共查询到20条相似文献，搜索用时 375 毫秒
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笔者采用EL-5100计算器进行抚育强度的计算,并对设计抚育强度和计算抚育强度进行了比较。通过建立回归方程,进行方差分析和几何解析,证实该计算方法的实用性和可行性。结果表明,该方法能够使外业调查在1 min~2 min的时间内现地控制抚育强度,为天然林保护工程快速确定抚育强度提供参考。 相似文献
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文章介绍适用于PC-E500计算器使用的、采用TRUE BASIC语言编制的路线平面线型定测计算程序,论述程序的基本结构、数据输入与结果输出及使用方法,并举例说明源程序的应用。 相似文献
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Excel软件在林木采伐作业设计角规样地中的应用 总被引：1，自引：0，他引：1
利用Excel软件的函数功能,建立林木采伐作业设计角规样地表,操作规程为:1填写树种名和形高、出材率代码;2录入树种、径阶、断面积、平均高等调查数据;3填写采伐小班面积,其它数据可自动生成并进行汇总计算。通过Excel软件解决了角规样地调查内业查表、计算等工作繁琐、容易出错等问题。 相似文献
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1974年以来,我省进行过三次较大规模的森林资源清查。历次清查的内业计算工作都是手算的,因此工作量大、效率低而且容易出差错。现在运用DJS—21型电子计算机对遂川县牙前林区二类清查的外业资料进行了电算,输出的4000多个数据与手算的完全符合,首批电算数据已被采用,试验获得满意的结果。现将“森林资源二类清查DJS——21机ALGOL_(60)源程序”作一介绍。 相似文献
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以安徽省旌德县森林资源规划设计调查中小班角规调查杉-松-阔模块为例,阐述了利用Excel VBA对角规调查数据内业处理进行二次开发,实现角规调查小班蓄积量的自动计算,可避免二类调查查找引用数据量大、计算耗时长,且容易出错的问题。通过二类调查人员的实践操作应用,角规调查小班蓄积量的自动计算程序的计算结果正确,工作效率高,具有较高的实用价值。 相似文献
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介绍了调查火灾原因的几个步骤,通过排查不可能因素,依据火行为、林火原理、林火蔓延方向和检查确定初起火点区域等方法来寻找起火点。阐述了如何调查和计算火场面积,设置火烧迹地标准地计算损失,用什么标准来衡量林木受害程度,林木损失计算应包括的内容,如何建立火灾档案。 相似文献
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王振东 《林业机械与木工设备》2011,39(12)
介绍了高射程低污染林木病虫害风送喷药机总体方案的设计,其改变了常规的轴流风机传动方式,以越野性能较好的拖拉机作为机动平台和风机驱动的动力源,简化了整个设备的结构,减轻了整机质量,提高了设备作业的适应性。在喷药机上增加自动对靶、静电喷头和药液变量控制装置,提高了药物利用率并降低了环境污染。 相似文献
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从70年代开始,随着微机的普及、推广,多元统计分析方法及其他数值分析方法在各个领域得到越来越广泛的应用。这就产生了两种要求:一是系统总结多元统计分析方法理论和应用情况,评价它在林业中应用的可能及前途;二是要为微机配置一套通用程序,使林业工作者从繁重的计算工作中解放出来,使多元统计分析方法付诸实施,也有利于多元统计分析 相似文献
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Stock quality testing (SQT) is a vital component of forest regeneration programs world-wide. SQT consists of stock quality control (SQC) during production at the nursery and planting stock quality assessment (PSQA) prior to planting. Current tests being used for SQC and PSQA are reviewed, indicating whether they are used on an operational or research scale. Prediction of growth by PSQA is still not far advanced, and the operational application of physiological methods in particular in SQT is still limited, although progress varies according to country or region. Challenges in implementation of operational SQT are reviewed, and a 'total quality management' approach to addressing the challenges is proposed. 相似文献
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Kathryn G. Arano Ian A. Munn John E. Gunter Steven H. Bullard Max L. Doolittle 《Small-Scale Forestry》2004,3(2):177-190
The absence of available credit to finance reforestation investments among NIPF landowners has been one of the contributing
reasons why landowners do not reforest after harvest. Financial assistance programs are therefore a solution to initiating
reforestation investments. However, previous studies indicate many landowners are not actively participating in existing government
assistance programs. This paper examines reforestation loans as an alternative financial assistance program. Landowner participation
in a proposed reforestation loan program is modeled using logistic regression. Results indicate that landowner participation
in the program is influenced by ownership size, socio-demographic characteristics, and availability of other forestry incentive
and assistance programs. 相似文献
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对目前我国营造林的作业设计,特别是林业重点工程的作业设计要求与现状进行了介绍与分析。根据近几年国家林业重点工程综合核查的有关资料,对影响我国营造林作业设计质量的因素进行了较详细的分析,并提出了提高我国营造林作业设计质量的对策与措施。 相似文献
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Paul Winters Chanisa Niljinda Ben Chen Helena Nery Alves-Pinto Melisa Ongun 《Journal of Sustainable Forestry》2015,34(6-7):581-604
Voluntary certification programs are one type of intervention used to incentivize the agricultural commodity sector in tropical landscapes to reduce deforestation and improve sustainability. Cases of the Roundtable on Sustainable Palm Oil (RSPO) voluntary certification program in Indonesia and the Sustainable Agriculture Network (SAN), voluntary certification for cattle in Brazil, are used to contrast the role taken in two significantly different programs to render sustainability outcomes. While producers in both countries follow a similar path toward compliance with certification standards, only the RSPO program offers enticements for producers to participate in the intermediate stages of compliance by offering membership in its affiliated industry roundtable. Design choices about the core activities of a program (adoption, implementation, and enforcement and monitoring) that are ancillary to standards setting are found to be opportunities for providing benefits to both producers and civil society stakeholders without compromising the program’s rigor. A framework is proposed to understand voluntary certification programs as both creators and brokers of benefits between producers and other sustainability stakeholders, potentially providing an approach to simultaneously increase participation and maintain program rigor. 相似文献
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Nick F. Emtage 《Small-Scale Forestry》2004,3(3):319-336
This paper reviews the existing social and community forestry programs in the Philippines, these being the leading programs
for natural resource management and rural development in the country. The paper takes the form of a stakeholder analysis of
those involved in the Community-Based Forest Management Program, drawing on literature discussing the roles of and challenges
faced by the various stakeholder groups and on interviews with participants in the program. Challenges to the success of the
program come from a variety of sources, in particular from the economically and socially marginalised position of the target
communities, lack of resources available to support them, deficiencies in physical and social infrastructure in the Philippines,
and the difficulties caused by the continual revision of forestry policies and regulations. It is concluded that in order
for CBFM to be successful, greater efforts are needed to ‘empower’ the communities, provide adequate budgetary support to
agencies administering the program, and provide a stable policy and regulatory framework. 相似文献
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Reforestation programs are a common policy response among developing country governments in the tropics attempting to deal with environmental and economic problems caused by widespread deforestation. The objective of this paper is to examine participation by small-and medium-sized farms in two reforestation programs undertaken in recent years by one country, Costa Rica, which has been at the forefront of developing country environmental protection efforts. Analysis of a survey of 243 program participants and non-participants shows that farm households participating in reforestation programs had generally larger farm sizes, were dedicated to low labor-intensive, land-extensive agricultural activities, faced significant family on-farm labor constraints, were more heavily dependent on off-farm income sources, and had more extensive contact with local extension efforts. Logistic regression is employed to econometrically identify demographic, economic, and land use determinants of farm household participation in reforestation programs; the implications of these findings are analyzed. The limitations of reforestation programs, especially with regard to management factors and quality of reforested plots, are reviewed. Implications for improving the efficiency of reforestation programs and the merits of other policy alternatives are also discussed. 相似文献
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Linda L. Chinangwa Andrew S. Pullin Neal Hockley 《Journal of Sustainable Forestry》2017,36(4):338-357
Forest co-management programs aim to conserve forest resources. However, there is little evidence of its effectiveness. We assess the impact of co-management approaches on forest conditions in Zomba-Malosa and Ntchisi forest reserves in Malawi using a multiple-site, plot-based, and control-intervention design. We used tree density and species richness as indicators of forest condition. Evidence of human activities was used as potential indicators of current and future impacts. Local peoples’ perceptions of the impact of co-management on forest were also sought to validate the inventory information. Co-managed plots have higher tree density than state managed plots. Indicators of human activities including felled trees, farming and settlement plots, and grazing, were observed in both co-managed and state managed forest block. A majority of respondents, 84% in Zomba-Malosa and 73% in Ntchisi, perceive the co-management program to have a positive impact on forest conditions against a general worsening trend. Despite having a potential to improve forest conditions, the findings suggest that the outcomes of a co-management may vary depending on preexisting conditions and how communities understand and interpret the program. Hence, programs should not be implemented as a universal package. Furthermore, even with method triangulation, the lack of baseline data limited the quantification impacts; hence, integration of participatory research into the program is recommended. 相似文献