Combined deep sampling and mass-based approaches to assess soil carbon and nitrogen losses due to land-use changes in karst area of southwestern China

doi:10.5194/se-7-1075-2016

CORC > 中国农业科学院 > 农业环境与可持续发展研究所 > 生态安全研究室

	Combined deep sampling and mass-based approaches to assess soil carbon and nitrogen losses due to land-use changes in karst area of southwestern China
	Hu, Yecui 1; Du, Zhangliu 2; Wang, Qibing 3; Li, Guichun 2
刊名	SOLID EARTH
	2016
卷号	7 期号:4 页码:1075-1084
ISSN号	1869-9510
DOI	10.5194/se-7-1075-2016
通讯作者	Hu, Yecui
英文摘要	The conversion of natural vegetation to human-managed ecosystems, especially the agricultural systems, may decrease soil organic carbon (SOC) and total nitrogen (TN) stocks. The objective of present study was to assess SOC and TN stocks losses by combining deep sampling with mass-based calculations upon land-use changes in a typical karst area of southwestern China. We quantified the changes from native forest to grassland, secondary shrub, eucalyptus plantation, sugarcane and corn fields (both defined as croplands), on the SOC and TN stocks down to 100 cm depth using fixed-depth (FD) and equivalent soil mass (ESM) approaches. The results showed that converting forest to cropland and other types significantly led to SOC and TN losses, but the extent depended on both sampling depths and calculation methods selected (i.e., FD or ESM). On average, the shifting from native forest to cropland led to SOC losses by 19.1, 25.1, 30.6, 36.8 and 37.9% for the soil depths of 0-10, 0-20, 0-40, 0-60 and 0-100 cm, respectively, which highlighted that shallow sampling underestimated SOC losses. Moreover, the FD method underestimated SOC and TN losses for the upper 40 cm layer, but overestimated the losses in the deeper layers. We suggest that the ESM together with deep sampling should be encouraged to detect the differences in SOC stocks. In conclusion, the conversion of forest to managed systems, in particular croplands significantly decreased in SOC and TN stocks, although the effect magnitude to some extent depended on sampling depth and calculation approach selected.
学科主题	Geochemistry & Geophysics
语种	英语
出版者	COPERNICUS GESELLSCHAFT MBH
WOS记录号	WOS:000381217200006
内容类型	期刊论文
源URL	[http://111.203.20.206/handle/2HMLN22E/19725]
专题	农业环境与可持续发展研究所_生态安全研究室
作者单位	1.China Univ Geosci, Sch Land Sci & Tech, Beijing 100083, Peoples R China 2.Chinese Acad Agr Sci, Inst Environm & Sustainable Dev Agr, Beijing 100081, Peoples R China 3.Chinese Acad Sci, Inst Bot, Beijing 100093, Peoples R China
推荐引用方式 GB/T 7714	Hu, Yecui,Du, Zhangliu,Wang, Qibing,et al. Combined deep sampling and mass-based approaches to assess soil carbon and nitrogen losses due to land-use changes in karst area of southwestern China[J]. SOLID EARTH,2016,7(4):1075-1084.
APA	Hu, Yecui,Du, Zhangliu,Wang, Qibing,&Li, Guichun.(2016).Combined deep sampling and mass-based approaches to assess soil carbon and nitrogen losses due to land-use changes in karst area of southwestern China.SOLID EARTH,7(4),1075-1084.
MLA	Hu, Yecui,et al."Combined deep sampling and mass-based approaches to assess soil carbon and nitrogen losses due to land-use changes in karst area of southwestern China".SOLID EARTH 7.4(2016):1075-1084.