| Title | Neutral effect of nitrogen addition and negative effect of phosphorus addition on topsoil extracellular enzymatic activities in an alpine grassland ecosystem |
| Authors | Jing, Xin Yang, Xiaoxia Ren, Fei Zhou, Huakun Zhu, Biao He, Jin-Sheng |
| Affiliation | Peking Univ, Dept Ecol, Coll Urban & Environm Sci, 5 Yiheyuan Rd, Beijing 100871, Peoples R China. Peking Univ, Key Lab Earth Surface Proc, Minist Educ, 5 Yiheyuan Rd, Beijing 100871, Peoples R China. Chinese Acad Sci, Northwest Inst Plateau Biol, Key Lab Adaptat & Evolut Plateau Biota, 23 Xinning Rd, Xining 810008, Peoples R China. Qinghai Acad Anim & Vet Sci, Key Lab Alpine Grassland Ecosyst River Head Water, Xining 810016, Peoples R China. Peking Univ, Dept Ecol, 5 Yiheyuan Rd, Beijing 100871, Peoples R China. |
| Keywords | Soil extracellular enzyme Nitrogen Phosphorus Nutrient availability Alpine grassland Tibetan Plateau SOIL MICROBIAL BIOMASS TERRESTRIAL ECOSYSTEMS TIBETAN PLATEAU NUTRIENT INPUTS BIODIVERSITY LOSS ORGANIC-MATTER CARBON STORAGE BOREAL FOREST RESPONSES FERTILIZATION |
| Issue Date | 2016 |
| Publisher | APPLIED SOIL ECOLOGY |
| Citation | APPLIED SOIL ECOLOGY.2016,107,205-213. |
| Abstract | Soil nitrogen (N) and phosphorus (P) are common limiting nutrients affecting plant primary productivity in alpine ecosystems due to the low decomposition rate, though anthropogenic activities have greatly increased their inputs into ecosystems. Little is known regarding the effects of increasing N and P availabilities on the functioning of belowground microbial communities. To determine how soil microorganisms respond to N and P addition, we measured plant primary productivity, soil microbial biomass, soil mineral N availability, soil respiration, and the activities of soil extracellular enzymes after two years of N- and P-addition in an alpine grassland ecosystem on the Tibetan Plateau. We observed no significant effect of N addition on plant biomass, soil microbial biomass, soil respiration, or the activities of soil extracellular enzymes. In contrast, P addition increased plant biomass but suppressed the activities of most labile-C-cycling enzymes at 0-10 cm of soil depth, although the effects on soil microbial biomass and soil respiration were minor. Moreover, there was no interaction between N and P addition on these variables. Overall, N addition does not appear to exert a significant effect on plant primary productivity and microbial activity, whereas P addition increases plant primary productivity and tends to suppress topsoil microbial activity after two years of nutrient application. (C) 2016 Elsevier B.V. All rights reserved. |
| URI | http://hdl.handle.net/20.500.11897/457478 |
| ISSN | 0929-1393 |
| DOI | 10.1016/j.apsoil.2016.06.004 |
| Indexed | SCI(E) |
| Appears in Collections: | 城市与环境学院 地表过程分析与模拟教育部重点实验室 |
