利用主成分分析对不同覆盖时间毛竹林土壤质量进行评价——以浙江长兴毛竹林为例  

Evaluation of Soil Quality in Different Mulched Times of Phyllostachys edulis Forest by Principal Component Analysis-A Case of Phyllostachys edulis Forest in Zhejiang Changxing

作　　者：李颖 朱炜 徐新泉 王波[2] 倪惠菁 计玮玮 邱虹 陈梦姣 Li Ying;Zhu Wei;Xu Xinquan;Wang Bo;Ni Huijing;Ji Weiwei;Qiu Hong;Chen Mengjiao(Huzhou Ecological Forestry Protection Research Center,Huzhou 313000,P.R.China;Zhejiang Academy of Forestry;Liangxi Forest Park Administration Office,Huzhou City,Zhejiang Province(Huzhou State-owned Forest Farm);Huzhou Ecological Forestry Protection Research Center)

机构地区：[1]湖州市生态林业保护研究中心,湖州313000 [2]浙江省林业科学研究院 [3]浙江省湖州市梁希森林公园管理处(湖州市国有林场)

出　　处：《东北林业大学学报》2024年第1期85-91,共7页Journal of Northeast Forestry University

基　　金：湖州市科技计划公益性应用研究项目(2021GZ42)。

摘　　要：为探究不同覆盖时间对毛竹(Phyllostachys edulis)林土壤理化性质的影响,选择不同覆盖时间(覆盖1 a、连续覆盖2、3 a)的毛竹林,测定并分析了不同土层深度(d)(0<d≤20 cm、20 cm<d≤40 cm)土壤理化性质的差异,将16个理化指标运用主成分分析法进行分析,用以综合评价毛竹林土壤质量。研究结果表明:毛竹林覆盖经营显著提高了表层(0<d≤20 cm)土壤含水量、最大持水量、毛管持水量、田间持水量、毛管孔隙度和总孔隙度,降低了土壤密度,土壤结构得到改善,但均随覆盖时间的增加呈降低趋势;连续覆盖2 a后,毛竹林土壤有机碳和速效养分(碱解氮、有效磷、速效钾)质量分数最高,全氮和全磷质量分数持续增加。对于较深层(20 cm<d≤40 cm)土壤,覆盖导致土壤密度增加,土壤含水量和田间持水量呈下降趋势;在连续覆盖3 a后才对其田间持水量、pH、全氮和碱解氮质量分数、全钾质量分数产生显著影响,其中全氮质量分数显著增加,田间持水量、pH、碱解氮和全钾质量分数显著降低。运用主成分分析法,得到不同覆盖时间毛竹林的土壤质量综合排序,0<d≤20 cm土层土壤质量从高到低依次为:连续覆盖2 a、覆盖1 a、连续覆盖3 a、未覆盖;20 cm<d≤40 cm土层土壤质量从高到低依次为:覆盖1 a、未覆盖、连续覆盖3 a、连续覆盖2 a。短期的覆盖经营(1~2 a)对于提升土壤质量具有促进作用,但是长期连续覆盖(≥3 a),土壤酸化程度加剧且质量显著降低。To explore the effects of different mulching times on the soil physicochemical properties of Phyllostachys edulis forests,different mulching times(mulching for 1 year,continuous mulching for 2 years,and continuous mulching for 3 years)of P.edulis forests were selected.The differences in soil physicochemical properties at different soil depths(0<d≤20 cm,20 cm<d≤40 cm)were measured and analyzed.Principal component analysis was used to analyze 16 physicochemical indicators to comprehensively evaluating the soil quality of P.edulis forests.The results showed that the mulching management significantly increased the soil moisture content,maximum water holding capacity,capillary water holding capacity,field water holding capacity,capillary porosity,and total porosity of the surface soil(0<d≤20 cm),and decreased the soil bulk density.The soil structure was improved,but all of them showed a decreasing trend with the increase of mulching time.After continuous mulching for 2 years,the contents of soil organic carbon and available nutrients(alkaline nitrogen,available phosphorus,available potassium)were highest,and the content of total nitrogen and total phosphorus continued to increase.For the deeper soil layer(20 cm<d≤40 cm),mulching led to an increase in soil bulk density and a decrease trend in soil moisture content and field water holding capacity.Only after continuous mulching for 3 years did it have a significant impact on field water holding capacity,pH,total nitrogen and alkaline nitrogen contents,and total potassium content,among which the total nitrogen content increased significantly,while field water holding capacity,pH,alkaline nitrogen,and total potassium contents decreased significantly.Principal component analysis was used to obtain the comprehensive ranking of soil quality in P.edulis forest with different mulching times.For the soil layer of 0<d≤20 cm,the soil quality from high to low was as follows:continuous mulching for 2 years,mulching for 1 year,continuous mulching for 3 years,and without mu

关 键 词：毛竹 覆盖经营 土壤质量 主成分分析 

分 类 号：S750[农业科学—森林经理学] S714[农业科学—林学]