杉木采伐迹地营造阔叶树对不同层次土壤磷组分和有效性的影响  

Effects of broadleaved tree plantation on soil phosphorus fractions and availability in diffe rent soil layers in a logged Cunninghamia lanceolata woodland

作　　者：王涛[1,2] 万晓华 王磊[1,2] 邹秉章 王思荣 黄志群 WANG Tao;WAN Xiao hua;WANG Lei;ZOU Bing zhang;WANG Si rong;HUANG Zhi qun(School of Geo graphical Science,Fujian Normal University,Fuzhou 350007,China;Cultivation Base of State Key Laboratory of Humid Subtropical Mountain Ecology,Fuzhou 350007,China;Fujian Shanghang Baisha Forestry Farm,Shanghang 364205,Fujian,China)

机构地区：[1]福建师范大学地理科学学院,福州350007 [2]湿润亚热带山地生态国家重点实验室培育基地,福州350007 [3]福建省上杭白砂国有林场,福建上杭364205

出　　处：《应用生态学报》2020年第4期1088-1096,共9页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目(31570604,31600495);国家杰出青年基金项目(31232212);福建省自然科学基金项目(2018J01714);福建省林业科技项目([2018]26)资助。

摘　　要：磷限制是亚热带人工林经营面临的主要问题之一,研究阔叶树代替针叶树造林对不同土壤层次磷组分和有效性的影响对维持亚热带地区森林生态系统的可持续发展具有重要意义。以1993年春天在二代杉木林采伐迹地上同时营造的阔叶树米老排人工林和针叶树杉木人工林为对象,研究0~100 cm不同土层土壤理化性质、磷组分及其有效性的变化。结果表明:两种林分下土壤有机磷含量均随土层加深而显著下降;与杉木林相比,米老排林0~10和10~20 cm土层有效磷含量显著增加,分别增加35.7%和86.2%,易分解态磷和中等易分解态磷均随土层加深而显著降低,表层(0~20 cm)土壤易分解态磷和中等易分解态磷含量显著增加,80~100 cm土层难分解态磷含量显著降低,下降13.6%,20~80 cm土层游离态铁含量显著降低。冗余分析表明,可溶性有机碳和游离态铁是土壤磷组分变化的关键影响因子。在杉木采伐迹地上营造阔叶树改变了磷在土壤剖面上的分布格局,有利于提高磷的有效性。Phosphorus(P)limitation is one of the major issues for the management of subtropical plantations.Understanding the effects of tree species transition from conifer to broadleaved trees on soil P fraction and availability in different soil layers are of great significance for the sustainable de velopment of subtropical forests.We compared changes in soil chemical properties,P fraction and availability across 0-100 cm soil profile between Mytilaria laosensis and Cunninghamia lanceolata plantations,which were initially reforested from C.lanceolata plantation in the spring of 1993.The results showed that soil organic P content in both plantations decreased significantly with soil depth.Compared with C.lanceolata,the M.laosensis plantation significantly increased soil available P content by 35.7%and 86.2%in the 0-10 and 10-20 cm,respectively.The contents of soil labile P and moderately labile P decreased significantly with soil depth in both plantations.The contents of labile P and moderately labile P were significantly higher in the surface soil(0-20 cm),while the non labile P in the 80-100 cm was increased by 13.6%,and the free iron content in the 20-80 cm significantly decreased.Results of redundancy analysis showed that dissolved organic carbon and free iron were the most important factors influencing P fraction in those plantations.Tree species transition from C.lanceolata to M.laosensis could change the pattern of soil P fraction in soil pro file,and greatly enhance soil P availability.

关 键 词：Hedley磷分级 阔叶树 磷有效性 有机磷 铁铝氧化物 

分 类 号：S714.2[农业科学—林学]