摘要
对我国中亚热带中高山地区人工草地主要建植类型黑麦草Loliumperenne群落的主要植物种进行不同管理压力和干扰条件下的种间竞争研究。采用封闭型环境因子梯度试验设计 ,运用deWit的RCC模型评价牧草之间的竞争力 ,同时应用草地管理指数对各管理因子进行数量标准化 ,并分析牧草种间竞争与管理指数的关系。研究表明 :数量化管理指数是对草地管理因子标准化研究的有效方法 ,其中刈割次数、施肥和灌溉为草地管理的主导因子 ;黑麦草与其他种的竞争特征表现出黑麦草的竞争能力明显弱于白三叶Trifoliumrepens,但强于绣线菊Spiraeajaponicavar nepalensis ,芒Miscanthussinensis ,白茅Imperatacylindrical和地榆San guisorbaofficinlis,而黑麦草与鸭茅Dactylisglomerata之间的竞争相对平衡 ;黑麦草与其他种的竞争强度随管理指数的提高而增强 ,其中黑麦草 -白三叶的竞争指数随管理指数的变化明显呈“∩型”趋势 ,而黑麦草与绣线菊、芒、白茅、地榆、鸭茅的种间竞争指数随管理指数变化呈明显的正相关“线型”变化趋势。
The interspecific competition among the main species w ithin ryegrass communities (the main cultivated pasture type of the area) in the middle subtropical mid-alp of China was studied under different management str ess and disturbance conditions. In the course of the study, a gradational exper imental design was used involving closed-type environmental factors. De Wit's relative competitive coefficient model was used to evaluate competitive strength between various pasture species. At the same time, some management indexes of pasture were taken to quantitatively standardize each management factor, and the relationship between the interspecific competition and management indexes was a nalyzed. The research indicated that quantification management indexes are a us eful method for study on standardization of pasture management factors. Cutting frequency, fertilization and irrigation were the dominant factors. The competi tion between ryegrass and other species indicated that the competitive ability o f ryegrass was evidently weaker than Trifolium repens, but stronger than S piraea japonica var. nepalensis, Miscanthus sinensis, Imperata cylindrical and Sanguisorba officinalis, and that it was in relative balance with D actylis glomerata. The competitive intensity between ryegrass and other speci es increased with the increasing of management indexes. The competitive coeffic ient between ryegrass and Trifolium repens showed change with change in manageme nt indexes, showing a distinct “∩” trend, and that between ryegrass and each of the other five species, without exception, was evidently positively linearly correlated.
出处
《草业科学》
CAS
CSCD
2004年第5期30-37,共8页
Pratacultural Science
基金
国家自然科学基金项目 (3 9770 14 2 )
中国科学院地理科学与资源研究所创新领域项目 (CX10G E0 1 0 2 0 5 )
关键词
黑麦草
种间竞争
草地
管理指数
相对竞争系数
ryegrass
interspecific competition
relative competi tive coefficient
management index
