干旱区生态环境知识资源中心(Arid): Woody plant encroachment may decrease plant carbon storage in grasslands under future drier conditions

Arid

DOI	10.1093/jpe/rtaa003
	Woody plant encroachment may decrease plant carbon storage in grasslands under future drier conditions
	Liu, Yun-Hua 1; Cheng, Jun-Hui 1; Schmid, Bernhard 2; Tang, Li-Song 3; Sheng, Jian-Dong 1
通讯作者	Sheng, Jian-Dong
来源期刊	JOURNAL OF PLANT ECOLOGY
ISSN	1752-9921
EISSN	1752-993X
出版年	2020
卷号	13 期号:2 页码:213-223
英文摘要	Aims Woody plants are widely distributed in various grassland types along the altitudinal/climatic gradients in Xinjiang, China. Considering previously reported change in carbon (C) storage following woody plant encroachment in grasslands and the mediating effect of climate on this change, we predicted that a positive effect of woody plants on plant C storage in semiarid grasslands may revert to a negative effect in arid grasslands. We first investigated the spatial variation of aboveground C (AGC) and belowground C (BGC) storage among grassland types and then tested our prediction. Methods We measured the living AGC storage, litter C (LC) and BGC storage of plants in two physiognomic types, wooded grasslands (aboveground biomass of woody plants at least 50%) and pure grasslands without woody plants in six grassland types representing a gradient form semiarid to arid conditions across Xinjiang. Important Findings Living AGC, LC, BGC and total plant C storage increased from desert to mountain meadows. These increases could also be explained by increasing mean annual precipitation (MAP) or decreasing mean annual temperature (MAT), suggesting that grassland types indeed represented an aridity gradient. Woody plants had an effect on the plant C storage both in size and in distribution relative to pure grasslands. The direction and strength of the effect of woody plants varied with grassland types due to the mediating effect of the climate, with wetter conditions promoting a positive effect of woody plants. Woody plants increased vegetation-level AGC through their high AGC relative to herbaceous plants. However, more negative effects of woody plants on herbaceous plants with increasing aridity led to a weaker increase in the living AGC in arid desert, steppe desert and desert steppe than in the less arid other grassland types. Under greater aridity (lower MAP and higher MAT), woody plants allocated less biomass to roots and had lower BGC and had a more negative impact on herbaceous plant production, thereby reducing vegetation-level BGC in the desert, steppe desert and desert steppe. In sum, this resulted in a negative effect of woody plants on total plant C storage in the most arid grasslands in Xinjiang. As a consequence, we predict that woody plant encroachment may decrease rather than increase C storage in grasslands under future drier conditions.
英文关键词	woody plant encroachment aridity gradients plant C storage climate grassland types Xinjiang
类型	Article
语种	英语
国家	Peoples R China ; Switzerland
开放获取类型	Bronze, Green Accepted
收录类别	SCI-E
WOS记录号	WOS:000544726900011
WOS关键词	BELOW-GROUND BIOMASS ; SHRUB ENCROACHMENT ; COVER ; DYNAMICS ; DRYLANDS ; STOCKS ; POOLS ; ROOT
WOS类目	Plant Sciences ; Ecology ; Forestry
WOS研究方向	Plant Sciences ; Environmental Sciences & Ecology ; Forestry
来源机构	中国科学院新疆生态与地理研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/319672
作者单位	1.Xinjiang Agr Univ, Coll Grassland & Environm Sci, Dept Ecol & Environm Sci, Xinjiang Key Lab Soil & Plant Ecol Proc, Urumqi 830052, Xinjiang Uygur, Peoples R China; 2.Univ Zurich, Dept Geog, Zurich, Switzerland; 3.Chinese Acad Sci, Xinjiang Inst Ecol & Geog, State Key Lab Desert & Oasis Ecol, Urumqi 830011, Xinjiang Uygur, Peoples R China
推荐引用方式 GB/T 7714	Liu, Yun-Hua,Cheng, Jun-Hui,Schmid, Bernhard,et al. Woody plant encroachment may decrease plant carbon storage in grasslands under future drier conditions[J]. 中国科学院新疆生态与地理研究所,2020,13(2):213-223.
APA	Liu, Yun-Hua,Cheng, Jun-Hui,Schmid, Bernhard,Tang, Li-Song,&Sheng, Jian-Dong.(2020).Woody plant encroachment may decrease plant carbon storage in grasslands under future drier conditions.JOURNAL OF PLANT ECOLOGY,13(2),213-223.
MLA	Liu, Yun-Hua,et al."Woody plant encroachment may decrease plant carbon storage in grasslands under future drier conditions".JOURNAL OF PLANT ECOLOGY 13.2(2020):213-223.