日本岩垂草在岩溶山地的生态效益研究

本文首次在岩溶山地生态重建中引进优质草种——日本岩垂草(Lippia nodiflora(L.)Greene),通过对其盖度、根系特征、径流量和抗侵蚀能力的研究,探讨其在岩溶山地的生态效益,寻求修复岩溶地区脆弱生态系统的途径,并为日本岩垂草在岩溶山地种植推广提供依据。试验表明,日本岩垂草对降低地表径流量收效明显,在种植了3个月后,地表径流量已经由110mm下降到42mm,下降了62%;抗侵蚀能力强,在同样的雨强和降雨量情况下,其侵蚀量只是传统耕地的5.60%～5.83%;根系生长速度快,密度大,数量多,种植90d时盖度已达100%。实验证明,日本岩垂草具有优秀的生态修复和生态美化能力,能够有效地改善岩溶地区脆弱的生态状况。

Study on the ecological benefit of Lippia nodiflora (L.)Greene in karst mountain

A high quality Japanese species - Lippia nodiflora(L.)Greene is introduced for the first time to be planted for eco-rehabilitation in karst mountain in the paper. The ecological benefitis discussed in the pa per through studying the coverage, root system characteristics, runoff and erosion resistance, whereby seeking eco-rehabilitation ways for fragile ecosystem and providing scientific basis for planting and popularizing Lippia nodiflora(L.)Greene in karst mountain. The experiments show that the amount of runoff will drop after planting Lippia nodiflora(L.)Greene, and the amount of surface runoff reduces by 62% from110 mm to 42 mm 3 months later. Under same rainfall intensity and capacity, the erosion amount in Lippia nodiflora(L.)Greene land counts to only5.60%~5.83% of that in traditional farming lands, and that the root system grows faster, gets denser and more. After planting90 days, the Lippia nodiflora(L.)Greene has covered100% of the ground surface. The experiments prove that Lippia nodiflora(L.)Greene is good for eco-rehabilitation and can improve efficiently the ecosystem and landscape in karst mountain.