College of Forestry, Guizhou Universtry, Guiyang, China.
Guizhou Botanical Garden, Guiyang, China.
PLoS One. 2021 Jun 30;16(6):e0252838. doi: 10.1371/journal.pone.0252838. eCollection 2021.
Rocky desertification is the most serious ecological disaster in karst areas. Comprehensive control of rocky desertification plays an important role in promoting the economic development of karst areas. Studying the stoichiometric characteristics of mosses and soil can provide a powerful reference for the ecological restoration and evaluation of ecosystems experiencing rocky desertification. Soil and mosses were collected from sites representing different stages of ecological restoration (bare rock, grassland, shrubland, and secondary forest), and the contents of carbon (C), nitrogen (N), and phosphorus (P) were detected for ecological stoichiometric analysis. The results indicate that in different restoration stages following karst rocky desertification, the contents of soil organic carbon (SOC), total nitrogen (TN), and total phosphorus (TP) and the stoichiometric ratios in the shrub habitat are higher than those in the bare rock, grassland, and secondary forest habitats. However, the TP and available P contents were low at all stages (0.06 g/kg and 0.62 mg/kg, respectively). The N and P contents and stoichiometric ratios in the mosses showed no significant differences among the succession stages. The C contents in the mosses had a significant positive correlation with SOC and TN and TP content, and the P content had a significant positive correlation with the soil available P. However, there was a significant negative correlation between the C: N and C:P ratios of the bryophytes and soil C: N. In summary, during the process of natural restoration of karst rocky desertification areas, SOC and soil TN contents accumulate with each succession stage. Soil nutrients are higher in shrub habitats than in other succession stages. Mosses have a strong effect on improving soil nutrients in rocky desertification areas.
石漠化是岩溶地区最严重的生态问题。岩溶石漠化综合治理对促进岩溶地区经济发展具有重要作用。研究苔藓和土壤的化学计量特征可为遭受石漠化的生态系统的生态恢复和评价提供有力参考。从代表不同生态恢复阶段（裸岩、草地、灌丛和次生林）的地点采集了土壤和苔藓，并检测了碳（C）、氮（N）和磷（P）的含量，进行生态化学计量分析。结果表明，在岩溶石漠化后不同的恢复阶段，灌木生境中的土壤有机碳（SOC）、总氮（TN）和总磷（TP）含量以及化学计量比均高于裸岩、草地和次生林生境。然而，各阶段土壤有效磷（AP）和总磷（TP）含量均较低（分别为 0.06g/kg 和 0.62mg/kg）。苔藓中的 N 和 P 含量和化学计量比在演替阶段之间没有显著差异。苔藓中的 C 含量与 SOC 和 TN 以及 TP 含量呈显著正相关，P 含量与土壤有效 P 呈显著正相关。然而，苔藓的 C:N 和 C:P 比值与土壤 C:N 呈显著负相关。总之，在岩溶石漠化地区自然恢复过程中，SOC 和土壤 TN 含量随演替阶段而积累。土壤养分在灌丛生境中高于其他演替阶段。苔藓对改善石漠化地区土壤养分具有重要作用。
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