Progress in the remediation of hazardous heavy metal-polluted soils by natural zeolite

Shi, Weiyu; Shao, Hongbo; Li, Hua; Shao, Mingan; Du, Sheng

doi:10.1016/j.jhazmat.2009.04.097

Cited by 260 publications

(112 citation statements)

References 73 publications

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“…After 15 years of enclosure, environmental factors and litter layer (litter thickness reaches 3-5 cm) lead to bad soil aeration which influences the renewal seedling, forage regeneration, and finally the stability of the system. Bad soil aeration directly inhibits the normal growth and development of grass and the formation of species diversity leading to the decline of natural regeneration of grassland and remarkable decrease in biomass [25][26][27][28][29][30]. Species composition of plant community is an important symbol of grassland community property, structure, and function.…”

Section: Discussionmentioning

confidence: 99%

“…Human activities, such as cutting and grazing, are considered as the most influential factors affecting grassland habitat by obviously influencing the composition and structure of grassland species diversity [18][19][20][21][22][23][24][25][26][27][28][29][30]. A seven-year research of short forage grassland shows that heavy grazing can reduce total grass production by about 40% in growth season from June to July, and the highest production can be obtained by heavy grazing in the late growth season [2,3,27,28]. In this study, heavy grazing reduces total grass production by about 30-45% in semiarid area in growth season from June to July.…”

Section: Discussionmentioning

confidence: 99%

“…Plant compensatory growth can be decided by the net effect of inhibition and promotion, which relates to the community type, stocking rate, environment condition, and grazing history [5]. Domestic and foreign studies on plant compensatory growth mostly focus on theory and model, and the study through comprehensive and systematic experiment is very much limited [15,[25][26][27][28][29]. …”

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confidence: 99%

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Dynamic Changes of Stipa bungeana Steppe Species Diversity as Better Indicators for Soil Quality and Sustainable Utilization Mode in Yunwu Mountain Nature Reserve, Ningxia, China

Cheng

et al. 2011

CLEAN Soil Air Water

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Due to serious degradation of typical Stipa bungeana steppe community on the Loess Plateau, a 26-year (1982-2007) experiment has been carried out by methods of forbidden grazing, cutting, and rotational grazing. Our results show that the process of succession of long-term enclosed S. bungeana community can be divided into two stages: 1980-1996, the forward succession stage, when the species diversity and biomass reach the peak (33.7 species/m 2 and 1349.41 g/m 2 , respectively); 1997-2007, the slow succession stage, when the gradually thickening of litter layer (litter depth reaches 3-5 cm) directly causes the reduction of species diversity and biomass to 19.1 species/m 2 and 863.19 g/m 2 , respectively. While under the cutting and rotational grazing methods, grassland succession can be divided into four stages: 1st-5th year, the continuing growth stage; 6th-9th year, the vigorous competing stage; 10th-15th year, the aggregation growth stage of constructive species with biomass reaching the peak (1444.19 g/m 2 ); and 16th-23rd year, stable growth stage of constructive species, which form sub-climax and are eventually dominated by S. bungeana, with the species diversity and biomass of 25-27 species/m 2 and 956.76-1165.35 g/m 2 , respectively. The constructive species suddenly change in the 24th year, and the population of S. grandis increases rapidly to 21 m À2 accounting for 25% of the total plant population. Long-term enclosure leads to decreased species diversity and biomass and is not beneficial for grassland renewing. The species diversity and biomass of degraded grassland continuously decrease to 10 species/m 2 and 392.1 g/m 2 due to long-term artificial failure and transitionally grazing, leading to harden soil with slow rainfall infiltration, where plants can only sustain life under the drought condition. Therefore, reasonable cutting and rotational grazing are the methods of choice for the gradual increase of species diversity and promotion of the natural renewal and forward succession of the grassland on Loess Plateau. These results provide reliable information for the diversity dynamic change as better indictors of soil quality and sustainable utilization mode.Keywords: Nature reserve; Soil quality; Species diversity dynamics; Stipa bungeana steppe; Sustainable utilization mode IntroductionGrassland is one of the globally important terrestrial ecosystems, and the increase in species diversity and productivity of grassland community depends greatly on the long-term management [1][2][3][4][5][6][7]. More research indicates that the species diversity of grassland has important ecology functions [8][9][10][11][12], species diversity is positively related to productivity, especially aboveground biomass [13][14][15]. Stipa bungeana steppe is a major community of middle temperate semi-arid typical grassland in the Eurasian section, widely distributes in western China and Loess Plateau region, and is mainly used for grazing and cutting. Typical grassland has important position in the temperate steppe in Chin...

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

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Dynamic Changes of Stipa bungeana Steppe Species Diversity as Better Indicators for Soil Quality and Sustainable Utilization Mode in Yunwu Mountain Nature Reserve, Ningxia, China

Cheng

et al. 2011

CLEAN Soil Air Water

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“…An ideal plant for application in phytoextraction should have a high metal tolerance and a high metal accumulation capacity in its harvestable parts (Shi et al 2009). Most of the terrestrial hyperaccumulators of As identified thus far are pteriod ferns, including the well-known P. vittata (Ma et al 2001;Zhao et al 2009).…”

Section: Arsenic In Plantsmentioning

confidence: 99%

Arsenic in soil and vegetation of a contaminated area

Karimi

Ghaderian

2013

Int. J. Environ. Sci. Technol.

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Plant and soil samples were collected from one uncontaminated and four contaminated sites (in the Dashkasan mining area western Iran). Total and water-soluble arsenic in the soil ranged from 7 to 795 and from 0.007 to 2.32 mg/kg, respectively. The highest arsenic concentration in soil was found at the ore dressing area (up to 1,180 mg/kg) and lowest at an uncontaminated area (up to 11 mg/kg). A total of 49 plant species belonging to 15 families were collected from four sampling sites. A significant positive correlation was detected between the concentrations of arsenic in plant dry matter and those in soils. The highest arsenic concentrations were found in Hyoscyamus kurdicus Bornm. (up to 205 mg/kg) and Helichrysum oligocephalum DC. (up to 162 mg/kg). These two accumulator species could have potential for soil clean-up by phytoextraction. The data have been compared with those for the Zarshuran mining area (north-western Iran) obtained in a former study.

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“…The widespread use of sewage sludge, waste waters, pesticide in agriculture and the emissions of vehicle exhausts, mining, and smelting has resulted in large accumulation of heavy metals in soils (Shi et al 2009;Dede et al 2012). While it is believed that soil contamination with cadmium (Cd) is the most serious health risk, Cd is likely to be accumulated into the soil surface under the influence of human activities (Kabata-pendias 2011).…”

Section: Introductionmentioning

confidence: 99%

Chelate-assisted phytoextraction of cadmium from a mine soil by negatively charged sunflower

Tahmasbian

Sinegani

2013

Int. J. Environ. Sci. Technol.

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The effects of some chelating agents and electricity on cadmium phytoextraction from a mine soil were examined in pot culture of sunflower to achieve more remediation efficiency. At the beginning of the flowering stage, ethylene-diamine-tetra-acetic acid (EDTA) as a chemical chelator, cow manure extract (CME) and poultry manure extract (PME) as organic chelators were applied (2 g kg -1 soil) during irrigation. Seven days later, Helianthus annuus was negatively charged by inserting a stainless steel needle in the lowest part of the stem with 10 and 30 V direct current electricity for 1 h each day for 14 days. Afterward, concentration of cadmium in roots and shoots, cadmium translocation factor (TF), cadmium uptake index (UI) and soil available (diethylene-triaminepenta-acetic acid extractable) cadmium were measured. Results indicated that EDTA reduced roots dry weight while none of the roots and shoots was affected by other chelating agents and by electrical treatment as well. Highest concentration of cadmium in shoots was measured in 10 V-control with no significant differences with 30 V-PME and 30 V-EDTA. Utilization of chelating agents did not increase the cadmium TF and cadmium UI while highest values for cadmium TF and cadmium UI were observed in 10 and 30 V treatments, respectively. Available cadmium in the soil near root system treated with 10 and 30 V was relatively lower compared with the soil far from root system. Results of this experiment indicated that charging the plant with direct current electricity ameliorated the efficiency of cadmium phytoremediation.

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Progress in the remediation of hazardous heavy metal-polluted soils by natural zeolite

Cited by 260 publications

References 73 publications

Dynamic Changes of Stipa bungeana Steppe Species Diversity as Better Indicators for Soil Quality and Sustainable Utilization Mode in Yunwu Mountain Nature Reserve, Ningxia, China

Dynamic Changes of Stipa bungeana Steppe Species Diversity as Better Indicators for Soil Quality and Sustainable Utilization Mode in Yunwu Mountain Nature Reserve, Ningxia, China

Arsenic in soil and vegetation of a contaminated area

Chelate-assisted phytoextraction of cadmium from a mine soil by negatively charged sunflower

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