太白山不同海拔土壤碳、氮、磷含量及生态化学计量特征

发布时间：2018-08-07 21:24

【摘要】：为探究太白山土壤碳(C)、氮(N)、磷(P)含量垂直分布特征,阐明土壤C、N、P生态化学计量学特征对海拔梯度的响应规律,在秦岭太白山1 700~3 500 m区域以100 m海拔间隔进行研究。结果表明:(1)不同海拔高度下土壤有机碳、全氮、全磷变化范围分别是23.56~83.59g kg-1、2.00~5.77 g kg-1、0.32~0.47 g kg-1。土壤有机碳与全氮含量随海拔梯度升高先增后降,土壤全磷含量空间变异较小;(2)土壤C∶N、C∶P、N∶P范围分别为7.17~18.41、60.61~190.4、5.81~12.26。随海拔增加,土壤C∶N在阔叶林带呈降低趋势,针叶林带时转变为增加趋势。土壤C∶P随海拔梯度的变化趋势与土壤C∶N类似,N∶P随海拔梯度增加先升后降,至3 200 m有所升高;(3)两个阔叶林带(辽东栎林带和桦木林带)与高山草甸的土壤C、N含量及生态化学计量比高。冷杉林带C、N含量及其生态化学计量比最小;(4)温度、含水量、海拔和植被对土壤C、N、P化学计量特征具有重要影响,通过冗余分析揭示每个因素分别可解释系统变异信息的25.0%、24.3%、11.1%和6.9%,合计为67.3%。可见这些环境因素直接决定了土壤养分及生态化学计量特征。结果可为探明森林土壤养分供应状况和限制因素及太白山生态系统的保护、森林土壤质量评价等提供基础。
[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.
【作者单位】：西北农林科技大学资源环境学院;农业部西北植物营养与农业环境重点实验室;
【基金】：国家公益性行业(林业)科研专项(201304307) 国家自然科学基金项目(41571245) 西北农林科技大学“基本科研业务费科研创新重点项目”(ZD2013012)共同资助~~
【分类号】：S714

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