退耕还林后群落演替及其α多样性分析

Research Community Succession and α Species Diversity after Conversion from Cropland into Forest

研究了陕西省安塞县退耕还林后7种植被类型下的植被恢复情况、物种多样性特征以及相应生物量。结果表明,退耕还林工程促进了植被的正向演替;柠条是速生树种,赖草为原初植被的建群种;天然草地是由赖草、狗娃花、铁杆蒿共同组成建群种。灌木树种好于乔木树种,其中沙棘表现最好,多样性指数最大,而山杏多样性较差。在草本层及枯落物层中,柠条表现最为优秀,更有利形成乔木-草本-枯落物复合体,增强截留能力。

The status of the vegetation restoration, species diversity characteristics, and biomass of seven typical vegetations at the Ansai County of Shaanxi Province in China were studied. The results showed that conversion from cropland into forest projects promote positive vegetation succession;Korshinsk peashrub was a fast-growing tree species and Leymua secalinu was the original species of vegetaion. Natural grassland was not a priority species for a single species, but by the Leymus secalinu, Heteropappus altaicus and Artemisia sacrorum for species together. Shrub was better than arbor, Sea-buckthorn was the best one that had the largest diversity index, but the Prunus sibirica L. was not as good as others in the diversity index. In the herb layer and litter layer, Peashrub was the most outstanding, had formation of a more favorable formation of trees-herbal-litter complex, and the ability to enhance retention.