干旱区生态环境知识资源中心(Arid): Impact of grassland degradation on the distribution and bioavailability of soil silicon: Implications for the Si cycle in grasslands

Arid

DOI	10.1016/j.scitotenv.2018.12.101
	Impact of grassland degradation on the distribution and bioavailability of soil silicon: Implications for the Si cycle in grasslands
	Yang, Shilei 1; Hao, Qian 1; Liu, Hongyan 2; Zhang, Xiaodong 1; Yu, Changxun 3; Yang, Xiaomin 1; Xia, Shaopan 1; Yang, Weihua 1; Li, Jianwu 4; Song, Zhaoliang 1
通讯作者	Song, Zhaoliang
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
EISSN	1879-1026
出版年	2019
卷号	657 页码:811-818
英文摘要	Grassland ecosystems play an important role in the global terrestrial silicon (Si) cycle, and Si is a beneficial element and structural constituent for the growth of grasses. In previous decades, grasslands have been degraded to different degrees because of the drying climate and intense human disturbance. However, the impact of grassland degradation on the distribution and bioavailability of soil Si is largely unknown. Here, we investigated vegetation and soil conditions of 30 sites to characterize different degrees of degradation for grasslands in the agropastoral ecotone of northern China. We then explored the impact of grassland degradation on the distribution and bioavailability of soil Si, including total Si and four forms of noncrystalline Si in three horizons (0-10, 10-20 and 20-40 cm) of different soil profiles. The concentrations of noncrystalline Si in soil profiles significantly decreased with increasing degrees of degradation, being 7.35 +/- 0.88 mg g (1), 5.36 +/- 0.39 mg g (1), 3.81 +/- 0.37 mg g(-1) and 3.60 +/- 026 mg g(-1) in non-degraded, lightly degraded, moderately degraded and seriously degraded grasslands, respectively. Moreover, the storage of noncrystalline Si decreased from higher than 40 t ha(-1) to lower than 23 t ha(-1). The corresponding bioavailability of soil Si also generally decreased with grassland degradation. These processes may not only affect the Si pools and fluxes in soils but also influence the Si uptake in plants. We suggest that grassland degradation can significantly affect the global grassland Si cycle. Grassland management methods such as fertilizing and avoiding overgrazing can potentially double the content and storage of noncrystalline Si in soils, thereby enhancing the soil Si bioavailability by > 17%. (C) 2018 Elsevier B.V. All rights reserved.
英文关键词	Silicon cycle Bioavailability Grassland degradation Agro-pastoral ecotone Northern China
类型	Article
语种	英语
国家	Peoples R China ; Sweden
收录类别	SCI-E
WOS记录号	WOS:000455903400079
WOS关键词	PHYTOLITH CARBON SEQUESTRATION ; INNER MONGOLIAN STEPPE ; ALPINE GRASSLAND ; CHINA GRASSLANDS ; SANDY GRASSLAND ; PLANT COMMUNITY ; ORGANIC-MATTER ; DESERTIFICATION ; VEGETATION ; NITROGEN
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
来源机构	北京大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/218647
作者单位	1.Tianjin Univ, Inst Surface Earth Syst Sci, Tianjin 300072, Peoples R China; 2.Peking Univ, Coll Urban & Environm Sci, Beijing 100871, Peoples R China; 3.Linnaeus Univ, Dept Biol & Environm Sci, SE-39182 Kalmar, Sweden; 4.Zhejiang Agr & Forestry Univ, Sch Environm & Resource Sci, Linan 311300, Zhejiang, Peoples R China
推荐引用方式 GB/T 7714	Yang, Shilei,Hao, Qian,Liu, Hongyan,et al. Impact of grassland degradation on the distribution and bioavailability of soil silicon: Implications for the Si cycle in grasslands[J]. 北京大学,2019,657:811-818.
APA	Yang, Shilei.,Hao, Qian.,Liu, Hongyan.,Zhang, Xiaodong.,Yu, Changxun.,...&Song, Zhaoliang.(2019).Impact of grassland degradation on the distribution and bioavailability of soil silicon: Implications for the Si cycle in grasslands.SCIENCE OF THE TOTAL ENVIRONMENT,657,811-818.
MLA	Yang, Shilei,et al."Impact of grassland degradation on the distribution and bioavailability of soil silicon: Implications for the Si cycle in grasslands".SCIENCE OF THE TOTAL ENVIRONMENT 657(2019):811-818.