节点文献
林下参种植光环境评价系统的研究
Study on Evaluation System of Sunlight Environment of Panax Planting under Forest
【作者】 张志平;
【导师】 于海业;
【作者基本信息】 吉林大学 , 农业生物环境与能源工程, 2007, 硕士
【摘要】 针对目前人参种植业存在的问题,提出在人工林下栽参的社会价值与经济价值,在此背景下研究人工林下对人参生长影响最大的光环境。本课题的研究将把各种模型(人工林单株圆锥形树冠坡面投影边界模型、人工林下太阳辐射模型)及人参生长适应性评价、不同生态区的太阳辐射资源评价、林业资源信息等与GIS技术相结合,使大量的数据信息、复杂的模型和判别方法通过计算机处理后更准确、快捷,而且具有可视化效果,使用户更容易,更方便的了解林下光环境。在地理信息系统工具支持下,将地理信息系统软件工具作为原功能重新组织,在充分了解数据结构的基础上,开发由底层到高层的应用系统,设计实用的应用界面,建立“基于GIS的林下参种植光环境计算机信息管理及综合评价系统”。
【Abstract】 Planting the Panax under the forest, does not need the loose earth and move weeds, does not have to apply fertilizer and to spurt hits the agricultural chemicals, only supplies the artificial ecological environment condition, which suits its growth , lets things take their natural course to grow. As a result ,how chooses and creates this kind of ideal ecological environment condition, specially the crucial function light environment grows to the Panax, becomes a tache of success or failure to plant the Panax for under the forest much. Because in the forest the crown and covers to the solar light absorption, the forest lower light environment change far wants complex many compared to the Panax awning in situation. Along with the crown growth, may arrive the under forest solar bolometric radiation value to change, the perpendicular incidence and the diffused light proportion changes, the forest land inscribes the solar spectrum ingredient and the quantity which receives all has differently. The trees branches and leaves extend also directly because under the forest the different position light environment existence differently. Then, the existing findings already by far were unable to satisfy under the forest to plant the Panax focusing ring boundary forecast the need. Therefore, how through the existing knowledge, establishes each kind of model, forecast in the planted forest the light environment distributed situation, instructs under the forest to plant the Panax well, the full use existing forestry resources, develops a bigger economy and the ecology benefit, will be the present and the future suspends in front of us a important task.This topic research each kind of model (under planted forest single cone crown slope face projection boundary model, forest solar radiation model) and the Panax growth compatibility appraisal, the different ecology area solar radiation resources appraisal, the forestry resources information and so on will unify with the GIS technology, Causes the massive data message, the complex model and the distinction method after computer processing more accurate, quickly, moreover has the visible effect, makes the user to be easier, the more convenient understanding forest lower light environment, reasonably transplants the Panax. May for the research different forest region in the Panax growth, the photosynthesis basic rule, the forest region plan, the region production, the specialized planter provide the rationale and the scientific method; Meanwhile carries on the synthesis using the information method and the analog modeling the forest lower light environment resources appraisal, can precisely provide the policy-making basis for the Panax planter, This research carries on the synthesis appraisal to the larch planted forest planter area in light environment, to distinguished under the different forest lower light environment the Panax growth compatibility, has its theory value and the practice significance. Under the geographic information system tool support, the geographic information system software tool took the original function reorganizes, in the full understanding construction of data foundation, develops from the first floor to the high level application system, designs the practical application contact surface, the establishment "the Panax plants under the forest the light environment computer information management and the synthesis appraisal system based on GIS ".This system fully uses ArcView each function, opens the bill cone crown slope face projection boundary model using the C++ language, under the forest the solar radiation model (bolometric radiation, perpendicular incidence radiation, scattered radiation) as well asunder the forest each sunshine time model, and realization and AreView platform integration; Using the Avenue object-oriented programming language and the development environment, formulate the corresponding user contact surface, increases the specific function, thus establishment forest lower light environment forecast appraisal system. This system may in the visual display research area the light spatial distribution characteristic, be able to realize studies the region the spatial data and the attribute data interactive query, simultaneously may directly carry on the real-time forecast appraisal using the forecast model to the forest lower light environment, and the focusing ring boundary carries on the direct-viewing demonstration. When has the new research, the system may realize the as necessary renewal and the maintenance.This research is the ecology specialized knowledge and the information technology unifies, has established under the planted forest from the quite actual angle under the geographic information system environment the solar radiation model. The model may widely apply under the planted forest light aspect and so on environment analysis, forecast, appraisal, specially pays great attention to the solar radiation the spatial variation domain. This research institute obtains the conclusion has following several points:(1) This system has established the solar radiation model under the GIS environment, this model had achieved needed the parameter to be few, which can accurate rate high characteristic. The model does not need the bureau place meteorology parameter, only must have studies the region the foundation data to be possible to calculate the solar radiation quantity. This model may calculate the direct solar radiation quantity, the simple scattered radiation quantity, the direct radiation intensity, the scattered radiation intensity, the sunshine time, the solar elevation angle, the azimuth as well as the solar declination and some latitude and longitude flat land sunrise sunset. The computation sunshine time accurate rate achieved above 95%, the direct radiation quantity is accurate rate also achieves 90%.(2) This system take Arc View as the platform, established under the planted forest to plant the senate light environment forecast appraisal system. This system formation is the GIS technology and the planted forest lower light environment forecast the model unifies together crystallization. May to study all information using this system which in the region collects to carry on the unification management, the bidirectional interaction inquiry and to the forest lower light environment realization real-time, the visible stable forecast appraisal, and plants the light environment question for the actual forest under which in the senate meets to provide the auxiliary decision-making.(3) This research has independently compiled three kind of forecasts models algorithm procedure and these procedures dynamic connection storehouses using the C++ language (Dynamic Link Library, DLL);Language has compiled various models dynamic connection using Arc View own two developments language Avenue, has realized the forecast model and the system integration, and has ordered the corresponding system user contact surface. The systematization forecast which for the planted forest lower light environment stability, visible has provided a feasible system platform and the good movement environment.(4) This system was the geographic information system increased a new module. Finally under right-of-way map form direct-viewing expression planted forest solar radiation quantity distribution. In order to study and the production application provides the more regions data. The meteorological knowledge background person also cannot the very convenient application, and can obtain a more accurate data.
- 【网络出版投稿人】 吉林大学 【网络出版年期】2007年 03期
- 【分类号】S567.51
- 【被引频次】3
- 【下载频次】241