基于地区和土类的吉林省农田耕层土壤氮素时空变化特征
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S158.5;S155.2

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Temporal and Spatial Variability of Nitrogen Status in Cropland Topsoil in Jilin Province Based on Regions and Soil Types
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    摘要:

    为明确吉林省农田耕层土壤氮素营养的时空变化特征,基于2005—2013年间测土配方施肥项目测定的土壤全氮和碱解氮数据,分析吉林省不同地区、土类农田耕层土壤氮素养分的空间变异特征,并与第2次土壤普查数据对比,探讨土壤氮素养分的时间变化趋势。结果表明,目前吉林省农田耕层土壤全氮含量为0.4~3.9 g/kg,平均为(1.62±0.60)g/kg,碱解氮含量为15~360 mg/kg,平均为(145.0±59.5)mg/kg。不同土类之间全氮和碱解氮含量的高低顺序一致,均以暗棕壤最高,平均分别为(2.02±0.57)g/kg和(190.2±72.80)mg/kg,其后依次为白浆土、水稻土、黑土、草甸土、黑钙土和风沙土;空间变异方面,吉林省农田耕层土壤氮素营养水平呈自东向西逐渐下降的分布特征,全氮和碱解氮含量在县域尺度上存在显著正相关关系;时间变化方面,吉林省农田耕层土壤全氮和碱解氮含量相比第2次土壤普查均呈明显上升趋势,中部地区变化最显著,西部地区变化相对较小。不同土类之间,黑土、黑钙土、草甸土和风沙土呈上升趋势,而暗棕壤、白浆土和水稻土出现下降,其中以风沙土的增加和暗棕壤的下降最明显。综上所述,吉林省农田耕层土壤氮素营养状况在空间上存在显著差异,时间上也发生了巨大变化。建议中部粮食主产区应严格控制作物施氮量以提高氮肥效率,降低环境风险,东、西部地区应因地制宜优化氮肥管理以提升地力,实现增产增效。

    Abstract:

    The temporal and spatial variability of topsoil nitrogen (N) status across the different regions and soil types in Jilin province was evaluated by using traditional statistic method combines with GIS technique, based on the data of topsoil total N and alkali-hydrolyzable N in soil testing and recommended fertilization program during 2005—2013. Moreover, the historic changing trend of topsoil N status was also discussed by compared with the data obtained during the second national soil survey. Results showed that the total N content in topsoil ranged between 0.4 and 3.9 g/kg with a mean of(1.62±0.60)g/kg, and the alkali-hydrolyzable N content ranged between 15 and 360 mg/kg with a mean of(145.0±59.5)mg/kg in the present Jilin province. The total N and alkali-hydrolyzable N contents in topsoil showed same oeders among the various soil types, these were highest in dark brown soil with the values of(2.02±0.57)g/kg and(190.2±72.8)mg/kg, and followed by albic soil, paddy soil, black soil, meadow soil, chernozem, and aeolian sandy soil. In view of the province as a whole, the spatial distribution of N status in topsoil was characterized by being high in the east and low in the west, and a positive and significant correlation was shown between the total N content and the alkali-hydrolyzable N content in the county scale. Compared with the second soil survey, the total N and the alkali-hydrolyzable N contents in topsoil showed obviously ascending trends in the scale of whole Jilin province, the change magnitude of topsoil N status were mostly significant in the central region but relatively low in the west region. The great discrepancies were also observed in the change trends of topsoil N status among various soil types. Of which, black soil, chernozem, meadow soil, and aeolian sandy soil showed increasing trends, while dark brown soil, albic soil, and paddy soil showed decreasing trends. Compared with other soil types, the increasing magnitude was significant in aeolian sandy soil, and the decreasing magnitude was significant in dark brown soil. In conclusion, there were enormous differences in spatial distribution and historic change in the N status of cropland topsoil in Jilin province. Based on the temporal and spatial characteristics of topsoil N status between regions and soil types, we suggested that N fertilizer rate in crop production should be strictly controlled in the major grain producing areas of the central region to improve N use efficiency and reduce environmental risk, and crop N fertilizer management should be improved according to local conditions in the east and west regions to enhance soil fertility and to achieve high yield and high efficiency.

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陈敏旺, 王缘怡, 陈 健, 王 寅, 高 强, 焉 莉, 冯国忠.基于地区和土类的吉林省农田耕层土壤氮素时空变化特征[J].水土保持学报,2018,32(2):237~245

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  • 在线发布日期: 2018-04-18
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