Abstract
We aimed to study the effect of resource redistribution on annual plant species diversity in Runoff-Harvesting Systems, termed limans, along the runoff pathway in a watershed. We tested the effect of resource redistribution (water and nutrients) relative role of biomass, grass and forb abundance as mediators of species diversity. Our research was conducted in five small watersheds located in the central Negev Highlands, Israel. We quantified nutrient addition including soil nitrogen, phosphorus, potassium, total water content, and soil organic matter, in the liman, compared with two microsites (upstream, and downstream) along watersheds. We quantified biomass, grass and forb abundance and species richness in two successive years. We used structural equation modeling to study the effect of grass and forb abundance and biomass on the species richness of herbaceous plant communities. All tested soil properties significantly improved in the liman compared with the two microsites. Annual biomass increased significantly in the liman in compared with the downstream microsite. Our results also indicate a reduction in forb abundance in the liman and the downstream, and increment in the grass abundance in the liman microsite, leading to a decline in plant species richness. We conclude that diversity responses to biomass production are both resource-specific and functional group-specific.
Original language | American English |
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Article number | 103984 |
Journal | Journal of Arid Environments |
Volume | 171 |
DOIs | |
State | Published - Dec 2019 |
Externally published | Yes |
Bibliographical note
Funding Information:This research was partly supported by the Jewish National Fund (01-13-101-02), and by the European Union's Horizon 2020 Research and Innovation Programme under grant agreements 641762 (Ecopotential) and 654359 (eLTER). We also would like to acknowledge the Jewish National Fund for their support and contribution to this study.
Funding Information:
This research was partly supported by the Jewish National Fund ( 01-13-101-02 ), and by the European Union's Horizon 2020 Research and Innovation Programme under grant agreements 641762 (Ecopotential) and 654359 (eLTER). We also would like to acknowledge the Jewish National Fund for their support and contribution to this study.
Publisher Copyright:
© 2019 The Authors
Keywords
- Biomass
- Conductivity
- Dryland watershed management
- Forb
- Grasses
- Nutrient enrichment
- Species richness
- Water enrichment