摘要
梭梭和柠条作为石羊河下游荒漠区生态安全屏障建设的主要树种,分布面积大,在防风固沙、固碳增汇等方面发挥着重要的作用。近20年来,随着地下水位的下降和气候干旱化,梭梭柠条人工林已出现不同程度的衰败和死亡。选择20 a及以上林龄的梭梭、柠条、梭梭+柠条3种林分,对其生长指标、病态指标、更新指标及多样性指标调查,运用模糊判别法从优势种和林下植被两方面评价林分健康状况。结果表明:(1)石羊河下游梭梭柠条整体处于中等健康及以下水平。(2)梭梭柠条混交林健康状况相对优于柠条林、梭梭林,柠条的病虫害轻于梭梭,发芽指数高于梭梭。(3)土壤含水量与其健康序列有明显的正向相关性,健康序列越高含水量越高,全盐量、有机质、速效P分别明显影响着梭梭柠条的高生长、幼苗更新、盖度、枝条发芽和生活型。
Haloxylon ammodendron and Caragana korshinskii are the main tree species for the construction of ecological security barrier in the desert area of the lower reaches of Shiyang River.They have a large distribution area and play an important role in windbreak and sand fixation,carbon sequestration increase and other aspects.In the past twenty years,with the decline of groundwater level and the drought of climate,Haloxylon ammodendron and Caragana korshinskii plantations have declined and died in varying degrees.Three forest stands of Haloxylon ammodendron,Caragana korshinskii,Haloxylon ammodendron+Caragana korshinskii with 20 years and above were selected to investigate their growth index,pathological index,regeneration index and diversity index.The fuzzy discriminant method was used to evaluate the health status of the stand from two aspects of dominant species and understory vegetation.The results showed as the following three aspects.(1)The overall health of Haloxylon ammodendron and Caragana korshinskii in the lower reaches of Shiyang River was in the middle and below level.(2)The health status of the mixed forest of Haloxylon ammodendron and Caragana korshinskii was relatively better than that of Caragana korshinskii forest and Haloxylon ammodendron forest.The disease and insect damage of Caragana korshinskii was lighter than that of Haloxylon ammodendron,and its germination index was higher than that of Haloxylon ammodendron.(3)There was a significant positive correlation between soil water content and its health sequence.The higher the health sequence was,the higher the water content was.The total salt content,organic matter and available P significantly affected the height growth,seedling regeneration,coverage,branch germination and life form of Haloxylon ammodendron and Caragana korshinskii.
作者
许丽
刘永刚
王菊莲
姜俊基
李得禄
袁宏波
Xu Li;Liu Yonggang;Wang Julian;Jiang Junji;Li Delu;Yuan Hongbo(Shiyang River Forestry General Farm in Wuwei City,Minqin 733399,China;Gansu Desert Control Research Institute,Cultivation Base of State Key Laboratory of Desertification and Sandstorm Disaster Prevention and Control,Lanzhou 730070,China)
出处
《防护林科技》
2025年第1期70-77,共8页
Protection Forest Science and Technology
基金
武威市2022年度市级自然科学基金项目“石羊河下游荒漠区盐碱地人工造林植被恢复技术研究及成效评价”(WW2202RPZ030)
甘肃省林业和草原局省级林草自列科技项目“石羊河下游人工灌木混交林生长现状及土壤理化性质研究”(2022kj056)
武威市2023年度市级科技重点研发计划项目-农业类“石羊河下游人工固沙林林分结构特征及优化配置技术研究”(WW23A01YFN009)
甘肃省林业和草原局省级林草自列科技项目“民勤绿洲农田防护林动态变化及发展趋势分析”(2023kj46)
甘肃省林业和草原科技创新项目“河西走廊绿洲防护林体系结构优化和功能提升技术研究”(LCCX202403)。
关键词
梭梭
柠条
人工林
健康评价
Haloxylon ammodendron
Caragana korshinskii
artificial forest
health evaluation
