【摘要】 [目的 ]探究川西米亚罗亚高山原始暗针叶林土壤微量元素的空间异质性,为评价川西亚高山林区土壤质量、保护区域生态环境和研究生物多样性维持机制提供科学依据。[方法 ]在四川米亚罗省级自然保护区亚高山原始暗针叶林9.6 hm2(400 m×240 m)动态样地,采用野外布点采样、实验室测定、经典统计学和地统计学分析相结合的方法,分析动态样地表层0～10 cm土壤微量元素铁(Fe)、锰(Mn)、铜(Cu)、锌(Zn)的空间异质性及其与土壤pH、有机碳(SOC)、全氮(TN)、全磷(TP)、全钾(TK)之间的相关性。[结果 ](1)米亚罗亚高山原始暗针叶林动态样地的土壤Fe含量均值为17.22 g·kg-1,Mn、Cu、Zn含量均值分别为423.09、4.33、47.91 mg·kg-1;(2)土壤Fe、Mn、Cu、Zn含量的高值主要呈斑块状分布在动态样地东侧高海拔区域,土壤Zn的空间分布较简单,连续性较强;(3)土壤微量元素含量的变异系数为29.76%～63.84%,其中,Fe含量的变异系数为29.76%,Mn含量的变异系数为63.84%。土壤微量元素含量的块基比值范围为0.08～0.50,土壤Mn、Cu呈现强烈的空间自相关性,土壤Fe、Zn呈现中等程度的空间自相关性;(4)除了土壤Cu与pH、土壤Zn与SOC、土壤Zn与TK之间的相关性不显著(P> 0.05)外,其它17对土壤性质之间均呈显著(P <0.05)或极显著(P <0.01)相关。[结论 ]川西米亚罗亚高山原始暗针叶林土壤微量元素Fe、Mn含量丰富,Cu、Zn含量较低。土壤微量元素Fe、Mn、Cu、Zn的空间分布表现出明显的空间自相关特征。土壤微量元素Fe、Mn、Cu、Zn与土壤pH、SOC、TN、TP、TK之间呈较为普遍的显著相关。更多还原

【Abstract】 [Objective] To study the spatial heterogeneity of soil trace elements in Miyaluo subalpine primary dark coniferous forest of western Sichuan so as to provide scientific basis for soil quality evaluation, the protection of regional ecological environment and the research on biodiversity co-existence mechanism of the subalpine forest in Western Sichuan. [Method] A subalpine primary dark coniferous forest dynamics plot(400 m × 240 m) was established in Miyaluo of western Sichuan. By combining field sampling, laboratory measurement, classical statistics and geostatistical analysis, the spatial heterogeneity of 0～10 cm surface soil trace elements were analyzed, including Iron(Fe), Manganese(Mn), Copper(Cu), Zinc(Zn) and their correlations with soil pH, soil organic carbon(SOC), total nitrogen(TN) total phosphorus(TP) and total potassium(TK). [Result](1) The mean content of Fe was 17.22 g·kg-1,and the mean content of Mn, Cu, and Zn were 423.09, 4.33 and 47.91 mg·kg-1 respectively;(2) The high values of soil Fe, Mn, Cu and Zn contents appeared mainly in the high altitude area of the dynamics plot eastern portion and with patch shape, the spatial distribution characteristics of soil Zn was relatively simple with strong continuity;(3) The coefficient of variance(CV) of all soil trace elements content ranged from 29.76%-63.84% and the CVs of soil Fe and Mn were 29.76% and 63.84%. The Nugget/Sill ratio of soil trace element content ranged from 0.08 to0.50. Mn and Cu showed a strong spatial autocorrelation, whereas Fe and Zn showed a moderate spatial autocorrelation;(4) In addition to the Cu and pH, Zn and SOC, Zn and TK, the other 17 pairs of soil properties had a significant(P < 0.05) or extremely significant(P < 0.01)correlation. [Conclusion] The content of trace elements Fe and Mn in the soil of Miyaluo subalpine primary dark coniferous forest in western Sichuan are high, but the content of Cu and Zn are low. The spatial distribution characteristics of soil Fe, Mn, Cu, Zn content show obvious spatial autocorrelation. There is a universal correlation between soil Fe, Mn, Cu, Zn content and soil pH, SOC, TN, TP, and TK.更多还原