水保所知识产出(1956---)知识库

Agricultural erosion leads to degradation of hydraulic properties and further affects agroecosystem hydrological
cycling. How such properties respond to intensities of erosion remain unclear, hindering the understanding of the
mechanisms behind agroecosystem hydrological cycling. Herein, we investigated the variations in soil hydraulic
and physical properties at different slope positions that subjected to various intensities of soil erosion (non-
erosion, light erosion, moderate erosion, and heavy erosion) and deposition positions along a maize field in the
agricultural region. The average erosion moduli were <200, 700, 1800 and 4200 t km −2 a −1 at the non-erosion,
light erosion, moderate erosion, and heavy erosion sites, respectively. The measured soil properties included soil
organic matter, bulk density, saturated hydraulic conductivity (K s ), soil water content, capillary moisture ca-
pacity, field capacity, parameters of the soil water retention curve and water-stable aggregates. Our results
showed that organic matter, K s , soil water content, capillary moisture capacity, field capacity and most pa-
rameters of soil water retention curve (i.e., θ r , θ s and n) decreased, but bulk density increased with soil depth at
the eroding and non-erosion sites. Soil erosion decreased organic matter, K s , soil water content, capillary
moisture capacity, field capacity and the ability of soils to retain water but increased soil bulk density. The
proportions of aggregates were not affected by soil depth or its interaction with soil erosion, while soil erosion
decreased microaggregates but increased macroaggregates. Overall, in this study, agricultural erosion resulted in
the degradation of soil hydraulic and physical properties, which may increase the risk of the agricultural
ecosystem to suffer drought.