摘要
2009年8月和12月,采用样方调查法,对四川省洪雅县柳杉(Crypotomeria fortunei)和杉木(Cunninghami lanceolata)人工混交林的赤腹松鼠(Callosciurus erythraeus)危害进行了调查和分析.共调查了142个10 m×10 m的样方,采用坐标记录法,记录样方内每株林木的坐标值、树种、胸径、冠幅、株下草本盖度、树冠交叠度、是否邻近林窗及其它非生物生境因子(小路、公路、溪水、悬崖)、受害(2 mo以内,以痕迹开始发黑区分)程度共9个参数,共收集3 560株林木数据.分别采用方差均值法和最近邻体法对受害株在研究区和样方尺度上的空间格局进行分析,并在样方尺度上探究植株受害程度与生境因子的关系.结果显示,在研究区尺度上赤腹松鼠危害呈聚集分布,在样方尺度上则以随机分布为主.植株受害程度与其株下草本盖度呈正相关(P=0.007),与树冠交叠度也呈现出正相关(P=0.029),而与其它因子没有显著性的相关性(P>0.05).因此认为赤腹松鼠对人工林林木的危害在研究区尺度上是与其生活环境需求相关的,如食物资源、隐蔽条件等;在对林木株的危害选择上则是随机的,但林木株受害的程度与其株下的草本盖度和树冠的交叠度呈现出显著的正相关关系.
The damage on Crypotomeria fortunei and Cunninghamai lanceolata planted forest by red-bellied squirrels（Callosciurus erythraeus） in Hongya County,Sichuan,China,was investigated in August and December 2009.142 quadrats of 10 m × 10 m were selected and 3 560 trees were measured.The coordinate recording method was adopted to record the damage level（the damage happened within 2 months）,together with its coordinate,tree species,DBH（Diameter at breast height）,canopy diameter,percentage of grass cover,percentage of canopies overlapped,whether it was near to forest gap and abiotic habitat factors（whether it was near to road,stream and cliff,etc.）.The variance-average method and the nearest neighbor analysis（NNA） were used to analyze the spatial distribution patterns of the damage at the study-site scale and the quadrat scale,respectively,and optimal scaling model was especially used to analyze the relationship between the damage levels and the related habitat factors.The results showed that the spatial distribution pattern of the damage was aggregated at the study-site scale,while mainly random at the quadrat scale.The damage level was positively correlated with the percentage of grass cover（P = 0.007） and the percentage of canopies overlapped（P = 0.029）,while not significantly correlated with the other factors（P0.05）.The results suggested that the damage by red-bellied squirrels at the study-site scale was correlated with their living needs in the environment,such as food resources and shelters,etc.The damage at the quadrat scale,however,showed a random distribution pattern,but the damage level was positively correlated with the percentage of grass cover and the percentage of canopies overlapped.Fig 2,Tab 5,Ref 30
出处
《应用与环境生物学报》
CAS
CSCD
北大核心
2011年第3期407-411,共5页
Chinese Journal of Applied and Environmental Biology
基金
国家科技部"973"项目(No.2007CB109106)资助~~
关键词
赤腹松鼠
人工林
危害
空间格局
red-bellied squirrels
planted forest
damage
spatial distribution pattern
