关帝山云杉次生林土壤的空间异质性及其与地形相关性

发布时间：2018-05-28 22:53

本文选题：空间异质性 + 地形因子　；参考：《中国水土保持科学》2017年04期

【摘要】：为揭示森林土壤空间变异特征及其变异机制,参照CTFS样地土壤采样方案,在关帝山4 hm~2云杉次生林样地199个采样点进行土壤取样和测定,运用经典统计方法分析寒温性云杉林土壤pH值、有效氮、有效磷、有效钾和有机质的水平和垂直空间分布特征,应用地统计学和Arc GIS插值的方法,重点分析了0~10 cm层土壤性质的空间异质性及其分布格局,并基于RDA排序和方差分解定量评价地形因子对土壤各指标空间变异的影响程度和解释量。结果表明:云杉次生林土壤的pH值、有效氮、有效磷、有效钾和有机质含量呈明显的水平及垂直空间变异,0~10 cm层土壤上述5个指标的变异系数分别为8.78%、41.15%、58.36%、46.60%和48.38%;土壤变异的空间自相关范围为4.9~58.8 m,pH值和有效氮呈中等程度的空间自相关,有效磷、有效钾和有机质呈强烈的空间自相关变异;有效氮、有机质和有效钾呈相似的空间斑块状分布格局,即样地有效氮含量高的斑块中有机质和有效钾含量也高。pH值和有效磷则表现出相反的斑块分布格局;地形因子中,pH值、有效氮和有效磷受海拔影响最大,其中,海拔与pH值、有效磷呈正相关,分别解释其空间变异的40.43%和28.81%,而与有效氮呈负相关,能单独解释其空间变异的19.48%。凹凸度对有效钾和有机质的影响最大,可分别解释9.37%和6.88%的有效钾和有机质的空间变异,与这2个土壤性质指标为负相关。研究可为深入认识华北地区植物分布和物种共存提供基础依据。
[Abstract]:In order to reveal the spatial variation characteristics of forest soil and its variation mechanism, soil sampling and determination were carried out at 199 sampling sites in 4 hm~2 spruce secondary forest plots in Guandi Mountain according to the CTFS sampling scheme. The horizontal and vertical spatial distribution characteristics of soil pH, available nitrogen, available phosphorus, available potassium and organic matter were analyzed by classical statistical method. Geostatistics and Arc GIS interpolation were used to analyze the spatial distribution of soil pH, available nitrogen, available phosphorus, available potassium and organic matter. The spatial heterogeneity and distribution pattern of soil properties in 0 ~ 10 cm layer were analyzed, and the influence of topographic factors on spatial variation of soil indexes was evaluated quantitatively based on RDA sequencing and variance decomposition. The results showed that the soil pH, available nitrogen, available phosphorus of spruce secondary forest, The coefficients of variation of the above five indexes were 8.78 ~ 41.15 ~ 58.36% and 48.38%, respectively, and the spatial autocorrelation range of soil variability was 4.9 ~ 58.8 m ~ (-1) pH value and a moderate spatial autocorrelation between available nitrogen and pH value. Available phosphorus, available potassium and organic matter showed strong spatial autocorrelation variation, available nitrogen, organic matter and available potassium showed similar spatial patch distribution pattern. In other words, the organic matter and available potassium contents in the patches with high available nitrogen content were also high. Ph and available phosphorus showed the opposite pattern of patch distribution, and the available nitrogen and phosphorus in topographic factors were the most affected by altitude, among which, the elevation and pH values were the most important. The available phosphorus was positively correlated with 40.43% and 28.81% of the spatial variation, but negatively correlated with the available nitrogen, and 19.48% of the spatial variation could be explained separately. The effect of concavity and convexity on available potassium and organic matter was the greatest, which could explain the spatial variation of available potassium and organic matter in 9.37% and 6.88%, respectively, and was negatively correlated with the two soil properties. The study can provide the basis for further understanding the distribution of plants and the coexistence of species in North China.
【作者单位】：山西农业大学林学院;
【基金】：国家自然科学基金“密度制约和环境异质性对云杉次生林物种更新及功能性状的影响研究”(31470631),“寒温性云杉次生林树种更新过程中幼苗生态化学计量特征的时空格局及环境响应”(31670630)
【分类号】：S714

【相似文献】