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土壤微生物是地球生物演化进程中的先锋种类,具有重要的生态修复功能,但空间分布格局是否存在的争议很大。以云贵高原典型喀斯特坡耕地为对象,基于网格法取样,用经典统计学和地统计学综合分析了土壤微生物生物量的空间变异特征。结果表明,云贵高原喀斯特坡耕地土壤微生物生物量碳(Cmic)、磷(Pmic)以及碳氮比(Cmic/Nmic)适宜,氮(Nmic)的含量较低,变异均很大,空间自相关性明显,最佳拟合模型均为指数模型。块金值C0较小(0.0016—0.0087),C0/(C0+C)均<25%(2.6%—10.2%),变程a较短(22.2—51.0 m),其强烈的空间变异主要由结构性变异引起。Kriging等值线图表明,Cmic、Nmic和Cmic/Nmic的高值区分布在坡的中上部,Pmic的高值区则在坡的中下部和坡脚。云贵高原喀斯特坡耕地土壤微生物不仅存在着小尺度的空间分布格局,而且不同土壤微生物属性的空间分布不同。
Soil microorganisms are pioneers in the evolution of the Earth’s biology and have important ecological restoration functions. However, the existence of spatial distribution patterns is controversial. Taking the typical karst slope farmland in the Yungui-Guiyang Plateau as an example, the spatial variability of soil microbial biomass was comprehensively analyzed by using classical statistics and geo-statistics. The results showed that the soil microbial biomass carbon (Cmic), phosphorus (Pmic), Cmic / Nmic and nitrogen (Nmic) contents in the karst grassland of Yunnan-Guizhou Plateau were lower, Obviously, the best fit models are exponential models. The bulk value of gold (C0 + (C0 + C)) was less than 0.006-0.0087 (C0 / C0 + C), and the range of a was shorter (22.2-51.0 m) Structural variation caused. The Kriging contour map shows that the high values of Cmic, Nmic and Cmic / Nmic are located in the middle and upper parts of the slope while the high values of Pmic are in the middle and lower parts of the slope and the foot of the slope. Soil microbes in the karst slope farmland in the Yunnan-Guizhou Plateau not only have small-scale spatial distribution patterns, but also have different spatial distribution of soil microbial attributes.