桉树+草珊瑚复合经营模式研究及其经济效益分析

为提高桉树人工林地的土地利用率，有效改善生态环境，项目在桂中平原低丘和高丘陵区两种立地条件下，采用随机区组试验设计方法，研究了桉树+草珊瑚两种复合经营模式、3种栽培模式下产量及其经济效益。结果表明：(1)桉树林下培育草珊瑚苗木复合经营比对照桉树纯林增值456623.73元·hm-2，增值率422.67%。(2)桉树人工林下套种草珊瑚的桉1+草1、桉1+草2、桉1+草3等复合经营模式分别比对照桉树纯林增值?1041.89元·hm-2、18934.23元·hm-2、20212.27元·hm-2，增值率分别是?3.95%、71.88%和76.73%，以桉1+草3复合经营模式经济效益最好。(3)桉树林下套种的草珊瑚生长5个月、16个月和25个月比对照桉树纯林分别增值2264.14元·hm-2、15823.69元·hm-2和42334.03元·hm-2，增值率分别是8.73%、49.64%和115.45%。研究结果表明，对于萌芽力强的多年生植物草珊瑚而言，随着生长时间延长，草珊瑚的分蘖数量和生物量增加，经济效益更好。

Study of Eucalypt-Sarcandra glabra Intercropping and Analysis of Its Economic Benefits

For increasing the global utility of eucalypt plantations and improving the environment, this study was initiated to examine the potential for intercropping of Sarcandra glabra within Eucalyptus plantations. Two eucalypt-S. glabra intercropping patterns and three planting patterns were studied in randomized complete block experiments on a lower hillside site and an upper hillside site in central Guangxi; data collected was used to analyze economic benefits of such intercropping systems. Intercropping systems of eucalypt-S. glabra increased the economic returned by up to 456 624 RMB·hm-2, compared to pure Eucalyptus plantations, providing a 423% higher return. For an intercropping patterns of 1-line eucalypt +1-row S. glabra, 1-line eucalypt + 2-rows S. glabra, 1-line eucalypt + 3-rows S. glabra compared to pure eucalypt plantation the output value increase by ?1 042 RMB·hm-2, 18 934 RMB·hm-2 and 20 212 RMB·hm-2, providing increases of ?3.9%, 71.9% and 76.7% respectively. This showed that the cultivation mode involving 1-line eucalypt + 3-rows S. glabra provided the highest economic benefit. The average returns from the three cultivation modes increased with time, and at 5 months, 16 months, 25 months average output values increase by 2 264 RMB·hm-2, 15 824 RMB·hm-2, 42 334 RMB·hm-2 respectively compared to pure eucalypt plantation, providing increases of 8.7%, 49.6%, and 115.5% respectively. This showed that the highest economic benefit was by continuing the intercropping for 25 months.