集约化农区土地利用变化对土壤养分的影响——以河北省曲周县为例

The Influence of Land Use Change on Soil Fertility in Intensive Agricultural Region:A Case Study of Quzhou County,Hebei

以河北省曲周县为集约化农区的分析样区,通过对1980年、1999年土地利用类型变化和2期不同用地类型的土壤养分变化进行分析.结果表明:曲周县1980～1999年之间的土地利用类型以水浇地、旱地、菜地、园地、林地等农业用地类型为主,1980年农业用地类型占土地总面积的77.47%,1999年的农业利用类型占土地总面积的77.43%;但是土地利用类型也存在着转化,转化的顺序为荒草地向旱地、水浇地、菜地方向转化,旱地向水浇地、菜地方向转化;1980年土壤养分含量在不同用地类型间的变化顺序为水浇地>旱地>荒草地,差异幅度在2%～18%之间,1999年土壤养分含量在不同用地类型间的变化顺序为菜地>水浇地>旱地,差异幅度在18%～690%之间;2期对比分析表明,土壤养分含量除速效钾外不仅在相同用地类型之间增加幅度大,而且在转化后地用地类型之间也存在明显差异;土壤有机质、全氮、速效磷含量在不同土地利用类型中的变化顺序为菜地>水浇地>旱地>荒草地,速效钾含量变化的顺序为旱地>荒草地>菜地>水浇地.

Land use change is the results of interactions between physical factors and human activities, and it also leads to changes of soil nutrient. Taking Quzhou county of Hebei province as a case study, this paper analyzed the changes of land use types and the corresponding changes of soil fertilities from 1980 to 1999. The results are as follows: The convert order of land use type is from grassland to farmland, from farmland to irrigable land, from irrigable land to vegetable land; the change extent of organic matter, total-N, and available-P content is different among different land use types in 1980 and 1999, the order of content change in different land use types is irrigable land > farmland > grassland, but the range is from 2% to 18%; the order of content change in different land use types in 1999 is vegetable land > irrigable land > farmland, but the range is 18%-690%; and the change extent of organic matter, total-N and available-P content is different among different land use types from 1980 to 1999, the order of content change in different land use types is vegetable land > irrigable land > farmland > grassland.