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首页> 外文期刊>The Science of the Total Environment >Land-use change from arable lands to orchards reduced soil erosion and increased nutrient loss in a small catchment
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Land-use change from arable lands to orchards reduced soil erosion and increased nutrient loss in a small catchment

机译：从耕地到果园的土地利用变化减少了小流域的土壤侵蚀并增加了养分流失

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摘要

China has been undergoing dramatic land-use change since the 1980s. More arable lands have been converted to orchards to produce high-value fruits. There is an urgent need to assess the effects of these land-use changes on soil erosion and nutrient loss in the country. In this study, the Revised Universal Soil Loss Equation model, geographical information systems, and, remote sensing data were used to evaluate the effects of land-use change on soil erosion and nutrient loss in the Yujiahe Catchment, where a significant portion of the arable land that grew wheat and maize between 1957 and 1989 was converted to kiwifruit orchards between 1990 and 2013. The total soil erosion from the catchment during 1957-2013 was in line with the sediments in the reservoir at the catchment outlet. Arable land was the major source of soil erosion and its erosion intensity was approximately ten times that of the orchards. The land-use change from arable land to orchard land since 1990 has reduced soil erosion intensity from severe to moderate. The arable land covering 28% of the catchment contributed to 81.3% of total organic matter loss and 80.4% of total nitrogen loss. However, the loss of available phosphorus mainly occurred in the orchards, representing 66.7% of the available phosphorus loss in the catchment. The soil erosion intensity of the arable land was highly sensitive to the land slope. We concluded that land use change from arable land to orchard land reduced soil erosion and increased the risk of nutrient loss from the catchment. (C) 2018 Elsevier B.V. All rights reserved.
机译：自1980年代以来，中国的土地用途一直在发生巨大变化。更多的耕地已转变为果园，以生产高价值的水果。迫切需要评估这些土地利用变化对该国土壤侵蚀和养分流失的影响。在这项研究中，使用修订后的通用土壤流失方程模型，地理信息系统和遥感数据来评估玉家河流域土地利用变化对土壤侵蚀和养分流失的影响。 1957年至1989年间种植小麦和玉米的土地在1990年至2013年间转变为猕猴桃果园。1957-2013年该流域的总土壤侵蚀与该流域出口处水库中的沉积物一致。耕地是土壤侵蚀的主要来源，其侵蚀强度约为果园的十倍。自1990年以来，土地利用方式从耕地转变为果园的土地将土壤侵蚀强度从严重降低为中等。覆盖集水区28％的耕地占有机物总损失的81.3％和氮素总损失的80.4％。然而，速效磷的流失主要发生在果园，占流域速效磷流失的66.7％。耕地的土壤侵蚀强度对坡度高度敏感。我们得出的结论是，从耕地到果园地的土地利用变化减少了土壤侵蚀，增加了流域养分流失的风险。 （C）2018 Elsevier B.V.保留所有权利。

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