Diurnal and seasonal variations of sap flow of <i>Caragana korshinskii</i> in the arid desert region of north‐west China

Xia, Guimin; Kang, Shaozhong; Li, Fusheng; Zhang, Jianhua; Zhou, Qingyun

doi:10.1002/hyp.6690

Cited by 43 publications

(42 citation statements)

References 24 publications

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“…Different vegetation types had different evapotranspiration, which influenced the water loss from the soil. In the study area, the mean evapotranspiration rate was 4.18 mm d −1 for maize , and the value was 3.90 mm d −1 for Gansu Poplar (Chang et al, 2006) and 3.68 mm d −1 for korshinsk peashrub (Xia et al, 2008). The soil water loss rate after irrigation was higher in the cropland than that in the same soil layers of treebelt above 160 cm depth (Fig.…”

Section: Soil Water Content Differences Among Different Land Use Typesmentioning

confidence: 82%

Soil water content variations and hydrological relations of the cropland-treebelt-desert land use pattern in an oasis-desert ecotone of the Heihe River Basin, China

Shen

Gao

et al. 2014

CATENA

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This study considered the cropland-treebelt-desert system in the arid inland river basin as an entire continuum to investigate the soil water content variation and hydrological relation. For this objective, the volumetric soil water content and plant root distribution was measured to 300 cm depth along a cropland-treebelt-desert site at the oasis-desert ecotone in the Heihe River Basin, China. The results showed that the mean soil water content in the 0-200 cm layer was greater in the cropland (8.88%) than that in the treebelt (5.78%) and desert (4.37%) as a result of frequent irrigation events. However, the cropland had noticeably lower mean soil water content below 200 cm depth (14.27%), compared to treebelt (18.07%) and desert (17.30%) with deeper roots to suck up groundwater. The decline process in soil water content pulse of the cropland and treebelt after irrigation event could be well described by an exponential decay function, and the soil water loss rate was greater in the cropland (0.45-0.70%/day) than that in the treebelt (0.32-0.47%/day). The hydrological relation between treebelt and cropland in the upper soil layer was mainly occurred by treebelt root water uptake from cropland. The biomass of fine treebelt root extended into the cropland decreased logarithmically with the distance from the cropland-treebelt interface, which resulted in the smaller soil water content in the cropland with more proximity to the treebelt. The hydrological relation in the lower soil layer among cropland-treebelt-desert was caused by groundwater recharge, as cropland irrigation raised up the groundwater level to replenish the deep soil layer. The results indicated that the percolation in the cropland was an important water source for the growth of treebelt and desert plants. This study could provide scientific basis for land use pattern design and water resources management in the arid inland river basin.

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Section: Soil Water Content Differences Among Different Land Use Typesmentioning

confidence: 82%

Soil water content variations and hydrological relations of the cropland-treebelt-desert land use pattern in an oasis-desert ecotone of the Heihe River Basin, China

Shen

Gao

et al. 2014

CATENA

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“…It was hypothesized that the transpiration of urban trees was affected collectively by explanatory variables in the microclimate, air pollution, and pheno-phases of trees categories. The ordinary regression analyses in this case would have difficulty illustrating the complex interactions of explanatory variables with tree transpiration (Xia et al, 2008). Instead, we employed principal component analysis (PCA) (O'Brien et al, 2004) and the partitioning method (MacNally, 1996;Heikkinen et al, 2004;Teodoro et al, 2008) to evaluate how explanatory variables affect the transpiration of urban trees.…”

Section: Introductionmentioning

confidence: 99%

Transpiration rates of urban trees, Aesculus chinensis

Wang

Zhao

et al. 2012

Journal of Environmental Sciences

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Transpiration patterns of Aesculus chinensis in relation to explanatory variables in the microclimatic, air quality, and biological phenomena categories were measured in Beijing, China using the thermal dissipation method. The highest transpiration rate measured as the sap flux density of the trees took place from 10:00 am to 13:00 pm in the summer and the lowest was found during nighttime in the winter. To sort out co-linearity, principal component analysis and variation and hierarchical partitioning methods were employed in data analyses. The evaporative demand index (EDI) consisting of air temperature, soil temperature, total radiation, vapor pressure deficit, and atmospheric ozone (O 3 ), explained 68% and 80% of the hourly and daily variations of the tree transpiration, respectively. The independent and joint effects of EDI variables together with a three-variable joint effect exerted the greatest influences on the variance of transpiration rates. The independent effects of leaf area index and atmospheric O 3 and their combined effect exhibited minor yet significant influences on tree transpiration rates.

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“…The environmental effects on tree transpiration when evaluated by the traditional regression techniques (Xia et al, 2008) may have distorted inferences about the relative importance of explanatory variables (Heikkinen et al, 2005). The variation partitioning (Borcard et al, 1992) and hierarchical partitioning methods (MacNally, 1996) may be employed to overcome the complications caused by collinearity of experimental data.…”

Section: Introductionmentioning

confidence: 99%

Water, heat, and airborne pollutants effects on transpiration of urban trees

Wang

Ouyang

Chen

et al. 2011

Environmental Pollution

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a b s t r a c tTranspiration rates of six urban tree species in Beijing evaluated by thermal dissipation method for one year were correlated to environmental variables in heat, water, and pollutant groups. To sort out colinearity of the explanatory variables, their individual and joint contributions to variance of tree transpiration were determined by the variation and hierarchical partitioning methods. Majority of the variance in transpiration rates was associated with joint effects of variables in heat and water groups and variance due to individual effects of explanatory group were in comparison small. Atmospheric pollutants exerted only minor effects on tree transpiration. Daily transpiration rate was most affected by air temperature, soil temperature, total radiation, vapor pressure deficit, and ozone. Relative humidity would replace soil temperature when factors influencing hourly transpiration rate was considered.

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Diurnal and seasonal variations of sap flow of Caragana korshinskii in the arid desert region of north‐west China

Cited by 43 publications

References 24 publications

Soil water content variations and hydrological relations of the cropland-treebelt-desert land use pattern in an oasis-desert ecotone of the Heihe River Basin, China

Soil water content variations and hydrological relations of the cropland-treebelt-desert land use pattern in an oasis-desert ecotone of the Heihe River Basin, China

Transpiration rates of urban trees, Aesculus chinensis

Water, heat, and airborne pollutants effects on transpiration of urban trees

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