有哪些信誉好的足球投注网站3 Soil losses due to harvesting of chicory roots and sugar beet an underrated geomorphic process.pdf
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3 Soil losses due to harvesting of chicory roots and sugar beet an underrated geomorphic process
? .Catena 43 2001 35–47
rlocatercatena
Soil losses due to harvesting of chicory roots and
sugar beet: an underrated geomorphic process?
Jean W.A. Poesen
a,b,)
, Gert Verstraeten
a,b
, Ruben Soenens
b
,
Leen Seynaeve
b
a
Fund for Scientific Research, Flanders, Belgium
b
Laboratory for Experimental Geomorphology, K. U. Leu?en, Redingenstraat 16, B-3000 Leu?en, Belgium
Received 15 December 1999; received in revised form 26 April 2000; accepted 26 April 2000
Abstract
Field observations in central Belgium indicate a significant soil degradation process which has
hitherto not been considered in assessments of soil erosion rates: i.e., soil losses due to root crop
? . ? .harvesting SLRH . The objectives of this study were: 1 to assess SLRH for two commonly
? .grown root crops in Belgium, i.e. chicory roots and sugar beet, 2 to investigate some factors
? .controlling the spatial and temporal variation of SLRH, and 3 to evaluate the contribution of this
soil degradation process to overall soil loss in the study area. Soil losses due to harvesting of
witloof chicory roots were assessed by measuring dirt tare from 43 root samples whereas SLRH
for inuline chicory roots and sugar beet were calculated from dirt tare data provided by factories
processing these roots. Mean soil loss was 11.8 ton ha
y1
harvest
y1
for witloof chicory roots, 8.1
ton ha
y1
harvest
y1
for inuline chicory roots and 9.1 ton ha
y1
harvest
y1
for sugar beet. Assuming
that root crops are grown once in 2 years in the study area, mean annual SLRH equals 5.0 ton
y1 y1 ? .ha year 0.33 mmryear . Since these root crops have been grown over a period of at least
200 years in Belgium, this implies a mean soil profile truncation of 66 mm. However, important
spatial and temporal variability in SLRH data was observed, depending on soil texture, soil
moisture at harvest time and harvesting technique. Given the importance of SLRH, it needs to be
incorporated into future assessments of soil degradation processes and sedime
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