丹江中游典型小流域土壤有效锌的空间分布特征

发布时间：2018-10-24 17:33

【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(P0.05)或极显著负相关性(P0.01),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(P0.01)。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。
[Abstract]:[objective] to study the spatial distribution characteristics of soil available zinc in typical small watershed in the middle reaches of Danjiang River, so as to provide scientific basis for the optimization of nutrient resources management and management measures. [methods] 2011-12, the method of combining grid sampling with typical sample sampling was used. The soil samples from 185 soil samples were collected from three layers in the parakou watershed of the middle reaches of Danjiang River, Shaanxi Province. The available zinc content was measured. The spatial distribution characteristics of available zinc content in the soil were studied by means of geostatistical analysis and Kriging interpolation. The effects of land use and topography on the distribution of available zinc were analyzed. [results] the available zinc content of soil decreased with the increase of soil depth. The average value of soil available zinc content in different land use types was forest land grassland, the soil available zinc content in three soil layers showed significant (P0.05) or extremely significant negative correlation (P0.01) with altitude, and the soil available zinc content and slope degree of farmland were significantly (P0.05) or extremely negative correlation (P0.01). There was a very significant negative correlation between slope direction and elevation (P0.01). Under three soil layers in the study area, the optimal model for simulating the effective zinc content of 0 10 and 20~40cm soils is a linear model, and the optimal model for simulating the effective zinc content in the 10~20cm soil layer is an exponential model. The Kriging interpolation results show that, The spatial distribution of soil available zinc in the study area showed a zonal pattern, with a high variation trend in the east and west of the region. [conclusion] the main factors affecting the distribution of soil available zinc in the study area were land use type and altitude. The content of available zinc in most soils in the study area was at a low level.
【作者单位】：西安理工大学西北旱区生态水利工程国家重点实验室培育基地;陕西省咸阳市种苗站;
【基金】：国家科技支撑计划项目(2011BAD31B01) 国家自然科学基金项目(41401316) 水利部公益性行业科研专项(201201084) 陕西省自然科学基础研究计划项目(2014JQ5175)
【分类号】：S153.6

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