Biomass and carbon storage of natural forest has been studied in China. However, the study about it in the zone of karst and the urban was fewer. Guiyang is in the center of Guizhou provience, which has a broad distribution of karst At the same time, forest coverage in Guiyang topped the list in the provincial capital. The biomassa and carbon storage in mixed stand of the locust and the catalpa were investigated by the sample plot method. The results show that mean biomasses of an individual tree of the two species were respectively 58. 819 kg and 43. 966 kg. And the branch biomasses of the two species were respectively 31. 511 kg and 18. 504 kg, which accounted for 53. 57% and 42. 09% in the biomass of an individual tree. The stem accounted for the largest proportion, and the findings show that the stem was the major organ of accumulating the biomass of the tree. In the mixed forest, the biomass of the locust was 33. 350 t · hm-2, and that of the catalpa was 50. 297 t · hm-2, and the former was 1. 6 times bigger than the latter. The carbon content rate in the two different species was between 48. 25% and 59. 13%. The carbon rate of the truck of the two species was the biggest The carbon content of the vegetation in the mixed forest was 51. 384 t · hm-2. The results can provide the basis for the estimates of estimating urban forest carbon sink.%采用样地调查与标准木收获法,研究了贵州贵阳市城市刺槐+梓木混交林生物量与碳储量.结果表明:刺槐的单株生物量为58.819kg,其中树干为31.511kg,占整株生物量的53.57％；梓木单株生物量为43.966kg,树干为18.504kg,占整株生物量的42.09％；混交林中刺槐的生物量为33.350 t·hm-2,梓木的生物量为50.297 t·hm-2,梓木生物量是刺槐的1.6倍；刺槐和梓木2个树种各器官含碳率在48.25％～59.13％之间,且均以树干的含碳率最高；刺槐梓木混交林中,林分植被的碳储量为51.384 t·hm-2.研究结果可为城市森林碳汇功能估算提供依据.
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