Spatial variation of ecological stoichiometry characteristics of topsoil carbon,nitrogen and phosphorus in Hebei Province, China
The study on ecological stoichiometric characteristics of elements in soils is important to revealing mechanisms of the circulation and balance of soil carbon,nitrogen,phosphorus and other elements,and the knowledge of spatial variance of the ecological stoichiometric characteristcs of soil carbon,nitrogen and phosphorus is conducive to soil nutrient management.Spatial distributions of stoichiometric characteristcs of soil C,N and P in the topsoil (0-30cm) and influence factors were systematically analyzed in total Hebei Province.Based on the soil survey data in Hebei Province,the traditional statistics,geostatistics and ordinary kriging interpolation method were used to analyze the spatial variation characteristics of C ∶N ∶P and its influence factors.The results showed that (1) The variation coefficients of SOC,TSN,TSP and their molar ratios were between 0.1-1,which indicated that there existed spatial variability with a moderate degree.In addition,the variation coefficient of C ∶N was smaller,which indicated C ∶N was more stable than N ∶P and C ∶P.(2) Topsoil TSP and C ∶ N has a small range and strong spatial autocorrelation,and SOC,TSN,C ∶ P and N ∶ P has a large range and a moderate degree of spatial autocorrelation.Structural factors were main factors of influencing spatial variation of soil organic carbon,nitrogen,phosphorus content and their molar ratio.From the spatial distribution,soil carbon,nitrogen and phosphorus content and its molar ratio did not show obvious increasing or decreasing trend.SOC,TSN,C ∶P and N ∶P had the same spatial distribution trend.High value region mainly distributed in the north of Hebei and the distribution area was small.The low value distributed widely in Hebei Province.The high value of TSP distributed in North Hebei,and the high value and low value of C ∶N showed patch-shape distribution.(3) C ∶N,C ∶P and N ∶P were affected by soil physical and chemical properties,land use patterns,human disturbance,climate and topography so on.In addition,there were some differences between N ∶P,C ∶P and C ∶N in different climate zones.C ∶N of study region was close to that of and the alpine zone,and there was no significant difference from other climatic zones.C ∶P and N ∶P of study region were close to the temperate zone,and there existed significant differences from other climate zones,which indicated that C ∶N was more stable than C ∶P and N ∶P in different climate zones.
Carbon, nitrogen and phosphorusecological stoichiometrygeostatisticsspatial variation
曹祥会、龙怀玉、周脚根、朱阿兴、刘宏斌、雷秋良、邱卫文
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中国农业科学院农业资源与农业区划研究所,农业部面源污染控制重点实验室,北京100081
中国科学院亚热带农业生态研究所,长沙410125
中科院地理科学与资源研究所,北京100101
4The New Zealand Institute for Plant&Food Research Limited, Private Bag 4704, Christchurch
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