C₄ plant species and geographical distribution in relation to climate in the desert vegetation of China     

PeiXi Su  TingTing Xie  ZiJuan Zhou 《寒旱区科学》2011,3(5):0381-0391

Water use efficiency of C₄ plants is higher than that of C₃ plants, and CAM (Crassulaceae Acid Metabolism) plants have the highest water use efficiency. In the desert regions of China, CAM plants are scarce, and C₄ plants, especially C₄ woody plants, have an important position and role in the desert ecosystem. There are 45 species of C₄ woody plants in the desert regions of China, including semi-woody plants, accounting for 6% of the total desert plant species in China, and most of them are concentrated in the families of Chenopodiaceae and Polygonaceae, which are 19 species and 26 species, respectively. The number of C₄ herbaceous plants is 107 species, including 48 monocot species and 59 dicot species. C₄ woody plants mainly inhabit the northwestern arid desert regions of China west of the Helan Mountains. The drought-resistance and drought-tolerance of C₄ herbaceous plants are worse than C₄ woody plants, and C₄ herbaceous plants mainly inhabit areas with shallow groundwater depth and better water conditions in the desert regions, and are widely distributed along the margins of oases. The abundance of C₄ woody plants is closely correlated with drought, but the abundance of C₄ herbaceous plants increases with wet conditions.  相似文献   

棉花群体光合生产动态模拟   总被引：3，自引：1，他引：3  

董尚力  申双和  李秉柏  徐立华  张京红 《南京气象学院学报》2001,24(2):194-198

以棉花的生物学特性为基础，充分考虑棉花棉型特征，将棉株分成三层（层距为1．5个叶面积指数），逐层进行光合作用模拟，并加以综合，得出棉花群体光合产量，资料验证结果表明，在水肥等条件下适宜的情况下，本模型能较好地反映棉花光合生产特性，模拟预测棉花总生物量精度较高，可用于辅助指导大田生产管理。  相似文献   

Role of pigments on algal communities and photosynthesis   总被引：2，自引：0，他引：2  

A. Lami  P. Guilizzoni  D. Ruggiu  B. Polli  M. Simona  A. Barbieri 《Aquatic Sciences - Research Across Boundaries》1992,54(3-4):321-330

A one-year study of phytoplankton, primary production and related physical and chemical factors was made in a Swiss basin of Lake Lugano (Lago di Lugano). The chlorophylls and 12 carotenoids were analyzed with a TLC technique. The carotenoid monitoring was considered to be particularly interesting, because the role of these pigments in freshwater algae is still very poorly documented by field studies. The dependence of photosynthesis on several factors was statistically evaluated. Evidence was found of light-adaptation phenomena. The variations of photosynthetic activity and efficiency largely depended on the light regime in the few days before the field observations and on the cellular content of chlorophylls and single carotenoids, whose concentrations in their turn were closely linked with light, temperature, average cell size, and with the actual species assemblage.  相似文献   

Linking satellite-based spring phenology to temperate deciduous broadleaf forest photosynthesis activity     

《International Journal of Digital Earth》2013,6(11):881-896

Satellite-based remote sensed phenology has been widely used to assess global climate change. However, it is constrained by uncertain linkages with photosynthesis activity. Two dynamic threshold methods were employed to retrieve spring phenology metrics from four Moderate Resolution Imaging Spectroradiometer (MODIS) products, including fraction of Absorbed Photosynthetically Active Radiation (fAPAR), Leaf Area Index (LAI), Normalized Difference Vegetation Index (NDVI), and Enhanced Vegetation Index (EVI) for three temperate deciduous broadleaf forests in North America between 2001 and 2009. These MODIS-based spring phenology metrics were subsequently linked to the photosynthetic curves (daily gross primary productivity, GPP) measured by an eddy covariance flux tower. The 20% dynamic threshold spring onset metrics from MODIS products were closer to the photosynthesis onset metrics at the date of 2% GPP increase for NDVI and fAPAR, and closer to the date of 5% and 10% increase of GPP for EVI and LAI, respectively. The 50% dynamic threshold onset metrics were closer to the photosynthesis onset metrics at the date of 10% GPP increase for NDVI, and closer to the date of 20% GPP increase for fAPAR, LAI and EVI, respectively. These results can improve our knowledge on the photosynthesis activity status of remotely sensed spring phenology metrics.  相似文献   

Optimization of medium and cultivation conditions for enhanced exopolysaccharide yield by marine Cyanothece sp. 113     

苏传东  池振明  卢伟东 《中国海洋湖沼学报》2007,25(4):411-417

Cyanothece sp. 113 is a unicellular, aerobic, diazotrophic and photosynthetic marine cyanobacterium. The optimal medium for exopolysaccharide yield by the strain was 70.0 g/L of NaCl, and 0.9 g/L of MgSO4 based on the modified F/2 medium for cultivation of marine algae. The optimal cultivation condition for exopolysaccharide yield by this cyanobacterial strain was 29°C, aeration, and continuous illumination at 86.0 μE/M2/S. Under the optimal conditions, over 18.4 g/L of exopolysaccharide was produced within 12 days. This was so far the highest exopolysaccharide yield produced with strains of Cyanothece sp. obtained.  相似文献   

海水盐度变化影响裂片石莼(Ulva fasciata)(Ulvales, Chlorophyta)幼体的生长和光合作用     

陈斌斌  邹定辉 《海洋学报(英文版)》2015,34(8):108-113

Seawater salinity is greatly influenced by tide, evaporation and rain falls. In this study, we investigated the growth and photosynthetic responses of zygote-derivedUlva fasciata Delile germlings to sh...  相似文献   

The effects of elevated-CO₂ on physiological performance of Bryopsis plumosa     

YILDIZ Gamze  DERE &#;&#;kran 《海洋学报(英文版)》2015,34(4):125-129

An increase in the level of atmospheric carbon dioxide (CO2) and the resultant rise in CO2 in seawater alter the inorganic carbon concentrations of seawater. This change, known as ocean acidification, ...  相似文献   

中国东部暖温带高山林线乔木的光合作用及其与环境因子的关系   总被引：9，自引：2，他引：9  

刘鸿雁  谷洪涛  唐志尧  戴君虎  崔海亭 《山地学报》2002,20(1):32-36

高山林线对于气候变化的影响非常敏感。气候变化首先从个体的水平影响林线的内部结构，然后才影响到作为整体的林线的推移，因此研究乔木个体生理活动与气候条件之间的关系，对于研究高山林线对气候变化的响应具有重要意义。本文通过对们于中国东部暖温带的五台山、关帝山、太白山森林上限附近白杆（Picea meyeri）、华北落叶松（Larix principis-ruprechtii)和太白红杉（L.chinensis)生理活动与环境因子的野外测定，分析了光合作用与环境因子之间的关系，得出以下初步结论：（1）研究区内林线乔木的光合作用不存在单一的限制因子；（2）有关研究表明，光照与温度共同作用于高山林线乔木的光合作用，在光照较低的情况下，温度成为光合作用的限制因子，本研究进一步证实了这一现象；（3）树线、林缘、郁闭林内三种不同生境条件下乔木光合作用的对比表明，林缘的生境条件最适合植物光合作用。虽然林缘的湿度条件中等，但良好的光照和温度条件对光合作用有促进作用。  相似文献   

水稻植株光合产物分配、转移规律和生长动态模拟          下载免费PDF全文

冯定原  邱新法  戴小笠 《大气科学学报》1996,19(1):50-56

在总结前人研究的基础上,结合1989～1992年田间试验资料,采用优化算法,计算了水稻植株光合产物分配系数α_i和转移系数β_i 的量值,分析了两者随水稻生长发育的变化规律以及天气气候因子对它们的影响,建立了水稻植株和各个器官的生长动态模型,并进行了检验。  相似文献   

Variations in atmospheric CO2 at the Meteorological Research Institute, Tsukuba, Japan     

Hisayuki Yoshikawa Inoue  Hidekadzu Matsueda 《Journal of Atmospheric Chemistry》1996,23(2):137-161

Since April 1986, measurements of the CO₂ concentration in the surface air have been conducted at the Meteorological Research Institure (MRI, 36°04 N, 140°07 E, 25 m above sea level) in Tsukuba, located 50 km northeast of Tokyo, Japan. The CO₂ data measured over times between 11:00 Japan Standard Time (JST) and 16:00 JST (C _N ) were considered to be representative of the air (within a few ppmv) in the planetary boundary layer. To evaluate the representative CO₂ level on a spatial scale larger than that of the C _N record, the CO₂ data with hour-to-hour variation less than 1 ppmv were selected (C _P ). Comparison of these data with those of Ryori (39°02 N, 141°50 E), a continental station operated by the Japan Meteorological Agency, indicates that the C _P record provides a representative CO₂ level in the air on spatial scales of at least a few hundred kilometers.The C _N record allows an investigation of the internanual changes in photosynthesis/respiration against changes in climatological parameters. Within a small temperature anomaly (ca.±1 °C) respiration is sensitive to the temperature change, while photosynthesis is less sensitive. When the temperature anomaly is large, however, photosynthesis and respiration tend to be competitive.  相似文献