宁夏盐池沙地3种植物群落土壤表层养分的空间异质性
Soil Nutrient Space Heterogeneity in Yanchi of Ningxia Hui Autonomous Region, China
Received date: 2012-04-27
Revised date: 2012-06-27
Online published: 2012-06-27
采用经典统计学和地统计学方法,通过半变异函数及其模型、克里格局部插值估计、空间分布图及分形维数等对宁夏盐池沙地3种植物群落(牛枝子、牛枝子-黑沙蒿、黑沙蒿)土壤表层养分的空间异质性进行了研究。结果表明:0~5 cm土壤有机质、全氮、速效磷含量的空间自相关尺度分别是67 m、519 m、143 m;结构方差比分别为0.558、0.882、0.514,说明结构性因素和随机性因素在0~5 cm土壤有机质和速效磷的空间分布中共同发挥作用。全氮表现出较强空间自相关性,在空间分布上具有明显的结构特征,表明结构性因素在其空间总变异中发挥主导作用。空间格局图反映出0~5 cm土壤有机质、全氮含量表现为牛枝子群落较高,经牛枝子-黑沙蒿群落,含量逐渐减少,至黑沙蒿群落含量又有所增加;0~5 cm土壤速效磷含量表现为牛枝子群落和黑沙蒿群落含量较高而牛枝子-黑沙蒿群落含量较低的趋势。反映出研究区从牛枝子群落经牛枝子-黑沙蒿群落至黑沙蒿群落,植被从以草原种为主的群落,逐渐灌木化,植物群落结构组成由复杂到简单的过程,深刻影响了土壤养分的分布格局,导致了土壤“肥力岛”的形成和发展,又反作用引起研究区植物群落的进一步灌丛化,并逐步向沙漠化的方向发展的趋势。
刘丽丹 , 谢应忠 , 邱开阳 , 时项峰 . 宁夏盐池沙地3种植物群落土壤表层养分的空间异质性[J]. 中国沙漠, 2013 , 33(3) : 782 -787 . DOI: 10.7522/j.issn.1000-694X.2013.00090
Using classical statistical and geo-statistical methods such as semivariogram, Kriging interpolation, and spatial distribution maps, we studied the soil nutrient space heterogeneity of Lespedeza potaninii, Lespedeza potaninii-Artemisia ordosica, and Artemisia ordosica community in Yanchi of Ningxia Hui Autonomous Region, which is in arid and semiarid area of China. The results showed that: The autocorrelation scale of soil organic matter, total nitrogen, rapidly-available phosphorus were 67 m, 519 m and 143 m, respectively; Structure variance (C/(Co+C)) were 0.558, 0.882 and 0.514 respectively. The space heterogeneity of total nitrogen content in 0-5 cm soil was mainly influenced by the structural factors, while the organic matter and the available phosphorus contents were influenced by random factors and structural factors. The spatial distribution maps indicated that the organic matter and total nitrogen content in 0-5 cm soil were both the highest in the Lespedeza potaninii community, tapered off in the Lespedeza potaninii-Artemisia ordosica community, and then increased in the Artemisia ordosica community, whereas the available phosphorus content was the highest in the Lespedeza potaninii community and the lowest in the Artemisia ordosica community. In conclusion, the gradual degeneration of the grassland vegetation and the soil desertification had significant influence on the surface soil nutrient distribution pattern when the plant communities converted from Lespedeza potaninii to Artemisia ordosica
Key words： soil nutrient; space heterogeneity; Yanchi County
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