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Influence of slope position and aspect on the vegetation attributes and treewater relations in forests of the central Himalayas

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Journal of Mountain Science 2023年第9期20卷 2592-2602页

作者： Vidit TYAGI Surendra P.SINGH Ripu Daman SINGH Surabhi GUMBER Rajesh THADANI Rajiv PANDEY Dolphin(PG)Institute of Bio-medical and Natural Sciences Dehra Dun 248007India Central Himalayan Environment Association(CHEA) Dehradun 248007India Department of Forestry and Environmental Science DSB CampusKumaun UniversityNainital 263001India Centre for Ecology Development and Research(CEDAR) A-17 Mayfair GardensNew Delhi 110016India Indian Council of Forestry Research and Education(ICFRE) Dehra Dun 248007India

While the need for understanding the effects of topographical factors on forest structure and function is well recognized,comprehensive studies are *** study evaluates the effect of slope aspect and slope position on water relations and forest attributes across six forest types occurring between 400 m and 2600 m altitude in the Central Himalaya(27°-38°N).We found that predawn tree water potential and soil water potential were generally higher on moist north slope aspect(-0.78±0.05 MPa and-3.34±0.18 MPa,respectively)than dry south slope aspect(-0.82±0.18 MPa and-3.77±0.18 MPa,respectively).Across six different forests,these values were higher at hill base(-0.71±0.06 MPa and-2.77±0.19 MPa,tree predawn water potential and soil water potential,respectively)than other topographical *** favorable effect of north aspect and hill base was also observed in maintaining soil water and tree water potential during the dry *** attributes,such as species richness,unique species and plant density were also generally higher on north slope and hill base than southern aspect and lowest at hill *** forest types,the hill base provided shelter to 46 unique species,compared to 16-18 at the other positions,thus emphasizing its importance as refugia for species to survive climate change induced *** favorable conditions of hill base position not only contribute to increase in alpha diversity,but also to extended species distributional range.

关键词： Hill base Himalaya Refugia Unique species water relation

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water relations on Alhagi sparsifolia in the Southern Fringe of Taklamakan Desert

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Acta Botanica Sinica 2002年第10期44卷 1219-1224页

作者：李向义张希明曾凡江 Andrea FOETZKI Frank M .THOMAS 李小明 Michael RUNGE 何兴元中国科学院新疆生态与地理研究所乌鲁木齐830011 德国哥廷根大学生态与生态系统研究所哥廷根d37073 中国科学院沈阳应用生态研究所沈阳110016

water relations of Alhagi sparsifolia Shap. at the transition zone between oases and sandy desert were studied in the southern fringe of Taklamakan Desert. Results showed that A. sparsifolia maintained the positive turgor during the summer. The steady high predawn water potential (psi(P)) indicated A. sparsifolia had sufficient hydration and water supply in growing season. In July, water deficit caused by drought stress had no effect on the transpiration of A. sparsifolia. Therefore, drought stress is not a main factor affecting the survival of plants. The physiological adaptation to drought of A. sparsifolia was shown mainly at the leaf level by significant difference (DeltaII) and relative water content (RWC) between the osmotic pressure at full turgor and at turgor loss, by occurring of osmotic adjustment, by high percentage of dry mass-related water content ( WCsat), by RWC at turgor loss point ( RWCp) in stable level and low RWC of the saturated symplast (RWCsym). However, the morphological features of transpiring surface reduction and deep root system seem to be the main way for the plant to adapt to the extreme drought environment. Result also suggests that one time of irregular irrigation in summer will not be helpful to recover water status of A. sparsifolia in location where the water table is very low.

关键词： Alhagi sparsifolia water relation drought stress water potential PV parameters irrigation effect

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PV技术的计算机处理及其在树木水分关系研究中的应用

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生态学杂志 1994年第1期13卷 60-63页

作者：刘建伟刘雅荣王世绩中国林业科学研究院林业研究所

ＰＶ技术的计算机处理及其在树木水分关系研究中的应用刘建伟，刘雅荣，王世绩（中国林业科学研究院林业研究所，北京１０００９１）ＣｏｍｐｕｔｅｒＰｒｏｃｅｓｓｉｎｇｏｆＰＶＣｕｒｖｅＡｎａｌｙｓｉｓａｎｄＩｔｓＡｐｐｌｉｃ... 详细信息

ＰＶ技术的计算机处理及其在树木水分关系研究中的应用刘建伟，刘雅荣，王世绩（中国林业科学研究院林业研究所，北京１０００９１）ＣｏｍｐｕｔｅｒＰｒｏｃｅｓｓｉｎｇｏｆＰＶＣｕｒｖｅＡｎａｌｙｓｉｓａｎｄＩｔｓＡｐｐｌｉｃａｔｉｏｎｉｎｔｈｅＲｅｓｅａｒｃ...

关键词： V curve water relation Populus simonii.

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Phospholipase Dα1-mediated phosphatidic acid change is a key determinant of desiccation-induced viability loss in seeds

Phospholipase Dα1-mediated phosphatidic acid change is a ke...

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中国植物学会第十六次全国会员代表大会暨85周年学术年会

作者： Hongying Chen Xiaomei Yu Xudong Zhang Weiqi Li Germplasm Bank of Wild Species Kunming Institute of BotanyChinese Academy of Sciences

High sensitivity of seeds to water loss is a widespread phenomenon in the world’s plant *** molecular basis of this trait is poorly understood but thought to be associated with critical changes in membrane *** profiled membrane lipids of seeds in eight species with varying levels of desiccation tolerance and found a close association between reducing seed viability and increasing phosphatidic acid（PA）.We applied hydration-dehydration cycles to Arabidopsis seeds,that are normally desiccation tolerant,to mimic the onset of desiccation sensitivity with progression towards germination and examined the role of phospholipase D（PLD） in desiccation stressmigrated from the change,and that all desiccation--dehydration cycle improved significantly.-mediated PA formation modulates desiccation sensitivity as applying its inhibitor improved seed desiccation tolerance and its suppression in protoplasts enhanced survival under *** insights provided by comparative lipidomics enable us to propose a new membrane-based model for seed desiccation stress and survival.

关键词： drought water relation membrane lipid phosphatidic acid (PA) phospholipase D(PLD) seed storage behaviour

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Effects of water stress on Haloxylon ammodendron seedlings in the desert region of Heihe inland river watershed, Gansu Province, China

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Journal of Forestry Research 2003年第3期14卷 197-201页

作者：刘发民仵彦卿苏建平杜明武中国科学院寒区旱区环境与工程研究所

The water relation and leaf gas exchange of saxoul (Haloxylon Ammodendron Bge, a C4 shrub) seedlings were studied under water stress in 2001. Saxoul seedlings maintained high transpiration when the soil moisture was above 11%. The seedlings were able to take up water from soil with above 6 % soil water content, which was the threshold level of soil moisture for seedlings. The relationship between transpiration and potential evaporation was linear for well-watered seedlings. The de-crease of soil water availability led to different degrees of down-regulation of stomatal conductance, leaf transpiration and net CO2 assimilation rate. The stomata played a relatively small part in determining the net CO2 assimilation rate for the same seedling. The relationship between net CO2 assimilation rate and transpiration was linear diurnally, and reduction scale of leaf transpiration was much bigger than that of net CO2 assimilation rate by waters tress treatments, therefore intrinsic wa-ter-use-efficiency increased. High evaporative demand increased the leaf transpiration but inhibited net CO2 assimilation rate. Because of the effect of VPD on transpiration in this region, the transpiration of well-watered and mild water stress seedlings becomes responsive to change in stomatal conductance over a wider range.

关键词： Haloxylon ammodendron, water stress Leaf gas exchange water relation Stomatal conductance Seedling

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