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Plant above-ground biomass and litter quality drive soil microbial metabolic limitations during vegetation restoration of subtropical forests

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Soil Ecology Letters 2023年第2期5卷 103-115页

作者： Shuo Zhang Ying-Ping Wang Xi Fang Jinlei Chen Nannan Cao Pingping Xu Mengxiao Yu Xin Xiong Xiangping Tan Qi Deng Junhua Yan Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems South China Botanical GardenChinese Academy of SciencesGuangzhou 510650China University of Chinese Academy of Sciences Beijing 100049China CSIRO Oceans and Atmosphere PMB 1AspendaleVictoria 3195Australia Faculty of Life Science and Technology Central South University of Forestry and TechnologyChangsha 410004China

Changes in litter quality(carbon:nitrogen,C:N)and above-ground biomass(AGB)following vegetation restoration significantly impact soil physicochemical properties,yet their effects on soil microbial metabolic limitations remain unclear.We measured litter quality,AGB,soil physicochemical properties,and extracellular enzyme activity(EEA)along a vegetation restoration gradient(7,14,49,70 years,and nearly climax evergreen broadleaved forests)in southern China.We also evaluated soil microbial metabolic limitations by a vector analysis of the EEA.Results revealed the soil microbial metabolisms were co-limited by C and phosphorus(P).The microbial C limitation initially decreased(before 14 years)and then increased,while the microbial P limitation initially increased(before 49 years)and then decreased.Partial least squares path modeling(PLS-PM)showed that the microbial C limitation was mainly attributed to microbial C use efficiency induced by litter quality,suggesting that microorganisms may transfer cellular energy between microbial growth and Cacquiring enzyme production.The microbial P limitation was primarily correlated with AGB-driven change in soil elements and their stoichiometry,highlighting the importance of nutrient stoichiometry and balance in microbial metabolism.The shifts between microbial C and P limitations and the strong connections of plant–soil-microbe processes during vegetation restoration revealed here will provide us with helpful information for optimal management to achieve forest restoration success.

关键词： Extracellular enzymatic stoichiometry Microbial metabolic limitations Above-ground biomass Litter quality Vegetation restoration subtropic

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Multiple processes affecting surface seawater N_2O satura-tion anomalies in tropical oceans and Prydz Bay, Antarc-tica

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Advances in Polar Science 2012年第2期23卷 87-94页

作者： CHEN Liqi ZHAN Liyang XU Suqing ZHANG Jiexia ZHANG Yuanhui XU Guojie Key Laboratory of Global Change and Marine-Atmospheric Chemistry State Oceanic Administration(SOA)Xiamen 361005China Third Institute of Oceanography SOAXiamen 361005China

We analyzed the N20 content of surface seawater sampled from Prydz Bay, Antarctica, on a cruise track between 30°S and 30°N during the twenty-second Chinese National Antarctic Research Expedition during austral summer, 2006. The surface water showed an average pN20 value of 311.9a：7.6 nL.L-1 （14.1：t：0.4 nmol-Ll）, which was slightly undersaturated. The air-sea N2O flux in the region was -0.3±0.8 p.mol.mE,dl; howeveh N20 in the surface water was oversaturated in most stations along the cruise track. Saturation anomalies were greater than 10%, with a maximum of 54.7% being observed at the Eqaator, followed by 31% at 10°N in the Sulu Sea. The air-sea fluxes at these locations were 12.4 and 4 μmol-mLd-1, respectively. Overall, the results indicated that surface water in Prydz Bay was near equilibrium with atmospheric N20, and that ocean waters in lower latitudes acted as a N20 source. Physical processes such as stratification, ice-melt water dilution, and solar radiation dominate the factors leading to N20 saturation of surface water of Prydz Bay, while biological production and upwelling are primarily responsible for the N20 oversaturation of surface water observed in subtropical and tropical regions along the cruise track.

关键词： dissolved N20 saturation anomalies tropic subtropic Prydz Bay

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Study on Peat-Forming Mechanism of Tropic and Sub-TropicTidal Flats

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International Journal of Mining Science and Technology 1997年第2期18卷 51-55页

作者：桑树勋刘焕杰施健

Tropic and sub-tropic tidal flats (generalised) are a kind of speific peat-forming environments. Taking the Mangrove tidal flats and mangrove pets in Hainan island as a example, the authors deeply study and discuss the peat-forming mechanism of tropic and sub-tropic tidal flats. The conclusions are as follows: intrusion accretiou of plant organic matter is more important ; the organic matter has accumulated witk high productivity, high return rate and high decompeition rate ;anaerobic bacterin play a more important role during early peatification ; sea level change is the fundameutal factor controlling the formation and evolution of tidal flat peat-forming environments; lagoon peat-flat and delta peat-flat are main types of tidal flat peat-forming euvironments ;tidal flat peat-forming environments are remarkably characterized by low-level and rabe properties.

关键词： mangrove tidal flat mangrove peat peat-forming mechanism tropic and subtropic zones

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东山湾的现代沉积

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厦门大学学报(自然科学版) 1987年第5期 609-614页

作者：蔡月娥蔡爱智厦门大学海洋学系

作者分析了取自东山湾海底沉积物的粒度组成、有机质和碳酸钙含量、颗粒表面特征等,结果表明:潮流和风是泥沙搬运和沉积作用的最主要动力,陆源冲积砂和风砂是东山湾沉积物的主要来源。

关键词： Terrigenus Alluvial Eoljan sand subtropic Structure Sedimentation

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