不同微生境下科尔沁沙地苜蓿的生产性能

Production performance of alfalfa in sandy land in Horqin under uifferent microhabitats

在科尔沁沙地,通过对洼地、坡地、岗地等3个不同生境条件下测定二龄苜蓿的产量及生长特性,分析了微环境对沙地苜蓿生产性能的影响。结果表明:洼地年干草产量最大,达14 173.47kg/hm2,显著高于坡地和岗地生境苜蓿产量;岗地条件下苜蓿干草产量最低,达7 415.58kg/hm2。苜蓿干草产量与苜蓿株高呈显著正相关关系(P<0.05);苜蓿根系生长受不同生境影响较大,岗地苜蓿根系长势明显低于洼地苜蓿和坡地苜蓿,苜蓿根体积、根颈粗度和根干重都相对较小,分别是250.3cm3,3.58mm和82.4g。洼地苜蓿根体积、根颈粗度和根干重均最大,分别是443.8cm3,4.44mm和146.2g。洼地每株苜蓿根瘤菌数显著多于坡地和岗地,达到16.7个/株。

The influence of microenvironment on the production performance of alfalfa grown in different habitats（depression,slope and hillock）was studied in Horqin in 2015through measuring the yield and growth characteristics of alfalfa.The results showed that annual hay yield of alfalfa grown in depression habitat reached 14 173.47kg/ha,significantly higher than that in slope and hillock habitats（P〈0.01）.In hillock habitat,the hay yield was the lowest,but also reached 7 415.58kg/ha.Alfalfa hay yield showed a significant positive correlation with alfalfa height.The root growth of alfalfa was greatly affected by different habitats.In this study,the root growth in hillock habitat was significantly lower than that in depression and slope habitats.The root volume,root neck roughness and root dry weight in hillock habitat were 250.3cm3,3.58mm and 82.4g respectively.The root volume,root dry weight and root neck roughness in depression habitat were the largest,which were 443.8cm^3,4.44mm and 146.2g respectively.The average nodule number per plant in depression habitat （16.7per plant）was significantly higher than those in slope and hillock habitats.