气候变化领域集成服务门户(CCPortal): Effects of winter grazing and N addition on soil phosphorus fractions in an alpine grassland on the Qinghai-Tibet Plateau

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DOI	10.1016/j.agee.2023.108700
	Effects of winter grazing and N addition on soil phosphorus fractions in an alpine grassland on the Qinghai-Tibet Plateau
	Guan, Zhen-Huan; Cao, Zuonan; Li, Xiao Gang; Kuehn, Peter; Hu, Guozheng; Scholten, Thomas; Zhu, Jianxiao; He, Jin-Sheng
发表日期	2023
ISSN	0167-8809
EISSN	1873-2305
卷号	357
英文摘要	Nutrient cycling in alpine grasslands is susceptible to climate change and anthropogenic activities, which can affect soil phosphorus (P) availability. Despite the crucial role of soil P availability in maintaining stability and productivity of grassland ecosystems, limited research has been conducted on the effects of nitrogen (N) addition and winter grazing on P transformation on the Qinghai-Tibet Plateau. In an 8-year experiment, we applied four different N addition rates (0, 25, 50, and 100 kg urea ha � 1 year- 1) in combination with winter grazing to investigate the effects of N addition and winter grazing on the soil P fractions. The results reveal that increasing the N addition gradually reduced the resin-Pi and NaOH-Pi contents in the soil by increasing the plant P uptake and promoting the release of carboxylates in the rhizosheath, regardless of grazing. Winter grazing decreased the NaHCO3-Pi and NaOH-Pi contents compared with the no-grazing treatment by increasing the P uptake of the plants. In contrast, neither grazing nor N addition affected the HClconc.-P or residual-P content. In the no-grazing plots, the soil NaHCO3-Po content exhibited a gradual increase in response to N addition, whereas N addition had no discernible effect on the NaOH-Po content. In the grazing plots, the NaHCO3- and NaOH-Po contents gradually decreased with N addition, which was associated with the increased acid phosphatase activity in the rhizosheath and the export of forage. Thus, we conclude that N addition promotes the dissolution of NaOH-Pi to more available inorganic P forms. Under winter grazing conditions only, the transformation of P from inorganic to organic forms gradually decreased with increasing N additions.
关键词	Alpine grasslands Nitrogen addition Soil phosphorus fractions Winter grazing
英文关键词	DIFFERENT PLANT AVAILABILITY; MICROBIAL BIOMASS; NITROGEN ADDITION; CARBOXYLATE COMPOSITION; ENZYMATIC-ACTIVITIES; FOREST SOILS; ROOT; RESPONSES; CATTLE; TRANSFORMATIONS
WOS研究方向	Agriculture, Multidisciplinary ; Ecology ; Environmental Sciences
WOS记录号	WOS:001067500500001
来源期刊	AGRICULTURE ECOSYSTEMS & ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283303
作者单位	Lanzhou University; Lanzhou University; Eberhard Karls University of Tubingen; Chinese Academy of Agricultural Sciences; Institute of Environment & Sustainable Development in Agriculture, CAAS; Peking University
推荐引用方式 GB/T 7714	Guan, Zhen-Huan,Cao, Zuonan,Li, Xiao Gang,et al. Effects of winter grazing and N addition on soil phosphorus fractions in an alpine grassland on the Qinghai-Tibet Plateau[J],2023,357.
APA	Guan, Zhen-Huan.,Cao, Zuonan.,Li, Xiao Gang.,Kuehn, Peter.,Hu, Guozheng.,...&He, Jin-Sheng.(2023).Effects of winter grazing and N addition on soil phosphorus fractions in an alpine grassland on the Qinghai-Tibet Plateau.AGRICULTURE ECOSYSTEMS & ENVIRONMENT,357.
MLA	Guan, Zhen-Huan,et al."Effects of winter grazing and N addition on soil phosphorus fractions in an alpine grassland on the Qinghai-Tibet Plateau".AGRICULTURE ECOSYSTEMS & ENVIRONMENT 357(2023).