施肥对日本落叶松人工林细根生物量的影响  被引量:37

Effects of fertilization on fine root biomass of Larix kaempferi plantation

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作  者:于立忠[1] 丁国泉[1] 朱教君[2] 史建伟[1] 于水强[1] 王政权[1] 

机构地区:[1]东北林业大学林学院,哈尔滨150040 [2]中国科学院沈阳应用生态研究所,沈阳110016

出  处:《应用生态学报》2007年第4期713-720,共8页Chinese Journal of Applied Ecology

基  金:国家自然科学基金重点资助项目(30130160)

摘  要:以辽宁东部山区16年生日本落叶松人工林为研究对象,探讨施肥对落叶松细根总生物量、不同层次生物量及不同根序生物量的影响.结果表明,与对照相比,施氮肥显著降低细根总生物量(P〈0.01),而施磷肥及施氮+磷肥处理的细根总生物量差异不显著(P〉0.05).落叶松人工林表层土壤(0~10cm)细根生物量明显高于亚表层(10~20cm)(P〈0.01),各处理样地表层生物量占总生物量的64%~73%.施肥对不同层次、不同级别根序细根生物量的影响不同.与对照相比,施氮肥显著地降低了表层土壤1、3、4、5级根生物量(P〈0.05),施磷肥(5级根除外)、施氮+磷肥(2级根除外)表层土壤各级根序细根生物量降低均不显著(P〉0.05).在亚表层土壤,施氮肥和磷肥对各级根序生物量均没有显著影响(P〉0.05);施氮+磷肥显著增加了1级根生物量(P〈0.05),而其余各级根序细根生物量差异不显著(P〉0.05).With 16 years old Larix kaempferi plantation in eastern mountain area of Liaoning Province as test object, this paper studied its total fine root biomass, fine root biomass at different soil depths, and biomass of different root orders under effects of fertilization. The results showed that compared with no fertilization, applying N decreased the total fine root biomass significantly (P 〈 0. 05 ), while the difference between applying P and N + P was not significant. The fine root biomass in top soil (0-10 cm) was significantly (P 〈0. 01 ) higher than that in subsoil (10-20 cm), and in all treatments, it accounted for 64%-73% of the total. The effects of fertilization on fine root biomass varied with soil depth and root orders. In top soil, N fertilization decreased five orders (except the second order) fine root biomass significantly ( P 〈 0. 05 ), while P and P + N fertilization had no significant effects (P 〉 0. 05 ) , except the fifth order root in treatment P, and the second order root in treatment P + N (P 〈 0. 05). In subsoil, treatments N and P had no effects on five orders fine root biomass ( P 〉 0. 05 ), while treatment N + P increased the first order fine root biomass significantly (P 〈 0. 05 ).

关 键 词:施肥 日本落叶松 细根根序 生物量 

分 类 号:S791.223[农业科学—林木遗传育种]

 

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