<正>对立地、密度、林龄基本一致的湿地松林分采取不同强度的抚育间伐和修枝试验，确定了湿地松林第]次间伐和修枝年龄为7～8a；林分标准郁闭度达0.85以上时，胸径连年生长量已下降，株数间伐强度以不超过30%为宜。第2次间伐应根据培育目的和经营管理水平确定强度，一般林分间伐强度不超过35%；问伐间隔期为5～6a。以培育大径级建筑用材林的林分，应进行第3次间伐，每公顷保留600～680株为宜。间伐后应进行修枝，修枝强度第1次以树高的1/3为宜，第2次以树高的1/2为宜，间隔期为3～5a，时问以深秋至早春为好。

This article studied on spatial-temporal changes of forest resources in Xixia county, Henan province. By means of IMAGINE software, TM data of 2 years in Xixia county were used for analyzing. Through band combination, image stretching, supervised classification, matrix analysis and recoding, images were ready for GIS analysis and RS image drawing. The result showed that areas of broad-leaf forest and areas of coniferous forest increased from 1998 to 2002, and the increased parts changed from fields and brass lands. It also showed that variables of forests concentrated in low altitude, and in high altitude variables centralized near roads and rivers.