不同喀斯特地貌下土壤有机碳的空间分布特征及其对上壤的影响。
The Spatial Distribution Characteristics of Soil Organic Carbon and Its Effects on Topsoil under Different Karst Landforms.
机构信息
School of Karst Science, Guizhou Normal University, Guiyang 550001, Guizhou, China.
Guizhou Provincial Key Laboratory of Information System of Mountainous Areas and Protection of Ecological Environment, Guizhou Normal University, Guiyang 550001, Guizhou, China.
出版信息
Int J Environ Res Public Health. 2020 Apr 22;17(8):2889. doi: 10.3390/ijerph17082889.
Karst landforms are widely distributed in Guizhou Province, and the karst terrain is complex. To investigate the spatial distribution characteristics of soil organic carbon (SOC) in topsoil in different karst landforms, a total of 920 samples were taken from different karst landforms. The study areas, Puding, Xingyi, Guanling, Libo and Yinjiang in Guizhou Province, represent the karst plateau (KP), karst peak-cluster depression (KPCD), karst canyon (KC), karst virgin forest (KVF) and karst trough valley (KTV) landforms, respectively. The characteristics of the SOC contents in areas with different vegetation, land use and soil types under different karst landforms were analyzed. The dimensionality of the factors was reduced via principal component analysis, the relationships among SOC content and different factors were subjected to redundancy analysis, and the effects of the main impact factors on SOC were discussed. The results showed that there was a large discrepancy in the SOC contents in the topsoil layers among different types of karst landforms, the changes in the SOC content in the topsoil layer were highly variable, and the discrepancy in the upper soil layer was higher than that in the lower soil layer. The SOC contents in the 0-50 cm topsoil layers in different karst landforms were between 7.76 and 38.29 g·kg, the SOC content gradually decreased with increasing soil depth, and the descending order of the SOC contents in different karst landforms was KTV > KVF > KC > KPCD > KP.
喀斯特地貌广泛分布于贵州省，喀斯特地形复杂。为了研究不同喀斯特地貌表层土壤有机碳（SOC）的空间分布特征，在贵州省的普定、兴义、关岭、荔波和银江共采集了 920 个样本。研究区域分别代表了喀斯特高原（KP）、喀斯特峰丛洼地（KPCD）、喀斯特峡谷（KC）、喀斯特原始森林（KVF）和喀斯特槽谷（KTV）地貌。分析了不同植被、土地利用和土壤类型下不同喀斯特地貌区 SOC 含量的特征。通过主成分分析降低了因子的维数，对 SOC 含量与不同因子之间的关系进行了冗余分析，并讨论了主要影响因子对 SOC 的影响。结果表明，不同喀斯特地貌类型的表层土壤 SOC 含量存在较大差异，表层土壤 SOC 含量变化高度可变，上层土壤差异高于下层土壤。不同喀斯特地貌的 0-50cm 表层土壤 SOC 含量在 7.76-38.29g·kg 之间，SOC 含量随土壤深度的增加而逐渐降低，不同喀斯特地貌的 SOC 含量降序为 KTV>KVF>KC>KPCD>KP。
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