串叶松香草水土保持效益的初步研究

Soil and water conservation benefits by silphium perfoluml plantation

本文对串叶松香草的生长性能及土壤的抗冲性、渗透性、贮水量、土壤肥力变化、水土保持作用进行了初步研究,结果表明:串叶松香草覆盖效果好、生物量大(鲜草产量达225 t/(hm2·a)),根系发达。与对照裸地相比,地表径流减少28.36%-45.64%,泥土冲刷量减少58.15%-76.55%。

The growth of silphium perfoluml and its effects on the improvement of the soils anti-erosion(erosion resistance), permeability, and soil and water conservation are studied. The results show that silphium perfoluml grows quickly within the growth period of 3-4 months; the percentage of vegetation coverage is 82-92 percent, and the amount of roots can reach up to 85.4 percent. Compared with the silphium perfoluml-free bare land, it could decrease the soil bulk density and increase the porosity, thus enhancing the water-holding capacity and increasing the production of fresh grass (225 t/(hm2·a)). The amount of land radial rush and soil loss decrease by 28.36-45.64 percent and 58.15-7655 percent respectively.