石羊河下游不同林龄梭梭(Haloxylon ammodendron)群落特征及健康度分析  

Community features and health evaluation of the different-aged Haloxylon ammodendron at downstream of Shiyang River

作　　者：张颢译 王立[1] 徐先英[1,2] 刘虎俊[2] 张瑜忠 李雪宁 ZHANG Haoyi;WANG Li;XU Xianying;LIU Hujun;ZHANG Yuzhong;LI Xuening(Forestry College of Gansu Agricultural University,Lanzhou 730070,China;Gansu Institute of Sand Control,Cultivation Base of State Key Laboratory of Desertification and Sandstorm Disaster Prevention,Lanzhou 730070,China;Institute of Desertification,Chinese Academy of Forestry Sciences,Beijing 100091,China)

机构地区：[1]甘肃农业大学林学院,甘肃兰州730070 [2]甘肃省治沙研究所,荒漠化与风沙灾害防治国家重点实验室培育基地,甘肃兰州730070 [3]中国林业科学研究院荒漠化研究所,北京100091

出　　处：《甘肃农业大学学报》2023年第2期116-122,共7页Journal of Gansu Agricultural University

基　　金：甘肃省重大项目“八步沙及河西走廊典型风沙区退化防风固沙体系修复关键技术研究与示范”(21ZD4FA010);甘肃省林草局项目“低覆盖度非均匀配置防风固沙林防护效益的风洞实验研究”(ky20-09)。

摘　　要：【目的】调查和评价石羊河下游梭梭(Haloxylon ammodendron)防风固沙林的群落特征及其健康度,为防护林健康评价提供依据。【方法】选择30 a、20 a和10 a的梭梭林,调查高度、基径、冠幅、新枝长、密度、幼苗数、地面结皮等指标,分析Margale丰富度指数、Simpson指数等,应用专家打分和层次法确定指标权重,借鉴VOR模型的指标体系,分析HI健康指数。【结果】随着林龄增加,3种梭梭林的密度和优势度分别降低76%和62.19%,物种多样性和土壤结皮面积分别增加1.79倍和5.70倍。梭梭林健康指数表现为:30 a>20 a>10 a,差异性不显著(P>0.05);10 a林与30 a林的活力指标差异显著(P<0.05),其余指标差异不显著。10 a林的恢复指标较低,结构指标大于20 a和30 a的。【结论】随着林龄增加,梭梭林的种群退化,群落多样性增大,但健康度差异不显著,10 a林龄是管理的关键时期。【Objective】The study was conducted to investigate the community features and perform health evaluation of Haloxylon ammodendron windbreak in the downstream of Shiyang River,laying a foundation for its management.【Method】Haloxylon ammodendron windbreak of 30 years(a),20 years(a)and 10 years(a)old were employed,and the height,base diameter,crown width,new twig length,density,seedling number and ground crust were measured.Following this,Margale richness index and Simpson index were calculated,and the HI health index was analyzed by referring to the index system of VOR model,with the index weight determined by expert scoring and hierarchy method.【Result】With the forest aged,the density and dominance of the three Haloxylon ammodendron windbreak decreased by 76%and 62.19%,respectively,and the species diversity and soil crust area increased by 1.79 and 5.70 times,respectively.Health index was the highest for the 30 a H.ammodendron windbreak,followed by that of 20 a and 10 a,among which the differences were not significant(P>0.05).The vigor index for the 10a forest was significantly different with the 30a windbreak(P<0.05),and there was no significant difference among the other indexes.The resilience index of the 10 a windbreak was relatively low,and its organization index was greater than that of the 20 a and 30 a.【Conclusion】With the windbreak aged,the population of H.ammo⁃dendron windbreak degenerated and the community diversity increased,while the health status did not varied significantly.The 10 a age was the key period of the management of H.ammodendron windbreak.

关 键 词：石羊河下游 梭梭防风固沙林 群落特征 VOR健康模型 健康评价 

分 类 号：S793.9[农业科学—林木遗传育种]