干旱区生态环境知识资源中心(Arid): A 5-and a-half-year-experiment shows precipitation thresholds in litter decomposition and nutrient dynamics in arid and semi-arid regions

Arid

DOI	10.1007/s00374-023-01779-5
	A 5-and a-half-year-experiment shows precipitation thresholds in litter decomposition and nutrient dynamics in arid and semi-arid regions
	Qu, Hao; Medina-Roldan, Eduardo; Wang, Shaokun; Ma, Xujun; Wang, Xinyuan; Tang, Xia; Liu, Liangxu
通讯作者	Medina-Roldán, E
来源期刊	BIOLOGY AND FERTILITY OF SOILS
ISSN	0178-2762
EISSN	1432-0789
出版年	2024
卷号	60 期号:2 页码:199-212
英文摘要	Precipitation is a key driver of litter decomposition in arid/semiarid regions; where soils are poor in organic matter, and thus re-incorporation of litter is key for soil nutrient accumulation and soil structure. It remains unclear, though, whether litter decomposition responds symmetrically to precipitation variation (e.g., if precipitation surpluses produce a stimulatory effect of a similar magnitude, but opposite direction to inhibitory effects of precipitation deficits), and whether litter decomposition and litter nutrient dynamics in arid and semiarid ecosystems that differ in climate show similar responses to precipitation. We set up a 5-and-a-half-year experiment that manipulated rainfall along a gradient (7 treatments): increases by 20%, 40%, and 60%, background precipitation, and reductions by the same 3 percentages. We applied such experiment in two sites with different pattens of precipitation (Urat: arid; and Naiman: semiarid) in Inner Mongolia to elucidate our questions. Litter mass loss and all nutrients that we measured (carbon, nitrogen, phosphorous, potassium, plus lignin) decomposed faster at the highest level of surplus precipitation, and more slowly in the two largest precipitation reductions. This indicates that these levels of precipitation constitute thresholds (value of precipitation beyond which ecosystem function is critically altered). Litter decomposition in the semiarid site was faster and more complete, but decomposition in the direr Urat was more efficient per unit cumulative rainfall. Thus, site specific effects played an important role in decomposition. Reductions in precipitation decreased the loss of C, N, P, K, and lignin from litter; and clear precipitation thresholds in the dynamic of these nutrients in litter were observed. Overall, this indicated the importance of precipitation limitation at controlling nutrient release. Our study highlights the importance of long-term studies on litter decomposition in environments with slow decomposition rates, and the importance of taking into account mechanistic effects of water availability on decomposition.
英文关键词	Arid and semiarid regions litter mass loss litter nutrients' dynamics precipitation thresholds ecosystem functioning precipitation limitation of decomposition
类型	Article
语种	英语
开放获取类型	hybrid
收录类别	SCI-E
WOS记录号	WOS:001107751500001
WOS关键词	INNER-MONGOLIA ; NITROGEN ADDITION ; GRASSLAND ; RESPONSES ; PATTERNS ; CLIMATE ; MODEL ; WATER ; DROUGHT ; CYCLES
WOS类目	Soil Science
WOS研究方向	Agriculture
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/403025
推荐引用方式 GB/T 7714	Qu, Hao,Medina-Roldan, Eduardo,Wang, Shaokun,et al. A 5-and a-half-year-experiment shows precipitation thresholds in litter decomposition and nutrient dynamics in arid and semi-arid regions[J],2024,60(2):199-212.
APA	Qu, Hao.,Medina-Roldan, Eduardo.,Wang, Shaokun.,Ma, Xujun.,Wang, Xinyuan.,...&Liu, Liangxu.(2024).A 5-and a-half-year-experiment shows precipitation thresholds in litter decomposition and nutrient dynamics in arid and semi-arid regions.BIOLOGY AND FERTILITY OF SOILS,60(2),199-212.
MLA	Qu, Hao,et al."A 5-and a-half-year-experiment shows precipitation thresholds in litter decomposition and nutrient dynamics in arid and semi-arid regions".BIOLOGY AND FERTILITY OF SOILS 60.2(2024):199-212.