Arid
DOI10.1016/j.geoderma.2009.08.020
Effects of land use on soil total and light fraction organic, and microbial biomass C and N in a semi-arid ecosystem of northwest China
Wang, Xiao-Ling1,2; Jia, Yu1; Li, Xiao-Gang1; Long, Rui-Jun1; Ma, Qifu3; Li, Feng-Min1; Song, Ya-Jie1
通讯作者Li, Feng-Min
来源期刊GEODERMA
ISSN0016-7061
EISSN1872-6259
出版年2009
卷号153期号:1-2页码:285-290
英文摘要

There is limited information about the influence of farming systems in soil organic carbon (C), total nitrogen (N) and microbial biomass in drought-prone environments. This study aimed at comparing responses of these soil parameters to alfalfa grassland, alfalfa-crop rotations (9-year alfalfa followed by 3-year annual crops), and conventional farming (long-term annual crops) in the semiarid Loess Plateau region of northwest China. It was found that the farming systems had little effect on soil organic C (SOC), but alfalfa-crop rotations decreased soil total N (STN) by 5.9-21.7% and thus increased the SOC/STN ratio from 7.85 in alfalfa grassland to 9.63 over a period of 3 years. By comparison, a SOC/STN ratio of 11 in conventional farming was largely due to its low STN. Light fraction organic C and N in alfalfa grassland were significantly lower than in conventional farming and alfalfa-crop rotation systems. Microbial biomass C (MBC) and MBC/SOC ratio did not differ between alfalfa grassland and alfalfa-crop rotation systems, but microbial biomass N (MBN) and MBN/STN ratio were increased in alfalfa grassland. Conventional farming had lowest MBC, MBN, MBC/SCC and MBN/STN ratios. Alfalfa-crop rotations increased moisture content in the dry layers of soil profile that often occur in alfalfa grassland. As alfalfa grassland had low SOC/STN ratio and alfalfa-crop rotations increased the ratio mainly through reducing STN. a long-term practice of these two farming systems like conventional farming may not be sustainable in the dry and fragile agro-ecosystem, with annual rainfall of about 300 mm, on the semiarid Loess Plateau of northwest China. (C) 2009 Elsevier B.V. All rights reserved.


英文关键词Alfalfa grassland Alfalfa-crop rotation Conventional farming Microbial biomass Light fraction C Soil organic C Soil total N
类型Article
语种英语
国家Peoples R China ; Australia
收录类别SCI-E
WOS记录号WOS:000271094200029
WOS关键词CROPPING SYSTEMS ; LOESS PLATEAU ; CARBON ; NITROGEN ; MATTER ; FIELD ; FERTILITY ; QUALITY ; STRAW ; MAIZE
WOS类目Soil Science
WOS研究方向Agriculture
来源机构兰州大学 ; University of Western Australia
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/160755
作者单位1.Lanzhou Univ, Sch Life Sci, MOE, Key Lab Arid & Grassland Ecol, Lanzhou 730000, Gansu, Peoples R China;
2.Henan Univ Sci & Technol, Coll Agron, Luoyang 471003, Henan Province, Peoples R China;
3.Univ Western Australia, Sch Plant Biol, Crawley, WA 6009, Australia
推荐引用方式
GB/T 7714
Wang, Xiao-Ling,Jia, Yu,Li, Xiao-Gang,et al. Effects of land use on soil total and light fraction organic, and microbial biomass C and N in a semi-arid ecosystem of northwest China[J]. 兰州大学, University of Western Australia,2009,153(1-2):285-290.
APA Wang, Xiao-Ling.,Jia, Yu.,Li, Xiao-Gang.,Long, Rui-Jun.,Ma, Qifu.,...&Song, Ya-Jie.(2009).Effects of land use on soil total and light fraction organic, and microbial biomass C and N in a semi-arid ecosystem of northwest China.GEODERMA,153(1-2),285-290.
MLA Wang, Xiao-Ling,et al."Effects of land use on soil total and light fraction organic, and microbial biomass C and N in a semi-arid ecosystem of northwest China".GEODERMA 153.1-2(2009):285-290.
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