Sciences in Cold and Arid Regions ›› 2016, Vol. 8 ›› Issue (1): 46–53.doi: 10.3724/SP.J.1226.2016.00046
• ARTICLES • 上一篇
Salinity effects on soil organic carbon and its labile fractions, and nematode communities in irrigated farmlands in an arid region, northwestern China
YongZhong Su1, TingNa Liu1, XueFen Wang2, Rong Yang1
- 1. Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China;
2. Jinlin Agricultural University, Changchun, Jilin 130118, China
Salinity effects on soil organic carbon and its labile fractions, and nematode communities in irrigated farmlands in an arid region, northwestern China
YongZhong Su1, TingNa Liu1, XueFen Wang2, Rong Yang1
- 1. Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China;
2. Jinlin Agricultural University, Changchun, Jilin 130118, China
摘要： The effects of salinity on soil organic carbon (SOC) and its labile fractions including microbial biomass carbon (MBC) and easily oxidation organic carbon (EOC), basal soil respiration, and soil nematode community in the Fluvents, an oasis in an arid region of northwestern China were investigated. Five sites were selected which had a salinity gradient with different groundwater table from 1.0 m to 4.0 m. Soils were sampled at the 0-20 cm plough layer from 25 irrigated fields of five sites and electrical conductivity was measured in the saturation paste extracts (ECe). Soils were categorized into five salinity levels:(1) non-saline, (2) very slightly saline, (3) slightly saline, (4) moderately saline, and (5) strongly saline according to the values of ECe. The results show that SOC and total nitrogen concentration, cation exchange capacity (CEC), and the concentrations of labile organic fractions (MBC, EOC), and basal soil respiration decreased significantly with increasing ECe. The relationships between ECe and MBC, EOC and basal soil respiration were best described by power functions. Slight and moderate salinity had no significant impact on soil nematode abundance, but excessive salt accumulation led to a marked decline in soil nematode community diversity and abundance. Soil salinity changed soil nematode trophic groups and bacterivores were the most abundant trophic groups in salt-affected soils. Further study is necessary to identify the response of soil microbial processes and nematode community dynamics to soil salinity.
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Changes in free-living nematode community structure in relation to progressive land reclamation at an intertidal marsh. Applied Soil Ecology, 9:47-58. Yang JS, 2008. Development and prospect of the research on salt-affected soils in China. Acta Pedologica Sinica, 45:838-845. Yeates, 2003. Nematodes as soil indicators:functional and biodiversity aspects. Biology and Fertility of Soils, 37:199-210. Yeates GW, Bongers T, De Goede RGM, et al., 1993. Feeding habits in soil nematode families and genera:an outline for soil ecologists. Journal of Nematology, 25:315-331. Yeates GW, Williams PA, 2001. Influence of three invasive weeds pp. 837-871. Anderson TH, Domsch KH, 1989. Ratios of microbial biomass to total organic carbon in arable soils. Soil Biology & Biochemistry, 21:471-479. Beltrán-Hernádez RI, Luna-Guido ML, Dendooven L, 2007. Emission of carbon dioxide and dynamics of inorganic N in a gradient of alkaline soils of the former lake Texcoco. Applied Soil Ecology, 35:390-403. 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Effect of fungal to bacterial biomass ratio on the relationship between CO2 evolution and total soil microbial biomass. Biology and Fertility of Soils, 17:39-44. Kenren R, 2000. Salinity. In:Sumner ME (ed.). Handbook of Soil Science. Boca Raton:CRC Press, pp. 3-25. Liang WJ, Li Q, Jiang Y, et al., 2005. Nematode faunal analysis in an aquic brown soil fertilized with slow-release urea, Northeast China. Applied Soil Ecology, 29:285-292. Liu WJ, Su YZ, Yang R, et al., 2010. Land use effects on soil organic carbon, nitrogen and salinity in saline-alkaline wetland. Sciences in Cold and Arid Regions, 2(3):263-270. Llamas DP, Gonzales MD, Gonzales CI, et al., 2008. Effects of water potential on spore germination and viability of Fusarium species. Journal of Industrial Microbiology & Biotechnology, 35:1411-1418. Mandeel QA, 2006. Biodiversity of the genus Fusarium in saline soil habitats. Journal of Basic Microbiology, 46:480-494. Mayi MS, Marschner P, Chittleboroug DJ, et al., 2012. Salinity and sodicity affect soil respiration and dissolved organic matter dynamics differentially in soils varying in texture. Soil Biology & Biochemistry, 45:8-13. Muhammad S, Müller T, Joergensen GR, 2008. Relationships between soil biological and other soil properties in saline and alkaline arable soils from the Pakistani Punjab. Journal of Arid Environments, 21:448-457. Pankhurst CE, Yu S, Hawke BG, et al., 2001. Capacity of fatty acid profiles and substrate utilisation patterns to describe differences in soil microbial communities associated with increased salinity or alkalinity at three locations win South Australia. Biology and Fertility of Soils, 33:204-217. Pen-Mouratov S, Hu C, Hindin E, et al., 2011. Soil microbial activity and a free-living nematode community in the playa and in the sandy biological crust. Biology and Fertility of Soils, 47:363-375. Pen-Mouratov S, Rakhimbaev M, Steinberger Y, 2003. Seasonal and spatial variation in nematode communities in a Negev desert ecosystem. Journal of Nematology, 35:157-166. Rengasamy P, 2006. World salinization with emphasis on Australia. Journal of Experimental Botany, 57:1017-1023. Rhoades JD, 1996. Salinity:Electrical conductivity and total dis-solved salts. In:Sparks DL, Page AL, Helmke PA, et al. (ed.). Methods of Soil Analysis. Part 3. SSSA Book Series No. 5. Madison, WI:ASA and SSSA, pp. 417-436. Rietz DN, Haynes RJ, 2003. Effects of irrigation-induced salinity and sodicity on soil microbial activity. Soil Biology & Biochemistry, 35:845-854. Setia R, Marschner P, Baldock J, et al., 2011. Relationships between carbon dioxide emission and soil properties in salt-affected landscapes. Soil Biology & Biochemistry, 43:667-674. Soil Investigation Office in Zhangye Prefecture, Gansu Province, 1986. Soils in Zhangye Prefecture, Gansu, pp. 161-171. Soil Survey Division Staff, 1993. Soil Survey Manual. USDA Handbook vol. 18. 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Impact of salinity on soil microbial communities and the decomposition of maize in acidic soils. Geoderma, 137:100-108. Wong VNL, Dalal RC, Greene RSB, 2008. Salinity and sodicity effects on respiration and microbial biomass of soil. Biology and Fertility of Soils, 44:943-953. Wong VNL, Dalal RC, Greene RSB, 2009. Carbon dynamics of sodic and saline soils following gypsum and organic material additions:A laboratory incubation. Applied Soil Ecology, 41:29-40. Wu JH, Fu CZ, Lu F, et al., 2005. Changes in free-living nematode community structure in relation to progressive land reclamation at an intertidal marsh. Applied Soil Ecology, 9:47-58. Yang JS, 2008. Development and prospect of the research on salt-affected soils in China. Acta Pedologica Sinica, 45:838-845. Yeates, 2003. Nematodes as soil indicators:functional and biodiversity aspects. Biology and Fertility of Soils, 37:199-210. Yeates GW, Bongers T, De Goede RGM, et al., 1993. Feeding habits in soil nematode families and genera:an outline for soil ecologists. Journal of Nematology, 25:315-331. Yeates GW, Williams PA, 2001. Influence of three invasive weeds and site factors on soil microfauna in New Zealand. Pedobiologia, 45:367-383. Yuan BC, Li ZZ, Liu H, et al., 2007. Microbial biomass and activity in salt affected soils under arid conditions. Applied Soil Ecology, 35:319-328. |
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