Zoological Studies

Vol. 60, 2021

(update: 2021.10.12)

A Soil Nematode Community Response to Reclamation of Salinized Abandoned Farmland

Lei Yang1, Fenghua Zhang1,*, and Yanqin Luo1

1The Key Laboratory of Oasis Eco-agriculture, Xinjiang Production and Construction Corps, Shihezi University, Shihezi, Xinjiang, 832003, China. Correspondence: E-mail: zhangfenghua6088@126.com (Zhang)
E-mail: yanglei24@163.com (Yang); 627102636@qq.com (Luo)

Received 13 May 2021 / Accepted 20 September 2021
Communicated by Benny K.K. Chan

Development from abandoned land to farmland after vegetation reestablishment for reclamation is an important salinization rehabilitation process in dryland ecosystems. While subsequent soil abiotic changes have been reported, few studies focused on how reclamation affected soil biota. Understanding the response of soil biota to reclamation is useful for evaluating the effect of agricultural management. We investigated soil physiochemical properties, the composition and structure of nematode communities, and nematode metabolic footprints in the control and reclaimed farmland. The results showed that soil properties were significantly altered by reclamation. In particular, reclamation significantly increased pH, organic carbon, total nitrogen, and microbial biomass carbon. Conversely, electrical conductivity was significantly decreased. Shannon and Simpson indices were affected by reclamation. Reclamation significantly increased Shannon index in the 10-20 cm soil layer. Reclamation significantly increased Simpson index in the 0-10 cm soil layer, while the change of value in the 10-20 cm soil layer was opposite. High basal index and fungal-based channel were found in the control. Total nematodes abundance increased due to reclamation, which included fungivores, herbivores, and omnivores-predators. More nematodes could store more biomass carbon in the reclaimed farmland. Reclamation had an effect on the structure and function of soil food web, and increased the metabolic footprints of varied trophic groups of nematodes. Nematode faunal analysis revealed that exogenous substances input led to the high level of communities structure, and the soil food web became mature in the reclaimed farmland. The nematode communities were affected by reclamation. Furthermore, pH, EC, SOC, TN, and MBC were key driving factors affecting the nematode communities. Therefore, reclamation could effectively enhance the structure and function of soil food web through bottom-up effects in the cotton fields in Xinjiang, China.

Key words: Faunal analysis, Metabolic footprint, Soil food web, Soil health, Land use.

Citation: Yang L, Zhang FH, Luo YQ. 2021. A soil nematode community response to reclamation of salinized abandoned farmland. Zool Stud 60:72.

Supplementary materials: Table S1