干旱区生态环境知识资源中心(Arid): Contents of soil organic carbon and nitrogen in water-stable aggregates in abandoned agricultural lands in an arid ecosystem of Northwest China

Arid

	Contents of soil organic carbon and nitrogen in water-stable aggregates in abandoned agricultural lands in an arid ecosystem of Northwest China
	Wang Junqiang; Liu Lichao; Qiu Xiaoqing; Wei Yujie; Li Yanrong; Shi Zhiguo
来源期刊	Journal of Arid Land
ISSN	1674-6767
出版年	2016
卷号	8 期号:3 页码:350-363
英文摘要	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.
英文关键词	aggregate stability water-stable aggregates agricultural abandonment soil organic carbon total nitrogen northwestern China
类型	Article
语种	英语
开放获取类型	Bronze
收录类别	CSCD
WOS研究方向	Agriculture
CSCD记录号	CSCD:5688553
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/335637
作者单位	Wang Junqiang, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China.; Liu Lichao, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China.; Qiu Xiaoqing, Gansu Polytechnic College of Animal Husbandry & Engineering, Wuwei, Gansu 733006, China.; Wei Yujie, Gansu Academy of Agricultural Engineering and Technology, Wuwei, Gansu 733006, China.; Li Yanrong, Gansu Academy of Agricultural Engineering and Technology, Wuwei, Gansu 733006, China.; Shi Zhiguo, Gansu Academy of Agricultural Engineering and Technology, Wuwei, Gansu 733006, China.
推荐引用方式 GB/T 7714	Wang Junqiang,Liu Lichao,Qiu Xiaoqing,et al. Contents of soil organic carbon and nitrogen in water-stable aggregates in abandoned agricultural lands in an arid ecosystem of Northwest China[J],2016,8(3):350-363.
APA	Wang Junqiang,Liu Lichao,Qiu Xiaoqing,Wei Yujie,Li Yanrong,&Shi Zhiguo.(2016).Contents of soil organic carbon and nitrogen in water-stable aggregates in abandoned agricultural lands in an arid ecosystem of Northwest China.Journal of Arid Land,8(3),350-363.
MLA	Wang Junqiang,et al."Contents of soil organic carbon and nitrogen in water-stable aggregates in abandoned agricultural lands in an arid ecosystem of Northwest China".Journal of Arid Land 8.3(2016):350-363.