摘要
【目的】胡杨Populus euphratica林的普遍退化严重威胁着干旱区绿洲的生态安全,因此,摸清胡杨林的健康状况,对胡杨林的可持续经营具有重要意义。【方法】以沙漠腹地达里雅布依绿洲胡杨林为研究对象,在对区域内68个典型样地进行野外调查的基础上,从森林生产力、森林群落结构和生境因子指标等方面选取了17项指标,运用主成分分析和聚类分析法,构建适用于该区域胡杨林的健康评价指标体系和模型,计算森林健康指数,综合评价该地区胡杨林的健康状况。【结果】①达里雅布依绿洲胡杨林整体森林健康状况较差,有29.4%处于不健康状态,33.8%处于中健康状态,30.9%处于亚健康状态,5.9%处于健康状态。地下水埋深、全氮、郁闭度、Simpson指数以及Shannon-Wiener指数是影响森林健康程度的主要因子。②达里雅布依绿洲胡杨林中,深地下水埋深森林健康指数显著低于浅地下水埋深和中地下水埋深(P<0.05),森林健康水平相对较低。浅地下水埋深森林健康水平相对较高。整体来看,不同地下水埋深森林健康指数:浅地下水埋深(0.65)>中地下水埋深(0.45)>深地下水埋深(0)。③在达里雅布依绿洲不同区域胡杨林中,北部胡杨林的森林健康指数显著低于中部和南部,显示出较低的健康水平,南部森林健康水平相对较高。从北部、中部到南部,森林健康指数总体呈现逐渐上升的趋势,各区域森林健康指数:南部(0.61)>中部(0.58)>北部(−0.01)。【结论】达里雅布依绿洲整体胡杨林健康水平较差,地下水位越浅,胡杨健康指数就越高,不同区域中,从南部、中部到北部胡杨林健康指数呈现降低趋势。
[Objective]The widespread degradation of Populous euphratica forests seriously threatens the ecological security of oases in arid zones.Therefore,mapping the health of P.euphratica forests is important for their sustainable management.[Method]The P.euphratica forests in Dali Yabuyi Oasis in the desert hinterland were taken as the object,and based on the field survey of 68 typical sample plots in the region,17 indexes were selected from the aspects of forest productivity,forest community structure and habitat factors,and the health evaluation index system and health evaluation model applicable to the P.euphratica forests in the region were constructed by using the principal component analysis and the cluster analysis method,the forest health indexes were calculated,and the health of the P.euphratica forests in the region was comprehensively unhealthy state,33.8%in a medium-healthy state,30.9%in a sub-healthy state,and 5.9%in a healthy state.Groundwater burial depth,total nitrogen,depression,Simpson index,and Shannon-Wiener index were the main factors affecting forest health.(2)In the P.euphratica forests of Dali Yabuyi Oasis,the forest health index of deep groundwater burial depth is significantly lower than that of shallow and medium groundwater burial depth(P<0.05),and the forest health level is relatively low.Shallow groundwater burial depths have relatively high levels of forest health.Overall,the forest health indices of different groundwater depths:shallow groundwater depth(0.65)>medium groundwater depth(0.45)>deep groundwater depth(0).(3)Among the P.euphratica forests in different regions of the oasis,the forest health index of the P.euphratica forests in the north is significantly lower than that in the center and south,and the forest health level is relatively low.Forest health is relatively high in the south.Overall,the forest health index showed an increasing trend from the north,center to the south,and the forest health index in different regions:south(0.61)>center(0.58)>north(−0.01).[Conclusion]The overall health level of P.euphratica forests in the oasis is poor,the shallower the water table is,the higher the health index of P.euphratica forests is,and the health index shows a decreasing trend from the south,the center to the north in different regions.
作者
崔传登
师庆东
李想
史浩伯
万彦博
李鼎浩
CUI Chuandeng;SHI Qingdong;LI Xiang;SHI Haobo;WAN Yanbo;LI Dinghao(School of Ecology and Environment,Xinjiang University,Urumqi 830017,Xinjiang,China;Key Laboratory of Oasis Ecology,Ministry of Education,Xinjiang University,Urumqi 830017,Xinjiang,China)
出处
《浙江农林大学学报》
CAS
2024年第6期1134-1141,共8页
Journal of Zhejiang A&F University
基金
国家自然科学基金联合重点支持项目(U1703237)。
关键词
森林健康评价
胡杨林
达里雅布依绿洲
主成分分析
forest health assessment
Populus euphratica forest
Dali Yabuyi Oasis
principal component analysis
