College of Forestry, Sichuan Agricultural University, Chengdu 611130, China.
College of Forestry, Sichuan Agricultural University, Chengdu 611130, China; Meitan County Forestry Bureau of Guizhou Province, Zunyi 564100, China.
Sci Total Environ. 2023 Jun 20;878:163185. doi: 10.1016/j.scitotenv.2023.163185. Epub 2023 Mar 31.
Vegetation restoration is a good way to improve soil quality and reduce erosion. However, the impact of vegetation restoration on soil quality in the dry-hot valley region has been overlooked for many years. This study aimed to reveal the effects of Pennisetum sinese (PS) and natural vegetation (NV) on soil quality and then to explore the feasibility of introducing PS for the vegetation restoration of the dry-hot valley region. The PS and NV restoration areas deserted land evolving from cultivated land (CL) have been established since 2011. The results showed that the soil properties were obviously improved by PS from the dry to wet seasons, except for the soil available phosphorous. The comprehensive soil quality indexes of the three typical seasons (dry, dry-wet, and wet) were determined by using nonlinear weighted additive (NLWA) based on the total dataset, significant dataset and minimum dataset (MDS). The results indicated that the comprehensive minimum dataset soil quality index (MDS-SQI) of the three typical seasons evaluate soil quality well. The soil quality of PS was significantly greater than that of CL and NV (P < 0.05), as shown by the MDS-SQI. Additionally, PS could maintain a stable soil quality in the three typical seasons, while both CL and NV had obvious fluctuations. In addition, the result of the generalized linear mode suggested that the vegetation type had the greatest impact on the soil quality (44.51 %). Comprehensively, vegetation restoration in the dry-hot valley region has a positive impact on the soil properties and quality. PS is a great candidate species for the early vegetation restoration in the dry-hot valley region. This work provides a reference for vegetation restoration and rational utilization of soil resources in degraded ecosystems in dry-hot valleys and other soil erosion areas.
植被恢复是改善土壤质量和减少侵蚀的一种好方法。然而，多年来，植被恢复对干旱热谷地区土壤质量的影响一直被忽视。本研究旨在揭示中华狼尾草（PS）和天然植被（NV）对土壤质量的影响，进而探讨引入 PS 进行干旱热谷地区植被恢复的可行性。自 2011 年以来，已在从耕地（CL）演替而来的 PS 和 NV 恢复区建立了研究样地。结果表明，PS 从旱季到雨季明显改善了土壤性质，但土壤有效磷除外。利用基于总数据集、显著数据集和最小数据集（MDS）的非线性加权加和（NLWA）方法，确定了三个典型季节（旱季、旱-雨季和雨季）的综合土壤质量指数。结果表明，三个典型季节的综合最小数据集土壤质量指数（MDS-SQI）能够很好地评价土壤质量。与 CL 和 NV 相比，PS 的土壤质量明显更高（P<0.05），这可以从 MDS-SQI 中看出。此外，PS 能够在三个典型季节保持稳定的土壤质量，而 CL 和 NV 则有明显波动。此外，广义线性模型的结果表明，植被类型对土壤质量的影响最大（44.51%）。综合来看，干旱热谷地区的植被恢复对土壤性质和质量有积极影响。PS 是干旱热谷地区早期植被恢复的理想候选物种。这项工作为干旱热谷和其他土壤侵蚀地区退化生态系统的植被恢复和土壤资源的合理利用提供了参考。
