长门岩岛植物群落中的山茶现状和恢复措施     

周汝伦  杨震  魏建功  董树刚 《中国海洋大学学报(自然科学版)》1994,(1)

报告青岛市长门岩岛植物群落中的山茶现状。指出在我国分布最北边缘的常绿阔叶植物天然山茶，因人为破坏已濒临绝境。建议成立山茶自然保护区，并提出恢复山茶植物群落的措施。  相似文献   

Future impacts of drivers of change on wetland ecosystem services in Colombia     

《Global Environmental Change》2017

Wetlands are among the most valuable ecosystems in the world due to their delivery of ecosystem services (ES), but they are particularly vulnerable to drivers of land-use change. However, little is known about how different wetlands respond to drivers of land-use change and how that impacts their delivery of ES. After extreme floods hit Colombia in 2010–2011, negative impacts from these storms heightened the interest of Colombian policy-makers in understanding and recognizing the importance of wetlands. Here, we present a map with 19 wetland types for Colombia and assess the ES that these wetlands deliver and how those ES are impacted by drivers of land-use change. We based our spatial analysis on the Corine Land Cover data for Colombia and combined that with spatial indices derived from knowledgeable experts using the matrix approach and participatory mapping (PGIS). The most vulnerable wetland types identified were floodplain forests, riparian wetlands, freshwater lakes and rivers. The region of Magdalena-Cauca has been identified as the most vulnerable to the impacts of land-use change, until 2025. We discuss our results in light of the current Colombian policy-debate which concerns the designation of wetlands as strategic ecosystems. This designation implies necessary restrictions or prohibition of harmful activities in wetlands, principally mining and industrial agriculture.  相似文献   

Detection of leaf structures in close-range hyperspectral images using morphological fusion     

Gladys Villegas  Wenzhi Liao  Ronald Criollo  Wilfried Philips  Daniel Ochoa 《地球空间信息科学学报》2017,20(4):325-332

Abstract

Close-range hyperspectral images are a promising source of information in plant biology, in particular, for in vivo study of physiological changes. In this study, we investigate how data fusion can improve the detection of leaf elements by combining pixel reflectance and morphological information. The detection of image regions associated to the leaf structures is the first step toward quantitative analysis on the physical effects that genetic manipulation, disease infections, and environmental conditions have in plants. We tested our fusion approach on Musa acuminata (banana) leaf images and compared its discriminant capability to similar techniques used in remote sensing. Experimental results demonstrate the efficiency of our fusion approach, with significant improvements over some conventional methods.  相似文献   

基于协同理论的旅游综合体演化过程与机制研究——以杭州西溪国家湿地公园为例   总被引：2，自引：1，他引：1  

陆林  陈振  黄剑锋  凌善金  朱其静  穆成林  许艳 《地理科学》2017,37(4):481-491

选取杭州西溪国家湿地公园作为案例地,引用协同理论为指导,探讨了旅游综合体的演化过程与机制,认为西溪国家湿地公园是由多要素组成的协同系统,经历了旅游产业要素“集聚-共生-融合”的演化过程,萌芽、成长和完善3个阶段集聚的分别是传统旅游业态要素、新兴旅游业态要素和创新旅游业态要素。演化本质是协同系统序参量的变化,不同演化阶段序参量各异,萌芽阶段体现为要素集聚,受外部经济效益驱动;成长阶段体现为要素共生,受内部要素结构调整驱动;完善阶段体现为要素融合,受创新驱动。演化动力是要素间的非线性作用,通过系统内部与外部的能量交换及子系统间相互作用所形成的反馈机制来实现。选取房价作为指标,采用均质与非均质空间比较法测定了西溪国家湿地公园的空间溢出效应。旅游业与相关产业协同创新是西溪国家湿地公园发展模式的主要特征,具体表现为以优良的资源禀赋和广阔的市场为基础,以旅游业为核心,吸引相关产业要素集聚,形成共生和融合效应,发展过程中注重外部物质能量交换和内部自组织调控。  相似文献   

苏州湿地公园自然教育发展实践和探索   总被引：3，自引：3，他引：0  

范竟成  朱铮宇  张铭连 《湿地科学与管理》2017,(1):14-17

2012年苏州启动了湿地自然学校项目,旨在推进湿地科普宣教工作。以苏州市10家湿地自然学校筹建实践为例,提出了湿地自然学校的相关定义、硬件解说系统和软件解说系统的设计内容,为我国湿地公园的科普宣教发展提供参考。  相似文献   

地基土-桩基础-核电站辅助厂房结构相互作用体系的地震响应分析   总被引：1，自引：0，他引：1  

应稼年  王荣昌  俞载道 《地震工程与工程振动》1995,(1)

本文研究了地基土-桩-核岛辅助厂房结构相互作用体系在地震激励时的“平-扭”耦联动力响应,在分析中分别采用M.Novak的近似理论,M.Novak常数法,M法,常数法计算了桩基础的阻抗函数,并考虑了在同一基础上的安全壳和另一辅助厂房对所研究的辅助厂房动力响应的影响。  相似文献   

红树植物秋茄根际链霉菌(Streptomyces)146产生的几丁质酶     

郑志成  周美英 《台湾海峡》1993,(1)

本文报道分离自厦门集美红树植物秋茄根际的链霉菌146菌株(Streptomycessp.146)产生几丁质酶(Chitinase)的条件及该酶的一些性质。结果表明,有机氮源能促进几丁质酶的合成,该菌在添加1.5%玉米浆或2.0%麸皮的诱导培养基中发酵的酶活性较高。产酶适宜培养基初始pH 为7.0,适宜温度30℃,发酵5～6d 酶活性达到高峰。该酶能被多种几丁质所诱导,是一种诱导酶,它对几丁质水解活性pH 范围为3～8.5,最适pH 为5.5,在pH 为4～7.5范围内较稳定。该酶在30～60℃之间酶活性随温度的升高而增高,而且酶稳定.  相似文献   

厦门及其邻区海岸高等植物的分布   总被引：1，自引：1，他引：1  

张娆挺  顾莉 《台湾海峡》1991,10(4):386-391

本文研究了厦门及其邻区海岸高等植物的种类组成、分布规律和植物群落概貌。鉴定了该区海岸高等植物325种,隶属于228属79科,其中沙生和盐生植物有43种。据海岸基质类型的不同,可分为沙生、盐生、基岩和广生境4个生态类群。有15个主要植物群落,如海边月见菜、红树林、草海桐群落等。  相似文献   

南庄头遗址的古植被和古环境演变与人类活动的关系   总被引：9，自引：1，他引：9  

李月从  王开发  张玉兰 《海洋地质与第四纪地质》2000,20(3):23-30

结合考古、孢粉及硅酸体研究的资料,分析了南庄头遗址的古植被、古气候、古环境的演变与人类活动的关系,研究表明：南庄头人知时期属于早全新世气候升温期,气候不稳定,但总体来说与现代相关差不大,晚期可能比现代更温暖湿润,局部地区出现水蕨,从本剖面的分析来看,没有足够证据证明当时农业已出现。  相似文献   

Ecosystem service values of sediment generation and entrapment by marginal coral reefs at Sodwana Bay,South Africa     

SCS Laing  MH Schleyer  JK Turpie 《African Journal of Marine Science》2020,42(2):199-207

Coral reefs provide a multitude of goods and services, some of which are difficult to value due to their intangible nature and the absence of markets to ascribe their relative worth. The coral reefs of Sodwana Bay on the northeast coast of South Africa provide several ecological goods and services, of which only two are considered here: namely, sediment generation and sediment entrapment. Both are deemed essential to the functioning of the Sodwana Bay economy. The replacement-cost method was used to estimate the annual financial cost of sediment provided to the study area if it were replaced by dredging. Sediment generation by the coral reefs was valued at R2.6–R4.8 million, and sediment entrapment valued at R71.8–R84.6 million, totalling between R74.4 million and R89.4 million (≈$5.6–$6.7 million, at R13.38/US$1) per year.  相似文献