摘要
在全年逐月对龙滩子水库浮游藻类定量、定性研究的基础上，利用频度率的大小得出了３个浮游藻类种组．并根据Ｋｏｋｗｉｔｚ和Ｍａｒｓｏｎ的污水生物系统，结合藻类指标、ｄ值、ＣＯＤ和ＢＯＤ５的Ｐｉ值以及其它理化分析．结果表明，龙滩子水库水体为乙型中污水质，并有向甲型中污水体演变的趋势．
Life halits of cevacris kinangsu were found out from 3 years study.According to macrocosmic control theory of sistem engineering,comprehensive measures were abopted,such as bio.logical prevention,meanually digging insect eggs,protecting and using their natural enemies,chemical pretection etc.The preventive area of cevacris kiangsu was 1066hm 2,the average density of insect pest situation drsped from 358 to 1 4 per tree.The rate of insect drop was 99 6 per cent.The loss of 4 8 ten thousand tons wood was retrieved,worthing 960 million Yuan.
出处
《西南师范大学学报（自然科学版）》
CAS
CSCD
北大核心
1997年第4期430-435,共6页
Journal of Southwest China Normal University(Natural Science Edition)
