| 单词 | topsoil |
| 释义 | topsoil noun[U] uk/ˈtɒp.sɔɪl/us/ˈtɑːp.sɔɪl/(thesoilwhichforms) thetoplayerofgroundin whichplantsgrow 表土（层）Compare subsoil Soil
topsoil| American Dictionarytopsoil noun[U] us/ˈtɑpˌsɔɪl/earth science thelayerofearthin whichplantsgrow: richtopsoil Examplesoftopsoiltopsoil Pure declines in nutrient stocks, and losses oftopsoiland soil-physical structures are therefore parallels to the distinction between renewable and exhaustible resources. From theCambridge English Corpus Seeds were then germinated in a shadecloth 'nursery' (4% full daylight), in trays 5 cm deep filled with foresttopsoil. From theCambridge English Corpus Tubs were filled with sandy secondary foresttopsoilover 5 cm of coarse gravel. From theCambridge English Corpus The importance of nutrient input from litterfall to nutrient availability in thetopsoilwas particularly evident in the case of calcium and phosphorus. From theCambridge English Corpus High evapotranspiration rates in these climatic zones bring salts in the soil solution to thetopsoilwhere the salts accumulate after water is evaporated. From theCambridge English Corpus Whentopsoildepth declines to 25 cm, productivity falls by about 75 per cent. From theCambridge English Corpus In fields with deep topsoils, the transitional period occurs between years 25 and 30. From theCambridge English Corpus As thetopsoilwas removed, leaching increased by 40 per cent, on average, over the 30-year time horizon. From theCambridge English Corpus For these species, seed input by humans (sowing) should not be necessary aftertopsoilhas been replaced. From theCambridge English Corpus One soil sample was collected from thetopsoiland one from a depth of 2 m in each pit. From theCambridge English Corpus The environmental objectives of conservation crop research revolve mainly around lowering the intensity of synthetic inputs and reducing activities that instigatetopsoilloss. From theCambridge English Corpus The soil used was a 3:1 (v/v) mixture of limestone-derivedtopsoiland river sand. From theCambridge English Corpus However, almost one third of the geophagical soil samples showed lower concentrations in sodium, calcium and magnesium compared with the mean of foresttopsoil. From theCambridge English Corpus Figure 3 shows that fortopsoildepth greater than 50 cm, inherent productivity is in the range of 4,000 kg of dry matter per ha. From theCambridge English Corpus The fertilizers were incorporated into thetopsoilin a band 50 cm wide on both sides of the hedge. From theCambridge English Corpus These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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