摘要
针对沂蒙山区的经济林和生态林,布设了399个2 m×2 m灌草样方,选取了48个林下优势种建立2×2联列表,应用方差分析、χ2统计检验、Ochiai指数和Jaccard指数,分别对经济林和生态林封禁过程中林下灌草层物种的总体相关性、关联强度进行了定量测定研究。结果表明:林下灌草物种总体表现为显著的正相关性;经χ2检验,呈正关联和负关联的种对数分别为635对和489对,无关联的种对数为4对,说明鲁中南山地丘陵区林下灌草层植被经过长期的演替,一些物种间具有了一定的联结性,但仍处在发展演替之中。Ochiai指数和Jaccard指数检测结果显示,关联度小的种对占到了大部分,正关联的种对要远大与负关联的种对,与总体关联性一致。经济林和生态林在不同封禁阶段林下灌草层种间关联性表现不尽相同,经济林趋于正关联,而生态林趋于负关联。
Toward the fruit forest and ecological forest in Yimeng mountain area of Shandong province,sampling 399 shrub-herb plots occupying 4 m2,selecting 48 species and constructing 2×2 contingency tables of species presence or absence data,using difference analysis method,χ2 test,series technologies such as Ochiai index and Jaccard index,the overall association and interspecific relation degree of understory vegetation species of shrub and herb were studied during forsook recovery.The results showed that,the overall interspecific relation was significant positive correlation.By χ2 test,there were 635 species-pairs of positive correlation,489 negative correlation respectively,and 4 non-correlation species-pairs in all species of shrub and herb layer in mountain area of middle-southern Shandong province.After long-term succession,correlation in some species appeared in understory shrub-herb layer,but the understory vegetation was in the period of positive succession.The results of Ochiai index and Jaccard index showed that,the species-pair of small correlation degree was major,and the species-pair of positive correlation was much more than that of negative correlation.This order was the same with overall correlation.Farther more,the interspecific relations of economic forest and ecological forest appeared difference in forsook recovery.The interspecific relation of shrub and herb in fruit forest tended to be positive,while ecological forest negative.
出处
《山东农业大学学报（自然科学版）》
CSCD
北大核心
2010年第2期196-204,共9页
Journal of Shandong Agricultural University：Natural Science Edition
基金
水利部淮河水利委员会专项基金"淮河流域沂蒙山区植被演替规律与生态修复对策研究"
水利部
财政部"淮河流域水土保持生态修复机理与评价指标体系研究"
关键词
种间联结
林下植被
封禁管护
经济林和生态林
沂蒙山区
Intersepecific relation
understory vegetation
forsook recovery
fruit forest and ecological forest
Yimeng mountain area
