Rapid sex identification of Atlantic salmon (Salmo salar L.) by real‐time PCR          下载免费PDF全文

Jonhard Eysturskarð  Margreta Dam  Sunnvør Klettskarð í Kongsstovu  Ása Jacobsen  Petra E Petersen 《Aquaculture Research》2017,48(5):2618-2620

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Impact of short‐rotation coppice with poplar and willow on soil physical properties     

Petra Kahle  Manon Janssen 《植物养料与土壤学杂志》2020,183(2):119-128

As the land area of short‐rotation coppice (SRC) increases, their soil physical impacts have to be evaluated. The objective of this study was to detect the effects of long‐term SRC with poplar and willow on the vertical distribution of soil physical properties (bulk density, water retention, penetration resistance) and on solute transport patterns. An 18‐year‐old SRC located in northeastern Germany was compared to an adjacent continuous arable cropping system by means of soil sampling, penetrologger measurements and dye tracer experiments. The topsoil's bulk density was significantly lower under SRC than under cropland. This effect was especially pronounced in the uppermost 10 cm, where also the air capacity and the plant‐available water content were higher under SRC. The penetration resistance in 25–50 cm depth was reduced under SRC compared to the cropland, indicating a loosening of the plough pan. Dye tracer experiments showed that the importance of preferential flow was higher under SRC due to tree root channels and an increasing colonisation with invertebrates. SRC has ecologically advantageous effects on soil physical properties of the topsoil, however, combined with an enhanced risk of preferential solute transport upon application of agrochemicals.  相似文献   

The plant functional traits that explain species occurrence across fragmented grasslands differ according to patch management,isolation, and wetness     

Petra Janečková  Štěpán Janeček  Jitka Klimešová  Lars Götzenberger  Jan Horník  Jan Lepš  Francesco de Bello 《Landscape Ecology》2017,32(4):791-805

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