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	Ecological safe management of terraced rice paddy landscapes
	Lennartz, B.1; Horn, R.2; Duttmann, R.3; Gerke, H. H.4; Tippkoetter, R.5; Eickhorst, T.5; Janssen, I.4; Janssen, M.1; Rueth, B.1; Sander, T.4
刊名	SOIL & TILLAGE RESEARCH
	2009-03-01
卷号	102期号:2页码:179-192
关键词	Paddy soil Rice production Scale transition Soil regionalization Soil hydraulic properties Preferential flow Microhabitat
ISSN号	0167-1987
DOI	10.1016/j.still.2008.07.010
通讯作者	Lennartz, B.(bernd.lennartz@uni-rostock.de)
英文摘要	Ecological safe management of rice paddy landscapes is in focus of a joint research project comprising five German working groups and Chinese partners. The project is aiming at characterizing the scale-depending structures and processes of agricultural landscape of terraced paddy fields in southeast China. The specific objectives were the enlightenment of the linkage between remote sensible information and the spatial distribution of soil features, as well as soil structural processes and their relation to vertical and lateral water losses and solute leaching. The experimental watershed is located in southeast China. The soils which either developed from quaternary clay or red sandstone exhibit a (man-made) layered structure with three hydraulic-functional horizons: puddled layer, plough pan and the (water unsaturated) subsoil. The analysis of soil texture and selected chemical parameters on the catenary and catchment scale confirmed that even in old terraced and thoroughly modified landscapes, the original structures (unaffected by man) of catenary soil property distributions persist. Thus, the application of coregionalization techniques incorporating topographical attributes as explaining variables was found to be suitable to characterize soil property distributions on both the catenary and the catchment scale. On-site field scale investigations revealed that paddy soils exhibit a dynamic soil-water system which is driven by the mechanical seed bed preparation (puddling) on the one hand and drying and wetting cycles including ponded/flooded periods on the other. It was found that the hydraulic properties depend mainly on the duration of cultivation as a rice paddy. In contrast to earlier studies, we found that a further decrease in the Saturated hydraulic conductivity of the plough pan may still occur after 20 years. Even in older rice paddies, however, water losses may be significant mainly because of ineffective functioning of the surrounding bunds. Pedon and aggregate investigations demonstrated the pronounced dual porosity nature of the paddy soils with a macropor network consisting of cracks and biopores penetrating both the plough pan and the bunds. The shrinkage potential of the puddle layer was higher in older paddy fields than in younger ones while it was vice versa for soil from the plough pan. Swelling and shrinkage affected also the living conditions for soil microorganisms especially after drainage when the habitable pore space was significantly reduced. Pore scale and micro-biological investigations revealed that drainage induced stress reduced micro-biodiversity and decreased abundances of soil inhabiting microorganisms. In addition to newly proposed management strategies with recurrent wetting and drying cycles, we suggest maintaining (saturated) equilibrium conditions over longer periods to reduce soil structural dynamics and the risks of water losses and chemical leaching involved with preferential flow. (C) 2008 Elsevier B.V. All rights reserved.
收录类别	SCI ; ISTP
WOS关键词	SOIL CHEMICAL-PROPERTIES ; PERCOLATION LOSSES ; SPATIAL VARIABILITY ; PHYSICAL-PROPERTIES ; PREFERENTIAL FLOW ; SHRINKAGE CURVE ; IRRIGATED RICE ; WATER-BALANCE ; FIELD-SCALE ; CLAY SOIL
WOS研究方向	Agriculture
WOS类目	Soil Science
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000264225400003
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2558784
专题	南京土壤研究所
通讯作者	Lennartz, B.
作者单位	1.Univ Rostock, Inst Land Use, Rostock, Germany 2.Univ Kiel, Inst Plant Nutr & Soil Sci, D-2300 Kiel, Germany 3.Univ Kiel, Inst Geog, Dept Landscape Ecol & Geoinformat Sci, Kiel, Germany 4.Leibniz Ctr Agr Landscape Res ZALF, Inst Soil Landscape Res, Muncheberg, Germany 5.Univ Bremen, Inst Soil Sci, Bremen, Germany 6.Chinese Acad Sci, Inst Soil Sci, Nanjing 210093, Peoples R China
推荐引用方式 GB/T 7714	Lennartz, B.,Horn, R.,Duttmann, R.,et al. Ecological safe management of terraced rice paddy landscapes[J]. SOIL & TILLAGE RESEARCH,2009,102(2):179-192.
APA	Lennartz, B..,Horn, R..,Duttmann, R..,Gerke, H. H..,Tippkoetter, R..,...&Zhang, B..(2009).Ecological safe management of terraced rice paddy landscapes.SOIL & TILLAGE RESEARCH,102(2),179-192.
MLA	Lennartz, B.,et al."Ecological safe management of terraced rice paddy landscapes".SOIL & TILLAGE RESEARCH 102.2(2009):179-192.

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