气候变化领域集成服务门户(CCPortal): Fencing enclosure alters nitrogen distribution patterns and tradeoff strategies in an alpine meadow on the Qinghai-Tibetan Plateau

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DOI	10.1016/j.catena.2020.104948
	Fencing enclosure alters nitrogen distribution patterns and tradeoff strategies in an alpine meadow on the Qinghai-Tibetan Plateau
	Chen X.; Zhang T.; Guo R.; Li H.; Zhang R.; Allan Degen A.; Huang K.; Wang X.; Bai Y.; Shang Z.
发表日期	2021
ISSN	3418162
卷号	197
英文摘要	The grasslands of Qinghai-Tibetan Plateau have become extremely degraded, resulting in widespread deficiency of soil N. In efforts to restore degraded lands, fencing enclosure has been used extensively. However, the effect of fencing on N allocation patterns and nutritional strategy of alpine plants are equivocal. In this study, we used 15N tracer (CO (15NH2)2, 10 g N m−2) to examine the allocation and distribution of N in plants and soil in grasslands either grazed heavily by livestock or fenced for three years in an alpine meadow of Northern Tibet. The 15N recovery (15Nrec) in shoots of the fenced enclosure increased by 207% in grasses, decreased by 103% in forbs, and did not change in sedges when compared to the grazed meadow. The 15Nrec in shoots accounted for only 1.97% and 4.65% of the total N in the grazed and fenced meadows, respectively. Fencing increased soil 15N content at 0–5 cm depth by 6.9%, but decreased the content at 5–10 cm depth by 11.7%. The results demonstrated that fencing altered the soil N distribution by increasing 15Nrec in top soil and by decreasing 15Nrec in subsurface soil. In addition, fencing had no impact on root 15N storage (33%–39%), 15N losses (9.6%–12.5%) and soil available 15Nrec (NH4+-N, NO3–-N and light fraction organic N), but decreased root:shoot 15Nrec ratio by 49.8% (16.9:1 in grazed and 8.4:1 in fenced grassland). Fencing increased soil organic carbon, total N and NO3–-N concentrations, which indicated that the strategy of the plants was to allocate relatively more N to roots in nutrient-poor soil (grazed) but relatively more N to shoots in nutrient-rich soil (fenced). © 2020 Elsevier B.V.
英文关键词	15N tracing; Alpine meadow; Grazing exclusion; Nutrition strategy
语种	英语
scopus关键词	Catena
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/158301
作者单位	College of Grassland Science; Shanxi Agricultural University; Taigu; 030801; China; State Key Laboratory of Grassland Agro-Ecosystems; School of Life Sciences; Lanzhou University; Lanzhou; 730000; China; Key Laboratory of Vegetation Ecology; Ministry of Education; Institute of Grassland Science; Northeast Normal University; Changchun; Jilin 130024; China; Northwest Institute of Eco-Environment and Resources; Chinese Academy of Sciences; Lanzhou; 730000; China; Desert Animal Adaptations and Husbandry; Wyler Department of Dryland Agriculture; Blaustein Institutes for Desert Research; Ben-Gurion University of the Negev; Beer Sheva; 8410500; Israel; Key Laboratory of Mountain Surface Processes and Ecological Regulation; Institute of Mountain Hazards and Environment; Chinese Academy of Sciences; Chengdu; 610041; China; Qinghai Provincial Key Laboratory of Restoration Ecology of Cold Area; Northwest Institute of Plateau Biology; Chinese Academy of Science; Xining; 810008; China
推荐引用方式 GB/T 7714	Chen X.,Zhang T.,Guo R.,et al. Fencing enclosure alters nitrogen distribution patterns and tradeoff strategies in an alpine meadow on the Qinghai-Tibetan Plateau[J]. 中国科学院西北生态环境资源研究院,2021,197.
APA	Chen X..,Zhang T..,Guo R..,Li H..,Zhang R..,...&Shang Z..(2021).Fencing enclosure alters nitrogen distribution patterns and tradeoff strategies in an alpine meadow on the Qinghai-Tibetan Plateau.,197.
MLA	Chen X.,et al."Fencing enclosure alters nitrogen distribution patterns and tradeoff strategies in an alpine meadow on the Qinghai-Tibetan Plateau".197(2021).