摘要
为研发低质低效林更新改造技术模式和新建人工林最优配置模式,促进沙漠杨树林生态产业功能提升,以库布齐沙漠沿线锁边林达拉特旗周边南营子、白土梁、白泥井和七里沙为研究区,计算了退化林杨树的生长指标并对杨树生长状态及退化原因进行了分析,结果表明:从调查的2777个杨树单株生长状态特征来看,好和较好状态树木,叶小稀疏、1/2以上有叶、1/4以上枯、1/2以上枯状态的树木以及3/4以上枯死状态树木、枯木、断木各占总量1/3,表现为防护林衰退显著。南营子防护林退化严重,绝大部分树木已经枯死;白泥井防护林退化较严重,树木呈现出衰退趋势;白土梁防护林退化现象较轻,树木开始出现衰退状态,但衰退不明显;七里沙防护林退化现象较轻,杨树生长状态良好,生命特征明显,无退化样方,杨树生长发育达到最大值;林场退化的原因是树木生长过熟,自然老化,由于地下水的开采,导致树木本身的生存环境发生改变,持续干旱和地下水位大幅下降,加速了林分衰老退化。
In order to develop the regeneration technology model of low quality and low efficiency forest and the optimal allocation model of newly constructed artificial forest,and promote the ecological industry function improvement of desert poplar forest,this study took Nanyingzi,Bailiang,Bailiang,and Qili Sha around Suobian Dalat Banner along the Kubuqiqi Desert as the research area,calculated the growth indicators of degraded forest poplar and analyzed the growth state and degradation causes of Populus L.The results showed that from the characteristics of the growth status of 2777 poplar trees,the trees in good and better condition,small and sparse leaves,more than half of the trees with leaves,more than 1/4 of the trees in dead state,more than 1/2 of the trees in dead state and more than 3/4 of the trees in dead state,dead wood and broken wood all accounted for 1/3 of the total,which showed that the decline of protective forest was significant.Nanyingzi shelterbelt degradation is serious,most of the trees have died;The degradation of Bainijing shelterbelt was serious and the trees showed a trend of decline.The degradation of white soil beam shelterbelt was light,and the trees began to decline,but the decline was not obvious.The degradation phenomenon of Qili Sha shelterbelt is light;the Populus L.growth state is good;the life characteristics are obvious without degenerate quadrat;the growth and development of Populus L.reach the maximum;The reason for forest farm degradation is that trees grow overripe and age naturally.Due to the exploitation of underground water,the living environment of trees changed,and the continuous drought and the significant decline of underground water level accelerate the aging and degradation of forest stands.
作者
包文凭
王海兵
乔永刚
安达
高利颖
Bao Wenping;Wang Haibing;Qiao Yonggang;An Da;Gao Liying(College of Desert Management,Inner Mongolia Agricultural University,Hohhot,Inner Mongolia 010018,China;Ordos City Afforestation Plant Zhan Dan Zhao Branch,Ordos,Inner Mongolia 014324,China)
出处
《绿色科技》
2023年第8期17-22,27,共7页
Journal of Green Science and Technology
基金
内蒙古自治区“科技兴蒙”行动重大专项(编号:KJXM-EEDS-202006)。
关键词
杨树
防护林退化
低质低效
生长状态
退化程度
Populus L.
shelterbelt degradation
low quality and low efficiency
growth state
degradation degree
