摘要
为了探讨林龄对杉木(Cunninghamia lanceolata)人工林土壤理化性质的影响,以杉木幼龄林、中龄林、近熟林和成熟林为对象,研究不同林龄杉木人工林土壤理化性质的变化规律,综合评价不同生长阶段的土壤理化性状。结果表明,林龄对杉木人工林土壤理化性质影响显著。随着林龄的增加,土壤容重逐渐降低,土壤持水能力和p H值逐渐增加,土壤孔隙度先下降后增加,土壤有机质、水解氮和速效钾含量均呈增加-减少-增加的趋势,土壤速效磷含量先增加后减少;随着土层加深,土壤容重逐渐增加,土壤持水能力、孔隙度(成熟林的非毛管孔隙度除外)和养分含量逐渐降低。土壤总孔隙度在综合评价中所占的权重最高;成熟林的土壤理化性质综合评价得分最高。林龄的增加改善了杉木人工林土壤理化性质,可为杉木人工林的抚育管理提供理论依据。
In order to investigate effects of forest age on soil physical and chemical properties of Cunninghamia lanceolata plantation,soil physical and chemical properties of young,middle-aged,near-mature and mature plantations were studied and evaluated.Results showed that forest age had significant effect on soil physical and chemical properties of C.lanceolata plantation.With increase of forest age,soil bulk density decreased gradually;soil water holding capacity and p H increased gradually,soil porosity decreased firstly and then increased;contents of soil organic matter,hydrolyzalbe nitrogen and available potassium showed an increase-decrease-increase trend;soil available phosphorus increased firstly and then decreased.With deepening of soil layer,soil bulk density increased gradually;soil water holding capacity,porosity(except for non-capillary porosity of mature forests)and contents of nutrients decreased gradually.Weight of total soil porosity was the highest in comprehensive evaluation.Comprehensive evaluation of soil physical and chemical properties of mature forest was the highest.Increase of forest age improved soil physical and chemical properties of C.lanceolata plantation,which could provide theoretical basis for management of C.lanceolata plantation.
作者
彭玉华
谭长强
申文辉
郑威
何琴飞
何峰
陈始贵
Peng Yuhua;Tan Zhangqiang;Shen Wenhui;Zheng Wei;He Qinfei;He Feng;Chen Shigui(Guangxi Forestry Research Institute,Nanning,Guangxi 530002,China)
出处
《广西林业科学》
2020年第3期361-367,共7页
Guangxi Forestry Science
基金
广西科技重大专项(桂科AA17204087-8)。
关键词
土壤理化性质
熵权法
林龄
杉木人工林
soil physical and chemical properties
entropy weight method
forest age
Cunninghamia lanceolata plantation
