上海地区油菜田杂草种群年际发生型判别分析

DISCRIMINATION AND ANALYSIS OF THE DIFFERENT PATTERNS OCCURRENCE LAW OF WEED POPULATION IN RAPESEED FIELDS IN SHANGHAI REGIONS

根据 1992～ 2 0 0 2年稻茬免耕油菜田禾本科和阔叶类杂草自然发生量的观测资料 ,禾本科类杂草划分为偏多发生年、正常发生年和偏少发生年 3种年型 ,阔叶类杂草划分为偏多发生年和偏少发生年 2种年型 ,并分别分析不同年型杂草种群发生规律和危害程度差异 ;同时 ,采用A B型投票法对禾本科和阔叶类杂草发生年型作判别分析 ,上述结果对于制定防除杂草策略和提高防效。

Based on the observation data of the number of natural occurrence of grass and broad leaved weeds in rice stubble no tillage rapeseed field during 1992 to 2002, grass weeds occurrence was divided into 3 patterns and broad leaved weeds occurrence was divided into 2 patterns. Occurrence law of weed population in different year type and the difference of damaged level were analyzed. Meanwhile, occurrence year type of grass weeds and broad leaved weeds was discriminated using A B type ballot ways. These date will provide a valuable reference for formulating the tactics of controlling weed, raising control efficiency and reducing costs.