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Soil Ecology Group passed the 4-yr academic evaluation

2016年6月20日 评论已被关闭

On 13th June, Soil Ecology Group (SEG) passed the 4-yr academic evaluation.

After Professor Yang leading SEG in 2012, SEG  faced the first academic evaluation. On 13th June, Professor Yang given academic commitee a presentation to introduce achivement, weakness and future plan of SEG. During these 4 years, SEG continually focus on soil diversity, and its relationship to nutrient cycling, trophic cascade effect, interaction betwen plant and soil organism, and conservation. Finally, published 19 paper with first and (or) corresponding author including Functional Ecology, Global Change Biology, Soil Biology & Biochemistry, Plant and Soil. And also other 12 papers cooperated with other research groups. In future, SEG will plan to extend research to Southeast Asia and do more contribution to soil diversity research in tropical Asia. As commitee criticised, we should also think about to continually focus deep on specific important scientific questions.

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Hongyan Hu and Zhipeng Li passed their graduation thesis defense

2016年6月20日 评论已被关闭

On the 1th June,  two master students in soil ecology group, Hongyan Hu and Zhipeng Li passed their graduation thesis defense.

Insect herbivory is important process in ecological system. It’s not only affect plant growing and community composition, but also affect ecosystem productivity and nutrient cycling within ecosystems. As forest fragmentation is intensifying, the effect of fragmentation on ecological system process is becoming a hot issue of ecological research in recent years. In order to understand how forest fragmentation effect on insect herbivory, Hongyan Hu surveyed insect herbivory of dominant tree species in four rain forest fragments and eleven evergreen broad-leaved forest fragments and continuous forest in Nabanhe National Reserve of Xishuangbanna. Her results showed that forest fragmentation could cause mean herbivory frequency of dominant species decreased significantly, but had no significant effect on mean herbivory of them. Forest type and season could influence insect herbivory of dominant species in forest fragments significantly, but fragment area, tree diversity and leaf characteristics were not correlated with insect herbivory of dominant species.

DSC_0888Photo of Hongyan Hu(胡鸿雁) with her supervisor Zheng Zheng(郑征)

Soil nematodes play a key role in many important ecological processes such as nutrients cycling and vegetation succession. However, it needs still further studies to explore the relative importance and characteristic scale of niche processes and neutral processes on soil nematodes community assemblage, especially for tropical seasonal rainforests. Through high intensively collecting spatial information about topography, soil properties, litter fall, vegetation and nematodes community structure, Zhipeng Li found that biotic and abiotic environmental heterogeneities are important for nematodes community assemblage in tropical seasonal rainforests. It might have important influence on ecosystem function and maintenance of aboveground biodiversity.

DSC_0882Photo of Zhipeng Li(李志鹏) with his supervisor Xiaodong Yang(杨效东)

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Professors Zhihong Xu and Chris Johnson visited Soil Ecology Group

2016年6月5日 评论已被关闭

Invited by Professor Yang (PI), Professors Zhihong Xu and Chris Johnson visited Soil Ecology Group (SEG) On 26th-29th May, 2016. Professor Zhihong Xu is the director of Environmental future research center in Griffith University, Australia, and chief editor of Journal of Soils and Sediments. Chris E. Johnson is the professor in Syracuse University, USA, and editor of Journal of Soils and Sediments.

On 27th May, in the International Academic Hall, Professor Zhihong Xu give us a presentation with title of Tipping points of non-linear tree growth responses to climate change in different forest ecosystems from subtropical to boreal regions.  Chris E. Johnson give us a presentation with title of Soil Carbon stocks in a temporate hardwood forest: Climate changes effects and recover from chronic acidification.

On 28th May, Professor Zhihong Xu and Chris Johnson visitied the 20 ha. forest dynamic plot in bubeng.

Professor Zhihong Xu and Chris Johnson are very interesting in the ecological process of nutrients cycling in tropical rainforest and discussed with SEG for the potential possibility for cooperation in future.

2 in XTBG

1 in field

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Attending International Workshop on Agricultural Resources and Environment (2016)

2016年5月26日 评论已被关闭

During 21-24 May, 2016, Professor Xiao-dong Yang, and colleagues Hai-feng Xiao and Shang-wen Xia attended the International Workshop on Agricultural Resources and Environment (2016) Soil-Plant Interactions and Soil Microbial Ecology undertake by Nanjing Agricultural University.  More than 100 scientists and students attended the conference. Xiao-dong Yang given a presentation with title of “Link biodiversity to reconstruct Environmental Friendly Rubber Plantation”, Hai-feng Xiao given a presentation with title of “Genomics reveal distribuional patterns of soil nematode in relation to environmental viriables in tropical and subtropical forests”.

After the meeting, we visited Professors Man-qiang Liu, and Hui-xin Li, et al in soil ecology lab in College of Resource and Environment Science and have friendly academic communications. Xiao-dong Yang given a presentation with title of “Climate and soil fauna differently modulate the effects of litter quality on decomposition along elevation gradient in subtropical evergreen broad-leaved forests”. Shang-wen Xia given a presentation with title of “Effect of biotic and abiotic factors on scale-dependent variability of soil nutrients”.

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合影

Group photos with part of collegue and students in soil ecology lab in College of Resource and Environment Science and visiting scholars including Bryan Sydney Griffiths and Michael Bonkowski

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Visiting Yuanjiang Dry-hot Valley Ecological Station

2016年4月27日 评论已被关闭

During 18-19 April 2016, Prefossro Xiao-Dong Yang, staff Jian-Ming Gan and Shang-Wen Xia visited Yuanjiang Dry-hot Valley Ecological Station.

With guide of station-officer Shu-Bing Zhang, we visited the dynamic monitor plot. We are very impressed by special savanna climate and plant adaption traits here, and discussed with station-officers for the potential for conduct soil ecology experiment here.

元江站

元江站2

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Attending workshop of Key Laboratory of Tropical Forest Ecology, XTBG

2016年4月8日 评论已被关闭

During 2-5th April, 2016, three colleagues of Soil Ecology Group, Xiaodong Yang, Zheng Zheng, and Shangwen Xia, attended the workshop hosted by Key Laboratory of Tropical Forest Ecology, XTBG  in Ailao Moutain. About 40 colleagues and students in XTBG attended the workshop and contributed about 40 ideas for how to analysis the long term dataset accumulated by three ecological stations. After grouping and panel discussion, about 15 proposals were selected for conference presentation and obtained dataset supporting from ecological stations.

Soil Ecology Group contributed two proposals, including litterfall decomposition dynamic and mechnism, and Mechanism and dynamic of emergence of dominant nitrogen-fixing plant groups during secondary succession.

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Visiting Thailand

2016年1月14日 评论已被关闭

During 13-21th December, 2015, Dr. Haifeng Xiao and Shangwen Xia had visited CTFS plots in Thailand. They did field trip in 2 permanent forest dynamics plot which from north to south and visited Faculty of Forestry, Kasetsart University (FFKU). At FFKU, they discussed potential cooperation with Professor Sarayudh Bunyavejchewin for developing soil ecology work in 20ha plots in Thailand, and made working plan for future.

trang_plot

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Visiting Donghua University of Taiwan

2016年1月14日 评论已被关闭

Prof. Yang xiaodong attended “The 9th workshop on forest dynamics across the Tawan Straits” at Donghua University of Taiwan on 21-23th of November in 2016. In the meeting, he did a presentation with title: “Soil fauna diversity and distribution in the tropical and subtropical forests – a case study of 20ha CTFS plot in Yunnan province, SW China”.

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International Symposium on Forest Soils Linking Soil Processes to Forest Productivity and Water Protection under Global Change

2016年1月3日 评论已被关闭

Prof. Yang xiaodong and Douglas Schaefer attended the “International Symposium on Forest Soils Linking Soil Processes to Forest Productivity and Water Protection under Global Change” at Fuzhou, on 24-26th of October in 2015. Prof Yang did a presentation with title: “Climate and soil fauna differently modulate the effects of litter quality on decomposition along elevation gradient in subtropical evergreen broad-leaved forests”, and Prof. Douglas Schaefer did a presentation with title: “Potential effects of tree mortality and climate on forest dead-wood resources”.

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Invasive plants modify soil microbial community and that benefited plant growth

2015年9月1日 评论已被关闭

Successful invasion by exotic plant species can modify the abundance and composition of soil microbial communities. Eupatorium adenophora and Chromolaena odorata are exotics and have become highly invasive plants in China. Several studies have investigated mechanisms of their successful invasions including phenotypic plasticity, genetic differentiation, and allelopathy, but little is known about effects on soil microorganisms.

Dr. XIAO Haifeng of Soil Ecology Group in Xishuangbanna Tropical Botanical Garden (XTBG) and his colleagues used two invasive (E. adenophora and C. odorata) and two native plant species (Eupatorium japonicum and Eupatorium heterophyllum) to compare the soil feedback (to plant growth) before and after microbial-community exposure to sterilization of the soil and to plant-root exudates. They found that soil sterilization significantly increased biomass of native Eupatorium japonicum and Eupatorium heterophyllum but did not affect these two invasive species’ biomass. After root exudates from these plants had acted on the soil microbial community for 10 months, soil sterilization significantly decreased the growth of E. adenophora and C. odorata but still significantly increased the biomass of two native species. Denaturing gradient gel electrophoresis revealed that these four plant species modified fungal rather than bacterial communities. Subsequent sequencing results indicated that C. odorata soils had more dominant arbuscular mycorrhiza fungal (AMF) species compared with other plant species. These results strongly suggest that invasive E. adenophora and C. odorata produced plant-soil benefit themselves, which may be among the belowground mechanisms contributing to their success as invasive species.

The study entitled “Soil fungi rather than bacteria were modified by invasive plants, and that benefited invasive plant growth” has been published online in Plant and Soil.

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