1. 甘肃农业大学资源与环境学院,兰州,730070
2. 中国科学院西北生态环境资源研究院沙坡头沙漠试验研究站,兰州,730000
[ "任建新(1996-),男,甘肃武威人,硕士研究生,主要从事农业资源利用研究。E-mail:2296125896@qq.com" ]
纸质出版:2020
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任建新, 唐亮, 何明珠, 等. 陇西县土壤氮储量的空间分布特征及其影响因素研究[J]. 水土保持学报, 2020,34(6):318-324.
REN Jianxin, TANG Liang, HE Mingzhu, et al. Spatial Distribution Characteristics and Influencing Factors of Soil Nitrogen Reserves in Longxi County[J]. 2020, 34(6): 318-324.
任建新, 唐亮, 何明珠, 等. 陇西县土壤氮储量的空间分布特征及其影响因素研究[J]. 水土保持学报, 2020,34(6):318-324. DOI: 10.13870/j.cnki.stbcxb.2020.06.044.
REN Jianxin, TANG Liang, HE Mingzhu, et al. Spatial Distribution Characteristics and Influencing Factors of Soil Nitrogen Reserves in Longxi County[J]. 2020, 34(6): 318-324. DOI: 10.13870/j.cnki.stbcxb.2020.06.044.
以陇西县600份土壤全氮含量数据为基础,应用地统计学研究陇西县土壤氮素的空间分布特征并计算了该区域的氮储量,采用相关性分析、主成分分析等方法探讨了影响全氮空间分布的影响因素。结果表明,陇西县土壤全氮含量为(0.734±0.306) g/kg,变异系数属于中等程度变异;氮密度平均值为0.091 kg/m2,氮储量为7.6×106 kg,其中0—10,10—30,30—50 cm土层氮储量分别占到0—50 cm土层氮储量的35.97%,7.06%,56.97%。陇西县土壤全氮含量及氮储量空间分布相似,主要呈斑块状分布,高值区主要集中在研究区南部的首阳镇、和平乡,低值区主要集中在研究区东部的权家湾乡;从垂直分布来看,土壤全氮含量随着土层深度的增加而减小。土壤表层10 cm的全氮含量与纬度、高程、坡向、坡度、降雨、地温、气温呈极显著或显著相关,但随着土层深度的增加,土壤全氮含量与环境因子相关性逐渐减弱;主成分分析表明,经度、纬度、降雨、地温、气温、相对湿度、蒸发量是影响土壤全氮含量的重要环境因子;通过聚类分析可以把陇西县土壤分成5类,除第Ⅳ类土壤全氮含量极显著高于其他4类土壤外,其余4类土壤全氮含量均无极显著差异,土壤全氮含量属于第五类标准的土壤占到了全部样地的70.35%。
Based on the total nitrogen content data of 600 samples in Longxi County
the spatial distribution characteristics of soil nitrogen in Longxi County were studied by geostatistics and the nitrogen reserves were calculated. The results showed that the total nitrogen content in Longxi County was (0.734±0.306) g/kg
and the coefficient of variation was moderate. The average nitrogen density was 0.091 kg/m2
and the nitrogen reserves were 7.6×106 kg. The nitrogen reserves in the 0—10
10—30
and 30—50 cm soil layers accounted for 35.97%
7.06%
and 56.97% of the nitrogen reserves in the 0—50 cm soil layer respectively. The spatial distribution of total nitrogen content and nitrogen reserves in Longxi County was similar
mainly distributed in patches. The high-value area was mainly concentrated in Shouyang town and Heping Township in the south of the study area
while the low-value area was mainly concentrated in Guanjiawan Township in the east of the study area. From the vertical distribution
the total nitrogen content of soil decreased with the increase of soil depth. The total nitrogen content of 10 cm in the soil surface was extremely significantly or significantly correlated with latitude
elevation
slope direction
slope
rainfall
ground temperature
and air temperature. Principal component analysis showed that longitude
latitude
rainfall
ground temperature
air temperature
relative humidity
and evaporation could be considered as important environmental factors affecting the total nitrogen content of soil. Through clustering analysis can divide the Longxi County soil into five types. The total nitrogen content of class IV soil was significantly higher than the other four types of soil
and no extreme significant difference was observed among the rest four types of soil total nitrogen content. Soils contain total nitrogen content belong to the fifth class standard accounted for 70.35% of the total sample area.
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