摘要
对香榧Torreya grandis‘Merrillii’林地进行土壤养分、重金属的空间和时间变异分析,有益于香榧产地土壤管理技术的科学制定。2019年,以浙江省香榧主产区诸暨、柯桥、嵊州、东阳和磐安5县(市)共19个香榧林地的土壤为研究对象,对土壤养分和重金属含量进行分析。结果表明:香榧林地的土壤有机质含量平均为33.76 g·kg^(-1),94.73%的样地处于中等以上水平;土壤水解性N和有效P含量丰富,处于1级水平的样地分别占89.47%和94.73%;土壤速效K含量总体水平居中,平均为159.52 mg·kg^(-1),变异系数为57.10%;土壤pH值平均为4.75,强酸性土壤(<4.5)占36.84%;中、微量元素均为中等变异;土壤重金属含量除As和Cd有部分样地超标外,其余样地的土壤重金属含量均符合《绿色食品产地环境质量标准(NY/T391—2013)》的限值要求。将本次测定结果与2003年戴文圣等对同一区域19个样地的土壤养分和重金属含量测定结果进行对比研究。结果表明,与2003年同一村级区域相比,香榧林地的土壤理化性质得到整体提升,土壤有效P、有机质及速效K含量分列增幅的前三位,微量元素Mo、Fe、B含量等均有不同程度的增加,但土壤养分失衡问题依然存在,仍有5.27%样地K元素处于极低水平,Ca含量下降了47.69%,土壤pH下降了0.78个单位,土壤酸化严重。基于以上研究结果,建议香榧林地土壤管理以提升养分利用率、改善物理性质为目标,制定“控氮减磷平衡钾”的科学配施方案,提高生物有机肥和生物菌肥用量,严格控制重金属施入性外源污染。
In September and October during 2019,soil samples of 0-20 cm and 20-40 cm were collected at 19 Torreya grandis‘Merrillii’standsin Zhuji,Keqiao,Shengzhou,Dongyang and Pan’an,where were the major production area of Zhejiang province.Determinations were implemented in the same year of collection on content of soil nutrients and heavy metal.The results showed that the average soil organic matter content was 33.76g/kg,meaning that 94.73%of the samples were above the medium level.The contents of hydrolyzable N and available P in the soil were rich,with 89.47%and 94.73%at level 1.The mean available K content was 159.52 mg/kg,and the variable coefficient was 57.10%.The average pH value of the soil was 4.75,and 36.84%of the samples were strongly acidic(<4.5).Medium and trace elements showed moderate variation.According to NY/T 391-2013,the content of heavy metals among the samples was within the limit except that of As and Cd.Comparison was made on the results of 2019 and that by Dai Wen-sheng in 2003 in the same stands.It showed that soil physical and chemical properties were improved,especially content of available P,organic matter and available K.Content of Mo,Se and B increased.However K element content of 5.27%samples was at a very low level.The content of Ca decreased by 47.69%,and soil pH decreased by 0.78.
作者
刘亚群
刘荣昌
程诗明
成亮
柏明娥
胡单
刘汝明
韩素芳
LIU Ya-qun;LIU Rong-chang;CHENG Shi-ming;CHENGLing;BAI Ming-e;HU Dan;LIU Ru-ming;HAN Su-fang(Zhejiang Academy of Forestry,Hangzhou 310023,China;Chun'an Fuxi Forest Farm of Zhejiang,Hangzhou 311700,China;Quzhou Kecheng Forestry Extension Center of Zhejiang,Quzhou 324000,China)
出处
《浙江林业科技》
2022年第4期9-16,共8页
Journal of Zhejiang Forestry Science and Technology
基金
浙江省省院合作重点项目“香榧精准测土配方施肥技术研究与示范”(2018SY09)。
关键词
香榧
林地
土壤养分
重金属
含量变化
Torreya grandis‘Merrillii’
stand
soil nutrient content
heavy metal
change
