新疆天山西部云杉生长量变化及其影响因子分析

【目的】计算新疆天山西部云杉生长量,对云杉生长量影响因子进行相关性分析,为监测云杉生长和研究天山森林生态系统提供参考。【方法】根据1996年天山西部8个林场218个样地5682株云杉的实地测量值推算出天山西部云杉的材积经验式和一元材积表;利用GIS和SPSS软件对利用遥感手段提取的生长量影响因子进行相关性分析。【结果】1996~2006年,天山云杉定期生长量为20.487482m3,1996~2006年定期平均生长量为2.048748m3。生长量影响因子相关性分析表明灰度值中的红光波段、近红外波段、绿光波段与云杉生长量显著相关,其次是海拔、NDVI和坡向,相关性最弱的为蓝光波段、短波红外波段和坡度。【结论】在今后的工作中,可根据影响天山云杉生长量的主导因子,并结合GIS手段动态监测云杉生长状况,从而更好地进行天山云杉的研究保护工作。

Volume increment ln dragon spruce trees in western Tianshan Mountain of Xinjiang and its impact factors

Objective]The present study was aimed to observe the volume increment in dragon spruce trees in western Tianshan Mountain of Xinjiang, and to analyze the correlations between the volume increment and its impact factors in order to monitor its growth and study the forest ecological system of Tianshan Mountain. Method]Empirical volume equation and single entry volume table were worked out using the diameter data of 5682 dragon spruces trees at 218 sample locations belonging to 8 forest farms in 1996. The GIS and SPSS software were used to analyze the correlations between the volume increment and its impact factors. Result]The periodic increment of dragon spruce trees was recorded as 20.487482 m3 from 1996-2006 and its average periodic increment was 2.048748 m3. The volume increment of dragon spruce was found significantly correlated with red band, near-infrared wave band and green band, and found to be followed by elevation, NDVI and slope. The weakest impact factors were found to be blue band, short-infrared wave band and gradient. Conclusion]In future, the growth of dragon spruce trees in Tianshan Mountain may be dynamically monitored according to the dominant factors affecting its volume increment using GIS in order to protect dragon spruce trees better.