摘要
研究了郁闭后杨树林下养鸡对林木生长、土壤肥力的影响及其经济效益。结果表明:在郁闭后的杨树林下套养本地鸡种2年后,杨树胸径、树高和蓄积分别比对照提高6.8%、7.1%和20.6%,6年生杨树蓄积增加14.2 m3/hm2。不同土层土壤的各主要养分含量均有所提高,其中以速效N的含量提高最大,上土层提高186.3%,中土层提高296.5%;其次是上土层的速效P含量提高了50.5%;不同土层土壤有机质、全N、速效K含量均提高11.5%～26.3%不等。在不计林木增产收入、不支付地租的前提下,年均利润达22 237.5元/hm2,纯养殖投资回报率为25.8%;支付1 500元/(hm2.年)的地租成本后,还有20 737.5元/hm2的年均利润,套养2年的总利润为41 475元/hm2。因此,在郁闭的杨树林下养鸡是一种很好的"林禽"模式,适合在洞庭湖区郁闭后杨树林下大面积推广。
The influence of feeding local chicken under canopy poplar on forest growth, soil fertility and economic benefit was re- searched. The results showed that, after feeding local chicken under the canopy poplar for two years, the poplar tree DBH, height and volume were increased by 6. 8% , 7.1% and 20.6% respectively, the stand volume of 6-year-old poplar was increased 14. 2 m3/hm2. The major nutrients of different soil layer were improved, and the available N content of the upper layer and the middle layer were in- creased by 186. 3% and 296.5% respectively, which was the maximum increase, followed by the available P content of the upper layer increased 50.5%. The soil organic matter, total N, available K content of different soil layer were increased by 11.5% - 26.3% range. Excluding income from timber production and rent payment, the annual profit amounted to 22 237.5 yuan/hm2, the pure breed- ing ROI was 25.8%. Including the annual rent cost of 1 500 yuart/hm2 , the annual profit amounted to 20 737.5 yuan/hm2 , raised two years the total profit was 41 475 yuan/hm2. Therefore, feeding chicken under canopy poplar was a good ＂forest-birds＂ mode, it was suitable for canopy poplar in the Dongting Lake in large scale.
出处
《湖南林业科技》
2013年第4期22-24,28,共4页
Hunan Forestry Science & Technology
基金
"十二五"农村领域国家科技计划课题(2011BAD38B07)
关键词
郁闭
杨树
养鸡
效益分析
养分
回报率
canopy
poplar
feeding chickens
benefit analysis
nutrient
rate of return
