摘要
套种是杉木人工林经营的重要措施,磷是南方森林生态系统中主要限制性养分元素之一,但套种模式对土壤磷素的影响尚不明确。以亚热带杉木人工林表层(0-10 cm)土壤为对象,研究套种林(杉阔套种幼林、杉阔套种成熟林)和杉木幼林土壤理化性质和土壤各形态磷含量差异,分析套种对杉木人工林土壤磷含量的影响。结果表明:(1)不同套种林显著改变土壤总磷、土壤总无机磷、土壤总有机磷、土壤微生物生物量磷(MBP)和土壤酸性磷酸酶活性(APA),大小顺序均为杉阔套种成熟林>杉阔套种幼林>杉木幼林。(2)土壤各磷组分中活性磷含量较低,其中NaHCO3-Po在活性组分中占主导;土壤NaOH-Po是中等活性磷的主要组分,杉阔套种成熟林尤为显著;闭蓄态磷(Residual-P)在总磷含量中最高。(3)与杉木幼林相比,杉阔套种成熟林显著增加了树脂提取态磷(Resin-Pi)、碳酸氢钠提取态有机和无机磷(NaHCO3-Pi、NaHCO3-Po)、氢氧化钠提取态有机和无机磷(NaOH-Pi、NaOH-Po)、氢氧化钠残留提取态有机磷(NaOHu.s-Po)、盐酸提取态磷(HCl-Pi)和闭蓄态磷(Residual-P)含量;土壤总无机磷、NaHCO3-Po、HCl-Pi、NaHCO3-Pi、NaOHu.s-Pi和Residual-P对杉阔套种幼林的响应不敏感。(4)除含水率外不同林龄下杉阔套种林土壤磷形态与土壤理化性质(土壤总碳氮、土壤可溶性有机氮、土壤微生物生物量磷、酸性磷酸酶)呈正相关性(P<0.05)。冗余分析表明,土壤磷组分的变化主要受MBP调控,且MBP与有机磷组分(NaOHu.s-Po、NaOH-Po)和HCI-Pi呈显著正相关。总之,套种林的土壤磷素有效性高于杉木幼林,土壤养分状况更佳。
Interplanting is an important measure during the management of Cunninghamia lanceolata(Chinese fir) plantation. Phosphorus is one of the main limiting nutrient elements in the forests of southern China, but the effect of interplanting model on soil phosphorus is not clear. In this study, soil phosphorus fractions in surface soil(0-10 cm) were determined in different interplanting forests(young Chinese fir interplanting forest, mature Chinese fir interplanting forest) and young pure Chinese fir plantation. The results showed that:(1) Interplanting forests showed increased soil total phosphorus(including organic and inorganic phosphorus), microbial biomass phosphorus(MBP), and acid phosphatase activity(APA) compared with the Chinese fir plantation. Also, soil phosphorus contents were shown as mature Chinese fir interplanting forest > young Chinese fir interplanting forest > young pure Chinese fir plantation.(2) The contents of active phosphorus fractions were the lowest and NaHCO3-Po dominated within the active components. Soil NaOH-Po was the main component of moderately active phosphorus, especially in the mature Chinese fir interplanting forest. The content of Residual-P was the highest among total phosphorus.(3) The mature Chinese fir interplanting with broadleaves trees showed significantly increased contents of resin extracted phosphorus(Resin-Pi), sodium bicarbonate extracted organic and inorganic phosphorus(NaHCO3-Pi, NaHCO3-Po), sodium hydroxide extracted organic and inorganic phosphorus(NaOH-Pi, NaOH-Po), sodium hydroxide residual extracted organic phosphorus(NaOHu.s-Po), hydrochloric acid extracted phosphorus(HCl-Pi), and Residual-P. There were no significant differences in soil total inorganic phosphorus, NaHCO3-Po, NaHCO3-Pi, HCl-Pi, NaOHu.s-Pi, and Residual-P contents between young Chinese fir interplanting forest and pure Chinese fir plantation.(4) There were positive correlations between soil phosphorus fractions and soil physical and chemical properties(such as soil total carbon and nitrogen, dissolved organic nitrogen, microbial biomass phosphorus, acid phosphatase activity) for different interplanting forests except for soil water content(P < 0.05). Redundancy analysis(RDA) indicated that the changes in phosphorus fractions were mainly driven by MBP. Moreover, soil organic phosphorus(NaOHu.s-Po, NaOH-Po) and HCI-Pi was positively correlated with MBP. In conclusion, soil phosphorus availability in Chinese fir interplanting forests were higher than that in young pure Chinese fir forest, and soil nutrient status were also better.
作者
陆宇明
吴东梅
许恩兰
卢胜旭
刘小飞
刘春华
蒋宗垲
郭剑芬
LU Yuming;WU Dongmei;XU Enlan;LU Shengxu;LIU Xiaofei;LIU Chunhua;JIANG Zongkai;GUO Jianfen(College of Geographical Science,Fujian Normal University,Fuzhou 350007;Key Laboratory of Humid Subtropical Eco-Geographical Processes,Ministry of Education,Fuzhou 350007;Xinkou Experimental Forest Farm of Fujian Agriculture and Forestry University,Sanming,Fujian 365000)
出处
《水土保持学报》
CSCD
北大核心
2020年第1期275-282,共8页
Journal of Soil and Water Conservation
基金
国家重点研发计划项目(2016YFD0600304)
福建省高等学校新世纪优秀人才支持计划项目(J1-1253)
关键词
套种
杉木
阔叶树
磷组分
微生物生物量磷
土壤酸性磷酸酶
interplanting
Chinese fir
broadleaved trees
soil phosphorus fractions
microbial biomass phosphorus
soil acid phosphatase activity