论文部分内容阅读
对多年生黑麦草(Lolium perenneL.)、草地早熟禾(PoapratensisL.)和苇状羊茅(Festuca arundinaceaSchreb.)3种冷地型草坪草在30%50%田间持水量(FC)、50%70%FC、70%90%FC三个水分梯度下的地下生物量进行了田间测定。结果表明,土壤水分状况直接影响草坪草根系的生长与构形分布。不同水分处理下,3种草坪草的73.4%￣92.2%的根量分布在0￣10cm的土层中,5.1%16.8%的根量分布在10￣20cm的土层中,1.7%9.8%的根量分布在20￣30cm的土层中。水分梯度对根系的垂直空间分布有很大影响,在30%￣50%FC处理下,0￣10cm层根量占0￣30cm总根量的73.4%￣89.5%;50%￣70%FC处理下,0￣10cm层根量占79.5%￣91.6%;70%￣90%FC处理下,0￣10cm层根量占78.3%￣92.2%。10￣20cm、20￣30cm层根量比例随水分梯度的增加则逐渐减小。在30%50%FC、50%70%FC、70%90%FC3个水分梯度下,3种草坪草8,9,10三个月根量累积值(g/m2)依次为,多年生黑麦草:4209.5、3416.5、3906.5;草地早熟禾:3716.6、3452.9、3447.8;苇状羊茅:5281.0、5184.5、4317.7,苇状羊茅根量最大,草地早熟禾根量最小。
The water holding capacity (FC), 50% (70%) and 50% of the three cold-season turfgrasses of Lolium perenne L., Poapratensis L. and Festuca arundinacea Schreb. FC, 70% 90% FC three moisture gradient underground biomass were measured in the field. The results showed that the soil moisture status directly affected the growth and configuration distribution of turf grasses. Under different water treatments, 73.4% ~ 92.2% of the three kinds of turfgrass were distributed in the soil layer of 0 ~ 10cm, 5.1% 16.8% of the root distribution in 10 ~ 20cm soil layer, 1.7% 9.8% Roots are distributed in 20 ~ 30cm soil layer. The effect of water gradient on the vertical spatial distribution of root system is very significant. Under the condition of 30% ~ 50% FC treatment, 0 ~ 10cm layers account for 73.4% ~ 89.5% of the total root mass of 0 ~ 30cm; 50% ~70% FC treatment , 0 ~ 10cm layers accounted for 79.5% ~ 91.6%; 70% ~ 90% FC treatment, 0 ~ 10cm layer of roots accounted for 78.3% ~ 92.2%. The proportion of stratum of 10 ~ 20cm and 20 ~ 30cm gradually decreased with the increase of water gradient. Under the three kinds of water gradients of 30% 50% FC, 50% 70% FC and 70% 90% FC, the three-month root mean aggregates (g / m2) : 4209.5,3416.5,3906.5; Kentucky bluegrass: 3716.6,3452.9,3447.8; Tall fescue: 5281.0,5184.5,4317.7, the largest amount of Fescue fescue, Kentucky bluegrass the smallest amount.