| 王会梅,徐炳成,李凤民,贺学礼.黄土丘陵区白羊草和柳枝稷适应性生长的比较[J].干旱地区农业研究,2005,(5):35~40 |
| 黄土丘陵区白羊草和柳枝稷适应性生长的比较 |
| Comparison of growth adaptability of Panicum virgatum L．and Bothriochloa ischaemum L．in Hilly region of Loess plateau |
| |
| DOI：10.7606/j.issn.1000-7601.2005.05.07 |
| 中文关键词: 白羊草 柳枝稷 生长适应性 黄土丘陵区 |
| 英文关键词:Bothriochloa ischaemum L. Panicum virgatum L. growth adaptability Hilly region of Loess Plateau |
| 基金项目: |
|
| 摘要点击次数: 0 |
| 全文下载次数: 0 |
| 中文摘要: |
| 在黄土丘陵区的梯田和坡地两种不同立地上对乡土种白羊草和引进种柳枝稷的生长适应性进行了比较,结果表明:两种牧草在植被土壤水分、地上部和地下部生长均存在明显差异。黄土丘陵区上土壤平均含水量为梯田白羊草(17.95%)>梯田柳枝稷(16.02%)>坡地白羊草(13.82%)>坡地柳枝稷(12.95%)。地上部生物量比较,梯田下白羊草显著高于柳枝稷,坡地柳枝稷显著高于白羊草;但两种牧草的地上部生物量均表现为坡地明显大于梯田。两种牧草的根系主要集中分布在地表0~20cm深度,但总地下生物量比较为梯田柳枝稷>坡地柳枝稷>梯田白羊草>坡地白羊草。同时研究发现梯田白羊草、坡地白羊草、梯田柳枝稷和坡地柳枝稷4种植物群落均表现为地上部生物量均明显大于地下部生物量,根冠比分别为0.1017、0.0463、0.2531和0.1091。相关分析表明,立地条件对白羊草群落有重要影响,柳枝稷在黄土丘陵区存在明显的的植被更新过程。在黄土丘陵区白羊草和柳枝稷的地下生物量与土层深度和土壤水分均存在相关性。从模拟方程发现梯田白羊草、坡地白羊草、梯田柳枝稷和坡地柳枝稷根系能达到的最大理论深度分别为175.24、92.30、82.88、90.55cm。 |
| 英文摘要: |
| Comparison of growth adaptability of native Bothriochloa ischaemum and introduced Panicum virgatum was conducted in hilly region of Loess Plateau. A significant difference was found in soil moisture, aerial and root growth of both pastures, among which there was a decreased order of mean soil moisture as B. ischaemum in terrace(17.95%)> P. virgatum in terrace(16.02%)>B. ischaemum in sloping field(13.82%)>P. virgatum in sloping field(12.95%). In terraces the aerial biomass of B. ischaemum was higher than that of P. virgatum significantly, which was contrast with aerial biomass comparison in sloping field of both. However aerial biomass of both in sloping field was greater than that of terrace. Both pastures distributed their roots in soil of 020 cm mainly. The total root biomass would show a increasing trend from B. ischaemum in sloping field to B. ischaemum in terrace to P. virgatum in sloping field to P. virgatum in terrace. Meanwhile the aerial biomass surpassed the root biomass in four plant communities named as B. ischaemum in terrace, B. ischaemum in sloping field, P. virgatum in terrace and P. virgatum in sloping field with root-top rates of 0.1017, 0.0463, 0.2531 and 0.1091 respectively. From the relationship analysis B. ischaemum community was connected with the hilly habitats significantly. However P. virgatum showed a significant renovation in the hilly level. In both pastures communities significant relationships were built up for root biomass and soil depth, root biomass and soil moisture from which the maximum theory depth of 175.24, 92.30, 82.88, 90.55 cm were discovered respectively in roots length of B. ischaemum in terrace, B. ischaemum in sloping field, P. virgatum in terrace and P. virgatum in sloping field from the model functions. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| | |