Soil water content also affected soil respiration.

土壤水分对土壤呼吸有一定影响。

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Moreover, different type of wind affected soil samples in various ways.

此外，风的类型对土体的风蚀作用也不同。

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The content of soil organic matter affected soil swelling rate remarkably when soil texture was not obviously different.

有机质含量在质地差别不明显情况下，对土壤膨胀率也有极显著的作用与影响；

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The report says people living near incinerators may be exposed to a range of toxic chemicals, by breathing in contaminated air, eating food which has been contaminated, or by skin contact with affected soil.

BBC: Greenpeace damns incineration 'risks'

It doesn't seem to be affected all that much by climate, soil conditions, geographical location, growth rate, tree size or disease.

NPR: Excerpt: 'A Splintered History Of Wood'