湖南省“一湖四水”流域栎类次生林林分质量时空分异特征  

Spatial and temporal characteristics of stand quality of Quercus secondary forest in Hunan on the valley of“One Lake and Four Rivers”

作　　者：敬阳 肖化顺[1,2] 龙时胜 龚召松 JING Yang;XIAO Huashun;LONG Shisheng;GONG Zhaosong(College of Forestry,Central South University of Forestry&Technology,Changsha 410004,Hunan,China;Key Laboratory for Digital Dongting Lake Basin of Hunan Province,Central South University of Forestry&Technology,Changsha 410004,Hunan,China)

机构地区：[1]中南林业科技大学林学院,湖南长沙410004 [2]中南林业科技大学,数字洞庭湖南省重点实验室,湖南长沙410004

出　　处：《中南林业科技大学学报》2021年第7期88-95,共8页Journal of Central South University of Forestry & Technology

基　　金：国家林业公益性行业科研专项“闽楠、青冈栎次生林提质增量关键技术研究与示范”(201504301);湖南省科技创新平台与人才计划项目(2017TP1022)。

摘　　要：【目的】我国栎类次生林资源丰富,其质量优劣在生态文明建设中举足轻重。研究森林资源质量及其时空分异特征是科学经营、提质增量的关键。【方法】基于湖南省1989—2014年6期国家森林资源连续清查数据,建立了含林分生长潜力、林分结构和立地条件指标的栎类次生林林分质量评价模型,并按等距划分法将其定量评价结果划分为优、良、中、差、劣5个等级;结合湖南省"一湖四水"的流域分布特征,从时间维度和空间维度上,研究分析了25年间各流域栎类次生林林分质量的变化规律,并按质量评价等级提出栎类次生林经营要点。【结果】1989—2014年,湖南省栎类次生林面积增加约56.99万hm^(2);通过林分质量评价模型得出,以流域为单元的栎类次生林林分质量综合得分值域为[0.261~0.483];林分质量时空分布变化表现为:优等栎类次生林分布于湘江流域,其他等级林分各流域均有分布;空间上,湘江流域、沅江流域、澧水流域栎类次生林林分质量相对较好,资江流域、洞庭湖流域栎类次生林林分质量较差;时间上,资江流域的栎类次生林质量等级(差)不变,其它流域栎类次生林质量等级由差发展为中。【结论】25年间,湖南省栎类次生林规模大幅增加,各流域栎类次生林质量仅体现中和差2个等级,林分质量整体较差。从质量等级发展过程来看,林分顺向演替明显,提质潜力大。【Objective】China is rich in Quercus secondary forest resources,and its quality plays an important role in the construction of ecological civilization.Studying the quality and differentiation characteristics of forest resources is the key to scientific management and quality improvement increment.【Method】Based on the national forest inventory data of Hunan Province in the period of 1989-2014,The quality evaluation model of Quercus secondary forest with stand growth potential,stand structure and site condition index was established,according to the method of equidistant division,the quantitative evaluation results are divided into five grades:superiort,good,medium,poor and inferior;Based on the distribution characteristics of"one lake and four rivers"in Hunan Province,the study proposes the changes of forest quality in Quercus secondary forest in different watersheds in the past 25 years from the temporal and spatial dimensions and the management key points of Quercus secondary forest were put forward according to the quality evaluation grade.【Result】From 1989 to 2014,the area of Quercus secondary forest in Hunan province increased by 569900 hm^(2).According to the stand quality evaluation model,the comprehensive score range of Quercus secondary forest quality is[0.261-0.483].The temporal and spatial distribution changes of stand quality are as follows:among the five basins,the superior Quercus secondary forest is distributed in the Xiangjiang river basin,and the other grade forest stands are distributed in all basins;spatially,the quality of Quercus secondary forest stands in Xiangjiang River Basin,Yuanjiang river basin and Lishui river basin is relatively good,while the quality of Quercus secondary forest stands in Zijiang river basin and Dongting lake basin is relatively poor;In time,the quality grade of quercus secondary forest in Zijiang river basin remains the same,while that in other basins is the same The quality grade of Quercus secondary forest developed from poor to medium.【Conclusion】In

关 键 词：林分质量 栎类次生林 时空分异 湖南省 

分 类 号：S792.18[农业科学—林木遗传育种]