江西省耕地土壤碳氮比空间变异特征及其影响因素

发布时间：2018-05-26 21:23

本文选题：江西省 + 土壤碳氮比　；参考：《环境科学》2017年09期

【摘要】：以江西省2012年测土配方施肥项目采集的16 582个耕地表层(0~20 cm)土壤样点数据,运用普通克里格和回归分析方法,对江西省土壤碳氮比(C/N)空间变异特征及其影响因素进行分析.结果表明江西省土壤C/N在2.98~52.67之间,平均值为11.72,变异系数为25.17%,呈中等变异性.经半方差分析,土壤C/N的块金效应为88.44%,其空间变异受结构性和随机性因素共同影响,但随机性因素的影响更大.土壤C/N空间分布较为平滑,高值区主要分布在九江市彭泽县、萍乡市上栗县和抚州市乐安县.地形因子、耕地利用方式、成土母质、土壤类型和氮肥施用量对土壤C/N空间变异影响均显著(P0.05),但影响程度不一.地形因子可解释0.3%的土壤C/N空间变异,耕地利用方式的独立解释能力为1.4%,成土母质的独立解释能力为2.4%,土类、亚类和土属的独立解释能力分别为2.7%、3.6%、5.5%.氮肥施用量对土壤C/N空间变异的独立解释能力最高,为33.4%,是引起江西省土壤C/N空间变异最主要的因素.
[Abstract]:Based on the data of 16 582 topsoil samples collected from Jiangxi Province in 2012, the spatial variation characteristics of soil C / N ratio (C / N) and its influencing factors were analyzed by means of ordinary Kriging and regression analysis. The results showed that the soil C / N of Jiangxi Province was between 2.98 and 52.67, the average value was 11.72, the coefficient of variation was 25.177.There was a moderate variability. The semivariance analysis showed that the block gold effect of soil C / N was 88.444.Its spatial variation was influenced by both structural and random factors, but the influence of random factors was greater. The spatial distribution of soil C / N is smooth, and the high value area is mainly located in Pengze County of Jiujiang City, Shangli County of Pingxiang City and Le'an County of Fuzhou City. Topographic factors, cultivated land use patterns, soil-forming materials, soil types and nitrogen application rates had significant effects on soil C / N spatial variability, but to varying degrees. Topographic factors can explain 0.3% of soil C / N spatial variation, the independent interpretation ability of cultivated land use mode is 1.4, the independent interpretation ability of soil parent material is 2.4, and the independent interpretation ability of soil type, subclass and genus is 2.73.6and 5.5. Nitrogen application rate had the highest independent interpretation ability to soil C / N spatial variation (33.4%), which was the main factor that caused soil C / N spatial variation in Jiangxi Province.
【作者单位】：江西农业大学国土资源与环境学院;江西省鄱阳湖流域农业资源与生态重点实验室;
【基金】：国家自然科学基金项目(41361049) 江西省自然科学基金项目(20122BAB204012) 江西省赣鄱英才“555”领军人才项目(201295)
【分类号】：S153.6

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