干旱区生态环境知识资源中心(Arid): Nitrogen addition delays the emergence of an aridity-induced threshold for plant biomass

Arid

DOI	10.1093/nsr/nwad242
	Nitrogen addition delays the emergence of an aridity-induced threshold for plant biomass
	Li, Hailing; Terrer, Cesar; Berdugo, Miguel; Maestre, Fernando T.; Zhu, Zaichun; Penuelas, Josep; Yu, Kailiang; Luo, Lin; Gong, Jie-Yu; Ye, Jian-Sheng
通讯作者	Ye, JS
来源期刊	NATIONAL SCIENCE REVIEW
ISSN	2095-5138
EISSN	2053-714X
出版年	2023
卷号	10 期号:11
英文摘要	Crossing certain aridity thresholds in global drylands can lead to abrupt decays of ecosystem attributes such as plant productivity, potentially causing land degradation and desertification. It is largely unknown, however, whether these thresholds can be altered by other key global change drivers known to affect the water-use efficiency and productivity of vegetation, such as elevated CO2 and nitrogen (N). Using >5000 empirical measurements of plant biomass, we showed that crossing an aridity (1-precipitation/potential evapotranspiration) threshold of similar to 0.50, which marks the transition from dry sub-humid to semi-arid climates, led to abrupt declines in aboveground biomass (AGB) and progressive increases in root:shoot ratios, thus importantly affecting carbon stocks and their distribution. N addition significantly increased AGB and delayed the emergence of its aridity threshold from 0.49 to 0.55 (P < 0.05). By coupling remote sensing estimates of leaf area index with simulations from multiple models, we found that CO2 enrichment did not alter the observed aridity threshold. By 2100, and under the RCP 8.5 scenario, we forecast a 0.3% net increase in the global land area exceeding the aridity threshold detected under a scenario that includes N deposition, in comparison to a 2.9% net increase if the N effect is not considered. Our study thus indicates that N addition could mitigate to a great extent the negative impact of increasing aridity on plant biomass in drylands. These findings are critical for improving forecasts of abrupt vegetation changes in response to ongoing global environmental change.
英文关键词	aboveground biomass root:shoot ratios elevated CO2 nitrogen fertilization ecosystem threshold
类型	Article
语种	英语
开放获取类型	Green Published, gold
收录类别	SCI-E
WOS记录号	WOS:001092458400003
WOS关键词	ELEVATED CO2 ; SEMIARID ECOSYSTEMS ; ATMOSPHERIC CO2 ; WATER RELATIONS ; DROUGHT STRESS ; RESPONSES ; FERTILIZATION ; CLIMATE ; GROWTH ; PHOTOSYNTHESIS
WOS类目	Multidisciplinary Sciences
WOS研究方向	Science & Technology - Other Topics
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/397880
推荐引用方式 GB/T 7714	Li, Hailing,Terrer, Cesar,Berdugo, Miguel,et al. Nitrogen addition delays the emergence of an aridity-induced threshold for plant biomass[J],2023,10(11).
APA	Li, Hailing.,Terrer, Cesar.,Berdugo, Miguel.,Maestre, Fernando T..,Zhu, Zaichun.,...&Ye, Jian-Sheng.(2023).Nitrogen addition delays the emergence of an aridity-induced threshold for plant biomass.NATIONAL SCIENCE REVIEW,10(11).
MLA	Li, Hailing,et al."Nitrogen addition delays the emergence of an aridity-induced threshold for plant biomass".NATIONAL SCIENCE REVIEW 10.11(2023).