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Hai-yan Gao, Mei Hong, Li-xia Huo, Peng-fei Liu, Fei Chang. Effect of water and nitrogen interaction on plant species diversity and biomass in a desert grassland[J]. Pratacultural Science, 2018, 12(1): 36-45. DOI: 10.11829/j.issn.1001-0629.2017-0167
Citation: Hai-yan Gao, Mei Hong, Li-xia Huo, Peng-fei Liu, Fei Chang. Effect of water and nitrogen interaction on plant species diversity and biomass in a desert grassland[J]. Pratacultural Science, 2018, 12(1): 36-45. DOI: 10.11829/j.issn.1001-0629.2017-0167

Effect of water and nitrogen interaction on plant species diversity and biomass in a desert grassland

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  • Received Date: April 05, 2017
  • Published Date: January 19, 2018
  • To demonstrate the effects of atmospheric nitrogen deposition and precipitation on species diversity and biomass in desert grassland, we examined water and nitrogen interactions, using three levels of water treatment [natural precipitation (CK), increased precipitation 30% (W) and reduced precipitation 30% (R)] and four nitrogen (NH4NO3) levels: 0 (N0), 30 (N30), 50 (N50), and 100 (N100) kg·(hm2·a)-1 (which does not include atmospheric nitrogen deposition). The following results were obtained: 1) The species diversity of desert grassland under CK×N and R×N treatments increased with an increase in nitrogen application rate, showing an initial increase trend and a subsequent decrease, with maximum diversity being attained with the N30 treatment. Under the W×N treatment, the species diversity was significantly reduced (P<0.05) with an increase of nitrogen application rate. 2) The aboveground biomass obtained with CK×N0 and R×N0 treatments was significantly increased (P<0.05) compared with the W×N0 treatment. Under the water and nitrogen interaction, the aboveground biomass of CK×N and W×N treatments was significantly increased (P<0.05) with an increase in nitrogen application rate. The water and nitrogen interaction had a significant effect on annual and biennial plants. The overall aboveground biomass trend was as follows: (W×N) > (CK×N) > (R×N). 3) Under the water and nitrogen interactions, the underground biomass decreased gradually with the depth of soil, and was mainly concentrated in the 0-30 cm. The W×N treatment promoted root extension into deeper soil. The biomass of desert grassland under CK×N and R×N treatments showed an initial increase trend and then a subsequent decrease with an increase of nitrogen application rate, and the underground biomass obtained with the W×N treatment showed a significant increase (P<0.05). 4) The treatments of CK×N30 and R×N30 significantly reduced the root/shoot ratio (P<0.05). Collectively, the results of this study showed that the plant species diversity and biomass in desert grassland are closely related to water and nutrients.
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