Changes in soil microbial community composition and organic carbon fractions in an integrated rice–crayfish farming system in subtropical China

Si, Guohan; Peng, Chenglin; Yuan, Jiafu; Xu, Xiangyu; Zhao, S. J.; Xu, Dawei; Wu, Jinshui

doi:10.1038/s41598-017-02984-7

Cited by 85 publications

(50 citation statements)

References 66 publications

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“…The sum of (a), (b), (c), and (d) represented total bacteria PLFA. The PLFAs of 16:1ω5c, 16:1ω7c, 18:1ω7c and 18:1ω9c were chosen to identify aerobic bacteria; and a15:0, i15:0, i16:0, a17:0, i17:0, 16:1 2OH, 10Me16:0, 10Me17:0 and 10Me18:0 to identify anaerobic bacteria [52][53][54]. The ratio of total fungal to total bacterial PLFAs (F/B) and gram-positive to gram-negative bacteria (G+/G-) were then calculated.…”

Section: Analysis Of Microbial Biomass and Structurementioning

confidence: 99%

Soil Microbial Community Structure and Physicochemical Properties in Amomum tsaoko-based Agroforestry Systems in the Gaoligong Mountains, Southwest China

Liu

Cai

et al. 2019

Sustainability

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Amomum tsaoko is cultivated in forests of tropical and subtropical regions of China, and the planting area is expanding gradually. However, little attention has been paid to the impact of A. tsaoko cultivation on the soil characteristics of the regions. We analyzed the effects of the A. tsaoko-forest agroforestry system (AFs) on the composition of soil microbial communities with increasing stand ages. We also compared the soil physicochemical properties, microbial biomass, and phospholipid fatty acid (PLFA) composition between native forest (NF) and AFs. The results showed that the level of total carbon, nitrogen, and organic matter dramatically dropped in AFs with increasing stand ages. pH affected other soil properties and showed close correlation to total carbon (P = 0.0057), total nitrogen (P = 0.0146), organic matter (P = 0.0075), hydrolyzable nitrogen (P = 0.0085), available phosphorus (P < 0.0001), and available potassium (P = 0.0031). PLFAs of bacteria (F = 4.650, P = 0.037), gram-positive bacteria (F = 6.640, P = 0.015), anaerobe (F = 5.672, P = 0.022), and total PLFA (F = 4.349, P = 0.043) were significantly affected by different treatments, with the greatest value for NF treatment, and least value for AF5. However, the microbial biomass declined during the initial 5 years of cultivation, but it reached the previous level after more than 10 years of cultivation. Our research suggests that AFs is a profitable land-use practice in the Gaoligong Mountains and that AFs showed a recovering trend of the soil nutrient condition with increasing stand ages. However, the severe loss of nitrogen in the soil of AFs requires additional nitrogen during cultivation to restore it to pre-cultivation levels.

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Section: Analysis Of Microbial Biomass and Structurementioning

confidence: 99%

Soil Microbial Community Structure and Physicochemical Properties in Amomum tsaoko-based Agroforestry Systems in the Gaoligong Mountains, Southwest China

Liu

Cai

et al. 2019

Sustainability

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“…The fatty acids of 16:1ω7c and 18:1ω7c were used to represent aerobic bacteria, and 17:0cy and 19:0cy were used to represent anaerobic bacteria [28]. The PLFAs 18:2ω6,9c and 18:1ω9c were chosen to represent fungi, and 10Me 16:0, 10Me 17:0 and 10Me 18:0 to identify actinomycetes [26,29,30]. The ratio of fungal PLFAs to bacterial PLFAs was used to calculate the F/B ratio [29].…”

Section: Soil Microbial Biomassmentioning

confidence: 99%

Analysis of Soil Degradation Causes in Phyllostachys edulis Forests with Different Mulching Years

Zhao

Wang

et al. 2018

Forests

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Moso bamboo (Phyllostachys edulis (Carrière) J.Houz.) is famous for its fast growth and biomass accumulation, as well as high annual output for timber and bamboo shoots. Organic mulches are widely used to improve shoots' production in moso bamboo forests. However, continuous mulching management may cause bamboo forest degradation and affect sustainable development. The objective of this study was to identify the degradation mechanism and to provide a theoretical basis for recovery. A complete randomized block design with four treatments was conducted, including mulching for one year (M1), two years (M2), three years (M3) and no-mulching management (NM). Soil nutrient contents, enzyme activities and microbial biomass were determined. With the increase of mulching years, the soil pH value gradually reduced, causing soil acidification, but the content of soil organic matter was inclined to ascend. Soil total nitrogen (TN), total phosphorus (TP) and total potassium (TK) contents showed an increasing trend, and they were significantly higher in mulching stands than those in NM (p < 0.05). Contents of soil available nutrients (AN, AP and AK) increased, then decreased with the increase of mulching years and peaked in M1. With the increase of mulching years, the soil stoichiometry ratio (C/N, C/P and N/P) gradually increased. Soil invertase, urease and acid phosphatase activities presented a single-peak curve and reached the maximum within one year after mulching. Total microbial biomass and that of individual groups changed greatly after mulching. Soil microbial biomass increased first and then decreased, and it was the largest in M1. The fungi:bacteria ratio decreased in the first year and then began to rise, while the aerobic:anaerobic ratio showed the opposite trend. According to the overall results, M3 leads to soil acidification, imbalance of the nutrients' proportion, abnormal enzyme activity and change of soil microbial flora, and rotated mulching management (mulching one year and then recuperating one year) should be recommended in practice.

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“…Ample evidence has accumulated in recent years that the quantity and quality of soil organic matter can significantly affect the composition of soil microbial community [28][29][30] , which is often represented by the phenomenon that soils with high organic matter content tend to have higher microbial community diversity 31,32 . In our study, both the Chao 1 index and the Shannon index in the M treatment were lower than that in the NM treatment Paired T-test DF = 2, t = 0.27 p = 0.8140 DF = 2, t = −2.08 p = 0.1732 DF = 2, t = −8.12 p = 0.0148 DF = 2, t = −2.77 p = 0.1096 DF = 2, t = −3.32 p = 0.0800 DF = 2, t = 0.65 p = 0.5799 DF = 2, t = 0.80 p = 0.5083 DF = 2, t = −1.73 p = 0.2254 DF = 2, t = −1.30 p = 0.3227 www.nature.com/scientificreports www.nature.com/scientificreports/ ( Fig.…”

Section: Discussionmentioning

confidence: 99%

Effects of applying ramie fiber nonwoven films on root-zone soil nutrient and bacterial community of rice seedlings for mechanical transplanting

Zhou

Chen

et al. 2020

Sci Rep

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Raising rice seedlings in flat trays has become the main method for mechanized transplanting of rice in China. However, seedling blocks raised by this method were easily cracked in practice, and this problem can be solved by padding a thin ramie fiber nonwoven film on the bottom surface of seedling tray. This study was conducted to determine the effects of this film on root-zone environment of rice seedlings. The results showed that on the 10 th day after sowing, the soil inorganic nitrogen, especially nitrate nitrogen, content in the root-zone of the film treatment were considerably higher than in the no-film treatment, in contrast, the soil organic matter content was lower in the film treatment, and by the 20 th day, the gap between treatments was enlarged. After applying the film, the Chao 1 index and Shannon index values for the soil bacterial community diversity decreased, and the rice seedlings were shorter, had higher root/shoot ratios, lower nitrate contents, and higher soluble sugar contents. We conclude that application of the ramie fiber nonwoven film resulted in substantial changes in the soil nutrient and bacterial community in root-zone in a short time, which significantly impacted the growth and development of rice seedlings.Rice is a major staple food for about 50% of the world's population 1 . Rice fields account for more than 12% of global cropland area 2 . China is one of the major rice-producing countries in the world with a rice cultivation area of about 30 million hectares, accounting for approximately 18.6% of the world's rice field area 3 . With an increasingly scarce rural labor force, raising rice seedlings in flat trays followed by mechanical transplantation has become a prevalent cultivation method to replace hand transplanting in Chinese rice production 4 . However, this method has a serious defect in practice, as the root system of the seedlings was often not sufficiently intertwined by the optimum transplanting date (20-25 days after sowing). Insufficient rooting in the seedling block means the rice seedling blocks easily crack (Fig. 1c), so the efficiency of mechanical transplanting was seriously decreased 5 .In recent years, An innovative ramie fiber nonwoven film (Fig. 1a) was developed to solve this problem 6 . This film was made of waste fiber from the ramie spinning industry and modified starch, and was constructed using a dry-laid, nonwoven process. Unlike the traditional agricultural nonwoven films that are usually used as mulching materials to cover soil, this film was used to pad the bottom surface of a seedling tray, and was covered by soil (Fig. 1b). The film was quite thin (only about 0.15-0.25 mm); however, previous research 7,8 showed that the efficiency of machine transplanting was significantly improved by using this film, as it promoted the growth of rice seedling roots and helped to form a strong, not easily broken seedling block (Fig. 1d). Moreover, it can significantly improve rice seedling quality, speed up the emergence of new tillers after transplanting, and ...

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Changes in soil microbial community composition and organic carbon fractions in an integrated rice–crayfish farming system in subtropical China

Cited by 85 publications

References 66 publications

Soil Microbial Community Structure and Physicochemical Properties in Amomum tsaoko-based Agroforestry Systems in the Gaoligong Mountains, Southwest China

Soil Microbial Community Structure and Physicochemical Properties in Amomum tsaoko-based Agroforestry Systems in the Gaoligong Mountains, Southwest China

Analysis of Soil Degradation Causes in Phyllostachys edulis Forests with Different Mulching Years

Effects of applying ramie fiber nonwoven films on root-zone soil nutrient and bacterial community of rice seedlings for mechanical transplanting

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