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Influence of vegetation type and topographic position on volumetric soil water content dynamics and similarity among surface and deep soil layers

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International soil and water Conservation Research 2023年第1期11卷 183-196页

作者： Muxing Liu Qiuyue Wang Jun Yi Hailin Zhang Ji Liu Wei Hu Key Laboratory for Geographical Process Analysis&Simulation Hubei ProvinceWuhan430079China College of Urban and Environmental Sciences Central China Normal UniversityWuhan430079China The New Zealand Institute for Plant and Food Research Limited Private Bag 4704Christchurch8140New Zealand

Clarifying the mechanisms governing volumetric soil water content(VSWC)dynamics in soil profiles is essential,as it can help to elucidate soil water transport processes and improve the prediction accuracy of soil hydrological processes.Using Spearman's rank correlation and wavelet coherence analysis methods,similarity in soil profile VSWC dynamics and factors governing VSWC soil profile dynamics in upslopes and downslopes under three vegetation types(evergreen forest[EG],secondary deciduous forest mixed with shrubs[SDFS],and deforested pasture[DP])at different time scales(hourly,daily,weekly,and monthly)and in different seasons were analyzed.The results revealed significant similarity in the VSWC of different soil depths(Psoil depth.Greater VSWC similarity was found in EG than SDFS and DP sites and in upslope than downslope areas at both forest sites.The average significant coherence area(SCA)of VSWC similarity among surface and deep soil layers varied with the time scale,which was in the order of monthly(58.6%)>weekly(42.8%)>daily(21.8%).The effects of soil properties(e.g.,texture,saturated hydraulic conductivity),rainfall,and potential evapotranspiration(ET_(p))on VSWC similarity were related to the time scale and season in which VSWC monitoring took place.soil properties had apparent effects on VSWC similarity at longer time scales(i.e.,monthly),with a high SCA.In contrast,the effects of rainfall and ET_(p) on VSWC similarity were concentrated at weekly and daily scales,with a relatively low SCA.Rainfall and ET_(p) dominated VSWC dynamics in the summer and fall,respectively.These results imply the use of measured VSWC at one soil depth to predict the VSWC at other soil depths was a reliable method.While the in-fluence of time scale effects and seasonal variations on prediction accuracy of VSWC should be considered.

关键词： volumetric soil water content Wavelet analysis Significant coherence area Time scale Vegetation type Slope postion

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soil Moisture and Oilseed Rape Yields as Affected by Configuration of Ridge-furrow Tillage in the Semiarid Region of China

Soil Moisture and Oilseed Rape Yields as Affected by Configu...

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2007中国科协年会

作者： Liu Muxing~1 Wang Jingai~(2,4) Liu Lianyou~(2,3) Yan Ping~(2,3) 1.College of City and Environment,Huazhong Normal University,Wuhan 430079,China 2.Key Laboratory of Environmental Change and Natural Disaster of Ministry of Education,Beijing Normal University,Beijing 100875,China 3.College of Resources Science & Technology,Beijing Normal University,Beijing 100875,China 4.College of Geography and Remote Sensing Sciences,Beijing Normal University,Beijing 100875,China

Ridge-furrow tillage is a kind of conservation tillage widely used for soil and water conservation in agriculture,with crop planted in ridge or furrow.The previous researches mostly focus on the effects of ridge-furrow tillage with crop planted in ridges on crop growth and soil water content,Influence of ridge-forrow tillage with crop planted in furrows are not well documented,despite it is helpful to crop growth in arid and semiarid region.The purpose of this study was evaluating the effect of ridge-furrow tillage with different surface configurations and crop planted in furrow,on the efficiency for rainwater harvesting and crop production,to determine the optimal surface configuration of ridge-furrow tillage.Two parameters of ridge heights (H) and ridge-furrow ratios (R,ratio between H and furrow width,W) were defined to determine the configuration of ridge-furrow tillage.Through field experiments,seasonal dynamic variation of volumetric soil water content, aboveground biomass and yields of oilseed rape (Brassica napus L.) were tested.The treatments included four kinds of ridge-furrow tillage with oilseed rape planted in furrow and one kind of conventional field tillage (CT) for comparison.The results indicate that relative to CT,ridge-furrow tillage increased volumetric soil water content of the plow layer (0-30 cm) by 4.2%-12.1%,decreased its fluctuation in the growing season of oilseed rope.In the soil profile under ridge-furrow tillage,soil layer with the highest soil water content appeared in the depth of 0-30 cm,which helped oilseed rape absorb water by root.The aboveground biomass,pods per plant and 1000-seed weigh under ridge-furrow tillage were larger than that under CT.By field comparison of oilseed rape yields under four forrow planting practices with 15,25 cm H and 1/6,1/12,1/24 R,we found the practice with 25 cm H and 1/24 R increased the efficiency of water harvesting,the growth and yield of the oilseed rape more obviously.Therefore,we recommend furrow-planting with 25 cm H and 1/24 R as an optima

关键词： ridge-furrow tillage furrow planting volumetric soil water content aboveground biomass theoretical yield rainfed agriculture

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