首都圈典型沙区水分资源的变化趋势及其利用

本文简要介绍了首都圈典型沙区农业地理概况。从年降水量的时空变化、频率计算等方面 ,分析了本区水分条件的地区差异。在年降水量的频率计算中 ,采用了皮尔逊 III型模型与韦克比分布进行模拟 ,其结果均能符合精度要求。根据丰宁县的面降水量系列 ,采用了自回归分析、方差分析与谱分析确定该系列的周期。在水分资源利用方面 ,分析了主要作物的农业气象指标、水分生产函数 ,并建议了主要作物的综合增产技术以及改善农业供水条件的有效措施。

Changing Tendencies and Utilizations of Water Resources in the Typical Sand Regions around Beijing

The surveys of agricultural geography in the typical sand regions around Beijing are briefly indroduced in this paper. The regional differences of water condition in the typical sand regions are analyzed from the aspects of the time space change and the frequency calculation of annual precipitation. The Pealson Type-III Model and Wakeby Distribution are used to simulate the frequency distribution of annual precipitation, and the results that accord with the demands of the precision are obtained. According to the annual area precipitation series of Fengning County, the periodicities with the annual area precipitation are determined by the autoregression analysis, the variance analysis and the spectrom analysis. The agrometeorology indexes and the water yield functions of the main crops are analyzed in water condition utilization. That also suggested in the part are the comprehensive yield increasing techniques of the main crops, shch as naked oats, potato and pea, and the effective measures for improving the condition of agricultural water supply, including the natural protective system of farmland in the rain fed agriculture regions and water saving agriculture in the irrigated agriculture regions.