Transpiration rates of Carex Meyeriana in relation to micrometerological factors in a mountain valley wetland     

Huifeng Xu  Yanming Jin  Wei Deng  Kezhang Xu  Zhen Wang 《山地科学学报》2009,6(3):293-298

In order to reveal transpiration rates of wetland plants and its relationships to micro- meterological factors in a mountain valley wetland, relative humidity, air temperature, leaf temperature, soil temperature, photo flux density and transpiration rates were measured once two hours in a Carex meyeriana wetland of the Changbai Mountain valley in dry （July） and wet （September） of 2003, respectively. Results showed that the tendency of ＂decreasing after increasing＂ was obvious in wet season. However, a relatively stable trend was observed for the transpiration in dry season.. Generally, the photon flux density of Carex meyeriana was higher in wet season than that in dry season. However, the variabilities of leaf temperature, air temperature and relative humidity were similar in both seasons. Higher transpiration rates of Carex meyeriana leaves were observed in July （varied from 40 to 150 mol.m^-2.s^-1） compared to those （varied from 7 to 14 mol.m^-2.s^-1） in September. Transpiration rates were significantly correlated with air temperature （P〈0.01）, leaf temperature （P〈0.01）, and wind speed （P〈0.05）, but correlationship between relative humidity and photo flux density was not significant （P〈0.05）.  相似文献   

山东沂蒙山国家地质公园遗迹资源特点及保护   总被引：1，自引：0，他引：1  

郭士昌  姚春梅  林存来  刘昌青 《山东国土资源》2009,25(8):57-62

沂蒙山地质公园以蒙山为主体,由9大园区组成,是一个多种地质遗迹资源并存、综合性的大型地质公园。园区内既有代表性的地质构造剖面、独特的地质地貌景观,又有恐龙足迹化石、地质灾害遗迹,同时还是金刚石的典型产地。该文在对区内主要地质遗迹资源分析评价的基础上,提出了地质遗迹保护内容及保护措施,对该区地质遗迹合理保护开发起到一定指导作用。  相似文献   

震后基于无人机快速三维定位被困人员模型研究     

杜浩国  孙志  杜浩标  张方浩  汤筱麒  卢永坤  曹彦波  邓树荣  吕佳丽  和仕芳 《震灾防御技术》2021,16(2):404-413

针对震后被倒塌建筑物或滑坡埋压的被困人员进行快速定位问题,在阅读大量相关文献的基础上,以无人机遥感、地理信息空间和三维质心定位技术为基础,采用无线信号RSSI测距模型,配合影像范围内基准影像数据辅助定位,构建震后基于无人机快速三维定位被困人员模型.以红河县城区作为研究区,对城区内特定人员进行三维定位,结果表明该模型定位...  相似文献   

Sediment burial stimulates the growth and propagule production of Spartina alterniflora Loisel.     

Zifa Deng  Shuqing An  Congjiao Zhao  Lin Chen  Changfang Zhou  Yingbiao Zhi  Hongli Li 《Estuarine, Coastal and Shelf Science》2008,76(4):818-826

Spartina alterniflora Loisel., an extensively invasive species on the Chinese coast, is a focus of increasing management concern due to its high expansion rate in estuaries and tidal zone, and the significant damage it causes to native ecosystems. In order to understand the processes and mechanisms of invasion of S. alterniflora in China, the impact of three sediment types (sand, sand–loam mixture and loam) and five buried patterns (unburied, 50% burial of initial plant height, 75% burial of initial plant height, complete burial and repeated burial) on the growth of seedlings or ramets was investigated. Results showed that each of the three factors (sediment types, burial pattern and plant materials) and interactions between/among them, significantly affected height and clonal growth, and biomass accumulation and allocation. Plant height, total biomass and number of new vegetative propagules significantly increased with progressive burial treatments. However, the complete burial treatment resulted in the death of all plant materials, and the maximum values of three parameters were found in the 50% burial or repeated burial treatments. Plant responses were determined by the instantaneous thickness of sediment of each time burial rather than by the total quantity of repeated burial. The growth of S. alterniflora was not shown to be dependent on specific types of sediment in sedimentation environment. In contrast to the unburied control, the proportion of primary tillers produced directly from initial individuals and the ratio between the aboveground and belowground biomass were greater under burial treatments. Seedlings produced more new vegetative propagules than vegetative offspring in all experimental treatments, and the former were apt to produce ramets from rhizomes rather than primary tillers. It is concluded that under various sedimentation environments, the clonal spread efficiency of seedlings was higher than that of vegetative offspring, and there is a positive feedback relationship between sedimentation and the growth of S. alterniflora. Thus, moderate sedimentation may stimulate the invasion of exotic species, S. alterniflora in coastal China.  相似文献   

Preparation by enzymolysis and bioactivity of iron complex of fish protein hydrolysate （Fe-FPH）from low value fish   总被引：6，自引：0，他引：6  

邓尚贵  霍健聪  谢超 《中国海洋湖沼学报》2008,26(3):300-306

Preparation of Fe^2＋ chelate of fish protein hydrolysate （Fe-FPH） obtained from low value fish proteins was introduced and its bioactivity was studied by compound enzymolysis. The optimum conditions for hydrolysate chelating Fe^2＋ are DH （degree of hydrolysis） at 5%, pH 7.0, 20℃ and 15 min chelating time for FM （material not being defatted）. Four types of Fe-FPH including CA （deposit after chelating）, CB （deposit in 50% of absolute ethanol solution）, CC （suspended deposit in 80% of absolute ethanol solution）, and CD （bottom deposit in 80% of absolute ethanol solution） were fractionated with absolute ethanol from FM. Structural analysis through infra-red spectrum revealed that Fe^2＋ was combined strongly with amino-group and carboxyl-group in each chelate and each Fe^2＋ could form two five-member ring structures. All of the four chelates were shown more significant antioxidative activity and can be used as natural hydrophobic and hydrophilic antioxidant. Among all the chelates, the CB possesses the most effective antioxidative activity at 92% as high as that of a-tocopherol. Among all Fe-FPHs, only CD showed the most effective antibacterial activity against Escherichia coli, Staphylococcus aureus, Salmonella typhi, and Bacillus subtilis and can be used as natural antibacterial. It provides a more effective way for utilization of low value fish proteins and key information of Fe-FPH as additive in food industry.  相似文献   

Chemical characteristics of water environment in limnic wetlands in the western Songnen Plain, China   总被引：1，自引：1，他引：0  

SONG Xin-shan  YAN Bai-xing  DENG Wei  ZHAI Jin-liang 《中国地理科学(英文版)》2000,10(4):377-382

Duetoregionalhydrogeologicandclimaticconditions,inthewesternSongnenPlain,themostdistinctcharacteristicofwaterenvironmentinlimnicwetlandsisthatmanywaterbodieshavehighsaltcontentsandpHvalues,andsomelimnicwetlandsbelongtosaltmarshes.Thelimnicwetlandsofthisregionarespecialnaturecomplex.Itisimportantfortheutilizationofwetlandresourcesandtheintegrateddevelopmentofsaline-alkalinesoiltostudychemicalcharacteristicsofwaterenvironmentinthisregion.1NATURALENVIRONMENTCHARACTERISTICSOFTHEWE…  相似文献   

福建沿岸地区红树林的种类与分布   总被引：11，自引：0，他引：11  

王文卿  赵萌莉  邓传远  林鹏 《台湾海峡》2000,19(4):534-540

于1998年11月至1999年1月对福建沿岸地区的红树林进行了调查,就福建红树林的种类组成、面积、分布情况、人工造林情况进行了论述,并就制约福建发展红树林的因素及解决方法提出了一些建议。  相似文献   

三维潮流和潮流输沙问题的一种混合数值模拟及其应用   总被引：5，自引：0，他引：5  

董文军  李世森  白玉川 《海洋学报》1999,21(2):108-114

应用一种平面迎风有限元与垂向隐式有限差分相结合的数值计算方法建立了三维潮流和潮流输沙数学模型,并分别与相应的理论公式进行了对比验证.将建立的模型对广西廉州湾水域进行了计算,与实测资料的对比分析表明模型的计算结果符合实际.  相似文献   

中国含盐盆地卤水溴元素分布与物源     

宋华玲  樊启顺  李庆宽  刘万平  韩光  韩春梅 《地质学报》2024,98(4):1198-1210

中国含盐盆地赋存丰富的盐湖卤水和深部卤水资源,卤水中富集溴(Br)元素,具有潜在的开发利用价值。Br作为盐湖卤水中重要的资源元素,目前对其分布规律和物质来源的系统对比研究鲜有报道。本文以柴达木盆地察尔汗盐湖四个区段晶间卤水为研究对象,分析整个湖区Br元素分布规律和物质来源,对比中国不同含盐盆地卤水Br资源变化和物源联系,并总结不同卤水开发利用价值。结果表明：① 察尔汗盐湖Br含量呈东高西低特征且不同区段差异明显;② 别勒滩和达布逊区段卤水低Br受河流补给并经蒸发富集,而察尔汗和霍布逊区段高Br受北部断裂带上涌富Ca泉水补给;③ 中国含盐盆地(柴达木盆地、库车盆地、江汉盆地、吉泰盆地)大部分深部卤水高Br值主要受水- 岩反应、沉积物及有机质中Br的解吸获得;④ 盐湖晶间卤水虽远不及深部卤水Br含量高,但其优点在于便于开发、综合利用率高,尤其浓缩卤水及老卤中的Br含量可预见性的高于工业开采品位,是当下和今后值得关注的资源。  相似文献   

Field-Dependent Adaptive Optics Correction Derived with the Spectral Ratio Technique     

C. Denker  N. Deng  T. R. Rimmele  A. Tritschler  A. Verdoni 《Solar physics》2007,241(2):411-426

In this empirical study, we compare high-resolution observations obtained with the 65-cm vacuum reflector at Big Bear Solar Observatory (BBSO) in 2005 and with the Dunn Solar Telescope (DST) at the National Solar Observatory/Sacramento Peak (NSO/SP) in 2006. We measure the correction of the high-order adaptive optics (AO) systems across the field of view (FOV) using the spectral ratio technique, which is commonly employed in speckle masking imaging, and differential image motion measurements. The AO correction is typically much larger (10^′′ to 25^′′) than the isoplanatic angle and can be described by a radially symmetric function with a central core and extended wings. The full-width at half-maximum (FWHM) of the core represents a measure of the AO correction. The average FWHM values for BBSO and NSO/SP are 23.5^′′ and 18.2^′′, respectively. The extended wings of the function show that the AO systems still contribute to an improved speckle reconstruction at the periphery of the 80^′′×80^′′ FOV. The major differences in the level of AO correction between BBSO and NSO/SP can be explained by different contributions of ground-layer- and free-atmosphere-dominated seeing, as well as different FOVs of the wavefront sensors. In addition, we find an anisotropic spectral ratio in sunspot penumbrae caused by the quasi-one-dimensional nature of penumbral filaments, which introduces a significant error in the estimation of the Fourier amplitudes during the image restoration process.  相似文献