喜旱莲子草的营养累积及对莲草直胸跳甲化蛹能力的影响

Effects of nutritional ingredients of Alternanthera Philoxeroides on pupation rate of Agasicles hygrophila

本研究测定了3种不同生态型喜旱莲子草(Alternanthera philoxeroides)的营养成分,并就各成分对莲草直胸跳甲化蛹率进行了相关性分析。结果表明:3种不同生境中的喜旱莲子草茎杆的水分、粗纤维、蛋白质和粗脂肪的含量有显著差异,水生型、湿生型和旱生型的水分含量分别为93.28%、89.16%和87.07%;粗纤维、蛋白质、粗脂肪含量均是旱生型>湿生型>水生型,纤维含量分别为4.18%、3.99%和2.46%,蛋白含量分别为0.41%、0.35%和0.25%,粗脂肪含量分别为0.088 3%、0.014 2%和0.003 9%。莲草直胸跳甲在水生型、湿生型和旱生型喜旱莲子草上的化蛹率差异极显著:水生型最高为89.00%;湿生型居中为64.67%;旱生型最低为16.43%。喜旱莲子草营养累积对莲草直胸跳甲化蛹率的影响表明:化蛹率与水分含量呈极显著正相关,而与粗纤维、蛋白质和粗脂肪呈显著负相关。逐步回归分析表明粗脂肪和粗纤维是影响化蛹率最重要的因子。

Agasicles hygrophila can obviously reduce the damages caused by Alternanthera philoxeroides.In this paper,nutritional ingredients of A.philoxeroides were measured and correlation of nutritional ingredients with the pupation rate of A.hygrophila was analyzed.The results showed that hydrophytes,hygrophytes and xerophytes had different water contents,93.285%,89.16% and 87.07% respectively.The contents of rough fiber,protein and rough fat were in an order of xerophytes〉hydrophytes〉hydrophytes.Rough fiber content was 4.18%,3.99% and 2.46%,protein 0.41%,0.35% and 0.25%,rough fat 0.088 3%,0.014 2% and 0.0039% respectively.The pupation rates of A.hygrophila were also significantly different,89.00%,64.67% and 16.43% in hydrophytes,hygrophytes and xerophytes respectively.The pupation rate was positively correlated with water content,but negatively with the percentage of rough fibre,protein and rough fat.A stepwise regression model was established for these parameters：Y=119.477-11.463X2-624.440X4（r2=0.987）,X2 rough fibre,X4 rough fat.It is concluded that the pupation rate was primarily affected by rough fat and rough fibre.