Dominant protozoan species in rhizosphere soil over growth of Beta vulgaris L. in Northeast China

A field study was conducted to evaluate the phytoremediation of Cd-contaminated soil utilizing the Cd hyperaccumulator Beta vulgaris var.cicla L. during one growing season (about two months) on farmland in the long-term and representative wastewater irrigation area in Northeast China. Results showed that Beta vulgaris var.cicla L. had a relatively high biomass. Planting density had a significant effect on the plant biomass and on overall Cd phytoextration efficiency. The addition of organic manure promoted the growth of Beta vulgaris var.cicla L. but inhibited the Cd removal. The Cd removal efficiency of Beta vulgaris var.cicla L. can reach 14.46 mg/m2 during one growing season, and it can be expected to achieve a higher Cd removal of the year by enhancing the planting batches. The research in this paper provided the model and technical demonstration for the large-scale phytoremediation of Cd contaminated farmland soils.

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Variation in Soil Acidity in Larch Plantations in Eastern Montane Area of Northeast China and its Effect on Soil Phosphorus Forms

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.518-523.4796 ◽

2012 ◽

Vol 518-523 ◽

pp. 4796-4800

Author(s):

Li Xin Chen ◽

Wen Biao Duan ◽

Jing Hua Wang

Keyword(s):

Northeast China ◽

Rhizosphere Soil ◽

Ph Value ◽

Organic Phosphorus ◽

Soil Phosphorus ◽

Close Correlation ◽

Larch Plantation ◽

Young Stand ◽

Mature Stand ◽

Moderately Resistant

Variations in SA in various stands of first rotation larch plantation (FRLP) at different development stages (DDS), and in young stand (YS) of second rotation larch plantation (SRLP) in eastern montane area of northeast China and the relationship between SA and various forms of OP and IP were studied. Our results demonstrated that soil active acidity (pH value, SAA) in rhizosphere soil (RS) decreased continually with increasing stand ages from YS, half-mature stand (HMS), near mature stand (NMS) to mature stand (MS), but SAA in non-rhizosphere soil (NRS), exchange acidity (EA), exchangeable aluminium (EAL), total hydrolytic acidity (THA), and the ratio of EA to THA in RS and NRS increased apparently; when SA increased, total organic phosphorus (TOP), moderately resistant organic phosphorus (MROP), and highly resistant organic phosphorus (HROP) decreased in all stands of FRLP. For all stands except in HMS, when EA in RS increased, TOP, MROP, and HROP decreased. The correlation between labile organic phosphorus (LOP) and SAA, THA in RS reached highly significant level (HSL) at P=0.01 or significant level (SL) at P=0.05, respectively. Correlation coefficient (CC) between LOP and THA in RS diminished as stand ages increased. Positive correlation between moderately liable organic phosphorus (MLOP) and SAA in RS reached SL at P=0.05 or HSL at P=0.01 in all stands. In most stands, the close correlation existed between MROP and soil potential acidity (SPA), and between HROP and SPA, respectively.

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Soil Enzyme Activity and Microbial Metabolic Function Diversity in Soda Saline–Alkali Rice Paddy Fields of Northeast China

Sustainability ◽

10.3390/su122310095 ◽

2020 ◽

Vol 12 (23) ◽

pp. 10095

Author(s):

Yunke Qu ◽

Jie Tang ◽

Zhaoyang Li ◽

Zihao Zhou ◽

Jingjing Wang ◽

...

Keyword(s):

Microbial Diversity ◽

Enzyme Activities ◽

Northeast China ◽

Soil Microorganisms ◽

Rhizosphere Soil ◽

Chemical Properties ◽

Soil Enzyme ◽

Carbon Source Utilization ◽

Rice Rhizosphere ◽

Physico Chemical

Western Jilin province has the most serious area of soda salinization in Northeast China, which affects and restricts the sustainable development of agriculture. The effects of physico-chemical properties of rhizosphere and non-rhizosphere soil on soil microbial diversity and enzyme activities (polyphenol oxidase, catalase, invertase, amylase) were evaluated in typical soda saline-alkali paddy field. Community-level physiological profile (CLPP) based on Biolog-ECO plates was used to assess the functional diversity of soil microorganisms. Exchangeable sodium percentage (ESP) and pH were negative correlated with the microbial activity (AWCD), soil enzyme activities (amylase, sucrose, and catalase, except for polyphenol oxidase) in rice rhizosphere and non-rhizosphere soil (P < 0.05). The indexes of microbial diversity in rice rhizosphere soil were significantly higher than that of non-rhizosphere soil. The utilization of amino acids by rice rhizosphere microorganisms was relatively high, while non-rhizosphere soil had relatively high utilization of carboxylic acid, phenolic acid, and amine. Among the selected physico-chemical properties, soil organic carbon (SOC) and soil water content (SWC) had the greatest influence on the variation of microbial diversity indexes and enzyme activities in rhizosphere soil. ESP and pH showed a significant positive correlation with carbon source utilization, especially for amine (AM) and phenolic acid (PA) carbon source utilization (P < 0.05) by means of RDA, and the utilization rate of AM and PA carbon sources by rice rhizosphere and non-root soil microorganisms was P1 < P2 < P3.

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