Coring tips
Coring tips
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取芯技巧
DOI：
10.1007/bf00201298
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发表时间：
1991
影响因子：
2.1
通讯作者：
H. E. Wright
中科院分区：
文献类型：
--
作者：
H. E. Wright
这篇评论的目的是作为一个实用的指南，非机动使用活塞盖，以获得未受干扰的湖泊沉积物部分。良好的恢复是准确重建环境和湖泊历史的必要条件。重点放在方杆活塞盖上，它被广泛用于从30米深的湖泊中获取米长的沉积物岩心。开放水域的取心平台可以很容易地在一对船或独木舟上准备，或者（在水深达15米的情况下）甚至是一个小橡胶筏，但牢固的锚定对于保持套管的垂直位置并确保重新进入单孔至关重要。单个驱动器的不完全恢复不是沉积物压实的结果，而是由于管道内部摩擦的积累，岩心形成了一个堵塞，阻止了进一步的恢复。用于研究湖泊近期变化的软沉积物短岩心也最好用活塞盖层获得，因为没有活塞的重力盖层可能会形成相同类型的塞状地层。在必须保存沉积物结构的情况下（例如，每年分层），用干冰溶液将沉积物冷冻到位是最好的方法。
This commentary is intended as a practical guide for the non-motorized use of piston corers to obtain undisturbed sections of lake sediments. Good recovery is essential for accurate reconstruction of environmental and limnological history. Emphasis is placed on the square-rod piston corer, which is widely used for acquisition of sediment cores in meter-long sections from lakes as much as 30 m deep. Coring platforms for open water can be easily prepared on pairs of boats or canoes or (in water depth up to 15 m) even a single small rubber raft, but firm anchoring is essenial to maintain the vertical position of the casing and to assure re-entry into a single hole. Incomplete recovery on individual drives is not a result of sediment compaction but rather the build-up of friction on the tube interior, by which the core forms a plug that prevents further recovery.Short cores of soft sediment for the study of recent changes in lakes are also best acquired with a piston corer, for a gravity corer without a piston may be subject to the same type of plug formation. In cases in which the structure of the sediment must be preserved (e.g. annual laminations), freezing the sediment in place with a dry-ice solution is the best procedure.