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Drought adaptability of phreatophytes:insight from vertical root distribution in drylands of China

Journal of Plant Ecology 2021年第6期14卷 1128-1142页

作者： Tian-Ye Wang Ping Wang Ze-Lin Wang Guo-Yue Niu Jing-Jie Yu Ning Ma Ze-Ning Wu Sergey P.Pozdniakov Deng-Hua Yan School of Water Conservancy Engineering Zhengzhou UniversityZhengzhouHenan 450001China Key Laboratory of Water Cycle and Related Land Surface Processes Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China College of Earth and Environmental Sciences Lanzhou UniversityLanzhou 730000China Department of Hydrology&Atmospheric Sciences University of ArizonaTucsonAZ 85738USA Biosphere 2 University of ArizonaTucsonAZ 85623USA Department of Hydrogeology Lomonosov Moscow State UniversityMoscow 119899Russia

Aims The vertical distribution of plant roots is a comprehensive result of plant adaptation to the *** knowledge on fine vertical root distributions and complex interactions between roots and environmental variables hinders our ability to reliably predict climatic impacts on vegetation *** study attempts to understand the drought adaptability of plants in arid areas from the perspective of the relationship between vertical root distribution and *** By analyzing root profiles compiled from published studies,the root vertical profiles of two typical phreatophytes,Tamarix ramosissima and Populus euphratica,and their relationships with environmental factors were investigated.A conceptual model was adopted to link the parameter distribution frequency with plant drought *** Findings The strong hydrotropism(groundwater-dependent)and flexible water-use strategy of *** and *** help both species survive in hyperarid *** differences in the developmental environments between *** and *** can be explained well by the different distribution characteristics of root *** is,higher root plasticity helps *** develop a more efficient water-use strategy and therefore survive in more diverse climatic and soil conditions than *** conclude that the higher variation in root profile characteristics of phreatophytes can have greater root adaptability to the surroundings and thus wider hydrological niches and stronger ecological *** inadequacy of models in describing root plasticity limits the accuracy of predicting the future response of vegetation to climate change,which calls for developing process-based dynamic root schemes in Earth system models.

关键词： vertical root distribution root plasticity drought adaptability phreatophytes groundwaterdependent ecosystem

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root vertical distribution is important to improve water use efficiency and grain yield of wheat

Root vertical distribution is important to improve water use...

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2017年中国作物学会学术年会

作者： Suwei Feng Shubo Gu Hongbo Zhang Dong Wang

The winter wheat(Triticum aestivum L.) production of the North China Plain is threatened by increasing water ***,the invention of effective irrigation techniques is crucial to maintain high yields of winter wheat through improved water use efficiency(WUE).In this study,field experiments were carried out in the North China Plain region in 2012-2013 and *** on the soil moisture regulation at sowing to ensure the normal emergence of the winter wheat,four supplemental irrigation(SI) regimes were set up:no-irrigation after emergence(T1),SI at jointing and anthesis(T2),SI at sowing,jointing and anthesis(T3),and SI at pre-wintering,jointing and anthesis(T4).The results showed that the root length density(RLD),root surface area density(RAD),and root weight density(RWD) in the 0-0.2 m soil layer from T2 increased rapidly after jointing and were significantly higher than those from T3 and T4 at *** of T2 in the 0.6-0.8 m and 0.8-1.0 m soil layers were also significantly higher at anthesis.T2 was significantly higher than T1 in the photosynthetic rate(Pn) and instantaneous water use efficiency(WUE) of flag leaves,post-anthesis dry matter accumulation(DMA),contribution of DMA to grain(CDMA),grain yield and WUE,but lower than T1 in the pre-anthesis dry matter remobilization efficiency(DMRE) and contribution of DMR to grain(CDMR).T2 had significantly lower plant populations and dry matter at jointing,Pn and WUE at 28 days after anthesis,DMA and CDMA,but higher dry matter increase rate after jointing,tiller survival rate,DMR,DMRE,CDMR and *** combined effect of these differences enabled T2 to have yield that was not significantly different to *** summary,SI at joining and anthesis that was based on suitable soil water content at sowing increased the absorbing area of roots in both deep and surface soil layers;accelerated the dry matter accumulation after jointing;increased the Pn and WUE of flag leaves,DMA and DMR;and finally achieved a

关键词： vertical root distribution Gas exchange characteristics Dry matter redistribution Water use efficiency Winter wheat

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root production, mortality and turnover in soil profiles as affected by clipping in a temperate grassland on the Loess Plateau

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Journal of Plant Ecology 2019年第6期12卷 1059-1072页

作者： Lin Wei Pengwei Yao Guanghua Jing Xiefeng Ye Jimin Cheng Department of Environment College of ForestryHenan Agricultural UniversityZhengzhou 450002China Department of Tobacco Science College of Tobacco ScienceHenan Agricultural UniversityZhengzhou 450002China Institute of Soil and Water Conservation Chinese Academy of Sciences and Ministry of Water ResourcesYangling 712100China

Aims Clipping or mowing for hay,as a prevalent land-use practice,is considered to be an important component of global *** production and turnover in response to clipping have great implications for the plant survival strategy and grassland ecosystem carbon ***,our knowledge about the clipping effect on root dynamics is mainly based on root living biomass,and limited by the lack of spatial and temporal *** study aim was to investigate the effect of clipping on seasonal variations in root length production and mortality and their distribution patterns in different soil layers in semiarid grassland on the Loess *** Clipping was performed once a year in June to mimic the local spring livestock grazing beginning from *** minirhizotron technique was used to monitor the root production,mortality and turnover rate at various soil depths(0–10,10–20,20–30 and 30–50 cm)in 2014(from 30 May to 29 October)and 2015(from 22 April to 25 October).Soil temperature and moisture in different soil layers were also measured during the study *** Findings Our results showed that:(i)Clipping significantly decreased the cumulative root production(Proot mortality and turnover rates of the 0–50 cm soil profile for both years.(ii)Clipping induced an immediate and sharp decrease in root length production and an increase in root length mortality in all soil ***,with plant regrowth,root production increased and root mortality decreased gradually,with the root production at a depth of 30–50 cm even exceeding the control in September–October 2014 and April–May 2015.(iii)Clipping mainly reduced root length production and increased root length mortality in the upper 0–20 cm soil profile with rapid root ***,roots at deeper soil layers were either little influenced by clipping or exhibited an opposite trend with slower turnover rate compared with the upper soil profile,leading to th

关键词： clipping root dynamics vertical root distribution seasonal variation in root growth temperate grassland

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