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题名: Grazing exclusion alters soil microbial respiration, root respiration and the soil carbon balance in grasslands of the Loess Plateau, northern China
作者: Li, XD(李旭东); Zhang, CP; Fu, H(傅华); Guo, D(郭丁); Song, XR; Wan, CG; Ren, JZ(任继周)
收录类别: SCIE ; BIOSIS
出版日期: 2013-12-01
刊名: SOIL SCIENCE AND PLANT NUTRITION
卷号: 59, 期号:6, 页码:877-887
出版者: TAYLOR & FRANCIS
出版地: ABINGDON
英文摘要: Grassland ecosystems are a significant component of the global carbon cycle. To better understand how grazing affects the carbon cycle of grasslands, soil microbial respiration (Rm) and root respiration (Rr), which are the main soil respiration components, we investigated with a trenching method in grazed grasslands (GG) and fenced (FG) grasslands on the Loess Plateau, northern China in 2008. The annual carbon balance in the two grasslands were also assessed and compared. After exclusion of grazing for about 3years, soil organic carbon (SOC) and microbial biomass carbon (MBC) in the surface soil increased significantly (P<0.05), resulting in the increase of Rm in most seasons. Exclusion of grazing did not change the diurnal variations of Rm, Rr and total soil respiration (Rt). Grazing decreased the temperature dependence of Rm. The annual accumulations of Rm were 165.9gCm(-2) in FG and 116.1gCm(-2) in GG. On most dates, Rr in FG was higher than in GG, but significant differences were only found in some seasons. The seasonal average value of Rr was 0.374 mu mol carbon dioxide (CO2) m(-2)s(-1) in FG, 21.0% higher than that in GG (0.309 mu mol CO2 m(-2)s(-1)). Net primary production (NPP) in FG and GG were 243.6 and 205.8gCm(-2), respectively. The annual C balance resulted in net C sequestrations of 77.7 and 89.7gC m(-2) in FG and GG, respectively, suggesting that the grassland in this region may act as a C sink both under grazing and fencing.
关键词: Carbon balance ; fenced grassland ; grazed grassland ; microbial respiration ; root respiration
作者部门: [Li, Xudong ; Zhang, Chunping ; Fu, Hua ; Guo, Ding ; Song, Xiongru ; Wan, Changgui ; Ren, Jizhou] Lanzhou Univ, Coll Pastoral Agr Sci & Technol, State Key Lab Grassland Agroecosyst, Lanzhou 730000, Peoples R China ; [Wan, Changgui] Texas Tech Univ, Dept Nat Resources Management, Lubbock, TX 79409 USA
通讯作者: Fu, H (reprint author), Lanzhou Univ, Coll Pastoral Agr Sci & Technol, State Key Lab Grassland Agroecosyst, POB 61, Lanzhou 730000, Peoples R China.
学科分类: Plant Sciences; Environmental Sciences & Ecology; Agriculture
文章类型: Article
所属项目编号: China National Key Projects for Basic Scientific Research [2014CB138703] ; Strategic Priority Research ProgramClimate Change: Carbon Budget and Related Issues [XDA05050403] ; Key Science and Technology Projects of Gansu Province [I203FKDA035] ; National Natural Science Foundation of China [31070412, 31201837] ; Fundamental Research Funds for the Central Universities [lzujbky-2013-79]
所属项目名称: 国家自然科学基金项目 ; 国家重点基础研究发展计划以及国家重大科学研究计划(973计划) ; 中央高校基本科研业务费专项资金 ; 甘肃省科技重大专项计划
项目资助者: NSFC ; MOST ; LZU ; GSSTD
语种: 英语
DOI: 10.1080/00380768.2013.862157
ISSN号: 0038-0768
WOS记录号: WOS:000328245100006
BIOSIS记录号: BIOSIS:PREV201400095295
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内容类型: 期刊论文
URI标识: http://ir.lzu.edu.cn/handle/262010/113726
Appears in Collections:草地农业科技学院_期刊论文

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Recommended Citation:
Li, XD,Zhang, CP,Fu, H,et al. Grazing exclusion alters soil microbial respiration, root respiration and the soil carbon balance in grasslands of the Loess Plateau, northern China[J]. SOIL SCIENCE AND PLANT NUTRITION,2013,59(6):877-887.
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