【作者】 唐洁；

【导师】 唐启义；

【作者基本信息】 浙江大学 ， 农业昆虫与害虫防治， 2006， 硕士

【摘要】 本研究是由国家自然科学基金项目“水稻主要害虫灾变风险分析多水平模型研究”(项目编号为:30370914)资助,以水稻二化螟为例,对影响水稻二化螟发生的关键因子进行分析、辨识,并建立了影响水稻二化螟发生的多层线性模型。 本研究从生态系统的观点出发,考虑水稻二化螟发生处于不同地区,受不同地区地理、生态因子影响,使得水稻二化螟发生因素存在层次结构。本文作者应用多层线性模型统计分析技术,参考已发表文献资料以及现有数据,建立了水稻二化螟发生和地理、生态及气象因子关系的两水平线性模型,以期找出影响水稻二化螟发生关键因子、探讨不同生态系统层次对水稻二化螟发生的影响。本研究主要结果如下: 1.建立了水稻病虫、气象资料数据库,及其数据管理、查询系统 (1) 水稻病虫资料数据库的建立本研究分析所用病虫资料来源于浙江省34个县市水稻主要病虫区划资料统计表1981～2000二十年间数据(部分资料有缺失,实际用的只有26个县市资料)。对病虫数据资料进行整理并输入计算机,建立Access数据库并按病虫害种类建立若干相应病虫害发生情况数据表,包括稻飞虱、二化螟、三化螟、稻纵卷叶螟、稻瘟病、纹枯病、白叶枯病。 (2) 分析所需气象、地理、生态资料数据库的建立分析所需的气象资料来源于浙江省气象局1981～2000二十年间气象数据资料,将气象资料按旬进行整理并输入计算机,建立Access数据库并分别建立各个地区逐句气象资料数据表,包括温雨系数、温湿系数、最高温度、最低温度、平均温度、雨日、湿度、日照时数、降雨量、生态因子。数据库的建立为进一步运用HLM软件进行多层线性模型分析提供基础数据。 (3) 建立了水稻病虫和气象资料数据管理、查询系统,可自动地从数据库重检索数据,以用于水稻病虫多水平建模分析。 2.水稻二化螟两水平线性模型研究 应用多层线性模型原理,首先采用DPS统计软件筛选主要因子,然后应用HLM6.0分析软件,根据筛选的因子构建水稻二化螟两水平线性模型。经DPS软件分析、筛选,模型选入的第一层次的影响因子主要有:4月下旬最低温度、4月下旬湿度、5月上旬降雨量、5月中旬温雨系数,以及上年二化螟晚稻发生程度。应用HLM6.0分析软件组建的回归模型中的5个预测变量对二化螟的发生程度都存在显著影响:4月下旬最低温度(P=0.043)、4月下旬湿度(P=0.026)、5月上旬降雨量(P=0.011)、5月中旬温雨系数(P=0.007)以及上年晚稻发生程度(P=0.008)。 模型选入的第二层,即地理、生态因子有化肥用量、丘陵比及林地比。结合第一层次的影响因子,构成的模型对早稻二化螟的影响,其显著水平大多小于0.01(即作用极显著)。 根据上述因子建立的多层线性模型,对早稻水稻二化螟发生与生态、气象及地理因子关更多还原

【Abstract】 This research is subsidized by National Natural Science Fund, "Research on Multilevel Models of Risks Analysis for Rice Insect Pests" (No.30370914) . This research analyzed and distinguished the key factors that influence the occurrence of striped stem borer, Chilo suppressalis. Applying the Hierarchical Linear Modeling (HLM) statistical technology, a two-level HLM model of the outbreaking of the striped stem borer over a large area was established. The mode was used to explain the key factors which influence the occurrence of Chilo suppressalis and probe into the influence of each ecosystem level upon the occurrence of Chilo suppressalis from the point of view of the Agricultural Ecosystem. The main results of this research are as follow:1. Establishment of information management system for rice insect pests and meteorological factors(1) Establishment of database for rice insect pests. The data of rice insect pests are come from 34 countries of Zhejiang province during the 20 years from 1981 to 2000 in this research. We sort out the data and put data into the computer. Microsoft Access was used to develop database management system for rice insect pests.(2) Establishment of database for meteorological, geographic, ecological factors. The data of meteorological factors are come from weather bureau of Zhejiang Province during the 20 years from 1981 to 2000 in this research. We tidy the data and put them into the computer. The database included the temperature-rainfall coefficient, the hygrothermal coefficient, maximum temperature, minimum temperature, average temperature, rain day, humidity, sunlight time, rainfall and other ecological factors.(3) We build the information management system for management and inquire of pest and meteorological data. The system can help us to get data from database convenient for the modeling.2. Study on the two-level hierarchical linear modeling for Chilo suppressalisConsidering the hierarchical structure of agricultural ecological system and applying the HLM statistical technology, a two-level HLM model for Chilo suppressalis was built. In the first level, 4 climatic factors and one pest factor was introduced into the model. They are minimum temperature in the late April, humidity in late April, rainfall in the early May, temperature-rainfall coefficient in the middle May and the occurrence degree of last-season rice. The level-1 regression model included 5 key factors which have significantly influence on the occurrence of Chilo suppressalis, such as minimum temperature in the late April (P=0.043 ) , humidity in late April (P=0.026) , rainfall in the late May (P=0.011) , temperature-rainfall coefficient in the middleMay (.P=0.007) , the occurrence degree of last-season rice (jP=0.008) .In the second level, three factors, the level of chemical fertilizer, percentage of hills cover, and percentage of forest land was introduced into the model. Combining the influence of the level-1 key factors, the level-2 key factors have significantly influence (/K0.01) on the occurrence of Chilo suppressalis of early-season rice in the final two-level linear model.Based on the hierarchical linear model, author carried out the analysis of the relationship between the occurrence of Chilo suppressalis and ecological, meteorological and geographic factors, and made clear several points as below:First, the results indicate that the most important factors that influence the occurrence of striped stem borer are still from the individual meteorological factors, which take about 56% of the total variance. But the inter-regional level factors can not be ignored, which take about 44% of the total variance.Second, between the intra-regional key factors (the level-1 key factors), the number of pest sources is the most significant, and the temperature-rainfall coefficient in middle May is the most significant in meteorological factors.Finally, between the inter-regional key factors (the level-2 key factors ) , the area percentage of hills land is likely most significant (the frequency is 3/6) , and the other factor is the percentage of forest land (the frequency is 2/6) , and the level of chemical fertilizer (the frequency is 2/6) . The result indicated that the regional difference is mainly come from geographic factors.更多还原