摘要
苦豆子是一种典型的防风固沙先锋植物,其生长分布呈典型的斑块化格局。于2017年6月至9月在宁夏灵武市宁东镇刘家寨地区选取了LJZ2017A(01—08斑块)和LJZ2017B(01—06斑块)两个样地共14个苦豆子植物斑块,调查了各斑块内苦豆子种子害虫(豆荚螟)的种群数量及其危害率。结果表明:在LJZ2017A样地斑块面积平均为1457.79m^2,种子害虫数量平均为0.69只每荚,密度为0.65只·m^(-2);在LJZ2017B样地斑块面积平均为949.87m^2,种子害虫数量平均1.46只每荚,密度为1.30只·m^(-2)。种子害虫对豆粒的危害率在LJZ2017B样地为49.91%,明显高于LJZ2017A样地的24.50%。种子害虫密度与斑块面积的逐步回归分析显示随着斑块面积的增大而呈显著下降趋势(F=16.58,P=0.0015, R=0.7617),对豆粒的危害率随着生境破碎化程度增加呈增加趋势(F=7.45, P=0.0183, R=0.6189)。
Sophora alopecuroides mainly distributes in the desert regions of Northwest China as a highly adversity-resistant perennial officinal plant.It is a windbreak and fixation sand pioneer plant.A total of 14 patches of Sophora alopecuroides from LJZ2017A(01-08 patches)and LJZ2017B(01-06 patches)were selected.Etiella zinckenella was seed pest of Sophora alopecuroides.The damage rate,density and individual of Etiella zinckenella were investigated from June to September 2017 in Liujiazhai region of Ningdong Town,Lingwu City,Ningxia.The results showed that in LJZ2017A plot,the average area of patches was 1457.79 m^2,the average number of seed pests per pod was 0.69,and the average density was 0.65 individual per square meter.In LJZ2017B plot,the average area of patches was 949.87 m^2,the average number of seed pests per pod was 1.46,and the average density was 1.30 individual per square meter.The seed damage rate was 49.91%in LJZ2017B plot,which was significantly higher than 24.50%in LJZ2017A plot.The stepwise regression analysis of seed pest density and patch area showed that the density of seed pests decreased significantly with increasing patch area(F=16.58,P=0.0015,R=0.7617),and the seed damage rate increased with increasing degree of habitat fragmentation(F=7.45,P=0.0183,R=0.6189).
作者
张大治
张圣昕
马志芳
吴光胜
ZHANG Dazhi;ZHANG Shengxin;MA Zhifang;WU Guangsheng(School of Life Science,Ningxia University,Yinchuan 750021,China)
出处
《生态科学》
CSCD
2019年第2期31-35,共5页
Ecological Science
基金
国家自然科学基金项目(31560611
31860619)
关键词
苦豆子
生境破碎化
豆荚螟
危害率
斑块面积
Sophora alopecuroides
habitat fragmentation
Etiella zinckenella
damage rate
patch area
