Effects of the sampling spacing on the spatial variability in soil organic carbon, total nitrogen, and total phosphorus across a semiarid watershed

doi:10.1080/03650340.2020.1795641

IEECAS OpenIR > 生态环境研究室

	Effects of the sampling spacing on the spatial variability in soil organic carbon, total nitrogen, and total phosphorus across a semiarid watershed
	Zhang, Pingping 1,2; Wang, Yunqiang 1,2,3; Zhang, Xingchang 4,5
通讯作者	Wang, Yunqiang(wangyq@ieecas.cn)
	2020-07-26
发表期刊	ARCHIVES OF AGRONOMY AND SOIL SCIENCE
ISSN	0365-0340
页码	16
摘要	Estimating coefficient of variation (CV) and semi-variogram from sample data requires an appropriate sampling spacing. Although some recommendations on the optimal spacings exist, they focused on the simulated random fields. We collected surface soil (0-20 cm) samples from 689 sites based on a regular grid of 100 x 100 m in the Liudaogou watershed (6.89 km(2)) on the Loess Plateau, China. We grouped the samples by re-sampling at six sampling spacings (100, 200, 300, 400, 500, and 600 m) to determine the characteristic changes in the spatial variability. The mean and CV values varied little among the different spacings (p< 0.05). The sampling spacing can be increased to 300 m if we want to know the possible relationships between OC, TN, and TP with the environmental factors. OC and TN were fitted best by the spherical model whereas TP was fitted best with an exponential model. The optimal model type unchanged as the spacing increased. The apparent parameters of semi-variogram did not differ from their true values when the spacing was less than 200 m for most cases (p< 0.05). Therefore, the spacing should not be greater than 200 m in order to clarify their spatial structures.
关键词	Geostatistics maximum sampling distance sampling strategy scale spatial heterogeneity
DOI	10.1080/03650340.2020.1795641
关键词[WOS]	REGIONALIZED VARIABLES ; LOCAL ESTIMATION ; DESIGN ; VARIOGRAM ; SCALE ; INTERPOLATION ; GEOSTATISTICS ; ATTRIBUTES ; PREDICTION ; SCHEMES
收录类别	SCI ; SCI
语种	英语
资助项目	'Ten Thousand Talent Program' for Young top-notch talent ; National Natural Science Foundation of China[41722106] ; National Natural Science Foundation of China[41971045]
WOS研究方向	Agriculture
项目资助者	'Ten Thousand Talent Program' for Young top-notch talent ; National Natural Science Foundation of China
WOS类目	Agronomy ; Soil Science
WOS记录号	WOS:000552561100001
出版者	TAYLOR & FRANCIS LTD
引用统计
文献类型	期刊论文
条目标识符	http://ir.ieecas.cn/handle/361006/15204
专题	生态环境研究室第四纪科学与全球变化卓越创新中心
通讯作者	Wang, Yunqiang
作者单位	1.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 71006, Shaanxi, Peoples R China 2.CAS Ctr Excellence Quaternary Sci & Global Change, Xian, Peoples R China 3.Beijing Normal Univ, Interdisciplinary Res Ctr Earth Sci Frontier, Beijing, Peoples R China 4.Chinese Acad Sci & Minist Water Resources, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling, Shaanxi, Peoples R China 5.Grad Univ Chinese Acad Sci, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Pingping,Wang, Yunqiang,Zhang, Xingchang. Effects of the sampling spacing on the spatial variability in soil organic carbon, total nitrogen, and total phosphorus across a semiarid watershed[J]. ARCHIVES OF AGRONOMY AND SOIL SCIENCE,2020:16.
APA	Zhang, Pingping,Wang, Yunqiang,&Zhang, Xingchang.(2020).Effects of the sampling spacing on the spatial variability in soil organic carbon, total nitrogen, and total phosphorus across a semiarid watershed.ARCHIVES OF AGRONOMY AND SOIL SCIENCE,16.
MLA	Zhang, Pingping,et al."Effects of the sampling spacing on the spatial variability in soil organic carbon, total nitrogen, and total phosphorus across a semiarid watershed".ARCHIVES OF AGRONOMY AND SOIL SCIENCE (2020):16.