【摘 要】
：
According to differences in vegetation types and their coverage, combining the latestresearch, using theory and method on the value of vegetation ecosystem serv
【机 构】
：
College of Tourism and Environment, Shaanxi Normal University, Xi’an 710062, China;
论文部分内容阅读
According to differences in vegetation types and their coverage, combining the latestresearch, using theory and method on the value of vegetation ecosystem services, this paper not onlycalculated goods produced by different types of vegetation but also estimated the value of variousvegetation ecosystem services and set up database, GIS and eco-account of vegetation ecosystem. Theresult was as follows: the value of vegetations primary productivity, soil and fertility conservation,water conservation, CO2 fixation and O2 release was 199.6 billion yuan/a, 22.64 billion yuan/a, 22.66billion yuan/a, 352.24 billion yuan/a and 374.19 billion yuan/a, respectively. The total value ofecosystem services was 968.33 billion yuan/a. The temperate deciduous broad-leaved forest had thehighest contribution rate, accounting for 16.42%. The result of value can reflect regional reality moreexactly.
其他文献
由于干细胞在白血病、老年性痴呆症、糖尿病等多种疾病的治疗以及动物克隆等方面显示出巨大的应用前景,干细胞研究已经成为当今生命科学领域的热点。干细胞能够用于某些疾病
近几年来,随着我国对外贸易的发展以及对外交流的深入,企业社会责任运动逐渐被导入中国,特别是社会责任国际标准(Social Acountibility 8000,简称SA8000)和各大跨国公司所制
价格不仅是饭店问竞争的一个营销武器,也是顾客感知饭店整体价格水平的重要线索之一,顾客会根据价格形成饭店的整体价格形象,进而会影响他们的惠顾意愿和购买行为,因此研究消
本研究明确了kdr突变和解毒代谢在B型烟粉虱Bemisia tabaci对高效氯氰菊酯抗性中的作用。B型烟粉虱NJ品系相对于烟粉虱敏感品系(SUD-S,非B型)对高效氯氰菊酯有266倍的抗性。
根据GenBank发表的犬瘟热病毒(CDV)核酸序列[CDV5804(AY386315)、CDV01-2689(AY649446)、CDV A75-17(AF164967)、CDV 00-2601(AY443350)、CDV 98-2645(AY445077)、CDV 98-265
植物提取物的微生物检测是保证植物产品安全性的重要手段,制定严格的植物提取物质量控制标准体系,特别是功能性食品、食品添加剂和植物源日用化学品等产品中微生物的检测和控
目的:观察不同浓度葡萄糖对小鼠前脂肪细胞(3T3-L1细胞)分化及insig-1和insig-2 mRNA基因表达的影响,探讨insig基因在脂肪细胞分化与代谢中的作用。方法:将3T3-L1细胞分别在
利用紫外激光交联和免疫沉淀技术(UV laser crosslinking and immunoprecipitation, UV-X-IP)分析原核表达的酿酒酵母热激因子(heat shock factors,HSFs)和片段化的基因组靶D
As an ecosystem in geological history, palaeocommunity has the essence of thermodynamics. This paper introduces the concept of entropy into the study of the evo
建立一种新的基于链霉素沉淀的PrPSc的Western blot检测方法,用终浓度为60mmol/L的链霉素处理蛋白酶K消化的PrPSc贮存液,通过离心沉淀PrPSc,用Western blot对PrPSc的链霉素富