【摘要】：以福建福州市常見的15種喬木、灌木和草本綠化植物為對(duì)象,連續(xù)2年取樣測(cè)定了這些植物、凋落物、立地土壤、土壤微生物量C、N、P含量,探討城市綠化植物-凋落物-土壤系統(tǒng)生態(tài)化學(xué)計(jì)量特征,為中國(guó)城市綠化植物的生態(tài)功能恢復(fù)與植被重建提供科學(xué)依據(jù)。結(jié)果表明:(1)綠化植物不同器官C、N、P含量均表現(xiàn)為草本灌木喬木、C含量N含量P含量、葉莖根,呈現(xiàn)出葉的富集作用;綠化植物各器官化學(xué)計(jì)量比(C/N、C/P、N/P)也表現(xiàn)出基本一致的喬木灌木草本的變化趨勢(shì);各綠化植物對(duì)N的再吸收率極顯著高于對(duì)P的再吸收率(P0.01),綠化植物N和P再吸收率表現(xiàn)為喬木灌木草本,不同綠化植物對(duì)N的再吸收率差異均顯著(P0.05),對(duì)P的再吸收率差異均不顯著(P0.05)。(2)綠化植物凋落物C、N、P含量基本表現(xiàn)為草本灌木喬木,其中不同綠化植物凋落物P含量差異不顯著。(3)綠化植物立地土壤C、N、P含量表現(xiàn)為草本灌木喬木,但其N/P差異不顯著;土壤微生物量C、N、P含量基本表現(xiàn)為草本灌木喬木,其相應(yīng)的C/N、C/P、N/P差異均不顯著。(4)植物-土壤-凋落物-土壤微生物量(C、N、P)均隨著生長(zhǎng)季溫度的升高而降低,隨著年降水量的增加而升高,P素的回歸系數(shù)絕對(duì)值明顯低于C素和N素;植物-凋落物-土壤的C與N含量、N與P含量、C/P與N/P、以及土壤和植物的C/N與N/P之間均呈顯著正相關(guān)關(guān)系,而凋落物的C/N與N/P之間呈顯著負(fù)相關(guān)關(guān)系;典范對(duì)應(yīng)CCA排序中,植物高度、冠幅、莖粗、比葉面積和葉面積指數(shù)對(duì)植物-凋落物-土壤-土壤微生物量C、N、P含量和C/N、C/P和N/P具有較大影響作用,其中高度、冠幅和莖粗與比葉面積和葉面積指數(shù)呈負(fù)相關(guān)關(guān)系,與凋落物-土壤-土壤微生物量C、N、P含量呈負(fù)相關(guān)關(guān)系,與植物C、N、P含量呈正相關(guān)關(guān)系;而凋落物-土壤-土壤微生物量C、N、P含量與其C/N、C/P和N/P均具有一定的正相關(guān)關(guān)系。
[Abstract]:The contents of microbial biomass C, N, P in 15 common species of trees, shrubs and herbs in Fuzhou City, Fujian Province, were measured by sampling for 2 consecutive years, including litter, site soil, soil microbial biomass C, N, P, and soil microbial biomass (C, N, P). The ecological stoichiometric characteristics of urban greening plant-litter-soil system were discussed in order to provide scientific basis for ecological function restoration and vegetation reconstruction of urban greening plants in China. The results were as follows: (1) the contents of C, N and P in different organs of greening plants were herbaceous shrub trees, C content N content P content, leaf stem root content, showing leaf enrichment; The stoichiometric ratios (C _ (N), C _ (P), N _ (P) of the organs of green plants also showed the same trend of change of shrub herbs. The reabsorption rate of N in greening plants was significantly higher than that of P (P0.01). The reabsorption rates of N and P in greening plants were trees, shrubs and herbs, and the reabsorption rates of N in different greening plants were significantly higher than those of P (P0.05), and the reabsorption rates of N and P in greening plants were significantly higher than those of P (P0.01). The difference of P reabsorption rate was not significant (P0.05). (2). The contents of C, N and P in greening plant litter were basically herbaceous shrub trees. (3) the content of C, N, P in the soil of green plant site showed herbaceous shrub trees, but there was no significant difference in P content of litter in different greening plants. (3) the content of N, N and P in the soil of greening plant site was not significantly different from that of herbaceous shrub trees. The contents of soil microbial biomass C, N, P were basically herbaceous shrub trees, and there was no significant difference between them. (4) Plant-soil-litter-soil microbial biomass (C, N, P). P) decreased with the increase of temperature in growing season, and increased with the increase of annual precipitation, and the absolute value of P-element regression coefficient was obviously lower than that of C-element and N-element; There were significant positive correlations between C and N, N and P, C / N and N / P in plant-litter-soil, and C / N and N / N in soil and plant, and there was significant positive correlation between C and N, C / P, C / N and N / P in soil and plant. There was a significant negative correlation between C _ (N) and N _ (P) in litter. In the canonical CCA sequence, plant height, crown width, stem diameter, specific leaf area and leaf area index had significant effects on plant-litter-soil microbial biomass C, N, P content and C, C and N P. Height, crown width and stem diameter were negatively correlated with specific leaf area and leaf area index, litter-soil microbial biomass C, N, P content, and plant C, N, P content were positively correlated. The litter-soil microbial biomass C, N, P contents were positively correlated with C / N, C / P and N / P contents.
【作者單位】： 福州大學(xué)建筑學(xué)院;廈門大學(xué)建筑與土木工程學(xué)院;
【基金】：福建省自然科學(xué)基金面上項(xiàng)目(2016J01732)
【分類號(hào)】：S154.4

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