scholarly journals Effects and pathways of long-term nitrogen addition on plant diversity and primary productivity in a typical steppe

2020 ◽  
Vol 44 (1) ◽  
pp. 22-32
Author(s):  
Yu-Bing WANG ◽  
Yi-Han SUN ◽  
Wei DING ◽  
En-Tao ZHANG ◽  
Wen-Huai LI ◽  
...  
Keyword(s):  
Plant Diversity ◽  
Primary Productivity ◽  
Nitrogen Addition ◽  
Typical Steppe

scholarly journals Resource enrichment combined with biomass removal maintains plant diversity and community stability in a long-term grazed grassland

2020 ◽  
Vol 13 (5) ◽  
pp. 611-620
Author(s):  
Feng-Wei Xu ◽  
Jian-Jun Li ◽  
Li-Ji Wu ◽  
Xiao-Ming Lu ◽  
Wen Xing ◽  
...  
Keyword(s):  
Species Richness ◽  
Species Diversity ◽  
Plant Diversity ◽  
Primary Productivity ◽  
Management Practices ◽  
Light Exposure ◽  
Community Stability ◽  
Water Addition ◽  
Biomass Removal

Abstract Aims Long-term heavy grazing reduces plant diversity and ecosystem function by intensifying nitrogen (N) and water limitation. In contrast, the absence of biomass removal can cause species loss by elevating light competition and weakening community stability, which is exacerbated by N and water enrichment. Hence, how to maintain species diversity and community stability is still a huge challenge for sustainable management of worldwide grasslands. Methods We conducted a 4-year manipulated experiment in six long-term grazing blocks to explore combination of resource additions and biomass removal (increased water, N and light availability) on species richness and community stability in semiarid grasslands of Inner Mongolia, China. Important Findings In all blocks treated with the combination of resource additions and biomass removal, primary productivity increased and species richness and community stability were maintained over 4 years of experiment. At both species and plant functional group (PFG) levels, the aboveground biomass of treated plants remained temporally stable in treatments with the combination of N and/or water addition and biomass removal. The maintenance of species richness was primarily caused by the biomass removal, which could increase the amount of light exposure for grasses under resource enrichment. Both species asynchrony and stability of PFGs contributed to the high temporal stability observed in these communities. Our results indicate that management practices of combined resource enrichment with biomass removal, such as grazing or mowing, could not only enhance primary productivity but also maintain plant species diversity, species asynchrony and community stability. Furthermore, as overgrazing-induced degradation and resource enrichment-induced biodiversity loss continue to be major problems worldwide, our findings have important implications for adaptive management in semiarid grasslands and beyond.

scholarly journals Diversity‐dependent plant–soil feedbacks underlie long‐term plant diversity effects on primary productivity

Ecosphere ◽  
2019 ◽  
Vol 10 (4) ◽  
pp. e02704 ◽  
Author(s):  
Nathaly R. Guerrero‐Ramírez ◽  
Peter B. Reich ◽  
Cameron Wagg ◽  
Marcel Ciobanu ◽  
Nico Eisenhauer
Keyword(s):  
Plant Diversity ◽  
Primary Productivity ◽  
Plant Soil ◽  
Diversity Effects

Soil microbial community responses to long-term nitrogen addition at different soil depths in a typical steppe

2021 ◽  
Vol 167 ◽  
pp. 104054
Author(s):  
Guoxiang Niu ◽  
Muqier Hasi ◽  
Ruzhen Wang ◽  
Yinliu Wang ◽  
Qianqian Geng ◽  
...  
Keyword(s):  
Microbial Community ◽  
Soil Microbial Community ◽  
Nitrogen Addition ◽  
Community Responses ◽  
Soil Microbial ◽  
Typical Steppe

scholarly journals Multiple Evidence for Climate Patterns Influencing Ecosystem Productivity across Spatial Gradients in the Venice Lagoon

2021 ◽  
Vol 9 (4) ◽  
pp. 363
Author(s):  
Camilla Bertolini ◽  
Edouard Royer ◽  
Roberto Pastres
Keyword(s):  
Time Series ◽  
Primary Productivity ◽  
Clustering Analysis ◽  
Venice Lagoon ◽  
Spatial Effects ◽  
Spatial Gradients ◽  
Climate Forecasting ◽  
Oxygen Production Rate ◽  
Temporal And Spatial

Effects of climatic changes in transitional ecosystems are often not linear, with some areas likely experiencing faster or more intense responses, which something important to consider in the perspective of climate forecasting. In this study of the Venice lagoon, time series of the past decade were used, and primary productivity was estimated from hourly oxygen data using a published model. Temporal and spatial patterns of water temperature, salinity and productivity time series were identified by applying clustering analysis. Phytoplankton and nutrient data from long-term surveys were correlated to primary productivity model outputs. pmax, the maximum oxygen production rate in a given day, was found to positively correlate with plankton variables measured in surveys. Clustering analysis showed the occurrence of summer heatwaves in 2008, 2013, 2015 and 2018 and three warm prolonged summers (2012, 2017, 2019) coincided with lower summer pmax values. Spatial effects in terms of temperature were found with segregation between confined and open areas, although the patterns varied from year to year. Production and respiration differences showed that the lagoon, despite seasonality, was overall heterotrophic, with internal water bodies having greater values of heterotrophy. Warm, dry years with high salinity had lower degrees of summer autotrophy.

The long-term effects of monoculture maize cultivation on plant diversity

2021 ◽  
Vol 50 (4) ◽  
pp. 397-408
Author(s):  
Anneliese Fuchs ◽  
Vanessa Berger ◽  
Klaus Steinbauer ◽  
Tobias Köstl ◽  
Daniel Wuttej ◽  
...  
Keyword(s):  
Plant Diversity ◽  
Long Term Effects ◽  
Maize Cultivation
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