穆棱河—兴凯湖平原土壤有机碳、全氮的时空变异特征

doi:10.11720/wtyht.2022.0047

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Abstract

The soil organic carbon (SOC) and total nitrogen (TN) contents serve as the basis for sustainable agriculture and the key to soil fertility and play an important role in maintaining the soil nutrient content. Based on the soil nutrient element data obtained from the 1:250,000 land quality geochemical survey and the second national soil census, this study investigated the spatio-temporal variations in the SOC and TN contents in the surface soil of the Muling River-Xingkai Lake Plain from 1979 to 2019 using the geostatistical method and the geographic information system (GIS) technique. The results show that the SOC and TN contents in the surface soil of the study area are mainly at grade Ⅲ or above. They are rich or highly rich overall but are deficient locally. During 40 years of evolution, the SOC and TN contents decreased by 25.65% and 29.87%, respectively, and the C/N ratio increased by 6.00%. Compared with those in 1979, the SOC and TN contents in the surface soil decreased in different soil types except for paddy soil. The transition from the natural ecosystem into farmland also decreased the SOC and TN contents. These results indicate that factors such as changes in soil types and land uses have significant effects on the degree of the spatial variations in soil nutrients in the study area.

Key words： Muling River-Xingkai Lake Plain organic carbon total nitrogen spatial and temporal variation

Received: 27 January 2022 Published: 03 January 2023

ZTFLH:

P632

Corresponding Authors: LI Qiu-Yan E-mail: 343847617@qq.com;2284435292@qq.com

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	Articles by authors
	Yi-He ZHANG
	Ze YANG
	Hui-Min DAI
	Guo-Dong LIU
	Xiao-Meng HAN
	Qiu-Yan LI

Cite this article:

Yi-He ZHANG,Ze YANG,Hui-Min DAI, et al. Spatio-temporal variations in the soil organic carbon and total nitrogen contents in the Muling River-Xingkai Lake Plain[J]. Geophysical and Geochemical Exploration, 2022, 46(5): 1050-1055.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2022.0047 OR https://www.wutanyuhuatan.com/EN/Y2022/V46/I5/1050

Analytical methods and detection limits of nitrogen and organic matter in soil

Statistical characteristics of soil SOC, TN and C/N in the study area

Soil SOC, TN, C/N semi-variance function model parameters

Spatial distribution of soil SOC, TN and C/N

Distribution area and proportion of soil SOC and TN grade

Content characteristics of SOC, TN and C/N in different soil types

Changes of soil SOC, TN and C/N contents in main reclamation types

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