论文部分内容阅读
对黄土丘陵沟壑区5种典型草地表层土壤的结构、持水性能及供水能力进行了测定,结果表明:沙打旺群落持水能力最强,其次为百里香群落,再者为长芒草群落和铁杆蒿群落,大针茅群落最低;百里香群落的土壤供水能力最大,大针茅群落最小,沙打旺群落、长芒草群落及铁杆蒿群落次之;土壤失水速度为大针茅群落>铁杆蒿群落>百里香群落>沙打旺群落>长芒草群落。百里香群落草地土壤饱和含水量最高,大针茅群落最低。田间持水量及有效水含量随>0.25mm水稳性团聚体含量增加而提高。饱和导水率为:百里香群落>沙打旺群落>长芒草群落>铁杆蒿群落>大针茅群落,与>0.25mm水稳性团聚体含量成正相关。与大针茅群落等其它草地相比,沙打旺群落和百里香群落土壤条件较好,可促进土壤水分的入渗、保留及供给植被利用,提高该区的水土流失防治速度,促进生态环境的改善。
The soil structure, water holding capacity and water supply capacity of topsoil of five typical grasslands in the hilly and gully regions of the Loess Plateau were determined. The results showed that the water holding ability of the sand community was strongest, followed by the thyme community, Artemisia community and Stipa grandis community were the lowest. Thyme community had the highest water supply capacity, the smallest community of Stipa grandis, the community of Astragalus adsurgens, the community of M. longifolia and the Artemisia ordosica community. The rate of soil water loss was Stipa grandis community> Community> Thyme community> Astragalus adsurgens community> Trunk tree community. Thyme community grassland soil saturated water content is highest, Stipa bungeana community lowest. Field water capacity and effective water content with> 0.25mm water-stable aggregates increased. The saturated hydraulic conductivity was: Thyme community> Systematic community> Scomber japonicum community> Artemisia saccharomyces community> Stipa grandis community, which was positively correlated with> 0.25mm water stable aggregates. Compared with other grassland such as Stipa grandis community, the soil conditions of Astragalus adsurgens community and thyme community are better, which can promote infiltration and retention of soil moisture and utilization of vegetation supply, increase the speed of soil erosion prevention and control and promote the ecological environment improve.