Lake Peipsi 1974 (Phytoplankton samples)

Method: Up to 1988 the samples were preserved with formaldehyde (not neutralised), and lots of samples were spoiled: sample sediment was flaked, stuck together, or rusty. By this reason, a number of results of countings are not representative.

实验方法：1988年以前，所有样本均采用未中和甲醛（formaldehyde）进行固定保存，导致大量样本出现变质：样本沉积物出现剥落、粘结成团或锈蚀情况。受此影响，多项计数结果不具备代表性。