The paper gives the BP neural network model for crop water requirement. On the basis of this, the main crop irrigation water requirement estimation methods were raised.
在此基础给出了主要农作物各生育期内的灌溉需水量估算方法。
参考来源 - 干旱灌区灌溉管理信息系统研究与应用Through analyzing the means of forest carbon sequestration estimation, the results of forest carbon sequestration differ with the estimation methods and parameter.
通过对现有森林碳汇计量方法进行详细分析后发现,采用的计量方法不同,采用的参数不同,得到的森林碳汇结果也不相同,甚至差异性很大。
参考来源 - 森林碳汇计量和核查方法研究Ten indexes of social economy appraisal and nine indexes of ecological environment appraisal as well as the corresponding estimation methods are put forward and discussed,in expectation of giving the scientific support for the decision-making of river basin hydroelectric development.
从社会经济和生态环境角度出发,在分析流域水电规划实施后可能产生各种影响的基础上,构建了相应的影响因素识别矩阵,进而分别探讨了社会经济10项评价指标、生态环境9项评价指标及其相应的估算方法,以期为流域水电开发决策提供科学支撑。
参考来源 - 流域水电规划环境影响的经济评价指标与方法探讨·2,447,543篇论文数据，部分数据来源于NoteExpress
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