| 单词 | mor humus |
| 释义 | > as lemmasmor humus Humus which forms a discrete layer on top of the soil and has little or no mineral soil mixed with it, characteristic of coniferous forests and usually strongly acidic. Also mor humus. Cf. mull n.10 ΘΚΠ the world > the earth > structure of the earth > constituent materials > earth or soil > kind of earth or soil > [noun] > organic soil > humus humus1796 raw humus1891 mull1923 mor1931 1931 Ecology 12 570 Müller distinguished two main types of humus layer called mull..and mor. 1952 P. W. Richards Trop. Rain Forest ix. 218 The humus of rain-forest soils..would appear to resemble the ‘mull’ rather than the ‘mor’ of temperate forest soils. 1971 Nature 10 Sept. 133/1 Formation of the mor type of forest litter..has been attributed to a number of factors. 1984 Fortune 28 May 110/3 At least one of these natural filters, the so-called ‘mor humus’, can put far more acid into the rainwater than could any anticipated amount of industrial pollution. 1988 Forestry 61 356 Birch brings about a change of humus condition, from mor to mull. < as lemmas |
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