黄土高原主要土壤锌有效性及其影响因素  

Available Zinc Content and Related Properties of Main Soil in the Loess Plateau

作　　者：刘合满[1] 张兴昌[1] 苏少华[1] 

机构地区：[1]西北农林科技大学资源环境学院,陕西杨凌712100

出　　处：《农业环境科学学报》2008年第3期898-902,共5页Journal of Agro-Environment Science

基　　金：教育部科研创新团队支持计划;国家科技支撑计划(2006BAD09B06)

摘　　要：通过测定黄土高原不同区域、不同类型土壤全锌和有效锌含量,研究了黄土高原土壤锌含量及影响有效锌的因素。结果表明,供试土壤全锌主要分布在50～100mg·kg-1之间,有效锌含量较低,其中20.69%在临界值(0.5mg·kg-1)之下,37.93%为低(0.5～1.0mg·kg-1)水平。用直线、幂函数和指数函数回归方程对影响有效锌的主要土壤因素进行回归拟合。发现土壤有效锌与全锌、全氮、全磷、有机质呈显著正相关,与土壤pH值呈显著负相关;幂函数可以较好地拟合有效锌与土壤全氮、有机质的相关关系,有效锌与全锌、全磷、pH值宜用指数函数表示其相关性。通径分析表明土壤性质对有效锌的直接作用系数大小次序为全氮>全锌>pH>全磷,土壤全氮对锌有效性的直接作用最明显。Total soil zinc, available zinc and other soil properties were measured to determine their distribution and to identify factors affecting their variability in different regions of the Loess Plateau. Results showed that total soil zinc was mostly within the range 50-100 mg·kg^-1. For available zinc, 20.7% of the soil samples was lower than the critical value （0.5 mg·kg^-1） and 37.9% beneath the low level （0.5-1mg·kg^-1）. Power functions, linear and exponential regression equations were established to study the relationship between available zinc with other soil properties. For the Loess Plateau soils, soil available zinc was positively correlated with total zinc, total nitrogen, total phosphorus, and organic matter. A significant negative correlation existed with soil pH. Power functions fitted better between available zinc and total nitrogen or soil organic matter. The regression equations were lgY=0.143 3＋0.677 9 lgX（r=0.694 8）and lgY=0.965 6＋0.795 9 lgX（r=0.774 5）, respectively. The relationships between soil available zinc and total zinc, total phosphorus and pH could be expressed by exponential functions. The regression equations were lgY=-1.006 1＋0.012 6X（r=0.654 9）, lgY=-0.534 8＋0.086X（r=0.480 7）, lgY=5.021 4-0.607 3X （r=-0.583 4）, respectively. The results of path analysis indicated that the direct acting coefficient of soil chemical and physical factors on soil available zinc was in the following order：total nitrogen〉total zinc〉pH〉total phosphorus. N-direct path coefficient was biggest and had the greatest direct effect on the soil available zinc.

关 键 词：回归分析 有效锌 有机质 土壤PH 全氮 全磷 

分 类 号：X53[环境科学与工程—环境工程]