Possible causes of the vegetation shift include declining rainfall, growing human population and decreasing soil fertility.
植被转移的可能原因包括降雨减少，人口增长及土壤肥力的下降。
Mostly because of water and soil loss the soil fertility became declining from watershed to the edge of gully, and the area was enlarging from gully valley to riverbed.
从分水岭到沟缘，土壤肥力呈衰减趋势，沟谷地向沟床呈增大的变化趋势，其主要是水土流失的结果。
Mostly because of water and soil loss the soil fertility became declining from watershed to the edge of gully, and the area was enlarging from gully valley to riverbed.
从分水岭到沟缘，土壤肥力呈衰减趋势，沟谷地向沟床呈增大的变化趋势，其主要是水土流失的结果。
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