Simulated water balance of forest and farmland in the hill and gully region of the Loess Plateau in China

Wang, L.; Wang, S. P.; Shao, Hongbo; Wu, Yanqin; Wang, Q. J.

doi:10.1080/11263504.2012.709198

Cited by 18 publications

(14 citation statements)

References 46 publications

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“…Three factors were selected to represent the soil physical properties. Soil bulk density (C 7 ), soil texture (C 8 ) and soil water content (C 9 ) strongly influence plant growth and land use, and soil properties and plant recovery processes have distinct characteristics in the typical desertified sandy land of the Loess Plateau [17]. Socio-economic factors were not considered in this study because it was limited to a small watershed where such factors are generally less important than the physical ones.…”

Section: Methodsmentioning

confidence: 99%

“…The result has been soil desiccation and the development of dry soil layers because the planted trees exploited water stored in the deeper soil layers and prevented them from being recharged by rainwater [12], [7]. Consequently, once the stored water was exhausted, the limited precipitation was insufficient to maintain normal growth in the re-vegetated areas [13], leading to the vegetation dying or the production of stunted trees (colloquially referred to as “little old man trees”, which are only about 20% of the normal height for their age) [14]–[17]. Thus, implementing the SLCP policy on the Loess Plateau requires careful consideration of several factors that have a significant effect on land use change and land suitability associated with carrying out the re-vegetation program.…”

Section: Introductionmentioning

confidence: 99%

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Land Suitability Assessment on a Watershed of Loess Plateau Using the Analytic Hierarchy Process

Wang

2013

PLoS ONE

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In order to reduce soil erosion and desertification, the Sloping Land Conversion Program has been conducted in China for more than 15 years, and large areas of farmland have been converted to forest and grassland. However, this large-scale vegetation-restoration project has faced some key problems (e.g. soil drying) that have limited the successful development of the current ecological-recovery policy. Therefore, it is necessary to know about the land use, vegetation, and soil, and their inter-relationships in order to identify the suitability of vegetation restoration. This study was conducted at the watershed level in the ecologically vulnerable region of the Loess Plateau, to evaluate the land suitability using the analytic hierarchy process (AHP). The results showed that (1) the area unsuitable for crops accounted for 73.3% of the watershed, and the main factors restricting cropland development were soil physical properties and soil nutrients; (2) the area suitable for grassland was about 86.7% of the watershed, with the remaining 13.3% being unsuitable; (3) an area of 3.95 km2, accounting for 66.7% of the watershed, was unsuitable for forest. Overall, the grassland was found to be the most suitable land-use to support the aims of the Sloping Land Conversion Program in the Liudaogou watershed. Under the constraints of soil water shortage and nutrient deficits, crops and forests were considered to be inappropriate land uses in the study area, especially on sloping land. When selecting species for re-vegetation, non-native grass species with high water requirements should be avoided so as to guarantee the sustainable development of grassland and effective ecological functioning. Our study provides local land managers and farmers with valuable information about the inappropriateness of growing trees in the study area along with some information on species selection for planting in the semi-arid area of the Loess Plateau.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Land Suitability Assessment on a Watershed of Loess Plateau Using the Analytic Hierarchy Process

Wang

2013

PLoS ONE

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“…Reducing sugars were assayed by the DNS method (Wang et al 2012) and are expressed as fructose equivalents. Total reducing sugars were estimated by the same method after acid hydrolysis (pH adjusted to 2 with H 2 SO 4 ; 60 min at 1008C).…”

Section: Methodsmentioning

confidence: 99%

Direct production of bioethanol from Jerusalem artichoke inulin by gene-engineeringSaccharomyces cerevisiae6525 with exoinulinase gene

Wang

Meng

et al. 2013

Plant Biosystems - An International Journal Dealing with all As

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Jerusalem artichoke (Helianthus tuberosus L.), an important crop, containing over 50% inulin in its tubers on a dry weight basis is an agricultural and industrial crop with a great potential for production of ethanol and industrial products. Inulin is a good substrate for bioethanol production. Saccharomyces cerevisiae 6525 can produce high concentrations of ethanol, but it cannot synthesize inulinase. In this study, a new integration vector carrying inuA1 gene encoding exoinulinase was constructed and transformed into 18SrDNA site of industrial strain S. cerevisiae 6525. The obtained transformant, BR8, produced 1.1 U mL 21 inulinase activity within 72 h and the dry cell weight reached 12.3 g L 21 within 48 h. In a small-scale fermentation, BR8 produced 9.5% (v/v) ethanol, with a productivity rate of 0.385 g ethanol per gram inulin, while wild-type S. cerevisiae 6525 produced only 3.3% (v/v) ethanol in the same conditions. In a 5-L fermentation, BR8 produced 14.0% (v/v) ethanol in fermentation medium containing inulin and 1% (w/v) (NH4) 2 SO 4 . The engineered S. cerevisiae 6525 carrying inuA1 converted pure nonhydrolyzed inulin directly into high concentrations of ethanol.

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“…A key factor in the degradation of the soil is the loss of plant cover, allowing increased erosion and salinization processes to occur (Albaladejo et al 1994). The presence of vegetation in this area is important since it provides physical protection and contributes to organic matter that enhances soil water holding capacity and soil fertility characteristics (Wang et al 2012a(Wang et al , 2012bZhang et al 2013aZhang et al , 2013b.…”

Section: Introductionmentioning

confidence: 99%

“…The Yellow River Delta (YRD) is the fastest growing delta and the most active land -ocean interacting region among the large river deltas in the world (Wang et al 2012a), because the Yellow River brings great quantities of muddy sand into the Bohai Sea. YRD located at Bohai sea gulf is one of the three biggest deltas in China.…”

Section: Introductionmentioning

confidence: 99%

Photosynthetic characterization of three dominant plant species in the saline–alkaline soil of the Yellow River Delta, China

Zhang

Shao

2014

Plant Biosystems - An International Journal Dealing with all As

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The diurnal variations of photosynthesis of three dominant species, including Glycine soja, Phragmites australis, and Cynanchum chinensis, in the Yellow River Delta in China have been studied under the same natural conditions using a Li-6400 portable photosynthesis system. The results showed that the curves of diurnal variations of net photosynthetic rate (P N ) of the three plants were different. The diurnal variation of P N on C. chinensis was a midday depression pattern and had two peaks. However, P N of G. soja and P. australis showed single-peak curves. The transpiration rate (E) of G. soja was significantly higher than that of P. australis and C. chinensis, both showed single-peak curves. In general, the diurnal course of stomatal conductance (g s ) followed the same pattern of P N . A similar diurnal pattern of intercellular CO 2 concentration (C i ), vapor pressure deficit (VPD), and water use efficiency (WUE) was observed among different species. VPD showed single-peak curves, while WUE was characterized by double-peak curves, which was contrary to C i . Linear correlations among photosynthetic variables and key environmental factors indicate high positive correlations between P N and E, P N and photosynthetic active radiation, P N and leaf temperature (T leaf ), P N and VPD, and between P N and g s except C. chinensis. Negative correlations among P N and relative humidity, P N and C i were found. The irradiance response curves derived from the leaves were substantially affected by different species. C. chinensis showed highest apparent quantum efficiency, followed by P. australis and G. soja, while apparent dark respiration (R d ), convexity (k), light saturation point, and maximum gross CO 2 assimilation rate (P max ) of G. soja were higher than those of P. australis and C. chinensis. The irradiance response curve of P N and WUE of different plant species followed the same order: G. soja . C. chinensis . P. australis. They were both higher than most of other species. It was concluded that plant species adapting to the saline -alkaline habitat showed higher photosynthesis. In addition, G. soja is also effective to improve saline -alkaline soil quality.

show abstract

Simulated water balance of forest and farmland in the hill and gully region of the Loess Plateau in China

Cited by 18 publications

References 46 publications

Land Suitability Assessment on a Watershed of Loess Plateau Using the Analytic Hierarchy Process

Land Suitability Assessment on a Watershed of Loess Plateau Using the Analytic Hierarchy Process

Direct production of bioethanol from Jerusalem artichoke inulin by gene-engineeringSaccharomyces cerevisiae6525 with exoinulinase gene

Photosynthetic characterization of three dominant plant species in the saline–alkaline soil of the Yellow River Delta, China

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