Soil microbial properties under different grain-for-green patterns in depressions between karst hills

Shiyang, 鹿士杨 Lu; Wanxia, 彭晚霞 Peng; Tongqing, 宋同清 Song; Fuping, 曾馥平 Zeng; Hu, 杜虎 Du; Kelin, 王克林 Wang

doi:10.5846/stxb201103070271

Cited by 2 publications

(2 citation statements)

References 4 publications

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“…Our study was conducted at Guzhou Village (24 • 50'N, 107 • 55'E), Huanjiang County, Guangxi Province, China, which has typical karst ecosystems. This region has a subtropical monsoon climate with a mean annual precipitation of 1,389 mm and a mean annual temperature between 16.5 • C and 20.5 • C. The calcareous soil developed from a limestone base (Lu et al, 2012). The Guzhou catchment was extremely disturbed by deforestation and cultivation.…”

Section: Study Area and Samplingmentioning

confidence: 99%

“…Thus, when planting Guimu-1 elephant grass, phosphate fertilizer was needed. The Zenia insignis site had relatively low soil nutrients (Figure 1) due to the consumption of a considerable amount of phosphorus (Lu et al, 2012) and necessitated soil fertilization management. The Citrus reticulate and abandoned cropland sites had the worst edaphic effect (Figure 1), and the introduction of other plant species was considered to hasten ecological restoration.…”

Section: Soil Bacterial Community Under Revegetationmentioning

confidence: 99%

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Effect of Different Grain for Green Approaches on Soil Bacterial Community in a Karst Region

Chen

Peng

et al. 2020

Front. Microbiol.

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Soil bacteria participate in nutrient cycling above and below ground to promote ecosystem stability and health. However, the relationship of soil bacteria and environmental factors following the Grain for Green (GfG) program remains poorly understood in southwest China. Soil samples were collected from seven Grain for Green sites that had been revegetated for 15 years. Four of these sites were afforested with a different tree species: Zenia insignis (ZI), Toona sinensis (TS), Castanea mollissima (CM), and Citrus reticulate (CR). One site was revegetated with Zenia insignis and Guimu-1 elephant grass (ZG), and one with only Guimu-1 elephant grass (GM). The remaining site, abandoned cropland (AC), was left to regenerate naturally. Here, we used Illumina sequencing of 16S rRNA genes to explore how the Grain for Green project affected soil bacterial community. We found that Actinobacteria, Proteobacteria, Chloroflexi, and Acidobacteria were the dominant phyla in these soils. The dominant genera at each revegetation site were also different. The CM, ZI, TS, and AC sites were dominated by Micromonospora, ZG was dominated by Streptomyces, and CR and GM were dominated by Subgroup 6. The bacterial structure was most similar in AC and TS. Correlation analysis showed that the ratio of C:P had positive effects on KD4-96, Intrasporangiaceae, and Gaiella. The ratio of soil N:P was significantly positively correlated with Cupriavidus and Kribbella. The combination of planting Zenia insignis and Guimu-1 elephant grass had the best edaphic benefits, and the approach of planting Citrus reticulate and Toona sinensis needs to be improved. Redundancy analysis (RDA) revealed that plant Simpson index, and soil N:P contributed to 16 and 15.7% of the total variations in the soil bacterial community composition, respectively. Our results suggested that plant diversity (Simpson index) and soil stoichiometric ratio (N:P) were the important factors affecting the bacterial community, and phosphorus was the limiting factor of the bacterial community in the Grain for Green karst region. In the future, revegetation should be accompanied with phosphorus fertilizer and polycultures should be considered.

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Section: Study Area and Samplingmentioning

confidence: 99%

Section: Soil Bacterial Community Under Revegetationmentioning

confidence: 99%

Effect of Different Grain for Green Approaches on Soil Bacterial Community in a Karst Region

Chen

Peng

et al. 2020

Front. Microbiol.

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Soil labile organic carbon fractions in rhizosphere soil in citrus plantations in the Three Gorges Reservoir Area

et al. 2015

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Rhizosphere carbon sequestration plays a crucial role in soil carbon dynamics. Little information is available on the dynamics of rhizosphere soil labile organic carbon fractions compared with bulk soil at different citrus stand age. Two replicate sites of three stand ages (10-, 20-, and 30-year) of citrus in the Three Gorges Reservoir area of China were studied. The results showed that rhizosphere soil organic carbon has an increases of 18.76 % under 20-year stand and 11.09 % under 30-year stand compared with bulk soil (P \ 0.05), respectively. The dissolved organic C of rhizosphere soil was 31.32, 19.57 and 31.81 % higher compared with bulk soil under 10-, 20-to 30-year stands (P \ 0.05), respectively, whereas readily oxidizable organic C (ROC) was 50.47, 70, and 64.54 % higher (P \ 0.05). Microbial biomass (MBC) and water-soluble carbohydrate (WSCh) had no significant difference between rhizosphere and bulk soils in the 10-and 20-year stands, whereas a 9.88 % lower for MBC and a 36.47 % higher for WSCh in rhizosphere soil compared with bulk soil under 30-year stand were found (P \ 0.05). Rhizosphere soil respiration showed a significantly negative relationship with ROC (r = 0.51, P \ 0.05), WSCh (r = 0.60, P \ 0.01) and MBC (r = 0.68, P \ 0.01). The effect of the citrus rhizosphere on measured soil labile organic carbon fractions differed for each citrus stand age.

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Soil microbial properties under different grain-for-green patterns in depressions between karst hills

Cited by 2 publications

References 4 publications

Effect of Different Grain for Green Approaches on Soil Bacterial Community in a Karst Region

Effect of Different Grain for Green Approaches on Soil Bacterial Community in a Karst Region

Soil labile organic carbon fractions in rhizosphere soil in citrus plantations in the Three Gorges Reservoir Area

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