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Contribution of soil fauna to the degradation of recalcitrant components in Cinnamomum camphora foliar litter in different-sized gaps in Pinus massoniana plantations

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Journal of Forestry Research 2019年第3期30卷 931-941页

作者： Yan Zhang Danju Zhang Xun Li Jian Zhang Institute of Ecology and Forestry College of Forestry Chengdu 611130People’s Republic of China collaborative innovation center of ecological security in the upper reaches of yangtze river Chengdu 611130People’s Republic of China

Forest gaps are important in forest dynamics and management, but little is known about how soil fauna influence the degradation of recalcitrant litter components in different-sized forest gaps. This investigation uses litterbags with two different mesh sizes (0.04 and 3 mm) to control the meso- and microfauna entering the bags to quantify the contribution of soil fauna to the degradation of recalcitrant components (including condensed tannins, total phenol, lignin and cellulose) during litter decomposition. The experiment was conducted in seven different forest gap sizes in Pinus massoniana plantations over 1 year. One closed-canopy site (CC) and forest gap sizes of 100, 225, 400, 625, 900, 1225 and 1600 m^2 were created in a P. massoniana plantation in the Sichuan basin of China;the CC was treated as the control. Cinnamomum camphora foliage from local native trees was used in all forest gap experiments. We found the following:(1) Gap size had significant effects on the degradation rates (E) of condensed tannins and lignin and on the contributions of soil fauna;medium-sized gaps also presented high degradation rates. Soil fauna obviously contributed to the degradation of recalcitrant foliar litter components in medium-sized gaps.(2) The highest contribution to degradation (40.98%) was recorded for lignin, and the lowest contribution (0.29%) was recorded for condensed tannins. The results indicate that medium-sized gaps (900 m^2) were conducive to the degradation of recalcitrant litter components by soil fauna.

关键词： Cinnamomum camphora Foliar litter Gap size Pinus massoniana Recalcitrant litter components Soil fauna

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Characteristics of fungal community structure during the decomposition of mixed foliage litter from Pinus massoniana and broadleaved tree species in southwestern China

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Journal of Plant Ecology 2020年第5期13卷 574-588页

作者： Yan Zhang Xun Li Danju Zhang Yu Qin Yang Zhou Simeng Song Jian Zhang Key Laboratory of ecological Forestry Engineering Institute of Ecology&ForestrySichuan Agricultural University611130 ChengduChina collaborative innovation center of ecological security in the upper reaches of the yangtze river Sichuan Agricultural UniversityChengdu 611130China

Aims The conifer litter is fairly recalcitrant and nutrient poor,and broadleaved litter promotes coniferous litter decomposition by increasing degradable nutrients and promoting microbial *** Pinus massoniana litter and three broadleaved litters may increase the diversity and abundance of fungal decomposers compared with those in *** litter and vary depending on the number and proportion of broadleaved species *** We analysed the composition and diversity of fungal communities during mixed litter decomposition in southwestern China with 35 treatments(***,Toona sinensis,Cinnamomum camphora and Sassafras tzumu litter)using Illumina high-throughput *** Findings The mixed litters increased fungal diversity and richness compared with those in the single-species litter,except in the following treatments:*** litter accounting for 70%-80%in the ***+***,***+***+*** and ***+***+*** combinations,and ***+***+***+*** combination with small proportion of *** *** diversity and richness of the 7:1:2 combination of ***+***+*** were significantly higher than those in the other *** and Basidiomycota were the dominant phyla,and Aspergillus was the most abundant *** decomposition of litters from one needleleaf and one broadleaved species(6:4)and one needleleaf species and two broadleaved species(broadleaved litter accounting for 30%-40%)exhibited synergistic interactions throughout the decomposition process,and the relative abundance of fungi that decompose refractory substances *** ***+***+*** combination and a 30%-40%broadleaf litter proportion increased fungal diversity and accelerated the decomposition of recalcitrant coniferous ***,*** and *** are a potential candidate species for mixed planting with ***

关键词： fungal community mixed leaf litter non-additive effect Pinus massoniana high-throughput sequencing

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Impacts of soil fauna on nitrogen and phosphorus release during litter decomposition were differently controlled by plant species and ecosystem type

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Journal of Forestry Research 2019年第3期30卷 921-930页

作者： Yan Peng Wanqin Yang Kai Yue Bo Tan Fuzhong Wu Long-term Research Station of Alpine Forest Ecosystems Provincial Key Laboratory of Ecological Forestry EngineeringInstitute of Ecology and ForestrySichuan Agricultural UniversityChengdu 611130SichuanPeople’s Republic of China Department of Geosciences and Natural Resource Management University of CopenhagenRolighedsvej 231958 Frederiksberg CDenmark collaborative innovation center for ecological security in the upper reaches of the yangtze river Chengdu 611130 People’s Republic of China

The dynamics of litter nitrogen (N) and phosphorus (P) release could be affected by soil fauna and environmental conditions. The objective of the present study was to investigate the effects of soil fauna on the dynamics of N and P during foliar litter decomposition in three types of ecosystems (i.e., montane forest, ecotone, and dry valley) along an elevation gradient. A field experiment using litterbags with two different mesh sizes (0.04 and 3 mm) was conducted from November 2013 to October 2014. Nitrogen and P release rates in decomposing foliar litter from fir (Abies faxoniana) and birch (Betula albosinensis) in montane forest, oak (Quercus baronii) and cypress (Cupressus chengiana) in ecotone, and cypress and clovershrub (Campylotropis macrocarpa) in dry valley were investigated in the upper reaches of the yangtze river. Soil fauna strongly affected N and P release across different decomposition periods and ecosystem types. The average release rate of N mediated by soil fauna across the entire year was higher in the dry valley (15.6–37.3%) than in the montane forest (0.5–6.4%) and the ecotone (- 3.7–4.9%). The effects of soil fauna on P release rate were manifest in both the montane forest and the dry valley. Moreover, the impacts of soil fauna can vary substantially among different decomposition periods. Our results indicated that soil fauna can significantly affect N and P release during litter decomposition. The N release rate mediated by fauna was likely to be more sensitive to the effects of plant species (i.e., initial litter chemical traits), while the P release rate mediated by soil fauna might be subject to the effects of local-scale environmental factors (e.g., temperature) to a greater extent.

关键词： Dry valley Ecotone Environmental factors Litterbag Montane forest Release rate

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Screening and Identification of Waterlogging Tolerance in Brassica napus Germplasm Resources

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Agricultural Biotechnology 2019年第1期8卷 17-20页

作者： Yun LI Cunkou QI Sanxiong FU Feng CHEN Song CHEN Institute of Industrial Crops Jiangsu Academy of Agricultural Sciences Key Laboratory of Cotton and Rapeseed Ministry of Agriculture Jiangsu collaborative innovation center for Modern Crop Production

In order to evaluate,screen and identify waterlogging-tolerant Brassica napus resources and provide good germplasm materials for breeding of waterlogging-tolerant rape,608 B. napus germplasm materials from different sources were identified and screened for waterlogging-tolerant germplasms. The identification results showed that tested materials had dead seedling rates in the range of 0-100%,indicating that these rape germplasm materials varied extensively in waterlogging tolerance. Among the 608 materials,waterlogging-tolerant materials( grade I,relative dead seedling rate≤21%) accounted for 25. 49%; non-tolerant materials( grade Ⅳ + V,dead seedling rate≥61%) accounted for 29. 43%; and other materials had waterlogging tolerance between the two. The identification results of waterlogging tolerance in the 349 rape germplasm resource from the upper,middle and lower reaches of yangtze river and Huang-Huai Basin showed that materials from the lower yangtze river had the lowest average dead seedling rate of 38. 8%,which was remarkably lower than materials from other ecological regions,and waterlogging-tolerant materials among them accounted for 33. 6%,which was also remarkably higher than materials from other ecological regions. It could thus be seen that materials from the lower yangtze river have stronger waterlogging tolerance than those from other ecological regions overall. In this study,24 highly-tolerant B. napus germplasms( dead seedling rate < 1%) were selected from the 608 B. napus germplasm materials,which could be used for breeding of waterlogging-tolerant rape and related fundamental research.

关键词： Brassica napus Identification of waterlogging tolerance Germplasm screening

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Effects of litter quality and climate change along an elevational gradient on litter decomposition of subalpine forests, Eastern Tibetan Plateau, China

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Journal of Forestry Research 2016年第3期27卷 505-511页

作者： Zhenfeng Xu Jianxiao Zhu Fuzhong Wu Yang Liu Bo Tan Wanqin Yang Key Laboratory of ecological Forestry Engineering of Sichuan Province Institute of Ecology & Forest Sichuan Agricultural University Chengdu 611130 China Long-term Research Station of Alpine Forest Ecosystems and Monitoring Station for Eco-environments in the Rainy Zone of SW China Chengdu China Department of Ecology College of Environmental SciencesKey Laboratory for Earth Surface of Ministry of EducationPeking University Beijing 10087 China

Temperature and freeze-thaw events are two key factors controlling litter decomposition in cold *** global warming and changes in freeze-thaw cycles therefore may directly or indirectly impact litter decomposition in those ecosystems. Here, we conducted a2-year-long litter decomposition experiment along an elevational gradient from 3000 to 3600 m to determine the potential effects of litter quality, climate warming and freeze-thaw on the mass losses of three litter types [dragon spruce（Picea asperata Mast.）, red birch（Betula albosinensis Burk.）, and minjiang fir（Abies faxoniana Rehd. et Wild）]. Marked differences in mass loss were observed among the litter types and sampling dates. Decay constant（k） values of red birch were significantly higher than those of the needle litters. However, mass losses between elevations did not differ significantly for any litter *** the winter, lost mass contributed 18.3-28.8 % of the net loss rates of the first year. Statistical analysis showed that the relationships between mass loss and litter chemistry or their ratios varied with decomposition periods. Our results indicated that short-term field incubations could overestimate the k value of litter *** mass was lost from subalpine forest litters during the wintertime. Potential future warming may not affect the litter decomposition in the subalpine forest ecosystems of eastern Tibetan Plateau.

关键词： Alpine forest Elevational gradient Freeze-thaw Global warming Mass losses

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