本文關(guān)鍵詞： 刺槐 遼東櫟 油松 土壤 化學(xué)計(jì)量特征 地理因子 氣候因子　出處：《生態(tài)學(xué)報(bào)》2017年02期 　論文類型：期刊論文

【摘要】：以陜西省29個(gè)縣(市)39個(gè)樣點(diǎn)的刺槐、遼東櫟和油松林為研究對象,分析比較不同樹種喬木葉片、凋落物與土壤N、P化學(xué)計(jì)量特征及其與經(jīng)緯度、海拔、年均溫度和年降水等環(huán)境因子間關(guān)系的異同以及三者之間可能存在的關(guān)系,以期為認(rèn)識陜西省主要森林樹種養(yǎng)分限制狀況、制定合理的植被管理和恢復(fù)措施提供理論依據(jù)。結(jié)果表明:3樹種葉片N、P含量及比值均為刺槐遼東櫟油松,與葉片相比,凋落物中N、P含量變化幅度較小,為刺槐遼東櫟油松,N∶P比值為油松遼東櫟刺槐。10—20 cm與0—10 cm土層相比,3樹種中除遼東櫟中P含量差異不顯著外,其它指標(biāo)N、P含量及N∶P比值均顯著下降(P0.05)。刺槐、遼東櫟和油松葉片N、P含量與土壤N、P含量均沒有顯著相關(guān)性,以刺槐、遼東櫟和油松3種植物葉片為總體來說,P含量與土壤P含量顯著正相關(guān)(P0.05)。葉片N、P含量均大致表現(xiàn)出隨著年均溫度和年降水的增加而增加,隨著經(jīng)緯度的增加而降低的趨勢,這一點(diǎn)在刺槐葉中最為明顯。凋落物N含量隨著年均溫度和年降水的增加而增加,隨著緯度和經(jīng)度的增加而降低;P含量隨著年降水和經(jīng)度的增加而降低;N∶P比值隨著年均溫度和年降水的增加而增加,隨著緯度的增加而降低。研究區(qū)內(nèi),土壤N、P含量隨著緯度、海拔的增加和年均溫度、年降水、經(jīng)度的降低而增加,N∶P比值則呈相反的趨勢。3樹種土壤N、P含量及N∶P比值中,P含量比N含量受環(huán)境影響更大,且0—10 cm和10—20 cm土層N、P含量及N∶P比值與各環(huán)境因子的關(guān)系基本一致。
[Abstract]:The tree leaves, litter and soil of tree leaves, litter and soil in 39 samples of Robinia pseudoacacia, Quercus liaotungensis and Pinus tabulaeformis were studied in 29 counties (cities) of Shaanxi Province. The similarities and differences between environmental factors such as average annual temperature and annual precipitation, and the possible relationships among them, in order to understand the nutrient limitation of the main forest tree species in Shaanxi Province, Reasonable vegetation management and restoration measures were made to provide the theoretical basis. The results showed that the content and ratio of N ~ + P in leaves of three species were all Pinus tabulaeformis L., and the change range of N ~ (+) P content in litter was smaller than that in leaves of Pinus pseudoacacia var. liaotungensis. The results showed that the ratio of N to P of Pinus tabulaeformis was the same as that of Pinus tabulaeformis L. in the soil layer of 10 ~ (-20) cm and 0 ~ 10 cm, except for the difference of P content in Quercus liaotungensis, the other indexes, the content of N ~ (+) P and the ratio of N _ (1) to P, decreased significantly (P _ (0.05)). There was no significant correlation between the content of N P in leaves of Quercus liaotungensis and Pinus tabulaeformis and the content of N P in soil, especially Robinia pseudoacacia. The leaves of Quercus liaotungensis and Pinus tabulaeformis were significantly positively correlated with soil P content (P 0.05). The leaf Nu P content generally increased with the increase of average annual temperature and annual precipitation, and decreased with the increase of longitude and latitude. This was most obvious in the leaves of Robinia pseudoacacia. The N content of litter increased with the increase of annual temperature and annual precipitation. With the increase of latitude and longitude, the content of N + P decreases with the increase of annual precipitation and longitude, and the ratio of N: P increases with the increase of annual temperature and annual precipitation, and decreases with the increase of latitude. The increase of elevation, annual temperature, annual precipitation, longitude and the increase of N / P ratio showed the opposite trend. 3 the content of N ~ (+) P in soil of tree species and the ratio of N to P were more affected by the environment than the content of N. The relationship between the content of N ~ (+) P and the ratio of N _ (1) to P in 0-10 cm and 10 ~ (-20) cm soil layers was basically consistent with the environmental factors.
【作者單位】： 西北農(nóng)林科技大學(xué)林學(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;中國科學(xué)院水利部水土保持研究所;
【基金】：國家自然科學(xué)基金資助項(xiàng)目(41201088,41371506) 中國科學(xué)院西部之光資助項(xiàng)目(K301021304);中國科學(xué)院陜西省森林固碳現(xiàn)狀、速率和潛力研究(XDA05050203-05)
【分類號】：S718.4;S714

【參考文獻(xiàn)】

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本文編號：1524099