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Contents of soil organic carbon and nitrogen in water-stable aggregates in abandoned agricultural lands in an arid ecosystem of Northwest China

Content Provider	Springer Nature Link
Author	Liu, Lichao Qiu, Xiaoqing Wei, Yujie Shi, Zhiguo Li, Yanrong Wang, Junqiang
Copyright Year	2016
Abstract	Soil organic matter content in water-stable aggregates (WSA) in the arid ecosystems (abandoned agricultural lands especially) of China is poorly understood. In this study, we examined the WSA sizes and stability, and soil organic carbon (OC) and nitrogen (N) contents in agricultural lands with abandonment ages of 0, 3, 12, 20, 30 and 40 years, respectively, in the Minqin Oasis of Northwest China. The total soil OC and N contents at depths of 0–20, 20–40 and 40–60 cm in abandoned agricultural lands were compared to those in cultivated land (the control). Agricultural land abandonment significantly (P<0.05) influenced the distribution of MWD (mean weight diameter), and OC and N contents. There were significant increases in MWD and the proportion of macroaggregates (sizes >0.25 mm) as the age of agricultural land abandonment increased. The effect of abandonment ages of agricultural lands on MWD was determined by the changes of OC and N accumulation in WSA sizes >2 mm. The total OC and N contents presented a stratification phenomenon across soil depths in this arid ecosystem. That is, both of them decreased significantly at depths of 0–20 and 40–60 cm while increased at the depth of 20–40 cm. The WSA sizes <0.053 mm had the highest soil OC and N contents (accounting for 51.41%–55.59% and 42.61%–48.94% of their total, respectively). Soil OC and N contents in microaggregates (sizes 0.053–0.25 mm) were the dominant factors that influenced the variations of total OC and N contents in abandoned agricultural lands. The results of this study suggested that agricultural land abandonment may result in the recovery of WSA stability and the shifting of soil organic matter from the silt+clay (<0.053 mm) and microaggregate fractions to the macroaggregate fractions. However, agricultural land abandonment did not increase total soil OC and N contents in the short-term.
Starting Page	350
Ending Page	363
Page Count	14
File Format	PDF
ISSN	16746767
Journal	Journal of Arid Land
Volume Number	8
Issue Number	3
e-ISSN	21947783
Language	English
Publisher	Science Press
Publisher Date	2016-01-27
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	agricultural abandonment northwestern China Sustainable Development Physical Geography aggregate stability water-stable aggregates soil organic carbon total nitrogen Plant Ecology
Content Type	Text
Resource Type	Article
Subject	Earth-Surface Processes Water Science and Technology Management, Monitoring, Policy and Law

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