不同种植年限的巨菌草对植物和昆虫多样性的影响

Effects of different years of planting Pennisetum sp.on the plant-and insect diversity in Pennisetum sp.communities

以未种植巨菌草的荒山坡地为对照(CK),研究种植年限为1、2、3年的巨菌草群落的植物和昆虫多样性.结果表明:种植巨菌草的植物群落物种丰富度比CK低,但盖度比CK高,种植3年的盖度最高为91.6%,比CK高75.8%;种植3、2、1年的巨菌草群落昆虫物种丰富度分别为CK的5.6、5.3和3.6倍;不同种植年限巨菌草群落植物和昆虫的Simpson、Shan-non、均匀度、Brillouin、McIntosh等指数均显著高于CK,说明种植巨菌草可明显影响群落的植物和昆虫多样性;群落的植物和昆虫多样性随种植年限的增长逐渐趋于稳定.

This paper studied the effects of 1-,2-and 3 years of planting Pennisetum sp.on the plant-and insect diversity in the Pennisetum sp.communities,taking the barren mountain land without planting Pennisetum sp.as the control （CK）.Compared with CK,the plant species richness in Pennisetum sp.communities with different years of planting was lower,but the coverage was higher.The coverage in the Pennisetum sp.community having been planted for 3 years was the highest,up to 91.6%,and 75.8% higher than the CK.The insect species richness in the Pennisetum sp.communities having been planted for 1,2 and 3 years was 3.6,5.3 and 5.6 times of the CK,respectively.The plant-and insect diversity indices,including Simpson index,Shannon index,evenness,Brillouin index,and McIntosh index for the Pennisetum sp.communities with different years of planting were significantly higher than the CK,which indicated that the growth of Pennisetum sp.could affect the plant-and insect diversity.With the increasing year of planting,the plant-and insect diversity in Pennisetum sp.communities tended to be stable.