荒漠草地四种灌木单株生物量估测方法

研究了砾石荒漠草地下松叶猪毛菜，合头草，中亚木紫菀，和琵琶柴的形体特征与产量的关系，建立了估算四种灌木生物量的回归公式：松叶猪毛菜：ｙ＝－５３．２６２６＋２．３５５Ｘ１＋０．９０６２Ｘ２＋０．５６０６Ｘ３，合头草：ｙ＝－１７．８２２８＋０．９２２６Ｘ１＋０．３９６５Ｘ２＋１．０５３１Ｘ３，中亚木紫菀：ｙ＝－１７．２３５６＋０．７３３９Ｘ１＋０．４０６８Ｘ２＋０．７０３４Ｘ３，琵琶柴：ｙ＝－２１．３     

Separation of two leafhopper populations of theCirculifer haematoceps complex on different host plants in Israel

TwoCirculifer leafhopper populations of thehaematoceps complex have been collected in large numbers in Israel for several years. One of these leafhoppers inhabited prickly saltwort (Salsola kali) plants on sandy soil on the Mediterranean coast. It has a narrow host range and was found to survive for one generation on turnip. The other leafhopper population was collected in 1986 on common goosefoot (Chenopodium album) plants in the Golan Heights. This population is polyphagous and in the laboratory reproduced well onMatthiola incana, turnip, sugar beet andChrysanthemum coronarium; however, reproduction was nil onPhaseolus vulgaris and very low onBrassica oleracea, Portulaca oleracea andCarthamus tinctorius. Contribution from the Agricultural Research Organization. No. 2502-E, 1988 series.