Effects of Resource Additions on Species Richness and ANPP in an Alpine Meadow Community. Ren, Z., Li, Q., Chu, C., Zhao, L., Zhang, J., Ai, D., Yang, Y., & Wang, G. Journal of Plant Ecology, 3(1):25–31, March, 2010.
doi  abstract   bibtex   
[Aims] Theories based on resource additions indicate that plant species richness is mainly determined by the number of limiting resources. However, the individual effects of various limiting resources on species richness and aboveground net primary productivity (ANPP) are less well understood. Here, we analyzed potential linkages between additions of limiting resources, species loss and ANPP increase and further explored the underlying mechanisms. [Methods] Resources (N, P, K and water) were added in a completely randomized block design to alpine meadow plots in the Qinghai-Tibetan Plateau. Plant aboveground biomass, species composition, mean plant height and light availability were measured in each plot. Regression and analysis of variance were used to analyze the responses of these measures to the different resource-addition treatments. [Important Findings] Species richness decreased with increasing number of added limiting resources, suggesting that plant diversity was apparently determined by the number of limiting resources. Nitrogen was the most important limiting resource affecting species richness, whereas P and K alone had negligible effects. The largest reduction in species richness occurred when all three elements were added in combination. Water played a different role compared with the other limiting resources. Species richness increased when water was added to the treatments with N and P or with N, P and K. The decreases in species richness after resource additions were paralleled by increases in ANPP and decreases in light penetration into the plant canopy, suggesting that increased light competition was responsible for the negative effects of resource additions on plant species richness. [Excerpt: Discussion] [] [...] [] In summary, our experimental results demonstrated that [::(i)] species richness declined with increasing number of added limiting resources, and effects of N, P, K or water additions on species richness were not equivalent; [::(ii)] the largest reduction in species richness occurred when N, P and K were added together, which showed that these limiting resources had additive effects; [::(iii)] addition treatments containing N decreased species richness and increased ANPP and [::(iv)] at high ANPP, plant species became light limited, and the increased Gini coefficient of plant height indicated that the light competition was a reasonable explanation for decreased species richness.
@article{renEffectsResourceAdditions2010,
  title = {Effects of Resource Additions on Species Richness and {{ANPP}} in an Alpine Meadow Community},
  author = {Ren, Zhengwei and Li, Qi and Chu, Chengjin and Zhao, Luqiang and Zhang, Jieqi and Ai, Dexiecuo and Yang, Yingbo and Wang, Gang},
  year = {2010},
  month = mar,
  volume = {3},
  pages = {25--31},
  issn = {1752-993X},
  doi = {10.1093/jpe/rtp034},
  abstract = {[Aims] Theories based on resource additions indicate that plant species richness is mainly determined by the number of limiting resources. However, the individual effects of various limiting resources on species richness and aboveground net primary productivity (ANPP) are less well understood. Here, we analyzed potential linkages between additions of limiting resources, species loss and ANPP increase and further explored the underlying mechanisms.

[Methods] Resources (N, P, K and water) were added in a completely randomized block design to alpine meadow plots in the Qinghai-Tibetan Plateau. Plant aboveground biomass, species composition, mean plant height and light availability were measured in each plot. Regression and analysis of variance were used to analyze the responses of these measures to the different resource-addition treatments.

[Important Findings] Species richness decreased with increasing number of added limiting resources, suggesting that plant diversity was apparently determined by the number of limiting resources. Nitrogen was the most important limiting resource affecting species richness, whereas P and K alone had negligible effects. The largest reduction in species richness occurred when all three elements were added in combination. Water played a different role compared with the other limiting resources. Species richness increased when water was added to the treatments with N and P or with N, P and K. The decreases in species richness after resource additions were paralleled by increases in ANPP and decreases in light penetration into the plant canopy, suggesting that increased light competition was responsible for the negative effects of resource additions on plant species richness. 

[Excerpt: Discussion]

[] [...]

[] In summary, our experimental results demonstrated that [::(i)] species richness declined with increasing number of added limiting resources, and effects of N, P, K or water additions on species richness were not equivalent; [::(ii)] the largest reduction in species richness occurred when N, P and K were added together, which showed that these limiting resources had additive effects; [::(iii)] addition treatments containing N decreased species richness and increased ANPP and [::(iv)] at high ANPP, plant species became light limited, and the increased Gini coefficient of plant height indicated that the light competition was a reasonable explanation for decreased species richness.},
  journal = {Journal of Plant Ecology},
  keywords = {*imported-from-citeulike-INRMM,~INRMM-MiD:c-14128368,complexity,himalayan-region,limiting-factor,meadows,multiplicity,nitrogen,non-linearity,phosphorus,plant-communities,potassium,primary-productivity,species-association,species-richness,vegetation},
  lccn = {INRMM-MiD:c-14128368},
  number = {1}
}
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