西北林学院学报2024，Vol.39Issue(1)：44-51,8.DOI:10.3969/j.issn.1001-7461.2024.01.06
川西柳杉幼林间伐后林下植被和土壤特征变化
Understory Vegetation and Soil Characteristic Variations of Young Cryptomeria japonica var.sinensis Plantations After Thinning in Western Sichuan
摘要
Abstract
To alleviate the deficiencies of high density and poor standing quality of Cryptomeria japonica var.sinensis plantations,a thinning management was conducted to analyze and compare the responses of understory vegetation and soil properties on thinning intensities and to provide a theoretical basis for scien-tific management of the plantations.Taking the 8-year-old C.japonica var.sinensis plantations in Yangzil-ing State Owned Forest Farm,Ya'an City,Sichuan Province,China,as the research objects,four thinning in-tensities were set in an initial density of 2 800 plants·hm-2(control,0％;light,20％;medium,30％;heavy,40％)to carry out thinning experiment.Four years after thinning,the variation of understory vege-tation diversity and soil properties were analyzed.It was found that in herb layer,no significant differences were found in Shannon and Pielou indices among different thinning treatments,and the diversity index of light thinning was the lowest.In shrub layer,Shannon index,Pielou index and species richness of the thinning treatment were 7,3,and 6 times of the control.Moreover,the increase of species richness in the shrub layer was significantly higher than that in the herb layer.The soil physical properties were signifi-cantly improved by thinning.The soil bulk density decreased significantly with the increase of thinning in-tensities,and the medium thinning intensity decreased by 24.45％compared with the control.The soil cap-illary porosity of light and medium thinning treatments were significantly different from that of the con-trol.Compared with the control,soil pH and available phosphorus content of heavy thinning decreased by 6.79％and 25％,and the contents of soil organic matter,total nitrogen,total phosphorus and hydrolyzed nitrogen increased with the increase of thinning intensities,and soil organic matter content of light thinning treatment increased by 94.66％compared with the control.The activities of soil catalase and sucrase in-creased with the increase of thinning intensities,and the highest activities were found in heavy and medium thinning treatments,and the differences were significant compared with other treatments.The results of redundancy analysis showed that annual DBH growth,herb layer vegetation diversity were correlated with soil total and hydrolyzed nitrogen.The study indicates that thinning management can be used to improve the environment for young C.japonica var.sinensis plantation in western Sichuan.关键词
柳杉人工林/间伐强度/林下植被/土壤理化性质/土壤酶活性/冗余分析Key words
Cryptomeria japonica var.sinensis plantation/thinning intensity/understory vegetation/soil physicochemical property/soil enzyme activity/redundancy analysis分类
农业科技引用本文复制引用
周璇,刘凯利,胡佳怡,董凯丽,赵苏亚,龚映匀,陈国敏,张斌,王瑞辉..川西柳杉幼林间伐后林下植被和土壤特征变化[J].西北林学院学报,2024,39(1):44-51,8.基金项目
国家林业和草原局"森林抚育成效监测国家级样地及监测体系建设项目"(2016-28-11) （2016-28-11）
湖南省研究生科研创新项目(CX20200706) （CX20200706）
中南林业科技大学研究生创新基金. （）
