底质

Marine benthos are characterized by narrow activity and special territory distribution and can be used to indicate the quality of water and the polluted condition of sediments, which plays an important part in the biologic indication of marine pollution.

海洋底栖动物活动性小、地区性强，可以较好地反映水质和底质的污染状况，在海洋污染生物学指标中具有特别重要的意义。

The results indicate that Charybdis japonica is distributed mainly in the Dasha, Changjiangkou fishing ground that is in the north of (31°00′N), few is distributed in the south of (31°30′N).

结果表明：日本主要分布在31°00′N以北的大沙、长江口渔场，在31°30′N以南很少有分布，底质为沙或泥沙质。

Effects of Acetic Acid on Germination and Bud Growth of Elodea nuttallii and Potamogeton crispus

篇名 富营养底质对沉水植物的胁迫研究Ⅰ。乙酸对伊乐藻和菹草萌发与幼芽生长的影响

In order to investigate the relationship between ammonia in the sediment and the physiological and biochemical characteristics of macrophytes, Vallisneria natans L and Elodea nuttallii were planted in the sediments of seven different concentrations of ammonia.

和伊乐藻Elodea nuttallii两种沉水植物的植株鲜物质量的变化、干物质量、根系的活力、过氧化物酶和过氧化氢酶活性，以期明确这两种沉水植物与水体底质浓度之间的关系。

This chemical can make the shrimp exuviate in an earlier period, having them grow more quickly, and assist the decomposition of organic fertiliser accelerating the growth of the algae.

由于茶粕粉的蛋白质含量较高，因此它还是一种高效有机肥，对淤泥少、底质贫瘠的池塘可起到增肥作用。

In order to achieve higher accuracy in probing seabed property, forming the image of lineation with higher sonar strength becomes a basic rule for judgment.

必须利用声纳在线形的优势成像以及强度具有鉴别度的条件下，进行海床底质的推估，才具有较高的正确性。

So this study can also been used to separate the sandy sediments and the silty sediments.

通过界面散射对不同底质海底影响的研究，也可将砂质海底与泥质海底比较明显地区分开来。

Seasonal reproduction of marine sessile organisms may be an adaptation of seasonal variation in suitable substratum availability.

海洋生物年周期性的生殖行为可能是为了天然底质年周期性变动的一个适应结果。

Uneven distribution of tideland sediment caused by the strong tidal current action in Hangzhou Bay, and nature ecological distribution of macrofaunal in the tideland, is a part reason of tideland environmental quality change.

杭州湾强烈的潮流作用导致的潮间带底质分布不均匀，以及底栖生物在潮间带的自然生态分布，是潮间带环境质量变化的部分原因。

The amounts of Limnodrilus hoffmeisteri with high pollution resistibility increased gradually from Baihe to Huacao section, and reached a peak in Huacao section; species from Annelida, Mollusca were not found in Beixinjing and Wuninglu sections due to heavy sediment pollution; species from Oligochaeta were found again and had certain numbers in Zhejiang road section as the result of the effect of courterflow of the Huangpu River.

从白鹤至华槽断面，高度耐汙霍甫水丝蚓数量趋於增加，並在华槽断面形成明显数量高峰；北新涇、武寧路河段底质汙染严重，环节动物、软体动物消失；浙江路断面受黄浦江&逆流&，寡毛纲动物再度出现，並形成一定数量。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失