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The changes in soil organic carbon stock and quality across a subalpine forest successional series

Forest Ecosystems 2024年第4期11卷 423-433页

作者： Fei Li Zhihui Wang Jianfeng Hou Xuqing Li Dan Wang wanqin yang Zhejiang Provincial Key Laboratory of Plant Evolutionary Ecology and Conservation School of Life SciencesTaizhou UniversityTaizhou 318000China Linhai Station of Zhejiang Provincial Forest Ecological Research Taizhou UniversityTaizhou 318000China Taizhou Key Laboratory of Mountain Ecological Restoration and Special Industry Cultivation Taizhou UniversityTaizhou 318000China Hawkesbury Institute for the Environment Western Sydney UniversityPenrithNew South WalesAustralia

Soil organic carbon(SOC)affects the function of terrestrial ecosystem and plays a vital role in global carbon ***,large uncertainty still existed regarding the changes in SOC stock and quality with forest ***,the stock and quality of SOC at 1-m soil profile were investigated across a subalpine forest series,including shrub,deciduous broad-leaved forest,broadleaf-conifer mixed forest,middle-age coniferous forest and mature coniferous forest,which located at southeast of Tibetan *** results showed that SOC stock ranged from 9.8 to29.9 kg·m^(-2),and exhibited a hump-shaped response pattern across the forest successional *** highest and lowest SOC stock was observed in the mixed forest and shrub forest,*** SOC stock had no significant relationships with soil temperature and litter stock,but was positively correlated with wood debris ***,the average percentages of polysaccharides,lignins,aromatics and aliphatics based on FTIR spectroscopy were 79.89%,0.94%,18.87%and 0.29%,***,the percentage of polysaccharides exhibited an increasing pattern across the forest successional series except for the sudden decreasing in the mixed forest,while the proportions of lignins,aromatics and aliphatics exhibited a decreasing pattern across the forest successional series except for the sudden increasing in the mixed ***,the humification indices(HIs)were highest in the mixed forest compared to the other four successional stages,which means that the SOC quality in mixed forest was worse than other successional *** addition,the SOC stock,recalcitrant fractions and HIs decreased with increasing soil depth,while the polysaccharides exhibited an increasing *** findings demonstrate that the mixed forest had higher SOC stock and worse SOC quality than other successional *** high proportion of SOC stock(66%at depth of 20-100 cm)and better SOC quality(lower HIs)indicate that deep s

关键词： Forest successional series Soil organic cubon stock Molecular composition Humification indices Soil organic carbon quality

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济阳坳陷深层地热资源研究进展与下步展望

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油气地质与采收率 2024年第4期31卷 196-206页

作者：杨永红杨万芹陈云华崔营滨中国石化胜利油田分公司勘探开发研究院山东东营257015

济阳坳陷地热资源分布范围广、资源潜力大,是胜利油区未来地热资源开发利用的重要方向。为科学、高效地开发利用济阳坳陷地热资源,系统梳理了关于济阳坳陷水热型和干热岩型地热资源的热储层、热盖层、热源等地热地质条件,分别计算了2类... 详细信息

济阳坳陷地热资源分布范围广、资源潜力大,是胜利油区未来地热资源开发利用的重要方向。为科学、高效地开发利用济阳坳陷地热资源,系统梳理了关于济阳坳陷水热型和干热岩型地热资源的热储层、热盖层、热源等地热地质条件,分别计算了2类地热资源的资源量,揭示其地热资源潜力。研究结果表明,济阳坳陷水热型地热资源主要赋存在馆陶组、东营组及下古生界等,其中馆陶组为水热型地热资源潜力最大的层系,分布广、资源量大,是下步重点勘探开发利用层系。济阳坳陷属于“冷壳热幔型”沉积盆地,具有较高的大地热流值,干热岩型地热资源热储层主要为太古宇的岩浆岩和变质岩,深部地幔热流是其主要热源,热储层分布面积大,温度均较高,其资源丰度为渤海湾盆地中最高。济阳坳陷地热资源丰富,为加快其开发利用步伐,建议水热型地热资源要加强地热资源与油气的关系及资源分区评价2项关键工作;干热岩型地热资源的勘探开发仍处于起步探索阶段,今后需要重点加强其热储层类型的选择与热源机制2个方面的研究。

关键词：地热资源干热岩热储层热源地温场济阳坳陷

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Loss of total phenols from leaf litter of two shrub species: dual responses to alpine forest gap disturbance during winter and the growing season

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Journal of Plant Ecology 2020年第3期13卷 369-377页

作者： Wei He wanqin yang School of Life Science Taizhou UniversityTaizhou 318000ZhejiangChina Long-term Research Station of Alpine Forest Ecosystem Institute of Ecology&ForestrySichuan Agricultural UniversityChengdu 611130SichuanChina College of Horticulture and Forestry Sciences/Hubei Engineering Technology Research Center for Forestry Information Huazhong Agricultural UniversityWuhan 430070HubeiChina

Aims Alpine forest gaps can control understory ecosystem processes by manipulating hydrothermal ***,we aimed to test the role of alpine forest gap disturbance on total phenol loss(TPL)from the decomposing litter of two typical shrub species(willow,Salix paraplesia Schneid.,and bamboo,Fargesia nitida(Mitford)Keng f.).Methods We conducted a field litterbag experiment within a representative fir(Abies faxoniana Rehd.)forest based on‘gap openness treatments’(plot positions in the gap included the gap center south,gap center north,canopy edge,expanded edge and closed canopy).The TPL rate and litter surface microbial abundance(fungi and bacteria)of the two shrub species were measured during the following periods over 2 years:snow formation(SF),snow cover(SC),snow melting(ST),the early growing season(EG)and the late growing season(LG).Important Findings At the end of the study,we found that snow cover depth,freeze–thaw cycle frequency and the fungal copies g−1 to bacterial copies g−1 ratio had significant effects on litter *** abundances of fungi and bacteria decreased from the gap center to the closed canopy during the SF,SC,ST and LG periods and showed the opposite trend during the EG *** rate of TPL among plot positions closely followed the same trend as microbial abundance during the first year of *** addition,both species had higher rates of TPL in the gap center than at other positions during the first winter,first year and entire 2-year *** findings suggest that alpine forest gap formation accelerates litter TPL,although litter TPL exhibits dual responses to gap disturbance during specific critical *** conclusion,reduced snow cover depth and duration during winter warming under projected climate change scenarios or as gaps vanish may slow litter TPL in alpine biomes.

关键词： alpine forest gap freeze–thaw cycle fungi to bacteria ratio snow cover depth total phenols

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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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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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Variations in root chemistry of three common forest species,southwestern China

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Journal of Forestry Research 2019年第3期30卷 827-834页

作者： Qun Liu wanqin yang Fuzhong Wu Bo Tan Li Zhang Zhenfeng Xu Long-term Research Station of Alpine Forest Ecosystems Institute of Forest and Ecology Sichuan Agricultural University

Root chemistry varies with tree species and root diameter but little information is available about Tibetan forest species. The root chemistry of three root diameter classes (fine: 0–2 mm, medium: 2–5 mm, coarse: 5–10 mm) of three subalpine species (Abies faxoniana Rehd. and Wild, Picea asperata Mast., and Betula albosinensis Burkill) were investigated. Carbon concentrations, and carbon/nitrogen and carbon/phosphorus ratios increased but nitrogen, phosphorus and nitrogen/phosphorus ratios decreased with increasing root diameter. The roots of the conifers had higher carbon levels, and higher carbon/nitrogen and carbon/phosphorus ratios than birch roots. The opposite was found with nitrogen and phosphorus levels and nitrogen/phosphorus ratios. Lignin concentrations decreased but cellulose concentrations increased with greater root diameters. The results indicate that diameter-associated variations in root chemistry may regulate their contribution to detrital pools which has important implications for below-ground carbon and nutrient cycles in these subalpine forests.

关键词： Root diameter Lignin Cellulose Stoichiometry Subalpine forest

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Cumulative cellulolytic enzyme activities and initial litter quality in prediction of cellulose degradation in an alpine meadow of the eastern Tibetan Plateau

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Journal of Plant Ecology 2020年第1期13卷 51-58页

作者： Yamei Chen yang Liu Jian Zhang wanqin yang Changchun Deng Runlian He Key Laboratory of Ecological Forestry Engineering Long-Term Research Station of Alpine Forest EcosystemsInstitute of Ecology&ForestrySichuan Agricultural University211 Huimin RoadWenjiang DistrictChengdu 611130China

Aims Plant litter decomposition is a key ecosystem process that determines carbon and nutrient cycling in terrestrial *** a main component of litter,cellulose is a vital energy source for the microbes associated with litter *** important role of cellulolytic enzymes in litter cellulose degradation is well understood,but seasonal patterns of cellulose degradation and whether cumulative enzyme activities and litter quality forecast cellulose degradation in an alpine meadow remain elusive,which limits our understanding of cellulose degradation in herbaceous plant *** A two-year field litterbag experiment involving three dominant species(Ajuga ovalifolia,Festuca wallichanica,and Pedicularis roylei)was conducted in an alpine meadow of the eastern Tibetan Plateau to explore the seasonal patterns of cellulose degradation and how cumulative cellulolytic enzyme activities and initial litter quality impact cellulose *** findings Our study demonstrates that cellulose degraded rapidly and exceeded 50%during the first year,which mainly occurred in the first growing season(31.9%–43.3%).At two years of decomposition,cellulose degradation was driven by cumulative endoglucanase(R^(2)=0.70),cumulative cellobiohydrolase(R^(2)=0.59)and cumulative 1,4-β-glucosidase(R^(2)=0.57).In addition,the concentrations of cellulose,dissolved organic carbon,total phenol,lignin and lignin/N accounted for 52%–78%of the variation in cellulose degradation during the two years of *** best model for predicting cellulose degradation was the initial cellulose concentration(R^(2)=0.78).The enzymatic efficiencies and the allocation of cellulolytic enzyme activities were different among *** cellulolytic enzyme efficiencies were higher in the litter of *** with relatively lower *** the complete cellulose degradation of the leaf litter,*** and *** required 4-fold and 6.7-fold more endoglucanase activ

关键词： cumulative cellulolytic enzyme cellulose degradation enzyme efficiency initial litter quality

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Nitrous oxide emissions from three temperate forest types in the Qinling Mountains,China

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Journal of Forestry Research 2019年第4期30卷 1417-1427页

作者： Wei Xue Changhui Peng Huai Chen Hui Wang Qiuan Zhu Yanzheng yang Junjun Zhang wanqin yang Institute of Ecology and Forestry Sichuan Agricultural UniversityChengdu 611130People's Republic of China Laboratory for Ecological Forecasting and Global Change College of ForestryNorthwest A&F UniversityYangling 712100People's Republic of China Department of Biology Sciences Institute of Environment SciencesUniversity of Quebec at MontrealCase Postale 888&Succursale Centre-VilleMontreal H3C 3P&Canada Chengdu Institute of Biology Chinese Academy of SciencesChengdu 610041People's Republic of China

To understand soil N2O fluxes from temperate forests in a climate-sensitive transitional zone,N2O emissions from three temperate forest types(Pinus tabulaeformis,PTT;Pinus armandii,PAT;and Quercus aliena ***,QAT)were monitored using the static closed-chamber method from June 2013 to May 2015 in the Huoditang Forest region of the Qinling Mountains,*** results showed that these three forest types acted as N2O sources,releasing a mean combined level of 1.35±0.56 kg N2O ha^-1 a^-1,ranging from0.98±0.37 kg N2O ha^-1 a^-1 in PAT to 1.67±0.41 kg N2O ha^-1 a^-1 in QAT.N2O emission fluctuated seasonally,with highest levels during the summer for all three forest types.N2O flux had a significantly positive correlation with soil temperature at a depth of 5 cm or in the water-filled pore space,where the correlation was stronger for temperature than for the water-filled pore space.N2O flux was positively correlated with available soil nitrogen in QAT and *** results indicate that N2O flux is mainly controlled by soil temperature in the temperate forest in the Qinling Mountains.

关键词： Forest types Greenhouse gases N2O fluxes Qinling Mountains Soil temperature

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Soil C, N and P stocks and stoichiometry under different vegetation on the surface of the Leshan Giant Buddha

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Soil Ecology Letters 2022年第1期4卷 57-68页

作者： Fujia Wu wanqin yang Bo Sun Tianyu yang Xuli Chen Zhenfeng Xu Huixing Song College of Landscape Architecture Sichuan Agricultural UniversityChengdu 611130China College of Life Science Taizhou UniversityTaizhou 318000China Northwest Research Institute Co. Ltdof China Railway Engineering CorporationLanzhou 730000China Grottoes Research Center Management Committee of Leshan Grand Buddha Scenic SpotLeshan 614003China Provincial Key Laboratory of Ecological Forestry Engineering Institute of Ecology and ForestrySichuan Agricultural UniversityChengdu 611130China

The accumulation of soil organic matter and nutrients is an important pathway in effectivelyunderstanding the mechanisms of plant settlement and rock weathering, while the characteristics ofsoil organic carbon (C), nitrogen (N) and phosphorus (P) under different vegetation remain *** this study, the stocks and stoichiometry of soil organic C, N and P were determined in differentpositions and types of vegetation on the surface of the Leshan Giant Buddha. We found that the totalstocks of soil organic C, N and P were 1689.77, 134.6 and 29.48 kg, respectively, for the *** stocks of soil organic C, N and P under vascular plants were higher than those under othervegetation, with highest values observed under herb. Higher stocks per unit area (m2) of soil organicC, N and P were found on the left and right arms, shoulders, and two platforms. These results providea full primary picture in understanding soil organic C, N and P accumulation and distribution on thesurface of the Buddha, which could supply the fundamental data on weathering management of theBuddha and other similar open-air stone carvings.

关键词： Rock weathering Soil organic matter Plant settlement Open-air stone carving

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Forecast of Exploration Potential and Reserves Growth in Jiyang Depression

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China Oil & Gas 2010年第4期17卷 24-28页

作者： yang wanqin Geological Scientific Research Institute SINOPEC Shengli Oilfield Co.Ltd.

Jiyang Depression,located in northern Shandong Province,is part of the Bohai Bay Basin of Sino-Korean platform,with the exploration acreage being 35,696 square *** consists of Dongying,Zhanhua,Chezhen,and Huimin sags and the beach area,73 oil and gas fields have been discovered *** drilling the first commercial oil flow in Hua-8 well in 1961,exploration in Jiyang Depression has been carried out for 49 years *** the end of 2008,3D seismic exploration had been carried out in 50.4% of the Depression,there were 0.22 exploratory well and and 0.07 wildcat per square kilometer separately.

关键词：济阳坳陷勘探潜力储量增长预测三维地震勘探渤海湾盆地中朝地台天然气田

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