Chin J Plant Ecol ›› 2020, Vol. 44 ›› Issue (1): 22-32.DOI: 10.17521/cjpe.2019.0260
• Research Articles • Previous Articles Next Articles
WANG Yu-Bing1,2,SUN Yi-Han1,2,DING Wei3,ZHANG En-Tao1,2,LI Wen-Huai1,CHI Yong-Gang4,*(),ZHENG Shu-Xia1,*(
)
Received:
2019-10-01
Revised:
2020-01-09
Online:
2020-01-20
Published:
2020-02-24
Contact:
CHI Yong-Gang,ZHENG Shu-Xia
Supported by:
WANG Yu-Bing,SUN Yi-Han,DING Wei,ZHANG En-Tao,LI Wen-Huai,CHI Yong-Gang,ZHENG Shu-Xia. Effects and pathways of long-term nitrogen addition on plant diversity and primary productivity in a typical steppe[J]. Chin J Plant Ecol, 2020, 44(1): 22-32.
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URL: https://www.plant-ecology.com/EN/10.17521/cjpe.2019.0260
Fig. 1 Effects of N addition on species richness (A) and Shannon-Wiener index (B) in a typical steppe (mean + SE). Control, absolute control, no fertilizer added. Different lowercase letters indicate significant difference among treatments (p < 0.05).
Fig. 2 Effect of N addition on functional attribute diversity (FAD) in a typical steppe (mean + SE). A, Plant trait functional diversity, calculated by plant height (PH), individual biomass (PB) and stem:leaf biomass ratio (SLR). B, Leaf trait functional diversity, calculated by specific leaf area (SLA), leaf dry mass content (LDMC), and leaf N content (LNC). C, Whole-plant trait functional diversity, calculated by six indices of plant and leaf traits. Control, absolute control, no fertilizer added. No significant difference among treatments (p > 0.05).
Fig. 3 Effects of N addition on community-weighted mean traits in a typical steppe (mean + SE). Community-weighted mean traits included community-weighted plant height (PHCWM), individual biomass (PBCWM), stem:leaf biomass ratio (SLRCWM), specific leaf area (SLACWM), leaf dry mass content (LDMCCWM), and leaf N content (LNCCWM). Control, absolute control, no fertilizer added. No significant difference among treatments (p > 0.05).
Fig. 4 Effects of N addition on the relative aboveground biomass (RAB) of six dominant species in a typical steppe (mean ± SE). PR, perennial rhizome grasses; PB, perennial bunch grasses; PF, perennial forbs. Control, absolute control, no fertilizer added.
Fig. 5 Effect of N addition on aboveground net primary productivity (ANPP) in a typical steppe (mean + SE). Control, absolute control, no fertilizer added. No significant difference among treatments (p > 0.05).
Fig. 6 Structural equation model (SEM) analyses of pathways of N addition on aboveground net primary productivity (ANPP). Results of SEM fitting: c2 = 3.611, p = 0.89, df = 8, n = 13, RMSEA < 0.001, AIC = 29.61, CFI = 1.000. ANPP, aboveground net primary productivity; CWM, community-weighted mean traits; FAD, functional attribute diversity; PR/PB, biomass ratio of perennial rhizome grass to perennial bunchgrass, indicating a shift in functional group composition. Solid and dashed arrows indicate significant (p < 0.05) and non-significant (p > 0.05) effects, respectively. Values associated with solid arrows represent standardized path coefficients (β); *, p < 0.05; **, p < 0.01; ***, p < 0.001. r2 values associated with response variables indicate the proportion of variation explained by relationships with other variables.
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