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Effects of various continuous cropping times on soil nematode structure in cotton fields of Xinjiang, China Phyton
Li,XL; Wang,YC; Busso,CA; Xiang,JS; Zhang,AM; Qu,YW; Liu,Y.
Long-term continuous cropping of cotton had led to substantial agricultural losses. However, continuous cotton cropping could maintain high crop yields for many years in some areas. The composition and structure of soil nematode communities were investigated to explore the effect of continuous cropping and soil depths on these communities. Soil samples were collected at two soil depths (0-20 cm and 20-40 cm) from cotton fields with a history of 5, 10, 15 or 20 years of continuous cotton cropping in the Karamay region. The results showed that 36 genera were found. Significant differences in the numbers of total nematodes and trophic groups were observed among continuous cropping times. The highest number of total nematodes was observed at 20-40 cm depth...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Nematode abundance; Continuous planting; Ecological indexes; Trophic groups; Soil depth.
Ano: 2016 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572016000100006
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Seasonal variation in the copepod community structure from a tropical Amazon estuary, Northern Brazil Anais da ABC (AABC)
Magalhães,André; Leite,Natália da R.; Silva,João G.S.; Pereira,Luci C.C.; Costa,Rauquírio M. da.
The main purpose of this study was to investigate the seasonal variation of copepod community structure during the months of July, September and November 2003 (dry season) and January, March and May 2004 (rainy season) in the Curuçá estuary, northern Brazil. Samples were collected during neap tides via gentle 200µm mesh net tows from a small powerboat. Measurements of surface water conductivity were accomplished in situ using an electronic conductivimeter and salinity was later obtained through the transformation of the conductivity values. Salinity varied seasonally from 7.2 ± 0.1 to 39.2 ± 1.8 (mean ± standard deviation) and was influenced mainly by differences in the amount of rainfall between the studied sampling seasons. In total, 30 Copepoda taxa...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Copepod; Salinity; Ecological indexes; Seasonal changes; Brazil.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000200005
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