荧光物示踪法定量测定水稻-叶蝉-蜘蛛食物链的营养关系

首次采用稀土元素铕荧光物示踪法，对水稻－叶蝉－蜘蛛这一食物链营养关系进行了初步的定量测试，结果表明，所选用的稀土元素铕可以通过该食物链而传递，证明铕用于食物链营养关系定量分析是可行的，早稻孕穗期，晚稻分薛期施铕7d后，其含铕量均表现为叶片＞茎及叶鞘；根据叶蝉取食水稻后测定的含铕量和叶蝉体重的不同进行折算，每100头叶蝉每天可取食水稻0．71－1．13g；根据拟水狼蛛，锥腹肖蛸，食虫沟瘤蛛捕食叶蝉后含铕量计算，每头拟不狼蛛，锥腹肖蛸，食虫沟瘤蛛平均每天捕食叶蝉分别为4．63头，2．81头，1．0头，捕食能力，拟水狼蛛＞锥腹肖蛸＞食虫沟瘤蛛。

Quantitative Measurement of Nutritive Relationship of the Food Chain:Rice plant-leafhoppers-spiders by the Fluorescence Labeling Method

The rice leafhopper is one of the main paddy pest species in China, while the paddy spider is the primary predator of the rice leafhopper. In the past, the degree of damage that suffered as a result of paddy pests and the control manifested by paddy spiders toward pests was generally determined by the qualitative research method, which can hardly accurately reflect the dangerous degree of the pest toward the rice and the controlling ability of the spider toward the pest. This research focuses primarily on t...