东莞市"绿韵"生态园区生物变化调查

东莞市"绿韵"生态园区经过近4年的建设,植物种类从原来的175种上升到263种,各类品种资源丰富,布局合理;鸟类、蛙类、蜘蛛、蛇类等野生动物日渐增多,有害昆虫种类数从原来的41种降到36种,主要害虫的种群密度在下降,有益昆虫种类数从原来的8种上升到14种,大多数有益昆虫的种群密度在上升;作物病害的种类数从原来的55种下降到34种,一些主要作物病害发病率在下降。

Investigation on the variety of biology in Luyun Ecological Garden of Dongguan

After four years' construction,the Lu Yun ecological garden has the following achievements: it has rich plant species with an appropriate arrangement,the number ascending through 175 to 263;the number of wild animals is becoming larger and larger,for example the avifauna,batrachia,spider and snake,in contrast,the number of baneful insects is becoming smaller and smaller,through 41 to 36,but the number of salutary insects through 8 to 14;the types of plant diseases,through 55 to 34,the incidence of a disease is dropping.