共查询到20条相似文献，搜索用时 258 毫秒
1.
WANGXu-mei WANGHong-yan ZHANGYing 《东北农业大学学报(英文版)》2004,11(1):90-92
This study compared the paddy field ecosystem on developped from basalt area in Jingpo Lake with primary ecosystem by analyzing some indexes such as sunlight, temperature, moisture, biodiversity and energy. The result indicate that the paddy field ecosystem is feasible in improving the environment, energy utility, biodiversity and economy. And also it is a sustainable system, providing theoretical basis and practical reference for the rebuilt of similar system. 相似文献
2.
YUAN Zhaohua JIANG Ming SONG Ge ZHOU Jia 《东北农业大学学报(英文版)》2007,14(3):229-234
Cumulative effects on wetland soils under different cultivation patterns were analyzed in the experimental fields of the Ecological Experimental Station of Mire-wetlands in Sanjiang Plain.The results suggested that the paddy field combined with the glebe to act on the soil environment.Under the combination of natural and anthropological factors,the cultivation of the paddy field and the glebe obviously related with different kinds of fertility factors of soil.The remarkable relation among organic matter,total nitrogen and available nitrogen reflected the fertilization of the soil at some extent. 相似文献
3.
ZHANG Yichuan LI Dongsheng WANG Shanshan School of L scape Architecture Henan Institute of Science Technology Xinxiang Henan China Forestry College Henan University of Science Technology Luoyang China 《东北农业大学学报(英文版)》2008,15(4):63-69
There has been a rapid development in the construction of wetland parks in China in recent years.This paper discussed the progress in the research of Chinese wetland parks that covered the aspects of wetland resources,landscape and environment.The function of wetland parks,the evaluation of landscape and the exploiting of resources;the landscape concept and landscape planning and design;the plant environment,the water environment and the recreation environment were all reviewed.The research of Chinese wetland parks started later but developed rapidly,having remarkable achievements in practice and functional studies,and there are still some shortcomings in the researches to be improved.At last,the key points which should be researched urgently in the future were discussed. 相似文献
4.
The Borana rangelands are important areas of cattle production in Ethiopia. However, these rangelands are threatened by the increasing changes in the natural vegetation from grass and forbs dominated into unpalatable bushy woody vegetation resulting in the loss of some of the highly desirable grass species. This study was conducted to assess the impacts of bush encroachment on the biodiversity, structure and cover of the native vegetation in bush encroached and non-encroached sites. Vegetation data were collected from both sites by laying quadrate plots along transects using a systematic sampling method. According to the results, higher number of species was recorded in the non-encroached sites than that in the encroached sites. The diversity indices for the non-encroached and the encroached sites were 3.16 and 2.67, respectively. The abundance and cover analysis indicated that there was high density and cover of herbaceous species in the non-encroached site. There was a significantly higher density of woody species cover in the encroached site. Generally, the bush encroachment in the Borana rangelands has hampered the diversity of the native vegetation, particularly the grasses and forbs and reduced the ground cover, exposing large parts of the rangelands for soil erosion and other degradation process. 相似文献
5.
巢湖、瓦埠湖沉积物中氮赋存形态研究(英文) 总被引：7，自引：0，他引：7
Composition and distribution of nitrogen in Chaohu Lake and Wabu Lake sediments were studied.The results showed that the mean total nitrogen content in Chaohu Lake and Wabu Lake was 0.533 g/kg and 0.265 g/kg respectively,and the primary composition of nitrogen was organic nitrogen(94%).The organic index indicated that the organic pollution degree of Wabu Lake was lower than that of Chaohu Lake. 相似文献
6.
Comparative Analysis of Genetic Diversity in Landraces of Waxy Maize from Yunnan and Guizhou Using SSR Markers 总被引：8，自引：1，他引：8
LIU Yong-jian HUANG Yu-bi RONG Ting-zhao TIAN Meng-liang YANG Jun-pin 《中国农业科学(英文版)》2005,4(9):648-653
Waxy maize landraces are abundant inYunnan and Guizhou of China. Genetic diversity of waxy maize landraces from Yunnan and Guizhou were analyzed using SSR markers. We screened 38 landraces with 50 primers that generated 3 to 6 polymorphic bands, with an average of 4.13 bands. Shannon＇s information indices for genetic diversity of the 14 waxy maize landraces from Yunnan varied from 4.9571 to 42.1138 and averaged 26.5252; Shannon＇s information indices for genetic diversity of the 24 waxy maize landraces from Guizhou varied from 22.0066 to 40.6320 and averaged 32.3156. For the 14 waxy maize landraces from Yunnan, the within-landrace genetic diversity accounted for 45.40% and the among-landrace genetic diversity accounted for 54.60% of the total genetic diversity observed. For the 24 waxy maize landraces from Guizhou, the within-landrace genetic diversity accounted for 50.76% and the among-landrace genetic diversity accounted for 49.24% of the total observed. Some individual landraces possessed as much as 96.86% of the total genetic diversity occurring among landraces within origins. Differentiation between geographic origins accounted for only 3.14% of the total genetic diversity. Both Yunnan and Guizhou would be the diversity centers and the original centers of waxy maize. 相似文献
7.
《（《农业科学与技术》）编辑部》2008,(4)
Composition and distribution of nitrogen in Chaohu Lake and Wabu Lake sediments were studied.The results showed that the mean total nitrogen content in Chaohu Lake and Wabu Lake was 0.533 g/kg and 0.265 g/kg respectively,and the primary composition of nitrogen was organic nitrogen(94%).The organic index indicated that the organic pollution degree of Wabu Lake was lower than that of Chaohu Lake. 相似文献
8.
LIU Jing-jing YE Lin-lin PAN Cheng-rong WANG Jia-quan .Guilin Research Institute of Geology for Mineral Resources Guilin .Nanjing Institute of Geography Limnology Chinese Academy of Sciences Nanjing .Anhui Institute of Environmental Science Hefei .School of Resources Science Environment Engineering Hefei University of Technology Hefei 《（《农业科学与技术》）编辑部》2008,(4)
Composition and distribution of nitrogen in Chaohu Lake and Wabu Lake sediments were studied.The results showed that the mean total nitrogen content in Chaohu Lake and Wabu Lake was 0.533 g/kg and 0.265 g/kg respectively,and the primary composition of nitrogen was organic nitrogen(94%).The organic index indicated that the organic pollution degree of Wabu Lake was lower than that of Chaohu Lake. 相似文献
9.
ZHAO Yong-guo Ofori Atta LU Chang-ming 《中国农业科学(英文版)》2009,8(8):931-938
The Brassica oilseed crops went through two major breeding bottlenecks during the introgression of genes for zero erucic acid and low glucosinolate content, respectively, which may lead to reduced genetic biodiversity of the crop. This study investigates the impact of these bottlenecks on the genetic diversity within and across European and Chinese winter B. rapa cultivars. We compared eight cultivars from Europe and China, representing three different seed qualities from three different breeding periods： （1） high erucic acid, high glucosinolates （＋＋）; （2） zero erucic acid, high glucosinolates（0＋）; （3） zero erucic acid, low glucosonolates （00, canola quality）. Diversity was estimated on 32 plants per cultivar, with 16 simple sequence repeat （SSR） markers covering each of the B. rapa linkage groups. The analysis of molecular variance （AMOVA） showed that genetic variations within cultivars, across cultivars and across regions （Europe and China） were significant, with about 60% of the total variation within cultivars. There was a slight, but non-significant loss in genetic diversity within cultivars when comparing the three breeding periods as indicated by effective number of alleles （2.39, 2.23, and 1.99 for breeding periods 1, 2, and 3, respectively）, Shannon information index （0.93, 0.90, 0.75）, and expected heterozygosity （0.51, 0.49, 0.42）. By cluster analysis （UPGMA dendrogram） and principal coordinate analysis, Chinese and European cultivars were clearly divided into two distinct groups. In conclusion, quality improvement did not significantly reduce the genetic diversity of European and Chinese B. rapa cultivars. 相似文献
10.
《农业科学与技术》2016,(3)
Wetland park is an important mode of wetland protection, meanwhile, construction of comprehensive index system has become the hotspot and keystone of the researches on Wetland Parks. Basing on different development stages , this paper firstly divided the Wetland Parks into three categories, including the start-up stage, the development stage and the refinement stage. And then screened and identified the direction and keypoints of comprehensive evaluation for wetland parks in different development stages using expert scoring, questionnaire and analytic hierarchy process (AHP). 相似文献
11.
沉湖湿地生物多样性研究 总被引：6，自引：1，他引：5
1研究区概况湖北沉湖湿地自然保护区地处长江中游,江汉平原东缘、长江和汉水交汇的三角地带,地理坐标为113°46’09”-113°53’53”E-30015,10”-30°25’53”N。其总面积21916hm^2,由王家涉湖、沉湖、张家大湖和黄丝河及其周边地区组成,其中湖泊湿地面积9457．8hm^2。林地面积1284．4hm^2,耕地面积9614hm^2,其他用地面积1559．8hm^2。最低海拔17．5m,最高海拔21m,相对高差3．5m^2保护区位于温暖的北亚热带中纬度南缘, 相似文献
12.
对沉湖湿地的生物多样性进行调查和研究,从湿地植物多样性、动物多样性和生态系统多样性3个方面对该区域生物多样性进行了概括。在此基础上,对沉湖湿地生物多样性进行了评价,得出：沉湖湿地生物多样性的合理利用和保护,对改善区域环境、维持武汉地区乃至长江中下游地区的可持续发展将起到非常重要的作用。 相似文献
13.
以大莲湖为研究区域进行生态修复工程实践,在分析了大莲湖环境问题的基础上,将大莲湖工程区划分为湿地恢复与重建区、森林湿地培育区以及浅滩湿地恢复与多样性保育区,并提出相应的修复措施。通过森林湿地、浅滩湿地等多种湿地的恢复及重建,提高湿地的经济产出以及生态修复工程的可操作性和可持续性,探索湖泊生态修复及区域经济的协调发展之路,以期为淀山湖湿地修复工程乃至太湖流域水环境综合治理提供借鉴。 相似文献
14.
黑龙江省湿地旅游资源与开发对策 总被引：8，自引：1，他引：7
为了使湿地以其独特的自然和文化景观为湿地旅游提供有利条件,通过对黑龙江省湿地资源和湿地旅游资源的调查,阐述了湿地和湿地旅游资源的概况及其分布;分析了黑龙江省湿地旅游资源文化的多样性、景观多样性和生物多样性等特点;总结了湿地旅游资源开发上存在的问题,并在此基础上提出了开发的对策。 相似文献
15.
16.
通过腾冲北海湿地保护区动植物资源多样性及其环境状况的调查与研究,参照拉姆沙尔全球重要湿学（Ramsar Sites）选择的评价指标,得出结果认为,北海湿地景观的特殊性、类型的复杂性和极为丰富的生物多样性程度为全球之罕见,其稀有性或唯一性具有维护全球生物多样性的重要价值。针对现阶段北海湿地资源与环境所面临的威胁,提出了北海湿地有效保护与管理的合理措施与对策。 相似文献
17.
为研究蠡湖渔业资源的种群组成结构特点,了解蠡湖渔业资源多样性的时空变化规律,于2007年5月至2008年4月在蠡湖设置了10个采样点,调查和分析了蠡湖渔业资源种类和优势种以及群落多样性。结果表明:调查期间,青梢红鲌(Erythroculter dabryiBleeker)和湖鲚(Coilia ectenes taihuensis)是各个监测站点的优势品种;各个站点Shannon-Wiener多样性指数(H′)介于1.26~2.89之间,依此判定蠡湖渔业资源群落的多样性和丰富度属于正常水平。渔父岛和鹿丁山以及渔父岛和水上明月站点间H′和Wilhm改进指数(H″)差异显著(P0.05),其余站点间H′差异均不显著(P0.05);10个站点间J差异均不显著(P0.05)。运用GIS软件分析,西蠡湖的生物多样性指数和均匀度指数明显高于东蠡湖(以宝界桥为界)。 相似文献
18.
为陕西黄河湿地的生物多样性保护及管理工作提供参考资料,对陕西黄河湿地夏季鸟类群落结构与多样性进行了分析。结果表明:陕西黄河湿地共有鸟类61种,隶属于15目33科。湿地鸟类群落的多样性指数最高,总干渠次之,农田-居民区生境第三,黄土崖最低。在各群落类型中,湿地和总干渠鸟类群落间的相似性程度最高。 相似文献
19.