为了解野生早樱(Cerasus subhirtella var. ascendens)的群落特征,根据吴征镒科属区系分析方法,对武夷山和宝华山野生早樱群落植物区系进行了研究。结果表明,野生早樱群落共有种子植物261种,隶属于64科、144属,其中以寡属种居多,物种分...为了解野生早樱(Cerasus subhirtella var. ascendens)的群落特征,根据吴征镒科属区系分析方法,对武夷山和宝华山野生早樱群落植物区系进行了研究。结果表明,野生早樱群落共有种子植物261种,隶属于64科、144属,其中以寡属种居多,物种分布不均匀。区系特征上,从科的区系成分来看,两地3个群落植物区系热带性强于温带性分布类型;从属的区系成分来看,武夷山野生早樱群落植物区系热带性分布和温带性分布类型基本持平,而宝华山温带性分布类型要明显强于热带性分布。该群落区系T/R值随着纬度的增加而增大,但海拔高度的影响不明显。该群落植物区系起源古老,保留有大量的原始植物,具有明显的热带向温带过渡的特征。展开更多
Coastal erosion is currently a major problem along the southern coast of Chongming Island, Shanghai. To enhance the erosion protection ability of coastal shelterbelts, two woody tree species, Taxodium ascendens and Sa...Coastal erosion is currently a major problem along the southern coast of Chongming Island, Shanghai. To enhance the erosion protection ability of coastal shelterbelts, two woody tree species, Taxodium ascendens and Salix babylonica, were planted separately into Phragmites australis ＋ Scirpus mariqueter communities in 2006. Two years later, we investigated whether either of these experiments reduced erosion and increased stability in the native herbaceous plant community. We also examined soil stability and root length density under T. aseendens added, S. babylonica added and native herbaceous vegetation conditions along an intertidal gradient from the soil surface to a depth of 40 cm in each experiment, thus to determine the capacity of T. ascendens and S. babylonica to contribute to shoreline stabilization. Topsoil under the native vegetation had greater stability at the middle and higher intertidal zones because its soil stability index and root length density were significantly higher than in the T. ascendens or S. babylonica planted communities. The effect of T. ascendens on soil stability was not generally better than that of the native vegetation. Only at the 20-30 cm soil depth of the middle intertidal zone and in the 10-20 cm layer of the higher intertidal zone the soil stability index and root length densities under the T. ascendens added condition were significantly higher （P 〈 0.05） than those of the native vegetation. The S. babylonica planted soil had greater stability in the deeper soil layer than the soil under either the native vegetation or the T. ascendens added condition, and its soil stability index and root length density were significant higher （P 〈 0.05） than those of other vegetation conditions at the 30 40 cm soil depth for the lower intertidal zone and at the 20-40 cm layer for middle and higher intertidal zones.展开更多
文摘为了解野生早樱(Cerasus subhirtella var. ascendens)的群落特征,根据吴征镒科属区系分析方法,对武夷山和宝华山野生早樱群落植物区系进行了研究。结果表明,野生早樱群落共有种子植物261种,隶属于64科、144属,其中以寡属种居多,物种分布不均匀。区系特征上,从科的区系成分来看,两地3个群落植物区系热带性强于温带性分布类型;从属的区系成分来看,武夷山野生早樱群落植物区系热带性分布和温带性分布类型基本持平,而宝华山温带性分布类型要明显强于热带性分布。该群落区系T/R值随着纬度的增加而增大,但海拔高度的影响不明显。该群落植物区系起源古老,保留有大量的原始植物,具有明显的热带向温带过渡的特征。
基金Supported by the National Key Technologies Research and Development Program of China during the 11th Five-Year Plan Period (No. 2006BAC01A14)the Key Project of the Science and Technology Commission of ShanghaiMunicipality,China (Nos. 10dz1200602 and 10dz1200902)
文摘Coastal erosion is currently a major problem along the southern coast of Chongming Island, Shanghai. To enhance the erosion protection ability of coastal shelterbelts, two woody tree species, Taxodium ascendens and Salix babylonica, were planted separately into Phragmites australis ＋ Scirpus mariqueter communities in 2006. Two years later, we investigated whether either of these experiments reduced erosion and increased stability in the native herbaceous plant community. We also examined soil stability and root length density under T. aseendens added, S. babylonica added and native herbaceous vegetation conditions along an intertidal gradient from the soil surface to a depth of 40 cm in each experiment, thus to determine the capacity of T. ascendens and S. babylonica to contribute to shoreline stabilization. Topsoil under the native vegetation had greater stability at the middle and higher intertidal zones because its soil stability index and root length density were significantly higher than in the T. ascendens or S. babylonica planted communities. The effect of T. ascendens on soil stability was not generally better than that of the native vegetation. Only at the 20-30 cm soil depth of the middle intertidal zone and in the 10-20 cm layer of the higher intertidal zone the soil stability index and root length densities under the T. ascendens added condition were significantly higher （P 〈 0.05） than those of the native vegetation. The S. babylonica planted soil had greater stability in the deeper soil layer than the soil under either the native vegetation or the T. ascendens added condition, and its soil stability index and root length density were significant higher （P 〈 0.05） than those of other vegetation conditions at the 30 40 cm soil depth for the lower intertidal zone and at the 20-40 cm layer for middle and higher intertidal zones.
