摘要
为探究间伐未混交和间伐后混交处理对尾巨桉(Eucalyptus urophylla×E.grandis)人工林林分光环境和土壤理化性质的影响,以尾巨桉人工林为研究对象,设置3个间伐强度(T1=56.5%、T2=70.7%和T3=85.9%),以未间伐林分为对照(T0),间伐后部分林分按1∶1∶1的比例分别套种米老排(Mytilaria laosensis)(T1-M)、灰木莲(Manglietia glauca)(T2-M)和红锥(Castanopsis hystrix)(T3-M),分析尾巨桉人工林林分光环境和土壤理化性质。结果表明,间伐后林分的叶面积指数(LAI)和平均叶倾角(MTA)显著高于T0处理,T2-M处理的林分LAI最高。在0~20和20~40 cm土层,T3和T3-M处理的土壤pH值均显著高于T0处理;T2和T2-M处理的土壤容重均显著低于T0处理;土壤非毛管孔隙度、总孔隙度、最大持水量、毛管持水量和田间持水量均高于T0处理;T1处理的土壤速效磷含量显著高于T0处理;T1-M处理的土壤铵态氮和全钾含量均高于T0处理。相关性分析表明,林分光环境与土壤理化性质之间存在显著相关。T2-M处理可优化土壤物理性质;T3和T3-M处理均可缓解土壤酸化;T1-M处理可维持较高水平的土壤全氮、硝态氮、铵态氮、全磷和全钾含量;T1处理能维持较高的土壤速效养分含量。
In order to explore effects of thinning without mixing and thinning with mixing treatments on light environment and soil physicochemical properties of Eucalyptus urophylla×E.grandis plantations,taking E.urophylla×E.grandis plantations as research objects,three thinning intensities(T1=56.5%,T2=70.7%and T3=85.9%)were designed,and unthinned stand was control(T0).After thinning,parts of stands were interplanted with broad-leaved tree species such as Mytilaria laosensis(T1-M),Manglietia glauca(T2-M)and Castanopsis hystrix(T3-M)at a ratio of 1∶1∶1.Light environment and soil physicochemical properties of E.urophylla×E.grandis plantations were analyzed.Results showed that leaf area index(LAI)and mean tile angle(MTA)of stands after thinning were significantly higher than T0 treatment,and LAI of T2-M treatment was the largest.In 0-20 and 20-40 cm soil layers,T3 and T3-M treatments had significantly higher soil pH than T0 treatment.T2 and T2-M treatments had significantly lower soil bulk density than T0 treatment.Soil non-capillary porosity,total porosity,maximum moisture capacity,capillary moisture capacity,and field capacity in T2 and T2-M treatments were higher than T0 treatment.T1 treatment had significantly higher soil available phosphorus content than T0 treatment.T1-M treatment had higher soil ammonium nitrogen and total potassium contents than T0 treatment.Correlation analysis showed that there were significant relationships among light environment indexes and soil physicochemical properties.T2-M treatment could optimise soil physical properties.T3 and T3-M treatments could alleviate soil aciddification.T1-M treatment could maintain higher levels of total nitrogen,nitrate nitrogen,ammonium nitrogen,total phosphorus,and total potassium.T1 treatment could retain high soil available nutrient contents.
作者
王杰
杨梅
徐圆圆
沈彬
李万年
伍勇
Wang Jie;Yang Mei;Xu Yuanyuan;Shen Bin;Li Wannian;Wu Yong(Guangxi State-owned Qipo Forest Farm,Nanning,Guangxi 530225,China;College of Forestry,Guangxi University,Nanning,Guangxi 530004,China)
出处
《广西林业科学》
2023年第4期411-418,共8页
Guangxi Forestry Science
基金
广西自然科学基金重点项目(2021GXNSFDA196003)
广西林业科技推广示范项目(gl2020kt01)。
关键词
光环境
土壤理化性质
间伐
混交
桉树
light environment
soil physicochemical property
thinning
mixing
Eucalyptus spp.
作者简介
第一作者:王杰(1985-),男,工程师,主要从事营造林技术研究;通信作者:伍勇(1980-),男,工程师,主要从事营造林技术研究。
