【摘 要】
：
Forests in Northeast China in the Greater and Lesser Khingan Mountains (GKM and LKM) account for nearly 1/3 of the total state-owned forests in the country. Regional and historical comparisons of forest plants and macrofungi will favor biological conserva
【机 构】
：
Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences,Changchun 130102, Peop
论文部分内容阅读
Forests in Northeast China in the Greater and Lesser Khingan Mountains (GKM and LKM) account for nearly 1/3 of the total state-owned forests in the country. Regional and historical comparisons of forest plants and macrofungi will favor biological conservation, forest man-agement and economic development. A total of 1067 sam-pling plots were surveyed on forest composition and struc-ture, with a macrofungi survey at Liangshui and Huzhong Nature Reserves in the center of two regions. Regional and historical differences of these parameters were analyzed with a redundancy ordination of their complex associations. There were 61–76 families, 189–196 genera, and 369–384 species, which was only 1/3 of the historical records. The same dominant species were larch and birch with Korean pine (a climax species) less as expected from past surveys in the LKM. Shrub and herb species were different in the two regions, as expected from historical records. There was 10–50％ lower species diversity (except for herb even-ness), but 1.8- to 4-time higher macrofungi diversity in the GKM. Compared with the LKM, both tree heights and mac-rofungi density were higher. Nevertheless, current heights averaging 10 m are half of historical records (> 20 m in the 1960s). Edible macrofungi were the highest proportion in both regions, about twice that of other fungal groups, hav-ing important roles in the local economy. A major factor explaining plant diversity variations in both regions was herb cover, followed by shrubs in the GKM and herb-dominant species in the LKM. Factors responsible for macrofungi variations were tree density and shrub height. Vaccinium vitis-idaea and Larix gmelinii in the GKM but tree size and diversity were important factors in the LKM. Our findings highlighted large spatial and historical differences between the GKM and LKM in plant-macrofungal composition, forest structure, and their complex associations, which will favor precise conservation and management of forest resources in two region in the future.
其他文献
本文依托鸡西工业文化与历史、储量丰富的工业资源、工业旅游资源和重要遗址、丰富工业产品和不断优化的工业格局,分析在开展工业旅游过程中,旅游开发与宣传推广方式、深度体验开发与沉浸式功能、专题旅游线路旅游、区域联动合力、旅游形象知名度等方面存在的问题,提出充分利用互联网优势,开展工业旅游自我设计的个性化服务和虚拟旅游体验,并从工业旅游多维度体验设计、开发工业旅游系列专题旅游线路、与域外旅行社和工业旅游资源地合作开发推介、加大工业旅游宣传推介力度、打造教育功能突出的工业旅游研学基地等方面提出创新发展建议.
In forest modeling to estimate the volume of wood, artificial intelligence has been shown to be quite effi-cient, especially using artificial neural networks (ANNs). Here we tested whether diameter at breast height (DBH) and the total plant height (Ht) of
It is important to evaluate nitrogen use effi-ciency and nitrogen tolerance of trees in order to improve their productivity.In this study,both were evaluated for 338 Populus deltoides genotypes from six provenances.The plants were cultured under normal ni
Ground-level ozone -(O3) is a widespread air pollutant causing extensive injuries in plants. However, its effects on perennial energy crops remain poorly under-stood due to technical difficulties in cultivating fast-growing shrubs for biomass production u
The NAC transcription factor family is plant-specific with various biological functions. However, there are few studies on the NAC gene involving coniferous spe-cies. Bioinformatics research and expression analysis of NAC genes in Larix olgensis can be us
在低碳经济和全域旅游背景下,浙西地区文化旅游产业已经逐渐成为经济发展的中坚力量,对区域经济发展升级和结构转型有着重要战略意义.本文遵循科学、有效性原则,构建了文化旅游产业竞争力评价指标体系,运用因子分析法对浙西地区文化旅游产业竞争力进行了分析,认为浙西地区文化旅游产业虽取得了良好发展,但在产业基础、产业吸引、产业环境等方面还存在较大提升空间.
随着垃圾分类政策在我国正式颁布,各省市都展开相关的活动.为了更好地营造“绿色社区”,改善社区居民的用户体验以及社区的工作效率,一个克服了传统垃圾分类弊端,基于“互联网+”的智能垃圾分类模式应运而生.研究如何将智能垃圾分类模式应用于社区 日常垃圾分类的工作中,将人工智能与垃圾分类相结合,对于践行国家垃圾分类的相关政策有重要的实践意义.
To promote the application of Trichoderma,many countries have collected Trichoderma resources.In the present study,nine isolates were isolated from a rhizos-phere soil of Phellodendron amurense and were identified as three species:Trichoderma brevicompact
老吾老以及人之老,百善孝为先,如何让老人有一个精神富足而又舒心的晚年生活,是我们每一位为人子女者所关注的,随着社会快节奏的发展,年轻人因为工作奔波而无暇顾及,加之三孩政策的来临,养老与老人心理健康问题日益凸显.
自从“放管服”改革概念提出之后,全国各地政府都在推进“放管服”改革.要深化“放管服”改革,实现“数据跑路”代替“群众跑腿”,关键问题是要解决好政务大数据资源共享.广西把深化“放管服”改革作为推动高质量发展的有效抓手,不断提升政务服务效能,持续优化营商环境,于2019年11月出台了相关方案并提出“一池共享”,将政务的数据资源进行整合,构建政务大数据资源池并共享.本文针对广西政务大数据资源在共享过程中遇到的障碍进行分析,探讨在“放管服”改革过程中典型案例成功的原因,并提出相应的对策建议.