Mapping current and future habitat suitability of Azolla spp., a biofertilizer for small-scale rice farming in Africa

被引:3
|
作者
Ocloo, Xorla S. [1 ,2 ]
Vazquez-Prokopec, Gonzalo M. [3 ]
Civitello, David J. [4 ]
机构
[1] DePaul Univ, Dept African & Black Diaspora Studies, Chicago, IL 60614 USA
[2] DePaul Univ, Dept Environm Sci & Studies, Chicago, IL 60614 USA
[3] Emory Univ, Dept Environm Sci, Atlanta, GA USA
[4] Emory Univ, Dept Biol, Atlanta, GA USA
来源
PLOS ONE | 2023年 / 18卷 / 12期
关键词
USE EFFICIENCY; NITROGEN; OPPORTUNITIES; CHALLENGES; ECOSYSTEMS; PHOSPHORUS; FRAMEWORK; GROWTH;
D O I
10.1371/journal.pone.0291009
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
How do we feed the expanding human population without excessive resource depletion or environmental degradation? Recycling and recapturing nutrients could alleviate these challenges, especially if these strategies are robust to climate change. Co-cultivating rice with Azolla spp. in Asia has demonstrated high yields with reduced fertilizer inputs because Azolla fixes atmospheric nitrogen, limits nitrogen volatilization, recaptures and releases other nutrients, and suppresses weeds. While Azolla is distributed in Africa, this approach has not been widely implemented in African rice-farming. Characterizing the suitability of Azolla is critical in evaluating the potential for Azolla-rice in Africa. To do so, we synthesized 189 field and greenhouse studies from around the world that quantified temperature-dependent growth of A. pinnata and A. filiculoides and developed present and future climate suitability maps at the continental scale using mean temperatures under two Representative Concentration Pathways. Currently, most of Africa is suitable for Azolla with slight differences in regional suitability for each species. We project little change in the continent-wide suitability for both species, but anticipate a regional decline, particularly for A. filiculoides in the Sahel. Collaborating with farmers to validate these projections, evaluate the costs and benefits of Azolla-rice, and facilitate adoption of viable strategies can facilitate equitable food systems that also empower African farmers.
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页数:15
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