Relationship between stomatal behavior and characteristics of photosynthesis and transpiration of Adenophora Iobophylla and A. potaninii at different altitudes

The photosynthesis and transpiration characteristics ofAdenophora Iobophylla and A. potaninii, as well as stomatal behavior such as stomatal size, stomatal density, stomatal open and stomatal conductivity were measured at different altitudes. The relationship between the photosynthesis and transpiration characteristics and the stomatal behavior was analysed by correlation coefficient and path coefficient analysis with altitude changes.The results showed that the influences of stomatal behavior were not evident on the photosynthesis and transpiration characteristics of A. Lobophylla, but evident on that of A. potaninii.     

Relationship between stomatal behavior and characteristics of photosynthesis and transpiration ofAdenophora lobophylla andA. potaninii at different altitudes

The photosynthesis and transpiration characteristics ofAdenophora lobophylla andA. potaninii, as well as stomatal behavior such as stomatal size, stomatal density, stomatal open and stomatal conductivity were measured at different altitudes. The relationship between the photosynthesis and transpiration characteristics and the stomatal behavior was analysed by correlation coefficient and path coefficient analysis with altitude changes. The results showed that the influences of stomatal behavior were not evident on the photosynthesis and transpiration characteristics ofA. Lobophylla, but evident on that ofA. potaninii. This study is supported by the National Natural Science Foundation of China (No. 39391500). Responsible editor: Zhu Hong     

Comparative study on population age structures between Adenophora lobophylla and A, potaninii

IntroductionPlantnumberdynamicdependsonthenumberofbirth,death,emigrantandimmigrant(Pielou1977,Si1vertown1982).TheplantagestructureistheresuItofinteractionbetWeentheplantviabilityandtheenvi-ronmentalfactors(Grawley1991).Studyontheen-dangeredpfantpopuIationagestructureisverysig-nificantforappraisingthepopuIationdynamicandpopuIationdevelopingtendency.ltnotonlyexplainsthepopuIationstatusbutaIsoprovidesthescientificreferenceforconservation.Theworksontheendangeredplantpopulationdynamichavebeenca…     

Effect of shading treatment on stomatal behavior ofAdenophora lobophylla at different ages

The stomatal behavior ofAdenophora lobophylla of different age structures was studied in July 1995 in greenhouse of the Harbin Forest Farm of Northeast Forestry University by means of shading experiment. The effects of different shading treatments on the stomatal physiological character and ecological adaptation ofA. lobophylla of different ages were compared. The results showed that the morphological characters of annualA. lobophylla were more obvious than that of the perennial, but the stomatal density of annual was less than that of perennial. Growth of annualA. lobophylla was more sensitive to the change of environment than that of the perennial. The ecological adaptation of annual was weak, which was one of the main causes of endangered population. Foudation Item: This syudy is supported by the National Natural Science Foundation of China (No. 39391500).     

Effect of shading treatment on stomatal behavior of Adenophora lobophylla at different ages

The stomatal behavior of Adenophora lobophylla of different age structures was studied in July 1995 in greenhouse of the Harbin Forest Farm of Northeast Forestry University by means of shading experiment. The effects of different shading treatments on the stomatal physiological character and ecological adaptation of A. lo-bophylla of different ages were compared. The results showed that the morphological characters of annual A. lo-bophylla were more obvious than that of the perennial, but the stomatal density of annual was less than that of perennial. Growth of annual A. lobophylla was more sensitive to the change of environment than that of the peren-nial. The ecological adaptation of annual was weak, which was one of the main causes of endangered population.     

Analysis and Comparison on Population Dynamics between Adenophora lobophylla and Adenophora potaninii by Leslie Matrix

Intr0ducti0nTheprediction0fpopLIIatiol1dy11a111icsisal1i111p0rtal1tcomp0nenti11conservationbioIogyofel1da11geredpIal1t.ItcouIdnotonlyexplaintl1ee11dangeredstattIS0ftl1eplantpopuIatiot1butaIsoprovidetl1esciel1tificevidcI1ceandtheguida11cefor111akil1gtI1epl.otectivepIal1(Jia11Zhiga11getal.,1997).TI1econ1pariso11oftl1epol)tlIati()11dynamicam011gtl1ediffere11tpopuIatiOI1sorsI,ecicscouIdmakeitpossibIetoa11aIyzetl1eexterl1aIe11vir()t1-me11taIc0nditi011a11dtl1eil1tril1sicI11crl1al1iSI11sw…     

Gas exchange responses of <Emphasis Type="Italic">Eucalyptus</Emphasis>, <Emphasis Type="Italic">C. africana</Emphasis> and <Emphasis Type="Italic">G. robusta</Emphasis> to varying soil moisture content in semi-arid (Thika) Kenya

A dramatic decline in forest cover in eastern Africa along with a growing population means that timber and poles for building and fuelwood are in short supply. To overcome this shortage, the region is increasingly turning to eucalyptus. But eucalyptus raises environmental concerns of its own. Fears that it will deplete water supply, affect wildlife and reduce associated crop yields have caused many countries in the region to discourage farmers from planting this exotic. This paper is part of a series of investigations on the growth and water use efficiency of faster growing eucalyptus hybrids, which was introduced from South Africa to Kenya. The hypothesis is that the new hybrids are more efficient in using water and more suitable for the semi-arid tropics than existing eucalyptus and two popular agroforestry species. Gas exchange characteristics of juvenile Eucalyptus grandis (W. Hill ex Maiden), two eucalyptus hybrids (E. grandis × Eucalyptus camaldulensis Dehnh.), Grevillea robusta (A. Cunn) and Cordia africana (Lam) was studied under field and pot conditions using an infrared gas analyzer was used to measure photosynthetic active radiation (PAR), net photosynthetic rate (A), stomatal conductance (g _s) and transpiration rate (E) at CO₂ concentrations of 360 μmol mol⁻¹ and ambient humidity and temperature. A, E and g _s varied between species, being highest in eucalyptus hybrid GC 15 (24.6 μmol m⁻² s⁻¹) compared to eucalyptus hybrid GC 584 (21.0 μmol m⁻² s⁻¹), E. grandis (19.2 μmol m⁻² s⁻¹), C. africana (17.7 μmol m⁻² s⁻¹) and G. robusta (11.1 μmol m⁻² s⁻¹). C. africana exhibited high E values (7.0 mmol m⁻² s⁻¹) at optimal soil moisture contents than G. robusta (3.9 mmol m⁻² s⁻¹) and eucalyptus (5.3 mmol m⁻² s⁻¹) in field experiment and G. robusta (3.2 mmol m⁻² s⁻¹) and eucalyptus (4.2 mmol m⁻² s⁻¹) in pot-grown trees. At very low soil moisture content, extremely small g _s values were recorded in GC 15 and E. grandis (8 mmol m⁻² s⁻¹) and G. robusta (14 mmol m⁻² s⁻¹) compared to GC 584 (46.9 mmol m⁻² s⁻¹) and C. africana (90.0 mmol m⁻² s⁻¹) indicating strong stomatal control by the species. Instantaneous water use efficiency ranged between 3 and 5 μmol mmol⁻¹ and generally decreased with decline in soil moisture in pot-grown trees but increased with declining soil moisture in field-grown trees.     

不同桤木品系蒸腾速率动态特征及差异性研究

对桤木品系蒸腾速率动态特征及差异性研究结果表明:①四川桤木品系苗木上、下部叶的蒸腾速率(Tr)日变化有单峰与双峰两种类型,而下部叶以单峰型曲线为主.②四川桤木属轻蒸腾午休型、耗水型植物,对水分要求较高,在引种过程中,应注意引种地的降水条件和土壤水分条件.③树冠上、下部叶、各品系之间和月份间的蒸腾速率(Tr)差异极显著....     

Effects of nest hoarding on foraging behavior of two species of Apodemus mice,A. speciosus and A. argenteus (Rodentia: Muridae)

Food hoarding is one of the determinant factors of foraging behavior and benefits the hoarder. Two species of Apodemus mice, A. speciosus Temminck and A. argenteus Temminck, hoard acorns for later use. In 1988 and 1989, I conducted laboratory experiments to reveal the effects of food hoarding in the nest on the foraging behavior of these mice. I released a mouse into an indoor arena (2.8 × 2.8m) and recorded the foraging behavior of four female A. speciosus and four female A. argenteus mice in sessions with and without food hoarding in the nest box. Nest hoarding did not affect the time that a mouse allotted to excursions or the number of peanuts that a mouse ate during the night, but decreased the number of peanuts handled and the intensity of food handling (the number of handled peanuts per visit) at the food stations. The decrease in food handling outside the nest box, which seemed to be beneficial to the survival and reproduction of the hoarder in the field, was more apparent in A. speciosus than in A. argenteus. The different behavioral responses in foraging behavior to nest hoarding between two Apodemus mice may be related to their different microhabitat preferences.     

白蜡早春萌芽期树木含水量与枝条颜色变化关系分析

文中分析白蜡早春萌芽期含水量与枝条颜色变化的关系,用以从外观上判断早春萌芽情况。试验结果表明,枝条含水量随萌发进程而变化,在芽萌发前期枝条的含水量急剧下降,之后随芽的萌发含水量增加,枝条颜色随含水量与芽萌发进程呈现出明显的变化。