【摘要】：【目的】探索植被演替初期不同土壤基質(zhì)對(duì)微生物碳氮磷含量及其化學(xué)計(jì)量比的影響�！痉椒ā坑�2004年采集天然次生林(演替前樣地)的A層(淋溶層)、B層(淀積層)和C層(母質(zhì)層土)土,分別填入30 cm土層厚度的樣地,構(gòu)成A、B和C處理,分別模擬森林皆伐次生演替、無種子庫次生演替和原生演替,每種處理4個(gè)重復(fù),經(jīng)過10 a自然演替,比較不同土壤基質(zhì)間微生物碳氮磷含量及其化學(xué)計(jì)量比的差異�！窘Y(jié)果】(1)演替前樣地不同土壤基質(zhì)微生物生物量碳氮磷及其占土壤碳氮磷的比例均呈現(xiàn)出A處理顯著高于B、C兩個(gè)處理(P0.05,C處理微生物生物量氮占土壤氮比例除外);土壤微生物生物量碳氮比(n_(Cmic)/n_(Nmic))為A處理低于B、C處理,土壤微生物生物量碳磷比(n_(Cmic)/n_(Pmic))和微生物生物量氮磷比(n_(Nmic)/n_(Pmic))均為A處理高于B、C處理;(2)演替后樣地,不同土壤基質(zhì)微生物生物量碳氮磷呈現(xiàn)出A處理顯著高于B、C兩個(gè)處理(P0.05),其占土壤碳氮磷的比例均呈現(xiàn)出A處理高于B、C兩個(gè)處理;n_(Cmic)/n_(Nmic)為A、B處理低于C處理,n_(Cmic)/n_(Pmic)和n_(Nmic)/n_(Pmic)均為A處理高于B、C處理;(3)經(jīng)過10 a植被演替,A、B、C 3個(gè)處理土壤微生物生物量碳氮磷濃度及其占土壤碳氮磷的比例均上升(B處理n_(Pmic)除外);3個(gè)處理n_(Cmic)/n_(Nmic)下降、n_(Cmic)/n_(Pmic)和n_(Nmic)/n_(Pmic)上升,其中,B、C兩個(gè)處理的n_(Cmic)/n_(Nmic)顯著下降(P0.05),A、C兩個(gè)處理的n_(Nmic)/n_(Pmic)顯著上升(P0.05)�！窘Y(jié)論】植被演替初期,不同土壤基質(zhì)理化性質(zhì)的差異是影響土壤微生物碳氮磷的主要因素。
[Abstract]:[objective] to explore the effects of different soil substrates on microbial carbon, nitrogen, phosphorus and their stoichiometric ratios in the early stage of vegetation succession. [methods] A (leaching layer) layer A (leaching layer) of natural secondary forest (pre-succession plot) was collected in 2004. Accumulation layer) and C layer (parent layer soil) soil, A sample plot with a thickness of 30 cm soil layer was filled into the sample, which was used to simulate the secondary succession of forest clear cutting, no seed bank secondary succession and primary succession respectively. Each treatment was repeated 4 times, and after 10 years of natural succession, there was no secondary succession, no seed bank, no secondary succession and no primary succession. The differences of microbial carbon, nitrogen and phosphorus contents and their stoichiometric ratios among different soil substrates were compared. [results] (1) the microbial biomass carbon, nitrogen, phosphorus and their proportion to soil carbon, nitrogen and phosphorus of different soil substrates in the sample plots before succession showed A position. The soil microbial biomass nitrogen ratio (n _ (Cmic) / n _ (Nmic) was significantly higher than that of the two treatments (except the ratio of microbial biomass nitrogen to soil nitrogen) in P0.05C treatment (n _ (Cmic) / n _ (Nmic) = A was lower than that of BnC treatment). Soil microbial biomass, carbon and phosphorus ratios (n _ (Cmic) / n _ (Pmic) and N _ (Nmic) / n _ (Pmic) were higher than those in B _ C treatment (n _ (Nmic) / n _ (Pmic). Microbial biomass carbon, nitrogen and phosphorus in different soil substrates were significantly higher in A treatment than in Bu C treatment (P0.05), and the proportion of carbon nitrogen and phosphorus in soil under A treatment was significantly higher than that in Bu C treatment (P 0.05). The ratio of N _ (Cmic) / n _ (Nmic) in A treatment was significantly higher than that in C treatment (P 0.05), and the ratio of N _ (Cmic) / n _ (Pmic) and n _ (Nmic) / n _ (Pmic) in treatment A was lower than that in C treatment (P < 0.05). (3) soil microbial biomass carbon, nitrogen and phosphorus concentrations and their proportion to soil carbon, nitrogen and phosphorus increased after 10 years of vegetation succession treatment (except for treatment B, n _ (Pmic), and n _ (Cmic) / n _ (Nmic) decreased by n _ (Cmic) _ n _ (Pmic) and n _ (Nmic) _ n _ (Pmic), respectively. The n _ (Cmic) / n _ (Nmic) of the two treatments decreased significantly (P0.05), and the n _ (Nmic) / n _ (Pmic) of the two treatments increased significantly (P0.05). [conclusion] in the early stage of vegetation succession, the physical and chemical properties of different soil substrates were the main factors affecting soil microbial carbon, nitrogen and phosphorus.
【作者單位】： 東北林業(yè)大學(xué)生態(tài)研究中心;
【基金】：“十二五”國(guó)家科技支撐計(jì)劃(2011BAD-37B01) 教育部長(zhǎng)江學(xué)者和創(chuàng)新團(tuán)隊(duì)發(fā)展計(jì)劃(IRT-15R09)
【分類號(hào)】：S714.3

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