天然草场最适补播期的气象条件研究

STUDY ON METEROLOGICAL CONDITIONS OF NATURAL GRASSLAND IN THE OPTIMUM SUPPLEMENTARY SOWING PERIOD

针对草场退化的突出问题，采用分期补播不同处理的试验方法，研究了典型草原最适补播期的气候指标：旬平均气温＞ｌ５℃且播后有≥１０ｍｍ降水过程，使土壤湿度占田间持水量保持在４０％以上。在锡林郭勒盟最适补播期为６月中旬～７月中旬。松土补播对气象指标的要求低于飞播。

To the problem of dege nerative grassland,the method of supplementary sowing was used,the paperstudied the climatic index of the optimum supplementary sowing period in typical grassland:mean ten daystemperature≥15℃,and≥10mm precipitation after sowing,so that the soil moisture maitained more than40% The optimum sunplementary sowing period was from mid June to mid July in XilinguoleThe needfor meteorological index was lower with loosening supplementary sowing than by air plane.