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Changes in individual plant traits and biomass allocation in alpine meadow with elevation variation on the Qinghai-Tibetan Plateau

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Science China(Life Sciences) 2010年第9期53卷 1142-1151页

作者： MA WeiLing SHI PeiLi LI WenHua he yongtao ZHANG XianZhou SheN ZhenXi CHAI SiYue Lhasa National Ecological Research Station Key Laboratory of Ecosystem Network Observation and ModelingInstitute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China Graduate University of Chinese Academy of Sciences Beijing 100049China

Plant traits and individual plant biomass allocation of 57 perennial herbaceous species,belonging to three common functional groups (forbs,grasses and sedges) at subalpine (3700 m ASL),alpine (4300 m ASL) and subnival (≥5000 m ASL) sites were examined to test the hypothesis that at high altitudes,plants reduce the proportion of aboveground parts and allocate more biomass to belowground parts,especially storage organs,as altitude increases,so as to geminate and resist environmental ***,results indicate that some divergence in biomass allocation exists among *** increasing altitude,the mean fractions of total biomass allocated to aboveground parts *** mean fractions of total biomass allocation to storage organs at the subalpine site (7%±2% S.E.) were distinct from those at the alpine (23%±6%) and subnival (21%±6%) sites,while the proportions of green leaves at all altitudes remained almost *** 4300 m and 5000 m,the mean fractions of flower stems decreased by 45% and 41%,respectively,while fine roots increased by 86% and 102%,*** leaf areas and leaf areas of forbs and grasses deceased with rising elevation,while sedges showed opposite *** all three functional groups,leaf area ratio and leaf area root mass ratio decreased,while fine root biomass increased at higher *** allocation patterns of alpine plants were characterized by a reduction in aboveground reproductive organs and enlargement of fine roots,while the proportion of leaves remained *** was beneficial for high altitude plants to compensate carbon gain and nutrient uptake under low temperature and limited nutrients by stabilizing biomass investment to photosynthetic structures and increasing the absorption surface area of fine *** contrast to forbs and grasses that had high mycorrhizal infection,sedges had higher single leaf area and more root fraction,especially fine roots.

关键词： Qinghai-Tibetan Plateau climate stress biomass allocation shoot/root ratio plant traits fine roots

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The relative controls of temperature and soil moisture on the start of carbon flux phenology and net ecosystem production in two alpine meadows on the Qinghai-Tibetan Plateau

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Journal of Plant Ecology 2020年第2期13卷 247-255页

作者： Xi Chai Peili Shi Minghua Song Ning Zong yongtao he Yingnian Li Xianzhou Zhang Yanjiao Liu Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of Science11ADatun RoadChaoyang DistrictBeijing 100101China College of Resources and Environment University of Chinese Academy of SciencesNo.80 Zhongguancun East RoadHaidian DistrictBeijing 100190China Northwest Institute of Plateau Biology Chinese Academy of SciencesNo.23 Xinning roadXiningQinghai Province 810008China Beijing Zhongnong Futong Horticulture Co. Ltd.No.17 Qinghua East RoadHaidian DistrictBeijing 100083China

Aims Variations in vegetation spring phenology are widely attributed to temperature in temperate and cold ***,temperature effect on phenology remains elusive in cold and arid/semiarid ecosystems because soil water condition also plays an important role in mediating *** We used growing degree day(GDD)model and growing season index(GSI)model,coupling minimum temperature(T_(min))with soil moisture(SM)to explore the influence of heat requirement and hydroclimatic interaction on the start of carbon uptake period(SCUP)and net ecosystem productivity(NEP)in two alpine meadows with different precipitation regimes on the Qinghai-Tibet Plateau(QTP).One is the water-limited alpine steppe-meadow,and the other is the temperature-limited alpine *** Findings We observed two clear patterns linking GDD and GSI to SCUP:SCUP was similarly sensitive to variations in preseason GDD and GSI in the humid alpine shrub-meadow,while SCUP was more sensitive to the variability in preseason GSI than GDD in the semiarid alpine *** divergent patterns indicated a balance of the limiting climatic factors between temperature and water *** the humid meadow,higher temperature sensitivity of SCUP could maximize thermal benefit without drought stress,as evidenced by the stronger linear correlation coefficient(R2)and Akaike’s information criterion(AIC)between observed SCUPs and those of simulated by GDD ***,greater water sensitivity of SCUP could maximize the benefit of water in semiarid steppe-meadow,which is indicated by the stronger R2 and AIC between observed SCUPs and those of simulated by GSI ***,although SCUPs were determined by GDD in the alpine shrub-meadow ecosystem,NEP was both controlled by accumulative GSI in two alpine *** study highlights the impacts of hydroclimatic interaction on spring carbon flux phenology and vegetation productivity in the humid and semiarid alpine *** resu

关键词： growing degree day growing season index the start of carbon uptake period net ecosystem production alpine meadows Qinghai-Tibet Plateau

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Discovery of Marine-terrestrial Transitional Facies Shale Gas in Taiyuan Formation of Zhenjia 1 Well,Northern Shaanxi,Ordos basin

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Acta Geologica Sinica(English Edition) 2017年第3期91卷 1141-1142页

作者： ZHANG Yongsheng ZheNG Mianping XING Enyuan LI Yangchi GUI Baoling SHI Lizhi he yongtao WANG Linlin PENG Yuan ZHAO Haitong Institute of Mineral Resources Chinese Academy of Geological Sciences MLR Key Laboratory of Saline Lake Resources and Environments Institute of Mineral ResourcesCAGS Shaanxi Centrealoil Technology Development Co. Ltd

Objective At present, there is controversy regarding the existence of marine-terrestrial transitional facies that can act as a source of shale gas. This detailed study of Carboniferous-Permian age geological data from the northern Shaanxi area （China） provides new insight for this type of shale gas. In addition, a new deposition and accumulation pattern for this type of shale gas is established.

关键词： of as is on it Discovery of Marine-terrestrial Transitional Facies Shale Gas in Taiyuan Formation of Zhenjia 1 Well,Northern Shaanxi,Ordos basin in

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Influences of drought on the stability of an alpine meadow ecosystem

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Ecosystem health and Sustainability 2022年第1期8卷 511-522页

作者： Tao Zhang Ximeng Ji Mingjie Xu Guang Zhao Zhoutao Zheng Yuanyuan Tang Ning Chen Juntao Zhu yongtao he Yangjian Zhang College of Agronomy Shenyang Agricultural UniversityShenyangLiaoningChina Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijingChina Key Laboratory of Wetland Ecology and Environment Northeast Institute of Geography and AgroecologyChinese Academy of SciencesChangchunJilinChina Chinese Academy of Sciences Center for Excellence in Tibetan Plateau Earth SciencesBeijingChina College of Resources and Environment University of Chinese Academy of SciencesBeijingChina

Drought plays a prominent role in affecting ecosystem stability and ecosystem *** on eddy covariance and climatic observations during 2012-2020,the Fisher discriminant analysis method was employed to accurately detect drought ***,the ecosystem water sensitivity and its resistance to drought were quantified to evaluate the ecosystem *** results showed that the alpine meadow suffered drought most frequently at the beginning of the growing ***,drought during the peak growing seasons reduced the gross primary productivity(GPP)the most,by 30.5±15.2%.In the middle of the peak growing seasons,the ecosystem water sensitivity was weak,and thus,the resistance to drought was strong,which resulted in high ecosystem *** the beginning and end of the peak growing seasons,the ecosystem stability was relatively *** stability was positively related to the corresponding multiyear average soil water content(SWC_(ave)).However,drought occurring during high SWC_(ave)periods led to larger reductions in GPP,which indicated that the inhibitory effects of drought on ecosystems were more dependent on the occurrence time of droughts than on ecosystem stability.

关键词： Water sensitivity resistance grassland Tibetan Plateau Fisher discriminant analysis

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紧支撑的最小能量框架

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计算数学 2011年第2期33卷 165-176页

作者：何永滔中山大学数学与计算科学学院广州510275

基于仿酉矩阵扩充方法,本文构造了一维d带紧支撑的最小能量框架,给出了一维d带紧支撑最小能量框架的显式构造算法.所构造的最小能量框架的支撑不超过尺度函数的支撑.当所给的尺度函数具有对称性时,研究了紧支撑对称最小能量框架的结构.... 详细信息

基于仿酉矩阵扩充方法,本文构造了一维d带紧支撑的最小能量框架,给出了一维d带紧支撑最小能量框架的显式构造算法.所构造的最小能量框架的支撑不超过尺度函数的支撑.当所给的尺度函数具有对称性时,研究了紧支撑对称最小能量框架的结构.最后,构造了两个算例.

关键词：最小能量框架多相位分解两尺度符号框架多分辨分析

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N维2带小波紧框架的构造

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系统科学与数学 2010年第10期30卷 1368-1378页

作者：何永滔中山大学数学与计算科学学院广州510275

给出了m个函数生成N维2带小波紧框架的充分条件和N维2带小波紧框架的显式构造算法,讨论了小波紧框架的分解算法与重构算法.提出的构造方法很有普遍性,容易推广到N(N(?)2)维M(M(?)2)带小波紧框架的情形,也可以得到类似的小波紧框架的分... 详细信息

给出了m个函数生成N维2带小波紧框架的充分条件和N维2带小波紧框架的显式构造算法,讨论了小波紧框架的分解算法与重构算法.提出的构造方法很有普遍性,容易推广到N(N(?)2)维M(M(?)2)带小波紧框架的情形,也可以得到类似的小波紧框架的分解算法与重构算法.

关键词：小波紧框架尺度函数框架多分辨分析

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二维3带插值型的尺度函数

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高等学校计算数学学报 2012年第1期34卷 87-96页

作者：何永滔中山大学数学与计算科学学院

1引言众所周知,在实际应用中用小波处理信号时,小波的对称性能使信号避免失真,小波的紧支撑性使得快速小波变换的和是有限和,小波的正交性能够保持能量等等,因而构造

关键词： interpolating scaling function orthogonal scaling function multi-resolution analysis two-scale symbol

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3带紧支撑的正交小波

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数值计算与计算机应用 2011年第4期32卷 243-252页

作者：何永滔中山大学数学与计算科学学院广州510275

本文首先通过Householder矩阵扩充构造了3带紧支撑的正交小波.当尺度函数具有紧支撑对称正交性时,本文通过仿酉矩阵对称扩充构造了3带紧支撑对称的正交小波,并且研究了所构造对称小波的结构.所构造小波函数的支撑不超过尺度函数的支撑,... 详细信息

本文首先通过Householder矩阵扩充构造了3带紧支撑的正交小波.当尺度函数具有紧支撑对称正交性时,本文通过仿酉矩阵对称扩充构造了3带紧支撑对称的正交小波,并且研究了所构造对称小波的结构.所构造小波函数的支撑不超过尺度函数的支撑,构造方法容易推广到一般d带的情形.另外,本文还给出了容易实施的显式构造算法.最后,给出了构造算例.

关键词： Householder矩阵两尺度符号多相位分解仿酉矩阵扩充.

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Biotic effects dominate the inter-annual variability in ecosystem carbon exchange in a Tibetan alpine meadow

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Journal of Plant Ecology 2022年第5期15卷 882-896页

作者： Mingjie Xu Yi Sun Tao Zhang Yangjian Zhang Juntao Zhu yongtao he Liwei Wang Guirui Yu College of Agronomy Shenyang Agricultural UniversityShenyang 110866China Huludao Meteorological Bureau of Liaoning Province Huludao 125080China Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China Center for Excellence in Tibetan Plateau Earth Sciences Chinese Academy of SciencesBeijing 100101China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China

The alpine meadow ecosystem in Tibet is fragile and sensitive,and its carbon sink function with respect to climate change has become a matter of widespread ***,this study aims to clarify the inter-annual variations(IAVs)in the carbon fluxes in an alpine meadow and to further quantify the contributions of the driving factors to the *** on 7 years of flux data(2012-2018)and the corresponding climatic and biotic data,a set of look-up tables was used to separate and quantify the IAV ***,linear perturbation analyses were employed to quantify the contributions of each key *** 2012-2018,the net ecosystem productivity(NEP),gross primary productivity(GPP)and ecosystem respiration(Re)of this alpine meadow were 3.31±26.90,210.18±48.35 and 206.88±28.45 g C m^(-2) y^(-1),respectively,which indicated relatively large *** the contributions of climatic and biotic effects were distinguished and quantified,the dominant effects of biotic factors ***,negative interactions between climatic and biotic effects were *** the climatic factors,only soil water content contributed relatively more to the IAVs and played a role in regulating the interactions between climatic and biotic *** results suggest that biotic effects must be carefully considered to reduce the uncertainties associated with future carbon flux estimates.

关键词： biotic controls climatic controls carbon flux productivity grassland

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Net ecosystem CO_2 exchange and controlling factors in a steppe——Kobresia meadow on the Tibetan Plateau

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Science China Earth Sciences 2006年第S2期49卷 207-218页

作者： SHI Peili, SUN Xiaomin, XU Lingling, ZHANG Xianzhou, he yongtao, ZHANG Dongqiu & YU Guirui Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China Graduate University of Chinese Academy of Sciences, Beijing 100039, China 1. Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China2. Graduate University of Chinese Academy of Sciences Beijing 100039 China

Knowledge of seasonal variation of net ecosystem CO2 exchange (NEE) and its biotic and abiotic controllers will further our understanding of carbon cycling process, mechanism and large-scale modelling. Eddy covariance technique was used to measure NEE, biotic and abiotic factors for nearly 3 years in the hinterland alpine steppe--Korbresia meadow grassland on the Tibetan Plateau, the present highest fluxnet station in the world. The main objectives are to investigate dynamics of NEE and its components and to determine the major controlling factors. Maximum carbon assimilation took place in August and maximum carbon loss occurred in November. In June, rainfall amount due to monsoon climate played a great role in grass greening and consequently influenced interannual variation of ecosystem carbon gain. From July through September, monthly NEE presented net carbon assimilation. In other months, ecosystem exhibited carbon loss. In growing season, daytime NEE was mainly controlled by photosynthetically active radiation (PAR). In addition, leaf area index (LAI) interacted with PAR and together modulated NEE rates. Ecosystem respiration was controlled mainly by soil temperature and simultaneously by soil moisture. Q10 was negatively correlated with soil temperature but positively correlated with soil moisture. Large daily range of air temperature is not necessary to enhance carbon gain. Standard respiration rate at referenced 10℃(R10) was positively correlated with soil moisture, soil temperature, LAI and aboveground biomass. Rainfall patterns in growing season markedly influenced soil moisture and therefore soil moisture controlled seasonal change of ecosystem respiration. Pulse rainfall in the beginning and at the end of growing season induced great ecosystem respiration and consequently a great amount of carbon was lost. Short growing season and relative low temperature restrained alpine grass vegetation development. The results suggested that LAI be usually in a low le

关键词： Tibetan Plateau alpine steppe--Kobresia meadow NEE ecosystem respiration PAR soil moisture temperature response LAI eddy covariance.

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