Study On Geographic Distribution,Community Character And Biomass Of Sabina Vulgaris Ant. Germplasm Resources

The evergreen decumbent shrub Sabina vulgaris Ant. belongs to Cupressaceae and Sabina Mill.. In this paper the geographic distribution,ecotype,community character,variation and biomass of S.vulgaris in China were investigated by the method of data collecting and field surveying,and the results were described as follows:(1) S.vulgaris exists in Shaanxi province,Inner Mongolia province,Ningxia province,Gansu province,Xinjiang province,Qinghai province,Sichuan province and Xizang province in China.The range of geographical coordinates is N 32°54′～49°10′,E 73°40′～115°44′,and vertical altitude is 800～3600m.The key factors are air temperature and precipitation that restrict S.vulgaris distribution, at the same time; soil plays an important role for the S.vulgaris distribution.(2) There are two kinds of tract ecotypes on S.vulgaris in China, one is sandy ecotype, and the other is mountainous region ecotype. The growth status of S.vulgaris is best in Shenmu county Shaanxi province, and it is worst in Wulan county Qinghai province, furthermore, the growth status is best in sunny slope and is worst on the top of sand hill in sandy ecotype,however, it increased firstly then decreased with the hoist of height above sea level in mountainous region ecotype.(3) The abundance,coverage rate and separate coverage rate of S.vulgaris on S.vulgaris communities are big in Shenmu county Shaanxi province,Helan mountain Ningxia province and Chilian mountain Gansu province,but they are small in Altai and Tianshan mountain Xinjiang province as well as Wulan county Qinghai province,species abundance is rich in mountainous region ecotype,but poor in sandy ecotype.There is a obvious inlay phenomenon about the level configuration of S.vulgaris communities; The vertical configuration usually is divided into shrub stratum and herbage stratum in sandy ecotype, S.vulgaris occupy predominance obviously, its coverage rate reach more than 75%, the arbor stratum appears in mountainous region ecotype, so the community configuration is complex; The phanerophytes is one stratum in growth type configuration, chamaephytes+hemicryptophytes+cryptophytes +therophytes become the other stratum.(4) The analysis results of species diversity on S.vulgaris community in different habitats...