【摘要】：為探究太白山土壤碳(C)、氮(N)、磷(P)含量垂直分布特征,闡明土壤C、N、P生態(tài)化學(xué)計量學(xué)特征對海拔梯度的響應(yīng)規(guī)律,在秦嶺太白山1 700~3 500 m區(qū)域以100 m海拔間隔進行研究。結(jié)果表明:(1)不同海拔高度下土壤有機碳、全氮、全磷變化范圍分別是23.56~83.59g kg-1、2.00~5.77 g kg-1、0.32~0.47 g kg-1。土壤有機碳與全氮含量隨海拔梯度升高先增后降,土壤全磷含量空間變異較小;(2)土壤C∶N、C∶P、N∶P范圍分別為7.17~18.41、60.61~190.4、5.81~12.26。隨海拔增加,土壤C∶N在闊葉林帶呈降低趨勢,針葉林帶時轉(zhuǎn)變?yōu)樵黾于厔荨Ｍ寥繡∶P隨海拔梯度的變化趨勢與土壤C∶N類似,N∶P隨海拔梯度增加先升后降,至3 200 m有所升高;(3)兩個闊葉林帶(遼東櫟林帶和樺木林帶)與高山草甸的土壤C、N含量及生態(tài)化學(xué)計量比高。冷杉林帶C、N含量及其生態(tài)化學(xué)計量比最小;(4)溫度、含水量、海拔和植被對土壤C、N、P化學(xué)計量特征具有重要影響,通過冗余分析揭示每個因素分別可解釋系統(tǒng)變異信息的25.0%、24.3%、11.1%和6.9%,合計為67.3%�？梢娺@些環(huán)境因素直接決定了土壤養(yǎng)分及生態(tài)化學(xué)計量特征。結(jié)果可為探明森林土壤養(yǎng)分供應(yīng)狀況和限制因素及太白山生態(tài)系統(tǒng)的保護、森林土壤質(zhì)量評價等提供基礎(chǔ)。
[Abstract]:In order to investigate the vertical distribution of carbon, (C), nitrogen, (N), and phosphorus (P) content in soil of Taibai Mountain, and to elucidate the response of soil C N N P ecochemometrics to the elevation gradient, a 100m altitude interval was studied in the area of 1 700 ~ 3 500 m above sea level in Taibai Mountain, Qinling. The results showed that: (1) the variation range of soil organic carbon, total nitrogen and total phosphorus at different altitude was 23.56 ~ 83.59g / kg ~ (-1) ~ 2.00 ~ 5.77 g / kg ~ (-1) ~ 0.32 ~ 0.47 g / kg ~ (-1), respectively. Soil organic carbon and total nitrogen content increased first and then decreased with the elevation gradient, the spatial variation of soil total phosphorus content was relatively small; (2) the range of soil C: Nu C: P: P was 7.17 ~ 18.41% ~ (66. 61) ~ 190.41 ~ (5.81) ~ (12) ~ (26). With the increase of altitude, soil C _ (1) N decreased in the broadleaved forest zone and changed to an increasing trend in the coniferous forest zone. The variation trend of soil C: P with the elevation gradient was similar to that of soil C: n, which increased at first and then decreased with the increase of the elevation gradient. (3) two broad-leaved forest belts (Liaodong oak forest belt and birch forest belt) and alpine meadow had higher soil C ~ + N content and ecostochemical measurement ratio. (4) temperature, water content, elevation and vegetation have important effects on the soil Con N P stoichiometric characteristics. The redundancy analysis revealed that each factor could explain 25.0% and 6.9% of the variation information of the system respectively, and the total was 67.3%. It can be seen that these environmental factors directly determine the characteristics of soil nutrients and ecological stoichiometry. The results can provide a basis for the study of forest soil nutrient supply and limiting factors, the protection of ecosystem in Taibai Mountain, and the evaluation of forest soil quality.
【作者單位】： 西北農(nóng)林科技大學(xué)資源環(huán)境學(xué)院;農(nóng)業(yè)部西北植物營養(yǎng)與農(nóng)業(yè)環(huán)境重點實驗室;
【基金】：國家公益性行業(yè)(林業(yè))科研專項(201304307) 國家自然科學(xué)基金項目(41571245) 西北農(nóng)林科技大學(xué)“基本科研業(yè)務(wù)費科研創(chuàng)新重點項目”(ZD2013012)共同資助~~
【分類號】：S714

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