气候变化领域集成服务门户(CCPortal): On China's Qinghai-Tibetan Plateau, duration of grazing exclosure alters R: S ratio, root morphology and attending root biomass

CCPortal

DOI	10.1016/j.still.2021.104969
	On China's Qinghai-Tibetan Plateau, duration of grazing exclosure alters R: S ratio, root morphology and attending root biomass
	Cao, Jianjun; Wei, Chen; Adamowski, Jan F.; Biswas, Asim; Li, Yumei; Zhu, Guofeng; Liu, Chunfang; Feng, Qi
发表日期	2021
ISSN	0167-1987
EISSN	1879-3444
卷号	209
英文摘要	Unsustainable human actions and climate change have threatened global grasslands and lead to biodiversity loss and compromised ecosystem functions. Widely considered to be an effective approach to restore degraded grasslands, grazing exclosure (GE) likely affects biomass allocation and root morphology in the long-term, although their impacts are yet to be documented. The objective of this study was to investigate the effects of grazing exclosure durations of 5, 22, and 39 years (GE(5), GE(22), GE(39), respectively) on root:shoot biomass allocation (R:S ratio) and root morphology ? including root average diameter (RAD), root density (RD), specific root length (SRL), specific root area (SRA), and root length density (RLD) - in an alpine grassland on the Qinghai Tibetan Plateau. Seasonal grazing (SG) land served as a control. In the 0-0.30 m soil layer, the R:S ratios of the SG (1.27) and GE(5) sites (0.90) were significantly lower than that of the GE(39) site (2.14). However, there was no difference between the GE(22) (1.83) and GE(39) sites. The R:S ratio of the 0-0.15 m soil layer showed an increasing trend with duration of grazing exclosure and had a significantly greater value under GE(39) (1.89) than under GE(5) (0.76). However, the R:S ratios for the 0.15-0.30 m soil layer (0.14, 0.28 and 0.25 for GE(5), GE(22), and GE(39), respectively) showed no significant changes with grazing exclosure duration. In the 0-0.30 m soil layer across sampled sites, RAD remained constant, RD and RLD exhibited an increasing trend, while SRA and SRL displayed a slightly decreasing trend with grazing exclosure duration. Below-ground biomass (BGB) was most strongly related to RLD across all sites; to RD and RLD at the GE(5) and GE(22) sites, and to RAD and RLD at the GE(39) site. Both R:S ratio and root morphology were mainly influenced by soil nitrate nitrogen. Although long-term grazing exclosure enhanced BGB and R:S ratio, soil nutrients declined with increasing exclosure duration. Therefore, to achieve improved ecosystem functions, grazing exclosure should be used with caution in this area or other similar regions around the world.
英文关键词	Alpine grassland; Grazing exclosure; Biomass allocation; Root length density; Specific root length
WOS研究方向	Agriculture
WOS类目	Soil Science
WOS记录号	WOS:000630768900001
来源期刊	SOIL & TILLAGE RESEARCH
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/239439
作者单位	[Cao, Jianjun; Wei, Chen; Li, Yumei; Zhu, Guofeng; Liu, Chunfang] Northwest Normal Univ, Coll Geog & Environm Sci, Lanzhou 730070, Peoples R China; [Cao, Jianjun] Northwest Normal Univ, Minist Educ, Key Lab Ecofunct Polymer Mat, Lanzhou 730070, Peoples R China; [Adamowski, Jan F.] McGill Univ, Fac Agr & Environm Sci, Dept Bioresource Engn, Ste Anne De Bellevue, PQ H9X 3V9, Canada; [Biswas, Asim] Univ Guelph, Sch Environm Sci, 50 Stone Rd East, Guelph, ON N1G 2W1, Canada; [Liu, Chunfang] Gansu Engn Res Centerof Land Utilizat & Comprehen, Lanzhou 730070, Peoples R China; [Feng, Qi] Chinese Acad Sci, Cold & Arid Reg Environm Engn Res Inst, Alashan Desert Ecohydrol Expt Res Stn, Key Lab Ecohydrol Inland River Basin, Lanzhou 73000, Peoples R China
推荐引用方式 GB/T 7714	Cao, Jianjun,Wei, Chen,Adamowski, Jan F.,et al. On China's Qinghai-Tibetan Plateau, duration of grazing exclosure alters R: S ratio, root morphology and attending root biomass[J]. 中国科学院西北生态环境资源研究院,2021,209.
APA	Cao, Jianjun.,Wei, Chen.,Adamowski, Jan F..,Biswas, Asim.,Li, Yumei.,...&Feng, Qi.(2021).On China's Qinghai-Tibetan Plateau, duration of grazing exclosure alters R: S ratio, root morphology and attending root biomass.SOIL & TILLAGE RESEARCH,209.
MLA	Cao, Jianjun,et al."On China's Qinghai-Tibetan Plateau, duration of grazing exclosure alters R: S ratio, root morphology and attending root biomass".SOIL & TILLAGE RESEARCH 209(2021).