摘要
在人工草地上,分别测定了威提特东非狼尾草、纳罗克非洲狗尾草、海法白三叶的茎叶、枯落物及根系生物量,同时测定了三种草茎叶、枯落物持水保水能力;并以祼地和耕地为对照,以土壤容重、孔隙度、有机质为指标对三种牧草的土壤改良能力进行了评价。结果表明:非洲狗尾草茎叶生物量(干重)为11.92t/hm2,显著高于东非狼尾草及海法白三叶,东非狼尾草为9.66t/hm2,显著高于海法白三叶(7.35t/hm2)。根系生物量,非洲狗尾草与东非狼尾草差异不显著,但显著高于白三叶;茎叶最大持水量,非洲狗尾草显著高于东非狼尾草及白三叶,东非狼尾草显著高于白三叶;茎叶生物量亦同。枯落物量,非洲狗尾草为5.85 t/hm2,显著高于东非狼尾草及白三叶。非洲狗尾草枯落物对水分的有效截留量为18.26t/hm2,显著高于东非狼尾草及白三叶,东非狼尾草及白三叶之间无显著差异。从土壤容重、总孔隙度和土壤有机质测定结果可知,草地土壤结构较为稳定,种植牧草后土壤肥力得到显著改善。
Biomass of stems and leaves, litter of Kikuyu grass （Pennisetum clandestinum cv. Whittet） ,Setaria grass （Setaria sphacelata cv. Narok） and white clover （Trifolium repens cv. Haifa） were determined. The water holding capacity of stems and leaves, litter of 3 grasses were determined as well. Soil bulk density, soil porosity and soil organic matter of 3 grass lands were also determined to evaluate the soil improvement ability of 3 forage species. The results showed that the biomass of stems and leaves of Setaria grass was 11.92 t/hm^2. It was significantly higher compared with Kikuyu grass （9.66t/hm^2） and white clover （7.35t/hm^2）. There were no significant difference between Setaria grass and Kikuyu grass in root biomass, but the root biomass of these 2 grasses were higher significantly compared with white clover. Maximal water holding content of stems and leaves of Setaria grass was 44.28t/hm^2 , no significant difference compared with Kikuyu grass, however, these 2 grasses were significantly higher than white clover in maximal water holding content. Litter weight of Setaria grass was 5. 85t/hm^2, which was significantly higher than other 2 grasses. Effective interception content of litter of Setaria grass was 18.26t/hm^2 , which was significantly higher than other 2 grasses. The analysis results of soil bulk density, soil porosity and soil organic matter showed that the structure and fertility of grasslands soil were better than cropland and bare land. It mean that pasture establishment not only provided forage for animals, but also improved soil structure and fertility. Grassland had good function of water conservation as well.
出处
《中国草地学报》
CSCD
2008年第1期66-71,共6页
Chinese Journal of Grassland
基金
云南自然科学基金项目(2004C0063M)
关键词
生物量
土壤改良
保水能力
枯落物
Biomass
Soil improvement
Water conservation
Litter of grass
