中文摘要：

【目的】研究丹江中游典型小流域土壤有效锌的空间分布特征,为流域养分资源管理和治理措施的优化提供科学依据。【方法】2011-12,利用网格取样和典型样地取样相结合的方法,在陕西丹江中游鹦鹉沟小流域分3层（0～10,10～20,20～40cm）采集185个样点的土样,测定其有效锌含量,采用地统计分析和Kriging插值的方法,对鹦鹉沟小流域土壤有效锌含量的空间分布特征进行研究,并分析了土地利用和地形对有效锌分布的影响。【结果】土壤有效锌含量随土层深度的增加而降低,不同土地利用类型下土壤有效锌含量平均值表现为林地〉农地〉草地。3个土层土壤有效锌含量与海拔呈现出显著（P〈0.05）或极显著负相关性（P〈0.01）,农地土壤有效锌含量与坡度、坡向和海拔均呈现出极显著负相关性（P〈0.01）。研究区3个土层下,模拟0～10和20～40cm土层有效锌含量的最优模型为线性模型,模拟10～20cm土层有效锌含量的最优模型为指数模型。Kriging插值结果表明,研究区土壤有效锌的空间分布呈带状格局,呈东部低西部高的变化趋势。【结论】影响研究区土壤有效锌含量分布的主要因素是土地利用类型和海拔;研究区大部分土壤有效锌含量处于较低水平。

英文摘要：

[Objective] The spatial distribution of soil available zinc （SAZ） was studied in a typical small watershed of the middle reaches of Danjiang River to provide scientific basis for nutrient resource management and control measures of watershed. [Method] Combined with grid and typical spot samples, 185 sites were collected with three soil layers （0--10 cm （A1）,10--20 cm （A2）,and 20--40 cm （A3）） at the Yingwugou watershed of Danjiang River in Shanxi in 2011-12. The spatial distribution of SAZ was studied by geostatistical analysis and Kriging interpolation, and the impact of land use and terrain condi- tions was analyzed. [Result] The content of SAZ decreased with the increase of soil depth. The average SAZ contents of different land use types were in the order of woodland〉farmland〉grassland. There was extremely significant （P〈0.01） or significant （P〈0.05） correlation between the SAZ content and eleva-tion. SAZ in cropland was significantly correlated with slope,aspect and elevation （P〈0.01）. In three soil depths,the best fitted model was linear model indicating moderate spatial dependence in A1 and A3. The best fitted model in A2 was expoential model indicating moderate spatial dependence. The spatial distribu- tion of SAZ was zonal pattern using Kriging interpolation,and SAZ content was lower in the eastern part than in western part. [Conclusion] The SAZ was mainly affected by the land use and elevation, and the SAZ content was at a low level in the study area.