Revegetation pattern affecting accumulation of organic carbon and total nitrogen in reclaimed mine soils

PeerJ

article

Ping Ping Zhang¹  Yan Le Zhang³  Jun Chao Jia³  Yong Xing Cui³  Xia Wang³  Xing Chang Zhang³  Yun Qiang Wang¹ 

[1] State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences;CAS Center for Excellence in Quaternary Science and Global Change;Institute of Soil and Water Conservation, Chinese Academy of Science and Ministry of Water Resources;University of Chinese Academy of Sciences

关键词: Land use;    Mine land;    Soil organic carbon;    Total nitrogen;    Restoration;   

DOI  :  10.7717/peerj.8563

学科分类：社会科学、人文和艺术（综合）

来源: Inra

【 摘 要 】

Selecting optimal revegetation patterns, i.e., patterns that are more effective for soil organic carbon (SOC) and total nitrogen (TN) accumulation, is particularly important for mine land reclamation. However, there have been few evaluations of the effects of different revegetation patterns on the SOC and TN in reclaimed mine soils on the Loess Plateau, China. In this study, the SOC and TN stocks were investigated at reclaimed mine sites (RMSs), including artificially revegetated sites (ARSs) (arbors (Ar), bushes (Bu), arbor-bush mixtures (AB), and grasslands (Gr)) and a natural recovery site (NRS), as well as at undisturbed native sites (UNSs). Overall, the SOC and TN stocks in the RMSs were lower than those in the UNSs over 10–13 years after reclamation. The SOC stocks in the RMSs and UNSs only differed in the top 0–20 cm of the soil (p < 0.05). Except for those in Ar, the SOC and TN stocks in the ARSs were significantly larger than those in the NRS (p < 0.05). Compared with those in the NRS, the total SOC stocks in the 100 cm soil interval increased by 51.4%, 59.9%, and 109.9% for Bu, AB, and Gr, respectively, and the TN stocks increased by 33.1%, 35.1%, and 57.9%. The SOC stocks in the 0–100 cm soil interval decreased in the order of Gr (3.78 kg m−2 AB (2.88 kg m−2) ≥ Bu (2.72 kg m−2), and the TN stocks exhibited a similar trend. These results suggest that grasslands were more favorable than woodlands for SOC and TN accumulation in this arid area. Thus, in terms of the accumulation of SOC and TN, grassland planting is recommended as a revegetation pattern for areas with reclaimed mine soils.

【 授权许可】

CC BY