Note: Different letters in the same column mean significant at 5 % level, same as follows.

注: 同一列数据不同字母表示差异达5%显著水平, 下同.

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Note: The different superscript letters within the same column mean statistical significant difference ( P 0.05 ).

注: 同列上标含有不相同字母表示差异显著 ( P0.05 ).

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Note: Different letters in the same column mean significant at the 0105 level, same as follows.

注: 同列数据不同字母表示差异达0105显著水平, 下同.

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