关中东部不同土地利用方式下土壤理化性质对比研究

通过对关中东部3种典型土地利用方式（花椒地、农耕地、苹果林地）下土壤理化性质的分析，结果表明：不同土地利用方式下土壤的理化性质有所不同，①黏粒含量是：苹果林地〉农耕地〉花椒地，粉砂是：花椒地〉苹果林地〉农耕地，砂粒是：农耕地〉花椒地〉苹果林地，有机质的含量是：花椒地〉农耕地〉苹果林地。3个剖面总体趋势均表现为随着土层的加深有机质含量减少。②土壤有机质与土壤黏粒、粉粒含量、元素（Cu、Fe、Mn、zn）、水分含量呈极显著或显著正相关关系，与pH值和CaCO3呈极显著负相关关系。元素（Cu、Fe、Mn、zn）与黏粒、有机质含量呈显著正相关，与pH值呈显著负相关。图2，表3，参19。

Comparative Study on Soil Physical and Chemical Properties of Different Land Use Patterns

By analyzing the three typical land use patterns the ash（BMC1） ,crop field（BMC2） ,apple woodland（BMC3） ） of Lou-soil in Heyang region, which lies in the east part of Guanzhong, this paper studied the distribution characteristics and correlation of soil texture, soil water, soil pH, organic matter, CaCO3 and trace elements under different land use patterns. The results show that different land use patterns have different effects on soil physical and chemical properties.①clay： BMC3 〉 BMC2 〉 BMC1 ,fine sand： BMC1〉 BMC3 〉 BMC2,sand： BMC2 〉 BMC1 〉 BMC3, organic matter： BMC1 〉 BMC2 〉 BMC3. The contents of organic matter in all of the three profiles decrease with depth. ②Correlation analysis shows that there are significant positive or positive correlations of soil organic matter to clay,fine sand, the trace elements （Cu,Fe,Mn, Zn） and soil water, and soil pH and CaCO3 are negatively related to organic matter. The trace elements are significantly and positively related to clay and soil organic matter, negatively related to soil pH. The trace elements show significant correlation between each other.