摘要
为揭示杉木采伐迹地秃杉(Taiwania flousiana)林和连栽杉木(Cunninghamia lanceolata)林对土壤肥力的影响,以广西南丹县山口林场23年生秃杉人工林和连栽杉木林为研究对象,对杉木人工林采伐后2种更新方式(种植秃杉和连栽杉木)土壤的理化性质和酶活性进行对比分析。结果表明,与连栽杉木林相比,秃杉人工林表层土壤(0~20 cm)和下层土壤(20~40 cm)的非毛管孔隙度、毛度孔隙度、非毛管持水量、最大持水量、田间持水量和渗透性能均呈增大趋势;土壤容重呈减小趋势;非毛管孔隙度、非毛管持水量和最大持水量在表层土壤的差异显著。秃杉人工林不同土层有机质和养分含量普遍高于连栽杉木林,其中水解氮和速效磷含量在表层土壤中的差异显著。过氧化氢酶、蔗糖酶、脲酶和酸性磷酸酶也有相似的变化规律。与连栽杉木林相比,秃杉人工林取代杉木林有利于改善土壤结构和孔隙状况,促进土壤养分的转化,提高土壤肥力。
In order to reveal effect of Taiwania flousiana plantation and successive rotation of Cunninghamia lanceolata plantation on soil fertility on cutover lands of C.lanceolata plantation,taking 23-year-old T.flousiana plantation and successive rotation of C.lanceolata plantation of Shankou forest farm in Nandan of Guangxi as researchobjects,soil physicochemical properties and enzyme activities of two regeneration modes(planting T.flousiana andsuccessive rotation of C.lanceolata)were compared and analyzed.Results showed that compared with successiverotation of C.lanceolata plantation,non-capillary porosity,capillary porosity,non-capillary water holding capacity,maximum water holding capacity,field water holding capacity and permeation capacity in T.flousiana plantationsat top soil layer(0~20 cm)and subsoil(20~40 cm)presented upward trend,whereas the soil bulk density tendedto decrease.There were significant differences in non-capillary porosity,non-capillary water holding capacity andmaximum water holding capacity of top soil layer.The contents of soil organic matter and nutrients in top and subsoilof T.flousiana plantation were generally higher than those of successive rotation of C.lanceolata plantation.Dif-ferences in contents of hydrolyzable N and available P were significant in top soil.The activities of hydrogenperoxidase,sucrase,urease and acid phosphatase showed similar trend.Compared with successive rotation of C.lanceolata plantation,the replacement of C.lanceolata by T.flousiana plantation was benefical to improving soilstructure and porosity,and promoting the transformation of soil nutrients and improving soil fertility.
作者
戴军
周刚
林佳贝
黎伟东
何斌
黄振格
谢敏洋
Dai Jun;Zhou Gang;Lin Jiabei;Li Weidong;He Bin;Huang Zhengge;Xie Minyang(Guangxi State-owned Weidu Forest Farm,Laibin,Guangxi 546000,China;Forestry College of Guangxi University,Nanning,Guangxi 530004,China)
出处
《广西林业科学》
2020年第3期368-372,共5页
Guangxi Forestry Science
基金
广西重点研发计划项目(桂科AB1729008)
广西创新动发展专项资金项目(桂科AA17204087-11)
国家自然科学基金项目(31560206,31760201)。
关键词
土壤理化性质
土壤酶活性
秃杉
杉木
连栽
soil physicochemical properties
soil enzyme activities
Taiwania flousiana
Cunninghamia lanceolata
successive rotation
