Chen Tingting, Sheng Meihua, Xiao Jingyao, Ai Shenghao, Kou Jianing, Yang Qinqing, Ai Yingwei, Ma Jinqiang, Zhu Guoyu, Ai Xiaoyan
Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Sichuan 610065, China.
Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610213, China; University of Chinese Academy of Sciences, Beijing 100049, China.
Sci Total Environ. 2024 Dec 1;954:176623. doi: 10.1016/j.scitotenv.2024.176623. Epub 2024 Oct 10.
Soil phosphorus (P) has attracted considerable attention from researchers because of its role in the restoration and stabilization processes of cut slopes in permafrost regions. However, the soil P pool distributions and adsorption-desorption characteristics in alpine cut slopes remain unclear. In this context, we examined in this study the P pools in the aggregates of surface cut soil slopes (0-10 cm) in areas with three permafrost types, including perennially frozen soil (PF), seasonally frozen ground (SFG), and non-frozen soil (NFS) in the Qinghai-Tibet Plateau, China. In addition, we assessed the P adsorption-desorption characteristics and their correlations with the P pools. The results showed the significant effects of the permafrost types on the contents of total P (TP), available P (AP), labile P (LP), moderately labile P (MLP) and stable P (SP). The inorganic P (IP) contents were higher than those of organic P (OP) in the cut soil slopes of the three permafrost types. In addition, HO-Pi and NaHCO-Pi accounted for small proportions of IP, while NaHCO-Po accounted for the smallest proportion of OP. On the other hand, the SP contents in the soil aggregates were generally higher than those of MLP and LP. In fact, the LP contents in the PF, SFG, and NFS were 72.55, 44.68, and 49.42 mg/kg, respectively. The AP contents in the cut soil slopes of the three permafrost types were significantly correlated with the MLP and LP contents. Moreover, the P adsorption-desorption characteristics of the SFG and NFS were closely related to AP and MLP. Compared with the PF and NFS, the SFG exhibited low and high P adsorption and desorption capacities, respectively. The findings of this study provided an important theoretical basis for the restoration of cut slopes in alpine permafrost regions.
由于土壤磷（P）在多年冻土区削坡的恢复和稳定过程中发挥作用，因此受到了研究人员的广泛关注。然而，高寒削坡土壤磷库分布及其吸附 - 解吸特性仍不清楚。在此背景下，本研究对中国青藏高原三种多年冻土类型（包括多年冻土（PF）、季节性冻土（SFG）和非冻土（NFS））区域的表层削坡土壤（0 - 10厘米）团聚体中的磷库进行了研究。此外，我们评估了磷的吸附 - 解吸特性及其与磷库的相关性。结果表明，多年冻土类型对总磷（TP）、有效磷（AP）、活性磷（LP）、中度活性磷（MLP）和稳定磷（SP）含量有显著影响。三种多年冻土类型的削坡土壤中无机磷（IP）含量高于有机磷（OP）。此外，HO - Pi和NaHCO - Pi在IP中所占比例较小，而NaHCO - Po在OP中所占比例最小。另一方面，土壤团聚体中的SP含量通常高于MLP和LP。实际上，PF、SFG和NFS中的LP含量分别为72.55、44.68和49.42毫克/千克。三种多年冻土类型的削坡土壤中的AP含量与MLP和LP含量显著相关。此外，SFG和NFS的磷吸附 - 解吸特性与AP和MLP密切相关。与PF和NFS相比，SFG分别表现出较低和较高的磷吸附和解吸能力。本研究结果为高寒多年冻土区削坡的恢复提供了重要的理论依据。
