广西杉木人工林生产力地理分布规律及模型的研究

Study on Productivity Geogrphical Distribution Law and Model in Cunninghamia Lanceolata Plantation in Guangxi Province

本文是广西森林生态系统研究工作的一部分,对广西杉木人工林生产力的地理分布规律进行了长期(1979—1992)的研究。结果表明,在水平地带上,杉木林生产力呈现出自北向南、自东向西逐步递减的规律性变化。大体上每往南推进一个纬度生产力降低2t/ha·a左右;每西进一个经度生产力降低0.5—lt/ha·a。杉木林生产力的垂直变化错综复杂,因地理区域和山体大小的不同而发生明显的变化。但是,高产区的垂直高度范围是由东向西逐步抬升的。文中还建立了杉木林生产力地理空间分布的数学模型。本研究结果为广西杉木人工林的生产布局和营林提供了科学依据。

This paper deals with a part of research on the forest ecotystems in Guangxi and relates to productjvity geographical distribution law in Chinense fir (Cunninghamia lanceolata) plantation. The results show that the productivity in Cunninghamia lanceolata plantation is a reg- ularity change to reduce from north to south and from east to west, on the level zone. In the gen- eral, the productivity reduce about 2 t/ha a every goes one latitude degree towards the south and reduce 0.5--1 t/ha a every goes one longitude degree towards the west. The vertical change of productivity in Chinese fir is more complex, that vary with geographical region and mountain size. But, the altitude high range of the high yield region in Chinese fir is showing a tendency to rise gradually, from east to west: And mathematical model of the productivity geog- raphy--space distribution in Chinense fir plantation were derived as: Pb=-56.8472+20.4085 lnN+1.04029(E-110)~2-9.8332l.l0(-6)(A-3l4)~2 (in east ) Pb=1.01117+0.0249603 N^2+0.02l2392(E-105)~2-1.40304.l0-5(A- l080)~2 (in west)