Growth and physiological responses of subalpine forbs to nitrogen and soil moisture: investigating the potential roles of plant functional traits

被引:1
|
作者
Slominski, Anthony H. [1 ,2 ,3 ]
German, Zac [2 ,4 ]
Burkle, Laura A. [3 ]
机构
[1] Western State Colorado Univ, Dept Biol, Gunnison, CO 81231 USA
[2] Rocky Mt Biol Labs, Crested Butte, CO 81224 USA
[3] Montana State Univ, Dept Ecol, Bozeman, MT 59717 USA
[4] Colorado State Univ, Dept Biol, Ft Collins, CO 80523 USA
关键词
Climate change; Photosynthesis; Transpiration; Floral display; STOMATAL CONDUCTANCE; CLIMATE-CHANGE; CHLOROPHYLL FLUORESCENCE; HYDRAULIC CONDUCTANCE; COMMUNITY COMPOSITION; SPECIES RICHNESS; WATER; PHOTOSYNTHESIS; ENRICHMENT; DEPOSITION;
D O I
10.1007/s11258-018-0848-9
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Anthropogenic inputs of biologically available nitrogen (N) and climate change are simultaneously altering N and soil moisture availability in terrestrial ecosystems. Yet, plant responses to concurrent changes in both N and soil moisture in non-grassland ecosystems remain poorly understood. Our objective was to investigate how rooting depth and N-fixing ability-two functional traits we expected to mediate soil moisture and N limitations-influence forb responses to N and soil moisture availability in the Rocky Mountains USA. We assessed the growth and physiological responses (i.e., chlorophyll fluorescence, transpiration rate, and floral display) of four subalpine forb species to N additions across a naturally-occurring soil moisture gradient during one growing season. Soil moisture had a stronger positive effect on growth in shallow-rooted species and N additions had a stronger positive effect on photosynthetic capacity in species without N-fixing abilities. Transpiration rates were not consistent with soil moisture limitations expected for shallow-rooted species, and soil moisture and N had a neutral or negative influence on maximum floral displays across species. Nitrogen and soil moisture appeared to each limit separate response variables in some cases and we did not observe any N x soil moisture interactions. These findings suggest that shallow-rooted species may be more vulnerable to increased drought severity and that increased N availability may disproportionately benefit species without N-fixing abilities. However, mixed support for our hypotheses suggests that environmental conditions and functional traits not evaluated here likely influence subalpine plant responses to soil moisture and N availability.
引用
收藏
页码:941 / 956
页数:16
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