5、1.7 g•cm⁻³的微生境中，幼苗集群分布，出土幼苗发生频率和种子埋深无关；沉积物容重1.6、1.8 g•cm⁻³的微生境中，幼苗集群分布，出土幼苗发生频率和种子埋深有关；同一种子埋深条件下，出土幼苗发生频率不随沉积物容重变化。

Abstract: To judge whether microhabitat indicated by sediment bulk density is related to distribution of seedlings unearthed from eelgrass seagrass bed, the distribution of eelgrass seedlings was ran-domly investigated in an eelgrass seagrass bed in intertidal zone of Yangjia Bay, Weihai, Shan-dong Province. There was no difference in seedling density among microhabitats. In the micro-habitat with sediment bulk density of 1.4 g•cm⁻³, the seedlings were evenly distributed and the occurrence frequency of unearthed seedlings was related to burial depth. In the microhabitat with sediment bulk density of 1.5 or 1.7 g•cm⁻³, the seedling was the clusters distribution pat-tern and the occurrence frequency of unearthed seedlings had nothing to do with burial depth. In the microhabitat with sediment bulk density of 1.6 or 1.8 g•cm⁻³, the seedling was the clusters distribution and the occurrence frequency of unearthed seedlings was related to burial depth. If burial depth was given, the occurrence frequency of unearthed seedlings did not change with bulk density of sediment.