Ecological Indicators | |
Impacts of saltwater intrusion on soil nematodes community in alluvial and acid sulfate soils in paddy rice fields in the Vietnamese Mekong Delta | |
Roland N. Perry1  Minh Khoi Chau1  Van Khoa Le2  Thi Kim Phuong Nguyen3  Gyu Lee Chol3  Koki Toyota3  Quang Minh Vo3  Ba Linh Tran3  Anh Duc Tran4  Van Sinh Nguyen5  Masaaki Araki5  Duy Minh Dang6  | |
[1] Department of Soil Science, Can Tho University. Campus II, 3/2 Street, Ninh Kieu District, Cantho City, Viet Nam;Department of Land Resources, Can Tho University, Campus II, Can Tho City, Viet Nam;Department of Soil Science, Can Tho University. Campus II, 3/2 Street, Ninh Kieu District, Cantho City, Viet Nam;Environmental Bio-function Division, National Institute for Agro-Environmental Sciences. 3-1-3 Kannondai, Tsukuba 305-8604, Japan;Graduate School of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology. 2-24-16 Naka-cho, Koganei-shi, Tokyo 184-8588, Japan;School of Life and Medical Sciences, University of Hertfordshire. Hatfield, Hertfordshire AL10 9AB, UK; | |
关键词: Nematode diversity; Indicator species; Paddy rice; Nematode functional guild; Salinity; Soil fertility; | |
DOI : | |
来源: DOAJ |
【 摘 要 】
Saltwater intrusion is a potential risk damaging crop diversity and productivity due to degraded soil physicochemical properties. However, little is known about how salinity affects the structure and function of soil nematodes community in intensive rice cultivated area. This study aimed (1) to assess the impacts of saltwater intrusion on the nematode community in alluvial and acid sulfate soils; and (2) to evaluate its relation with soil conditions. Saltwater intrusion reduced the abundance of both free-living nematodes (FLN) and plant-parasitic nematodes (dominated by Hirschmanniella) in soils. FLN community was different among sites with different physicochemical properties. The omnivorous genera Aporcelaimellus and Thornenema were only found in non-salt-affected alluvial soil, whilst Mesodorylaimus was dominant in salt-affected acid sulfate soil, suggesting that this genus might be tolerant to higher EC and soluble Na+, K+, Ca2+. The bacterivorous nematodes (dominant taxa Chronogaster, Rhabdolaimus) were dominant in both non-salt affected and salt-affected alluvial soils, which accounted for 48% and 40%, respectively, whilst it accounted for 21% in salt-affected acid sulfate soil. The abundance of fungivorous nematodes (Aphelenchoides, Ditylenchus, Filenchus) were greater in salt-affected alluvial soil in contrast to the other treatments, suggesting that these might be tolerant to salinity and low pH. Saltwater intrusion reduced biological diversity (Margalef, Shannon-Wiener, and Hill’s indices), maturity index (∑MI, MI25), and clearly affected functional guilds of nematode community, especially c-p 5 group was reduced in both salt-affected soils. This study suggests that saltwater intrusion showed a potential risk in the degradation of soil properties, as indicated by the altered nematode community, trophic structure, functional guilds and their ecological indices in paddy fields.
【 授权许可】
Unknown