农业耕作土壤与人工经济林地土壤磁化率和质地特征对比

通过对关中东北部地区人工经济林地土壤（JJC2）和农耕地土壤（JJC1）磁化率与粒度分布特征的研究和对比．试图阐明土地利用方式对土壤发育过程的影响。结果表明：农业耕作土壤和人工林地土壤的磁性特征有着明显的差异；农耕地长期的耕作、污灌以及C4作物玉米的生长与秸秆焚烧等农业管理方式可以增大土壤风化成土作用强度，增加土壤的磁化率；土地利用方式对土壤粒度分布的影响显著，表层0～40cm，1年生作物农田土壤〈2μm和50μm～2000μm颗粒含量均高于人类活动干扰小的多年生园林土壤的含量；整个剖面耕地土壤和人工林地土壤〈2μm和50μm～2000μm颗粒含量变化差异均大于2μm～50μm颗粒变化。图1，表2。参14。

Comparative Research on Soil Granularity and Magnetic Susceptibility of the Cultivated Soil and Anthropogenic Forest Soil

To compare soil magnetic susceptibility and granularity distribution features of anthropogenic economic woodland soil （JJC2）and cultivated soil（JJC1） in Guanzhong＇s northeast areas,this paper tries to illustrate the infuluences of land use patterns on soil-forming process.The results are as follows： significant differences exist between magnetic characteristics of cultivated soil and anthropogenic woodland soil; agricultural management methods including agricultural land＇s tillage, sewage irrigation and corn＇s growth of CA crop and straw burning can increase the intensity of weathering, enhance the content of ferromagnetic minerals in soil; different land use patterns affect significantly the distribution of soil granularity, in 0 -40cm, the content of 〈 2μm and 50μm- 2 000μm particle in cultivated soil of annual crops is higher than perennial woodland soil that interfered little by human activities;The content of 〈 2μm and 50μm - 2 000μm changed more significant than 2μm - 50μm in the whole soil profile of the cultivated soil and anthropogenic woodland soil.