广东双季稻区杂草地和稻田中捕食性节肢动物的群落动态

用吸虫器采样法，于1998年对广东省大沙镇双季稻区两块相邻的杂草地和稻田中捕食性节肢动物群落的结构进行了研究。在杂草地生境中共采集到73种捕食性节肢动物，其中55种为蜘蛛，18种为昆虫。3月21日，早稻田翻耕前，在杂草地中采集到33种捕食性节肢动物，密度为130头/m²。4月4日，水稻移栽1周后，在杂草地中采到29种捕食性节肢动物，密度为92头/m²；同期在稻田中采到12种捕食性节肢动物，密度为16.2头/m2。5月13日早稻成熟前期，在杂草地中只采到19种捕食性节肢动物，密度为28头/m²；而此期，在稻田中采到27种捕食性节肢动物，密度为53.2头/m²。在晚稻生长期，杂草地捕食性节肢动物与稻田捕食性节肢动物物种数和密度的变化与早稻生长期情况相似。杂草地与稻田两生境间的捕食性节肢动物群落的相似性系数大于0.5，由此可见，这两类生境中捕食性节肢动物的物种组成是非常相似的，具有较多的共有种。杂草地捕食性节肢动物群落可能是稻田捕食性节肢动物群落重建的重要种库之一。

The community dynamics of predatory arthropods in both weed habitat and paddy field from a double cropping paddy in Guangdong

The community structure of predatory arthropods in a weed habitat and a neighboring paddy field from a double cropping paddy in Dasha Town, Guangdong Province was investigated with the suction sampler in 1998. In total, 73 predator species, including 55 species of spiders and 18 species of insects, were collected in the weed habitat. On March 21, when the field had been ploughed for planting early rice, 33 species of predatory arthropods were collected with the density of 130 predators /m 2 in the weed habitat. On April 4, one week later the seedlings were transplanted, 29 species of predatory arthropods with the density of 92 predators /m 2 and 12 species with the density of 16.2 predators /m 2 were collected in the weed habitat and the rice field, respectively. On May 13, early rice coming to mature, only 19 species of predatory arthropods with the density of 28 predators /m 2 were collected in the weed habitat while 27 species with the density of 53.2 predators /m 2 were collected in the rice field. The similarity coefficients of the predatory arthropod communities in the weed habitat and the rice field were over 0.5, indicating many common species of predatory arthropods in the two habitats. These results suggest the community of predatory arthropods in weed habitat might be one of the main species pools for reestablishment of the community of in rice field.