基于县域尺度的稻田土壤碱解氮空间异质性研究

doi:10.19741/j.issn.1673-4831.2019.0412

摘要/Abstract

摘要： 掌握土壤氮素的空间分异特征是实现养分优化管理的重要基础。以江苏省扬中市为研究区，基于田间采样的99个土壤碱解氮样本数据，运用地统计学与缓冲区分析方法，研究县域稻田土壤碱解氮的空间变异特征及其影响因素。结果表明，研究区土壤碱解氮平均含量为114.30 mg·kg^-1，处于较丰富水平。半方差分析结果显示，土壤碱解氮空间分布具有中等程度的空间自相关性。空间插值结果显示，扬中市土壤碱解氮空间分布总体上呈斑块状，大致表现为中部高、两端低，高值区主要位于研究区中部3镇，在工业区与养殖基地附近均出现局部高值区。影响因素分析表明，城镇化、土壤质地、产业分布、农户经营等因子对研究区土壤碱解氮空间分布均具有较大影响。距离养殖合作社1 km以内区域的土壤碱解氮易于积累，工厂、企业对周边600 m范围内的土壤碱解氮含量影响显著（P<0.05）。

关键词: 碱解氮, 地统计学, 空间异质性, 扬中市

Abstract: A good understanding of the spatial variability of nitrogen in soil is important for the best management of soil nutrients. For this study, Yangzhong City in Jiangsu Province, China, was chosen as the study area. The data were taken from the soil of 99 plow layer samples collected from paddy fields in Yangzhong. The spatial variation characteristics of alkali-hydrolyzable nitrogen (AN) and what affected that variation at a county scale were studied using geostatistics analysis methods and buffer analysis. The results show that:(1) The average content of soil AN in the study area was 114.30 mg·kg^-1, which was at a rich level. (2) Semivariance analysis showed that the soil AN was moderately spatially auto-correlated. (3) Spatial interpolation results showed that the spatial distribution of soil AN in Yangzhong was generally in convex patches; high in the middle and low at sides of the areas. The high-value areas were located mainly in the middle three towns of the study area, and local extreme-value areas appeared near polluted industrial areas and breeding bases. (4) Analysis of the affecting factors indicated that urbanization, soil texture, industrial distribution, and farmer management had a great effect on the spatial distribution of soil AN in the study area. The soil was prone to accumulate alkali-hydrolyzable nitrogen within 1 km of the breeding cooperatives, and the industrial enterprises had significant effects on soil alkaline nitrogen in a range of 600 m (P<0.05).

Key words: soil alkali-hydrolyzable nitrogen, geostatistics, spatial heterogeneity, Yangzhong City

中图分类号:

X825

黄仕辉, 方斌, 李欣, 何莎莎. 基于县域尺度的稻田土壤碱解氮空间异质性研究[J]. 生态与农村环境学报, 2020, 36(2): 179-185.

HUANG Shi-hui, FANG Bin, LI Xin, HE Sha-sha. Study on Spatial Heterogeneity of Alkali-Hydrolyzable Nitrogen in Paddy Fields at the County Scale[J]. Journal of Ecology and Rural Environment, 2020, 36(2): 179-185.

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