本文選題：生態(tài)化學(xué)計(jì)量學(xué) + 養(yǎng)分再吸收　； 參考：《生態(tài)學(xué)報(bào)》2017年16期

【摘要】：了解我國黃土高原子午嶺林區(qū)兩種天然林下植物葉片-凋落葉-土壤生態(tài)化學(xué)計(jì)量特征,有助于人們更深入地認(rèn)識(shí)黃土高原子午嶺天然次生林生態(tài)系統(tǒng)養(yǎng)分循環(huán)規(guī)律和系統(tǒng)穩(wěn)定機(jī)制。結(jié)果表明:(1)遼東櫟和白樺兩種植物葉片碳、氮、磷平均含量為468.6、17.1、2.1 g/kg;凋落葉碳、氮、磷平均含量為457.3、12.5、1.6 g/kg;土壤碳、氮、磷平均含量分別為17.6、1.4、0.5 g/kg。(2)白樺葉片N、P含量之間II類線性回歸斜率大于1(P=0.07),表明白樺葉片建成過程中存在N、P元素按比例投入的依賴。白樺凋落葉N、P含量之間的II類線性回歸斜率顯著小于1(P0.05),兩種天然次生林凋落葉整體N、P含量之間的II類線性回歸斜率也顯著小于1(P0.05),反映了凋落葉中單位P含量與單位N含量間不存在等速損耗關(guān)系。(3)黃土高原子午嶺兩種天然次生林凋落葉氮含量與土壤氮含量具有顯著相關(guān)性(P0.01),表明凋落葉分解對(duì)土壤氮庫有增加作用。相比于凋落葉,植物葉片磷含量與土壤磷含量具有較緊密的關(guān)系,表現(xiàn)為高的土壤P含量則植物葉片也具有較高的P含量。黃土高原子午嶺林區(qū)兩種天然次生林下土壤有機(jī)質(zhì)具有較快的礦化作用。(4)遼東櫟作為植被演替到頂極群落的優(yōu)勢(shì)物種,其凋落葉C∶N值為26.7遠(yuǎn)低于白樺凋落葉C∶N值44.9(P0.05),有利于微生物對(duì)凋落葉的分解。兩種天然次生林的植物葉片N∶P均值為7.9714,低于全國和全球尺度的其他研究結(jié)果,表明這兩種天然次生林主要受N限制。
[Abstract]:To understand the characteristics of ecological stoichiometry of two natural plants in Ziwuling forest area of Loess Plateau in China. It is helpful to understand the nutrient cycling law and system stability mechanism of natural secondary forest ecosystem in Ziwuling Loess Plateau. The results showed that the average contents of carbon, nitrogen and phosphorus in leaves of Quercus liaotungensis and Bai Hua were 468.6 and 17.1g / kg, and the average contents of carbon, nitrogen and phosphorus in leaves were 457.3 and 12.5g / kg, respectively. The average phosphorus content of leaves was 17.6 ~ 1.4g / kg 路L ~ (-2) respectively) the slope of class II linear regression between the content of N ~ (2 +) P in Bai Hua leaves was greater than that of 1 ~ (-1) P ~ (-) 0. 07%, which indicated that there was a dependence on the proportion of N ~ (+) P elements in the process of leaf formation of Bai Hua. The linear regression slope of class II between leaves of Bai Hua and natural secondary forest was significantly lower than that of 1P 0.05, and the slope of class II linear regression between the total content of NbP in litter leaves of two kinds of natural secondary forest was also significantly lower than that of 1 P 0.05, which reflected the unit P content and single P content in litter leaves of two kinds of natural secondary forests. There was no isokinetic loss relationship between N content at site. (3) there was a significant correlation between leaf nitrogen content and soil nitrogen content in Ziwuling two natural secondary forests on the Loess Plateau, indicating that litter decomposition had an increasing effect on soil nitrogen pool. Compared with the litter leaves, the phosphorus content of plant leaves was closely related to the soil phosphorus content. The higher P content in soil, the higher P content in plant leaves. The soil organic matter of two natural secondary forests in the Ziwuling forest area of the Loess Plateau has a rapid mineralization.) Quercus liaotungensis is the dominant species of vegetation succession to the climax community. The C _ (1) N value of litter leaves was 26.7 which was much lower than that of Bai Hua's leaves (44.9% P _ (0.05)), which was beneficial to the decomposition of litter leaves by microorganisms. The average value of plant leaf N: P of two natural secondary forests is 7.9714, which is lower than that of other studies on national and global scale, indicating that the two natural secondary forests are mainly restricted by N.
【作者單位】： 西北農(nóng)林科技大學(xué)資源環(huán)境學(xué)院;西北農(nóng)林科技大學(xué)黃土高原土壤侵蝕與旱地農(nóng)業(yè)國家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家自然科學(xué)基金面上項(xiàng)目(41671280) 水利部公益性行業(yè)科研專項(xiàng)經(jīng)費(fèi)項(xiàng)目(201501045)
【分類號(hào)】：S714

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