四川省麻疯树天然林资源的调查与分析

利用近期卫星遥感图片解译结果并结合实地调查，对四川麻疯树天然资源分布情况及生长特点进行了初步调查。结果表明：（1）四川麻疯树天然林资源总面积为34194hm2，主要沿金沙江、安宁河和雅砻江干流及其支流干热河谷呈窄带状水平分布；垂直分布范围为海拔400m—1800m。主要分布范围为海拔800m—1400m，其占四川天然林麻疯树总面积的84．47％。（2）分布方式以零星分布为主，夹杂有团条状分布、成片少，成片分布面积仅占总面积的22．25％。（3）通过对麻疯树天然林资源权属、地类、起源、面积、立地因子、株数、密度、树高、冠幅、生长状况、结实状况、生境状况、病虫害等情况的调查表明，四川麻疯树天然林资源具有雌雄花比例失调、单株产量差异大、病虫害严重、徒长枝多等一系列特点。（4）在宏观上，麻疯树在四川的适生区域为雅砻江流域的中下游及其支流安宁河流域的中下游及金沙江攀枝花、会理、会东段的部分支流的河谷地带。

Investigation and Analysis of Natural Resources of Jatropha curcas Forest in Sichuan

According to on-the-spot investigation and the interpretation result of the short-term satellite remote sensing picture, a preliminary investigation was made on the distribution situation and the growth characteristics of natural Jatropha curcas forest resources in Sichuan. The results have shown： （ 1 ） the total area of Jatropha curcas resources is 34 193.06 hm2, mainly scattering along the arid valleys of main streams and tributaries of the Yangtze River,the Anning River and the Yalong River, and assuming the narrow belt-shaped level distribution;The vertical distribution ranges from 400 m to 1 800 m above sea level. The main distribution elevation is between 800 m and 1 400 m,occupying 84. 47% of the of Jatropha currcas tree resources in Sichuan. （2） The fragmentary distribution is main, and yet there is grouplike and strip distribution;A large expanse of distribution is few. The central dispersal area only accounts for 22. 25% of the total area. （3）On the basis of the investigations on the kind,the origin,the area,the vertical factor,the number of trees,the density,the tree height,the tree crown,and so on,the results have indicated that these natural resources have such features as imbalance of the female and staminate flowers,too big difference in the production of a single tree,serious pests and so on. （4）The suitable regions of Jatropha curcas trees in Sichuan are the middle and lower reaches of the Yalong River and its tributaries, the middle and lower reaches of the Anning River and the valleys of part tributaries of the Jinsha River in Panzhihua City, Huili County and Huidong County.