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Soil acidification alters root morphology, increases root biomass but reduces root decomposition in an alpine grassland.
Wang, Peng; Guo, Jin; Xu, Xinyu; Yan, Xuebin; Zhang, Kangcheng; Qiu, Yunpeng; Zhao, Qingzhou; Huang, Kailing; Luo, Xi; Yang, Fei; Guo, Hui; Hu, Shuijin.
Afiliación
  • Wang P; College of Resources and Environmental Sciences, Nanjing Agricultural University, 210095, Nanjing, Jiangsu, China.
  • Guo J; College of Resources and Environmental Sciences, Nanjing Agricultural University, 210095, Nanjing, Jiangsu, China.
  • Xu X; College of Resources and Environmental Sciences, Nanjing Agricultural University, 210095, Nanjing, Jiangsu, China.
  • Yan X; College of Resources and Environmental Sciences, Nanjing Agricultural University, 210095, Nanjing, Jiangsu, China.
  • Zhang K; College of Resources and Environmental Sciences, Nanjing Agricultural University, 210095, Nanjing, Jiangsu, China.
  • Qiu Y; College of Resources and Environmental Sciences, Nanjing Agricultural University, 210095, Nanjing, Jiangsu, China.
  • Zhao Q; College of Resources and Environmental Sciences, Nanjing Agricultural University, 210095, Nanjing, Jiangsu, China.
  • Huang K; College of Resources and Environmental Sciences, Nanjing Agricultural University, 210095, Nanjing, Jiangsu, China.
  • Luo X; College of Resources and Environmental Sciences, Nanjing Agricultural University, 210095, Nanjing, Jiangsu, China.
  • Yang F; College of Resources and Environmental Sciences, Nanjing Agricultural University, 210095, Nanjing, Jiangsu, China.
  • Guo H; College of Resources and Environmental Sciences, Nanjing Agricultural University, 210095, Nanjing, Jiangsu, China.
  • Hu S; College of Resources and Environmental Sciences, Nanjing Agricultural University, 210095, Nanjing, Jiangsu, China; Department of Entomology & Plant Pathology, North Carolina State University, Raleigh, NC, 27695, United States. Electronic address: shuijin_hu@hotmail.com.
Environ Pollut ; 265(Pt A): 115016, 2020 Oct.
Article en En | MEDLINE | ID: mdl-32585396
Soil acidification has been expanding in many areas of Asia due to increasing reactive nitrogen (N) inputs and industrial activities. While the detrimental effects of acidification on forests have been extensively studied, less attention has been paid to grasslands, particularly alpine grasslands. In a soil pH manipulation experiment in the Qinghai-Tibet Plateau, we examined the effects of soil acidification on plant roots, which account for the major part of alpine plants. After three years of manipulation, soil pH decreased from 6.0 to 4.7 with the acid-addition gradient, accompanied by significant changes in the availability of soil nitrogen, phosphorus and cations. Plant composition shifted with the soil acidity, with graminoids replacing forbs. Differing from findings in forests, soil acidification in the alpine grassland increased root biomass by increasing the fraction of coarse roots and the production of fine roots, corresponding to enhanced sedge and grass biomass, respectively. In addition, litter decomposability decreased with altered root morphological and chemical traits, and soil acidification slowed root decomposition by reducing soil microbial activity and litter quality. Our results showed that acidification effect on root dynamics in our alpine grassland was significantly different from that in forests, and supported similar results obtained in limited studies in other grassland ecosystems. These results suggest an important role of root morphology in mediating root dynamics, and imply that soil acidification may lead to transient increase in soil carbon stock as root standing biomass and undecomposed root litter. These changes may reduce nutrient cycling and further constrain ecosystem productivity in nutrient-limiting alpine systems.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Suelo / Pradera País/Región como asunto: Asia Idioma: En Revista: Environ Pollut Asunto de la revista: SAUDE AMBIENTAL Año: 2020 Tipo del documento: Article País de afiliación: China Pais de publicación: Reino Unido
Texto completo
Añadir a Mi BVS
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Suelo / Pradera País/Región como asunto: Asia Idioma: En Revista: Environ Pollut Asunto de la revista: SAUDE AMBIENTAL Año: 2020 Tipo del documento: Article País de afiliación: China Pais de publicación: Reino Unido