scholarly journals Dynamics of Soil Nematode Communities Revealed Significant Variation in Greenhouse with Different Continuous Cropping Years

2019 ◽  
Author(s):  
Xueliang Tian ◽  
Xiaoman Zhao ◽  
Zhenchuan Mao ◽  
Bingyan Xie
Keyword(s):  
Relative Abundance ◽  
Significant Variation ◽  
Growing Season ◽  
Continuous Cropping ◽  
Soil Nematode ◽  
Root Knot Nematode ◽  
Dominant Group ◽  
Nematode Communities ◽  
Soil Nematode Community ◽  
Soil Nematode Communities

AbstractContinuous cropping usually resulted in a series of soil problems, especially root knot nematode disaster in greenhouse because of imbalance in soil nematode community. However, the dynamic change in soil nematode community in greenhouse with various continuous cropping years during plant growing season is unclear. Here, soil nematode communities in greenhouse after 2 and 10 years of continuous cropping were comparatively analyzed using 18S rDNA high-throughput sequencing to reveal the changing processes in soil nematode communities. Compared to the 2-year greenhouse, soil in the 10-year greenhouse showed soil acidification, nutrients accumulation, salinization. In term of α-diversity, Bacterial-feeding nematodes (BF) were dominant in the 2-year greenhouse over the whole growing season, but plant-parasitic nematodes (PP) became the dominant group in the 10-year greenhouse in the late growing season.Meloidogynegradually became the dominant group (Relative abundance 70.9%) in the 10-year greenhouse, whileRhabditidae(Relative abundance from 99.8% to 26.8%) was the predominant members in the 2-year greenhouse. For β-diversity, hierarchical clustering analysis, unWeighted UniFrac principal component analysis (PCA) and principal co-ordinates analysis (PCoA) all revealed that soil nematode communities in the two types of greenhouses exhibited significant differences. Redundancy analysis (RDA) showed that soil nematode communities in the 10-year greenhouse were related to high soil organic material, total nitrogen, electrical conductivity and disease index of root knot nematode. Fisher’ exact test and Pearson correlation coefficients revealed thatMeloidogynecaused main differences in soil nematode communities between the two types of greenhouses. Meanwhile, population dynamics ofMeloidogynewere divided into dormant phase, low-level increasing phase and exponential phase during the whole season. In total, the significant variation led different dynamics of soil nematode communities in the 2-year and 10-year greenhouse.

scholarly journals Seasonal Stabilities of Soil Nematode Communities and Their Relationships with Environmental Factors in Different Temperate Forest Types on the Chinese Loess Plateau

Forests ◽  
2021 ◽  
Vol 12 (2) ◽  
pp. 246
Author(s):  
Na Huo ◽  
Shiwei Zhao ◽  
Jinghua Huang ◽  
Dezhou Geng ◽  
Nan Wang ◽  
...  
Keyword(s):  
Food Web ◽  
Loess Plateau ◽  
Soil Nematode ◽  
Soil Food Web ◽  
Food Web Structure ◽  
Nematode Communities ◽  
Web Structure ◽  
Soil Nematode Community ◽  
Nematode Abundance ◽  
Soil Nematode Communities

The bottom-up effects of vegetation have been documented to be strong drivers of the soil food web structure and functioning in temperate forests. However, how the forest type affects the stability of the soil food web is not well known. In the Ziwuling forest region of the Loess Plateau, we selected three typical forests, Pinus tabuliformis Carrière (PT), Betula platyphylla Sukaczev (BP), and Quercus liaotungensis Koidz. (QL), to investigate the soil nematode community characteristics in the dry (April) and rainy (August) season, and analyzed their relationships with the soil properties. The results showed that the characteristics of the soil nematode communities and their seasonal variations differed markedly among the forest types. Compared to P. tabuliformis (PT), the B. platyphylla (BP) and Q. liaotungensis (QL) forests had higher plant diversity and more easily decomposed litters, which were more effective for improving the soil resource availability, thus, leading to more beneficial effects on the soil nematode community. In both the dry and rainy season, the soil nematode abundance was the highest in the BP forest. The Shannon–Wiener diversity index (H’), Pielou’s evenness index (J’), and nematode channel ratio index (NCR) were higher, while the Simpson dominance index (λ) and plant parasite index (PPI) were lower, in the BP and QL forests compared with in the PT forest. From the dry to rainy season, the total nematode abundance and the abundance of fungivores, bacterivores, and omnivore-predators, significantly increased in the QL and PT forests, and the values of the Wasilewska index (WI), maturity index (MI), H’, J’, λ, and NCR showed the most significant seasonal variability in the PT forest, which were mainly driven by changes in the soil labile C and N and the moisture content between the two seasons. Generally, the seasonal stability of the soil nematode communities was the highest in the BP forest and the poorest in the PT forest, probably due to variations in the plant diversity. Our results suggest the importance of tree species and diversity as bottom-up regulating factors of the soil food web structure, function, and seasonal stability, which has important implications for sustainable forest management in the Loess Plateau and other temperate regions.

Soil nematode assemblages in an acid soil as affected by lime application

Nematology ◽  
2015 ◽  
Vol 17 (2) ◽  
pp. 179-191 ◽  
Author(s):  
Jie Zhao ◽  
Cancan Zhao ◽  
Songze Wan ◽  
Xiaoli Wang ◽  
Lixia Zhou ◽  
...  
Keyword(s):  
Acid Soil ◽  
Trophic Group ◽  
Nematode Community ◽  
Soil Nematode ◽  
Nematode Communities ◽  
Soil Nematode Community ◽  
Lime Application ◽  
Statistical Approaches ◽  
Over Time ◽  
Soil Nematode Communities

Liming can affect soil biota through alterations in soil pH and soil structure. Many earlier studies monitored the responses of soil nematode communities to lime application but they did not come to a consensus and did not use indices of soil nematode community and multivariate statistical approaches developed over the past two decades. The present research explored the short-term effects of lime application on soil nematode communities in an acrisol in three Eucalyptus plantations in southern China. Nematodes were sampled from control and lime-treated plots at three periods from October 2011 to February 2012 at 0-10 cm and 10-20 cm soil depths. Repeated measures ANOVA showed that lime application significantly reduced the abundance of herbivores at 10-20 cm depth during the study. Lime application tended to increase the bacterivore index at 0-10 cm depth over time. Principal response curves of soil nematode community structure, in terms of nematode trophic group composition, revealed that the differences between control and lime application treatments increased over time, primarily because of the decline of fungivores in plots treated with lime. The decline in fungivores resulted mainly from declines of Filenchus and Ditylenchus. The results suggest that the fungal-mediated decomposition channel in the soil food web was suppressed by lime application. Our study also demonstrated that the sensitivity of different nematode genera to lime application varied widely, even for genera within the same trophic group. In particular, the abundance of several bacterivorous genera (Prismatolaimus, Plectus, Wilsonema, Protorhabditis, Diploscapter and Heterocephalobus) gradually declined and that of Rhabditonema at 0-10 cm depth gradually increased following lime application during the study; two herbivorous genera, Trophotylenchulus and Helicotylenchus, had opposite responses to lime application at 0-10 cm depth. Integrating univariate statistical approaches with multivariate approaches facilitated the analysis of soil nematode responses to lime application.

Status of soil nematode communities during natural regeneration of a subtropical forest in southwestern China

Nematology ◽  
2015 ◽  
Vol 17 (1) ◽  
pp. 79-90 ◽  
Author(s):  
Yujuan Li ◽  
Guoping Yang ◽  
Deborah A. Neher ◽  
Cheng-Yuan Xu ◽  
Jihua Wu
Keyword(s):  
Relative Abundance ◽  
Secondary Forest ◽  
Diversity Index ◽  
Subtropical Forest ◽  
Forest Recovery ◽  
Southwestern China ◽  
Soil Nematode ◽  
Nematode Communities ◽  
Virgin Forest ◽  
Soil Nematode Communities

Forest recovery has been extensively evaluated using plant communities but fewer studies have been conducted on soil fauna. This study reports the status of soil nematode communities during natural re-establishment after deforestation in a subtropical forest in southwestern China. Soil nematode communities of two secondary succession stages, shrub-grassland and secondary forest, were compared with those of virgin forest. Shrub-grassland had higher herbivore relative abundance but lower fungivore and bacterivore relative abundance than forests. Between secondary and virgin forest, the latter had higher abundance of bacterivores. Shrub-grassland had lower nematode diversity, generic richness, maturity index and trophic diversity index than virgin forest, whereas there were no differences in these indices between secondary forest and virgin forest. The small differences in nematode community structures between secondary forest and virgin forest suggest that soil nematode communities recovered to a level close to that of the undisturbed forest after up to 50 years of natural succession.

Carbofuran effects in soil nematode communities: Using trait and taxonomic based approaches

2011 ◽  
Vol 74 (7) ◽  
pp. 2002-2012 ◽  
Author(s):  
Sónia Chelinho ◽  
Klaus Dieter Sautter ◽  
Anabela Cachada ◽  
Isabel Abrantes ◽  
George Brown ◽  
...  
Keyword(s):  
Soil Nematode ◽  
Nematode Communities ◽  
Soil Nematode Communities

scholarly journals Soil nematode communities associated with hazelnut orchards in Turkey

2014 ◽  
Vol 6 (8) ◽  
pp. 112-121 ◽  
Author(s):  
Akyazi Faruk ◽  
Yildiz Senol ◽  
Firat Felek Anil
Keyword(s):  
Soil Nematode ◽  
Nematode Communities ◽  
Soil Nematode Communities

scholarly journals Application of PCR-DGGE method for identification of nematode communities in pepper growing soil

2016 ◽  
Vol 7 (1) ◽  
pp. 9-14
Author(s):  
Duong Duc Hieu
Keyword(s):  
Maximum Likelihood ◽  
Community Sample ◽  
Nematode Species ◽  
Viet Nam ◽  
Soil Nematode ◽  
Nematode Communities ◽  
Maximum Likelihood Tree ◽  
Relationship Of ◽  
First Time ◽  
Soil Nematode Communities

Soil nematodes play an important role in indication for assessing soil environments and ecosystems. Previous studies of nematode community analyses based on molecular identification have shown to be useful for assessing soil environments. Here we applied PCR-DGGE method for molecular analysisoffive soil nematode communities (designed as S1 to S5) collected from four provinces in Southeastern Vietnam (Binh Duong, Ba Ria Vung Tau, Binh Phuoc and Dong Nai) based on SSU gene. By sequencing DNA bands derived from S5 community sample, our data show 15 species containing soil nematode, other nematode and non-nematode (fungi) species. Genus Meloidogyne was found as abundant one. The genetic relationship of soil nematode species in S5 community were determined by Maximum Likelihood tree re-construction based on SSU gene. This molecular approach is applied for the first time in Vietnam for identification of soil nematode communities. Tuyến trùng đất đóng vai trò chỉ thị quan trọng trong công tác đánh giá môi trường và hệ sinh thái đất. Các nghiên cứu trước đây đã cho thấy lợi ích của việc phân tích cộng đồng tuyến trùng đất bằng định danh sinh học phân tử đối với việc đánh giá môi trường đất. Ở đây, chúng tôi ứng dụng phương pháp PCR-DGGE dựa trên gene SSU để phân tích năm (ký hiệu từ S1 đến S5) cộng đồng tuyến trùng đất thuộc các vùng trồng chuyên canh cây hồ tiêu ở miền nam Việt Nam (Bình Dương, Bà Rịa Vũng Tàu, Bình Phước và Đồng Nai). Bằng cách giải trình tự các vạch của mẫu tuyến trùng S5, kết quả cho thấy cộng đồng tuyến trùng này có 15 loài gồm nhóm tuyến trùng đất, nhóm các loại tuyến trùng khác và nhóm không phải tuyến trùng (nấm) và trong đó Meloidogyne là giống ưu thế. Mối quan hệ di truyền của các các loài tuyến trùng đất thuộc cộng đồng S5 được xác định bằng việc thiết lập cây phát sinh loài Maximum Likelihood dựa trên gene SSU. Đây là nghiên cứu đầu tiên ở Việt Nam sử dụng kỹ thuật PCR-DGGE để phân tích các cộng đồng tuyến trùng đất trồng hồ tiêu.

scholarly journals Neotyphodium impacts on soil nematode communities: rhizosphere- and litter-mediated interactions

2007 ◽  
Vol 13 ◽  
pp. 107-110
Author(s):  
M. Omacini ◽  
E.J. Chaneton ◽  
C.M. Ghersa
Keyword(s):  
Plant Traits ◽  
Lolium Multiflorum ◽  
Fungal Endophytes ◽  
Patch Dynamics ◽  
Trophic Levels ◽  
Soil Nematode ◽  
Patch Occupancy ◽  
Nematode Communities ◽  
Endophyte Infection ◽  
Soil Nematode Communities

There is a growing recognition that endophyte effects on host plant traits may be propagated through food chains. We studied Neotyphodium occultans effects on soil nematode communities mediated by current and past patch occupancy by endophyteinfected Lolium multiflorum populations. A microcosm experiment was performed to evaluate whether abundance and diversity of nematodes at different trophic levels were affected by endophyte infection through rhizosphere-mediated or littermediated effects. We found that presence of endophyte-infected plants and their aerial litter both triggered a bottom-up trophic cascade enhancing the abundance of herbivorous and predaceous nematode taxa. Endophyte infection also increased overall nematode richness, mostly through changes induced at the highest trophic level in this soil food web. Our results suggest that fungal endophytes can modify the linkages between aboveand belowground community compartments, with potential consequences on plant patch dynamics. Keywords: soil food webs, Lolium multiflorum, Neotyphodium occultans, plant-soil feedback, after-life effects, indirect interactions, trophic cascades

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