Long-term impact of farming practices on soil organic carbon and nitrogen pools and microbial biomass and activity

ISWC OpenIR > 水保所知识产出(1956---)

	Long-term impact of farming practices on soil organic carbon and nitrogen pools and microbial biomass and activity
	Wang Yi; Tu Cong; Cheng Lei; Hu, SJ
	2011
发表期刊	SOIL & TILLAGE RESEARCH
卷号	117 期号:NO 页码:8-16
摘要	Conventional agriculture with intensive tillage and high inputs of synthetic chemicals has critically depleted the soil C pools. Alternative practices such as no-tillage and organic inputs have been shown to increase soil C content. However, the long-term impact of these practices on soil C pools was not fully understood under humid and warm climate conditions such as the southeast USA. We hypothesized that a combination of sustainable production practices will result in greater microbial biomass and activity and soil organic C than any individual practice. To test this hypothesis, we conducted a long-term experiment examining how different farming practices affect soil C and N pools and microbial biomass and activities in a fine-sandy loam (FAO: Acrisol) in the southern Appalachian mountains of North Carolina, USA. The experiment was a randomized complete design with four replications. Six management treatments, i.e., tillage with no chemical or organic inputs (Control, TN), tillage with chemical inputs (TC), tillage with organic inputs (TO), no-tillage with chemical inputs (NC), no-tillage with organic inputs (NO), and fescue grasses (FG), were designed. Organic C and N pools and microbial properties in 0-15 cm soils were markedly different after 15 years of continuous treatments. Both no tillage and organic inputs significantly promoted soil microbial biomass by 63-139% and 54-126%; also microbial activity increased by 88-158% and 52-117%, respectively. Corresponding increases of soil organic C by 83-104% and 19-32%, and soil organic N by 77-94% and 20-32% were measured. The combination of no tillage and organic management increased soil organic C by 140% over the conventional tillage control, leading to a soil C content comparable to an un-disturbed grassland control. No tillage reduced the proportion of organic C in the light fraction with d < 1.0 g cm(-3) (from 1.53-3.39% to 0.80-1.09%), and increased the very heavy fraction with d > 1.6 g cm(-3) (from 95% to 98%). Organic inputs, however, had little impact on C distribution among different density fractions of the soil except light fraction in tillage treatment. Over all, no-tillage practices exerted greater influence on microbial biomass levels and activity and soil organic C levels and fractionations than organic inputs. Our results support the hypothesis and indicate that management decisions including reducing tillage and increasing organic C inputs can enhance transformation of soil organic C from the labile into stable pools, promote soil C accumulation, improve soil fertility and while mitigate atmospheric CO(2) rise. (C) 2011 Elsevier B.V. All rights reserved.
关键词	Microbial c And n Microbial Respiration Reduced Tillage Soil c Fractions Soil c And n Pools Sustainable Farming Practice
收录类别	SCI
语种	英语
文献类型	期刊论文
条目标识符	sbir.nwafu.edu.cn/handle/361005/4664
专题	水保所知识产出(1956---)
通讯作者	Hu, SJ
推荐引用方式 GB/T 7714	Wang Yi,Tu Cong,Cheng Lei,et al. Long-term impact of farming practices on soil organic carbon and nitrogen pools and microbial biomass and activity[J]. SOIL & TILLAGE RESEARCH,2011,117(NO):8-16.
APA	Wang Yi,Tu Cong,Cheng Lei,&Hu, SJ.(2011).Long-term impact of farming practices on soil organic carbon and nitrogen pools and microbial biomass and activity.SOIL & TILLAGE RESEARCH,117(NO),8-16.
MLA	Wang Yi,et al."Long-term impact of farming practices on soil organic carbon and nitrogen pools and microbial biomass and activity".SOIL & TILLAGE RESEARCH 117.NO(2011):8-16.

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