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Seasonal and spatial variation in species diversity, abundance, and element accumulation capacities of macroalgae in mangrove forests of Zhanjiang, China

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Acta Oceanologica Sinica 2014年第8期33卷 73-82页

作者： ZHANG Yubin LI Yuan SHI Fei SUN Xingli lin guanghui Monitoring Center for Marine Resources and Environments Guangdong Ocean University Graduate School at Shenzhen Tsinghua University

The objective of this study was to investigate whether there was distinctive seasonal and zonal variation in the species diversity, biomass, and element accumulation capacities of macroalgae in two major intertidal mangrove stand types （Avicennia marina assemblage andSonneratia apetala assemblage） in the Zhanjiang region of southern China. Over a year, 31 species in 15 genera were identified in both mangrove assem-blages, of which the dominant species wereCladophoropsis zollingeriand Enteromorpha ***-gal species were significantly most abundant in spring （p〈0.05）, followed by summer, winter, and autumn. Variation in the zonal distribution of macroalgal species was conspicuous in both intertidal mangrove as-semblages, with the greatest abundance in the middle zone, and the least in the front zone. Patterns in the seasonal and zonal variation in macroalgal biomass in theS. apetalaassemblage were similar to those of macroalgal species diversity in both mangrove assemblages. The seasonal patterns in tissue concentrations of 15 analyzed elements were not uniform among the macroalgaeC. zollingeri,E. clathrata, andGracilaria salicornia in theA. marina assemblage. All three species exhibited variation in their responses to ambient concentrations of different elements, implying their differential ability to absorb and selectively accumulate certain elements.

关键词： mangrove macroalgae seasonal variation intertidal biomass element concentration

Responses of soil respiration to simulated precipitation pulses in semiarid steppe under different grazing regimes

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Journal of Plant Ecology 2008年第4期1卷 237-246页

作者： Shiping Chen guanghui lin Jianhui Huang Mao He State Key Laboratory of Vegetation and Environmental Change Institute of BotanyChinese Academy of SciencesBeijing 100093China

Aims Precipitation pulses and different land use practices(such as grazing)play important roles in regulating soil respiration and carbon balance of semiarid steppe ecosystems in Inner ***,the interactive effects of grazing and rain event magnitude on soil respiration of steppe ecosystems are still *** conducted a manipulative experiment with simulated precipitation pulses in Inner Mongolia steppe to study the possible responses of soil respiration to different precipitation pulse sizes and to examine how grazing may affect the responses of soil respiration to precipitation *** Six water treatments with different precipitation pulse sizes(0,5,10,25,50 and 100 mm)were conducted in the ungrazed and grazed sites,*** patterns of soil respiration of each treatment were determined continuously after the water addition *** Findings Rapid and substantial increases in soil respiration occurred 1 day after the water treatments in both sites,and the magnitude and duration of the increase in soil respiration depended on pulse *** positive relationships between the soil respiration and soil moisture in both sites suggested that soil moisture was the most important factor responsible for soil respiration rate during rain pulse *** ungrazed site maintained significantly higher soil moisture for a longer time,which was the reason that the soil respiration in the ungrazed site was maintained relatively higher rate and longer period than that in the grazed site after a rain *** significant exponential relationship between soil temperature and soil respiration was found only in the plots with the high water addition treatments(50 and 100 mm).Lower capacity of soil water holding and lower temperature sensitivity of soil respiration in the grazed site indicated that degraded steppe due to grazing might release less CO_(2) to the atmosphere through soil respiration under future precipitation an

关键词： soil CO_(2)efflux degraded steppe precipitation pulse size Q10 value

Methylmercury and sulfate-reducing bacteria in mangrove sediments from Jiulong River Estuary,China

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Journal of Environmental Sciences 2011年第1期23卷 14-21页

作者： Hao Wu Zhenhua Ding Yang Liu Jinling Liu Haiyu Yan Jiayong Pan Liuqiang Li Huina lin guanghui lin Haoliang Lu Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems and School of Life Sciences Xiamen University Xiamen 361005 China State Key Laboratory of Environmental Geochemistry Institute of Geochemistr) Chinese Aeademy of Sciences Guiyang 550002 China Key Laboratory of Nuclear Resources and Environment East China Institute of Technology Minist~ of Education Nanchang 330013 China

Estuaries are important sites for mercury （Hg） methylation, with sulfate-reducing bacteria （SRB） thought to be the main Hg methylators. Distributions of total mercury （THg） and methylmercury （MeHg） in mangrove sediment and sediment core from Jiulong River Estuary Provincial Mangrove Reserve, China were determined and the possible mechanisms of Hg methylation and their controlling factors in mangrove sediments were investigated. Microbiological and geochemical parameters were also determined. Results showed that SRB constitute a small fraction of total bacteria （TB） in both surface sediments and the profile of sediments. The content of THg, MeHg, TB, and SRB were （350 ± 150） ng/g, （0.47 ± 0.11） ng/g, （1.4× 10^011 ± 4.1 × 10^9） cfu/g dry weight （dw）, and （5.0× 10^6 d： 2.7 × 10^6） cfu/g dw in surficial sediments, respectively, and （240 ± 24） ng/g, （0.30 ± 0.15） ng/g, （1.9 × 10^11 ± 4.2 × 10^9） cfu/g dw, and （1.3 × 10^6 ± 2.0 × 10^6） cfu/g dw in sediment core, respectively. Results showed that THg, MeHg, TB, MeHg/THg, salinity and total sulfur （TS） increased with depth, but total organic matter （TOM）, SRB, and pH decreased with depth. Concentrations of MeHg in sediments showed significant positive correlation with THg, salinity, TS, and MeHg/THg, and significant negative correlation with SRB, TOM, and pH. It was concluded that other microbes, rather than SRB, may also act as main Hg methylators in mangrove sediments.

关键词： mercury methylmercury sediment mangrove sulfate-reducing bacteria

Biophysical regulations of NEE light response in a steppe and a cropland in Inner Mongolia

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Journal of Plant Ecology 2012年第2期5卷 238-248页

作者： Ping Zhang Shiping Chen Wenli Zhang Haixia Miao Jiquan Chen Xingguo Han guanghui lin Institute of Botany The Chinese Academy of SciencesState Key Laboratory of Vegetation and Environmental ChangeBeijing 100093People’s Republic of China Graduate University of Chinese Academy of Sciences Beijing 100049People’s Republic of China College of Chemistry and Life Science China Three Gorges UniversityYi ChangHubei 443002People’s Republic of China Department of Environmental Sciences University of ToledoToledoOH 43606USA Research Center for Earth System Science Tsinghua UniversityBeijing 100084People’s Republic of China

Aims Ecosystem carbon models often require accurate net ecosystem exchange of CO_(2)(NEE)light-response parameters,which can be derived from the Michaelis–Menten *** parameters include maximum net ecosystem exchange(NEE_(max)),apparent quantum use efficiency(a)and daytime ecosystem respiration rate(R_(e)).However,little is known about the effects of land conversion between steppe and cropland on these parameters,especially in semi-arid *** understand how these parameters vary in responses to biotic and abiotic factors under land conversions,seasonal variation of light-response parameters were evaluated for a steppe and a cropland of Inner Mongolia,China,during three consecutive years(2006–08)with different precipitation *** NEE was measured over a steppe and a cropland in Duolun,Inner Mongolia,China,using the eddy covariance technique,and NEE light-response parameters(NEE_(max),α and R_(e))were derived using the Michaelis–Menten *** regulations of these parameters were evaluated using a stepwise regression *** Findings The maximum absolute values of NEE_(max) occurred in the meteorological regimes of 15℃

关键词： climate change ecosystem respiration land-use conversion net ecosystem exchange quantum use efficiency

树年轮纤维素稳定同位素比率的生态学意义(英文)

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植物生态学报 2002年第3期26卷 381-384页

作者： lin guanghui Rolf Siegwolf Biosphere 2 Center of Columbia University 32540 S. Biosphere Road 美国 Laboratory of Atmospheric Chemistry Stable Isotope Research Group/Ecosystem Fluxes Paul Scherrer Institute CH-5232 Villigen-PSI 瑞士

Stable isotope ratios in tree-ring cellulose have bee shown to be reliable recorders of changes in the ambient climate (Leuenberger et al., 1998). thus, isotopic fractionations associated with both physical and biochemical processes during cellulose synthesis in higher plants (Epstein & Krishnaumurthy, 1990; Roden et al., 2000; Saucer et al., 1997a; 1997b; 2000) can be used as archives for past climatic indicators. Superimposed on the climatic inducedisotopic signal are the long-term responses of plant physiological processes to past changes in environmental conditions including CO_2 enrichment.

关键词：树年轮纤维素稳定同位素比率生态学气候变化

Effect of rain enrichment on soil respiration of Nitraria sphaerocarpa community in a hyperarid area

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Research in Cold and Arid Regions 2013年第6期5卷 722-732页

作者： DianJun Liu Bo Wu YongHua Li guanghui lin ShiPing Chen YaJuan Zhu Qi Lu Bin Yao Institute of Desertification Studies Key Laboratory of Tree Breading and Cultivation of State Forestry AdministrationChinese Academy of Forestry Inner Mongolia Hydraulic Research Institute Center for Earth System Science Tsinghua University State Key Laboratory of Vegetation and Environmental Change Institute of Botany Chinese Academy of Sciences

In order to analyze the effect of rain enrichment on soil respiration rate of a Nitraria sphaerocarpa community, we measured soil respiration rate in bare and vegetated areas in a hyperarid area （Dunhuang） during the growing season. Results show that rain enrichment can increase bare and vegetated soil respiration rates. The more rainfall enrichment, the greater the increment and the longer duration time effect for soil respiration rate. 200% （16 mm） and 300% （24 mm） of rain enrichment can significantly increase bare soil respiration rates by 90% and 106% （P〈0.01）, respectively. By contrast, areas with 100% （8 mm）, 200% （16 mm） and 300% （24 mm） of rain enrichment can significantly increase shrub area respiration rates by 68%, 157% and 205% （P〈0.01）, respectively. The response time of bare and vegetated soil respiration to rainfall enrichment is asynchronous. Response variable of soil respiration in vegetated soil is higher （118%） than in bare soil. There was significant positive correlation between soil respiration rate and soil water content during the growing season （P〈0.01）. For every 1 mm increment of precipitation, soil respiration rate increased by 0.01 and 0.04 pmol/（m2.s）, respectively in vegetated and bare soils.

关键词： soil respiration rain enrichment Nitraria sphaerocarpa soil water content

集体资产股权设置与管理模式的法律重构和效力解析

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山东社会科学 2022年第2期 56-66页

作者：林广会烟台大学法学院山东烟台264005

农村集体产权制度改革中的集体资产股权问题涉及股权设置和股权管理两个重要层面。股权设置应体现股权与法人资本的关联性,故应摈弃集体股,并以公积公益金制度代替。在成员股中,应合理选择以人口股或劳龄股为主体的股权配置模式,避免设... 详细信息

农村集体产权制度改革中的集体资产股权问题涉及股权设置和股权管理两个重要层面。股权设置应体现股权与法人资本的关联性,故应摈弃集体股,并以公积公益金制度代替。在成员股中,应合理选择以人口股或劳龄股为主体的股权配置模式,避免设置福利股。股金价值对于集体收益分配不具有实际意义,表明“静态管理”和“动态管理”之争是一个伪命题,动静结合(实质为动态管理)应是股权管理模式顺应人口变化的当然策略。集体资产股权的静态效力不仅及于折股量化资产,亦及于集体全部资产。股权变动涉及土地承包经营权的处置问题,应促使股权退出与承包地退回协调一致。

关键词：农村集体产权股权设置股权管理股权效力集体股

Changes of photosynthetic capacity of some plant species under very high CO_2 concentrations in Biosphere 2

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Chinese Science Bulletin 1997年第10期42卷 859-864页

作者： JIANG Gaoming and lin guanghui1. Ecological Research Center, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China 2. Biosphere 2 Research and Education Center, Columbia University, PO Box 689, Oracle, Arizona 85623, USA Ecological Research Center Institute of Botany Chinese Academy of Sciences Beijing China Biosphere 2 Research and Education Center Columbia University Oracle USA

THE responses of plant photosynthesis to elevated CO2 could be divided into short-term re-sponse and long-term response or *** the short-term response,photosynthesiscan be enhanced at the beginning of high CO2 treatment for most C3 carbon fixation species,but the photosynthetic rate may decrease when the plants are exposed to that high CO2 for

关键词： photosynthesis light compensation and saturation points apparent maximum quantum yield of CO2 fixation CO2 Biosphere 2.

典型红树林生态系统藻类多样性及其在生态过程中的作用

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生物多样性 2018年第11期26卷 1223-1235页

作者：高宇林光辉清华大学地球系统科学系地球系统数值模拟教育部重点实验室北京100084 全球变化与中国绿色发展协同创新中心北京100875 清华大学深圳研究生院海洋科学与技术学部广东深圳518055

藻类是红树林生态系统重要的生物类群, 根据生态习性可分为浮游植物、底栖微藻和大型藻类三个生态类群, 它们在红树林生态系统生物多样性、初级生产、元素循环等方面起着重要作用。但在红树林生态系统中, 关注重点多集中在红树植物和动... 详细信息

藻类是红树林生态系统重要的生物类群, 根据生态习性可分为浮游植物、底栖微藻和大型藻类三个生态类群, 它们在红树林生态系统生物多样性、初级生产、元素循环等方面起着重要作用。但在红树林生态系统中, 关注重点多集中在红树植物和动物, 对其中的藻类重视不够, 且多数研究集中在近20年以及亚洲的红树林区。事实上, 红树林生态系统藻类非常丰富, 其多样性研究有助于深入揭示红树林生态系统的结构与功能。本文介绍了红树林生态系统藻类的组成类群及其重要性, 重点对红树林区浮游植物、底栖硅藻和大型海藻的种类组成、地理分布及其与初级生产力、水质污染、元素循环、碳库形成等生态过程中的作用的研究动态和进展等进行了总结。根据已有研究, 红树林区浮游植物和底栖硅藻的种类数一般为几十到上百种, 其中硅藻在种类和数量上都占绝对优势, 它们是重要的初级生产者、饵料生物和水质污染指示生物; 红树林区底栖大型藻类主要由红藻、绿藻、褐藻、蓝藻组成, 绿藻的种类较多, 红藻在数量上占优势; 藻类是红树林湿地碳库的重要贡献者, 在红树林湿地生态系统碳汇和碳循环中起重要作用。红树林生态系统是个高度动态和异质的系统, 今后应加强红树林藻类多样性的长周期、大尺度变化及不同生境藻类的综合研究, 关注大陆径流和潮汐对藻类多样性和蓝碳的影响, 借助沉积物藻类记录, 探明红树林区藻类的长周期变化, 反演气候变化和人类活动对红树林生态系统的影响过程和机制。

关键词：浮游植物底栖藻类红树林区种类组成地理分布