土地利用方式对绿洲型城市土壤肥力的影响——以甘肃省张掖市为例

根据张掖市土地利用类型,采集未利用土地、林地、耕地和草地表层土壤样品182个,分析了有机质、全氮、全磷、全钾等土壤养分指标,以研究土地利用方式对土壤肥力质量的影响.结果表明:张掖市土壤全磷含量为耕地>草地>未利用土地>林地;土壤全钾含量为耕地>未利用土地>林地>草地;土壤有机质与全氮含量均为草地>林地>耕地>未利用土地;张掖市土壤全氮含量与有机质含量呈极显著的线性正相关关系(P<0.01),土壤全磷及全钾含量与有机质含量相关不显著.

Effects of land use on soil fertility in oasis-type city——A case study in Zhangye City, Gansu Province

According to the land use types in Zhangye City,182 topsoil samples from unused land,forest land,cultivated land and grass land were collected,and the contents of soil organic matter,total N,total P and total K were determined to analyze effects of different land use of the oasis-type city on its soil fertility quality.The results showed that the content of total P was in order of cultivated land >grassland > unused land > forestland,content of total K was in order of cultivated land > unused land > forest land > grassland.The contents of organic matter and total N were both taking the order of grassland > forest land > cultivated land > unused land.The results indicated that the correlation between soil organic matter and total N was significantly positive(P<0.01),while the correlation between organic matter and total P or total K were both not significant.