宜宾市油樟资源空间分布特征及地形对油樟栽植的影响

Spatial Characteristics of Cinnamomum Ionge-paiculatum in Yibin and the Influence of Topography

为了查清宜宾市油樟资源的空间分布、分析影响油樟发展的地形因素、提供油樟种植的基础资料,采用遥感影像判读与实地调查相结合的方法,对宜宾市境内面积大于350 m2且以油樟为优势树种的林地进行了调查和统计.结果表明:截止2012年底宜宾市共有油樟林26 059.85 hm2,其中宜宾县的占66.4%,翠屏区的占33.6%,主要分布在46个乡镇,形成了以隆兴-古柏和宗场-思坡为中心的两个核心区;现有油樟以幼龄林为主,主要分布在坡度较小、光照较充足的山坡上,斑块面积普遍偏小,破碎化较严重,难以形成完整的油樟林生态系统.各个林龄段的比重和空间分布特征,显示油樟近几年由传统种植区快速向外扩张,说明油樟产业正受到越来越多的重视.

Cinnamomum Ionge-paiculatum planting is one of the major industries in Yibin. To identify the Cinnamomum Ionge-paiculatum spatial characteristics and the influence of topography, forest land patches more than 350 m^2 and domi-nated by Cinnamomum Ionge-paiculatum were statistically analyzed on the basis of establishing systemic key of remotesensing interpretation and field survey. The results show that there are 26 059.85 hm^2 dominated by Cinnamomum Iongepaiculatum found in 46 townships in Yibin by the end of 2012, among which 66.4% are in Yibin County and 33.6% inCuiping County. Most of the forest lands are distributed in hillside with enough sun irradiation and with a falling gradientwithin the range of 0 and 35 degrees. Severe fragmentation indicts that it is difficult to form full-scale ecosystem of Cinnamomum Ionge-paiculatum. The ratio of different stand age and spatial characteristics show significantly that Cinnamomum Ionge-paiculatum forest are spreading outside the traditional center of Longxing-Gubai and Zongchang-Sipo, whichmeans more attentions are paid to Cinnamomum Ionge-paiculatum industry.